GA Series Packaged Terminal Air Conditioner / Heat Pump 7,000 --- 15,000Btuh Service Technician Guide A07228 TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS 2 ........................ GENERAL INFORMATION 2 .......................... UNIT DIS--ASSEMBLY 3--5 ........................... ACCESSING COMPONENTS 6--12 ..................... Accessing Indoor--Air Components 6--8 ............ Accessing Control Components 9--10 .............. Accessing Outdoor--Air Components 11--12 ......... COMPONENT OPERATION 13--24 ..................... 7 1 - - 3 1 r o s s e r p m o C ............................. 9 1 - - 8 1 r e t a e H ................................. 1 2 - - 9 1 s r o t o M n a F ............................. 2 2 s r o t i c a p a C ................................. 3 2 e v l a V n i a r D e t a s n e d n o C ...................... 4 2 r o s n e S l i o C r o o d n I .......................... 4 2 r o s n e S l i o C r o o d t u O ......................... 5 2 r o s n e S e r u t a r e p m e T m o o R .................... PAGE OPERATING CONTROL FUNCTIONS / PROTECTIONS 25--27 ................................ CONFIGURATION 27--28 ............................. 8 2 s e h c t i w s p i D ................................ 9 2 n o i t a r u g i f n o C d a p y e K ....................... WALL THERMOSTAT INTERFACE 30--32 .............. ENERGY MANAGEMENT INPUT 33 .................. CONTROL DIAGNOSTICS 33 ......................... TYPICAL WIRING SCHEMATIC 34 .................... TROUBLESHOOTING 35 ............................. CARE AND CLEANING 36--38 ........................ APPENDIX 39--40 ....................................
Transcript
GA SeriesPackaged Terminal Air Conditioner / Heat Pump7,000 --- 15,000 Btuh
SAFETY CONSIDERATIONSRecognize safety information. This is the safety--alertsymbol . When you see this symbol on the unit andin instructions or manuals, be alert to the potential forpersonal injury.Understand these signal words: DANGER,WARNING, and CAUTION. These words are usedwith the safety--alert symbol. DANGER identifies themost serious hazards which will result in severepersonal injury ordeath. WARNINGsignifieshazardswhich could result in personal injury or death.CAUTION is used to identify unsafe practices whichmay result in minor personal injury or product andproperty damage. NOTE is used to highlightsuggestions which will result in enhancedinstallation, reliability, or operation.
PERSONAL INJURY AND/OR PROPERTY DAMAGEHAZARD
Failure to follow this warning could result in personal injury,death and/or property damage.For your safety, the information in this manual must befollowed to minimize the risk of fire or explosion, electricshock, or to prevent property damage, personal injury, or lossof life.
• This unit must be properly installed in accordancewith the Installation Instructions before it is used.
• Immediately repair or replace all electric servicecords that have become frayed or otherwisedamaged.
• Unplug or disconnect the unit at the fuse box orcircuit breaker before making any repairs.
! WARNING
NOTE: We strongly recommend that any servicingbe performed by a qualified individual.
GENERALThe focus of this manual is to provide basicinformation on service procedures, safety,troubleshooting, cleaning, and componentreplacement for service technicians.It is intended for use only by HVAC servicetechnicians who have successfully completedinstruction and received Type I Certification from theU.S. Environmental Protection Agency. Theinstructions in this manual are general in nature andare not to be substituted for installation and serviceinstructions shipped with the unit. No attempt toinstall, operate, adjust, repair, or dismantle anyequipment should be made until the manufacturer’sinstructions are read and thoroughly understood bythe service technician. Even equipment that seemsfamiliar may have specific model differences fromyear to year. Always review manufacturer’sinstructions.Gree GA series packaged terminal air conditioner(PTAC) and heat pump units are self--contained forinstallation through the wall for individual roomheating and cooling. The PTAC polymer and metalsleeves are permanently fastened to the wall; the unitchassis slides out of the sleeve to allow the servicetechnician easy access. Many accessories are offeredto complement the unit’s performance and comfortcontrol.Before beginning any service procedure, it isimportant to check the unit model number. SeeFigure 1 and 2. Units that seem similar may havesubtledifferences thatcouldaffect serviceprocedures.The following units are covered in this manual:GAE — 60 Hz cooling with electric heat unitsGAA — 60 Hz heat pump with electric heat unitsKnowing which model is being serviced will helpdetermine if the unit is performing at optimum levels.The model number is located on the data informationplate behind the front panel of the unit. See Figure 1.The data information plate also lists voltage rangesand other important electrical information about theunit.
63229919466Warning: Use on Single Outlet Circuit Only
PACKAGED TERMINAL AIR CONDITIONERAlso Verified In Accordance With Energy Standards DOE Test Procedure 10 CFR,Part 430,App.F,Issued 01/01 and CAN/CSA-C368.1-M90
EnergyPerformanceRendementEnergetiqueGREE ELECTRIC APPLIANCES
INC. OF ZHUHAI
SERIAL: 3504Z88741
EER 10.7 COP 3.1 R410A 35.98 OZ. MFG.DATE
BTU/HR 10700AMPS 4.5WATTS 1010
HEATING
3
UNIT DIS--ASSEMBLYThis section includes common procedures for dis--assembly and re--assembly of unit.IMPORTANT: Follow manufacturer’s instructions when disassembling and reassembling a unit forcleaning, maintenance, or part replacement. When disassembling wiring, it is strongly recommended thatnumbered stickers be attached to identify leads and terminals to aid in the re--assembly process. Alwaysreview safety procedures prior to the start of a job.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Prior to servicing electrical equipment, disconnect all powerto avoid electric shock.Tag all disconnects.Never alter cord or plug and DO NOT use extension cords.
! WARNINGTOOLS NEEDEDThefollowing field--supplied items are recommendedfor general dis--assembly of the unit:
• Phillips--head screw driver• 10 mm open wrench• Safety glasses
None – Standard ProtectionCP – Corrosion Protection
A08385
ACCESSORY POWER CORD (REQUIRED) CATALOG NUMBER
A07636
Amperage 15A = 15 Amps20A = 20 Amps30A = 30 Amps
PWRCORD – 230v
Kit DescriptionPWRCORD = Power Cord
Voltage
– 20A
230v = 208/230-v, 60 Hz 265v = 265-v, 60 Hz
A07637
*Power Cord for 208/230v*
*Power Cord for 265v
AB - Major & Minor Revsions
Fig. 2 – Catalog Number Nomenclature
4
A. Remove Front Panel1. Grasp the front panel firmly at the center of the
top and bottom of the panel.2. Remove the front panel by pulling it out at the
bottom to release it, then lift up to clear the railalong the unit top. See Fig. 3.
A07064
Fig. 3 – Removal of Front Panel
B. Disconnect Power for Cord--Connected Unit
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Disconnect all power to unit to avoid possible electricalshock during service or installation.
! WARNING
1. Use power button on keypad or wall thermostatto turn unit OFF.
2. Open the disconnect switch at main powersupply. Use proper lockout and tag procedures.
3. Unplug the unit service cord.
DISCONNECT POWER FORPERMANENTLY CONNECTED(HARDWIRED) UNITS
1. Use power button on keypad or wall thermostatto turn unit OFF.
2. Open the disconnect switch at main powersupply.
3. Remove junction box cover by removing threescrews from front. Remove junction box bytaking out top, rear and side screws. See Fig. 4
4. Pull out the plug assembly and disconnect. SeeFig. 5.
Unit connector
Junction box cover Junction box
A07058
Fig. 4 – Removal of Junction Box Cover
TERMINALBLOCK
POWERCORD
BASEPAN
POWERCORDRECEPTACLE
A07059
Fig. 5 – Plug Assembly on Hardwire Units
5
C. Remove Unit From The Wall Sleeve1. Remove the four mounting screws that secure
the PTAC unit to the wall sleeve (2 screws perside). See Fig. 6 and Fig. 7.
2. Grasp sides of unit and slide it from the sleeve.
PERSONAL INJURY HAZARDFailure to follow this warning could result in personal injuryor death.Chassis weighs up to 150 pounds (68.0 kg). Seek help whenlifting unit.Lift unit by holding unit basepan. The basepan may containwater. Tilt the unit back slightly when removing it from thesleeve to drain some of the water into the sleeve.
! WARNINGGE WALLSLEEVEHOLES
AMANA, TRANE(SLOTTEDHOLES) WALLSLEEVE HOLES
VARIOUS ATTACHMENTHOLE LOCATIONS
GREE, CARRIER ANDBRYANT WALL SLEEVEHOLES
A08516
Fig. 6 – PTAC Unit to Wall Sleeve Mounting Screws
A07057
Fig. 7 – Location of Wall Sleeve Screws
6
ACCESSING COMPONENTS
ACCESSING INDOOR--AIR COMPONENTS
Remove the Gussets1. Remove the 2 screws on each side that secure
the gussets to the partition.2. Remove the 2 screws that secure the gussets to
the outdoor fan shroud. See Fig. 8.3. Lift gussets from the unit.
SCREW SCREW
SCREW SCREW
GUSSET
GUSSET
A08521
Fig. 8 – Location of Gusset Screws
Remove the Top Plate1. Locate 7 screws that secure top plate to partition
and remove. See Fig. 9.2. Once all 7 screws have been removed, lift the
top plate up and away from the unit. See Fig.10.
Removal of Discharge Screen1. Once the top plate has been removed, locate and
remove 3 screws that secure discharge screen tofan assembly. See Fig. 9.
2. After the screws have been removed, thedischarge screen can be lifted from the unit.
SCREW(NOT SHOWN)
DISCHARGESCREEN SCREWS
SCREW
SCREW
SCREW
SCREW
A08522
Fig. 9 – Removal of Screws from Top Plate
TOP PLATE
A08523
Fig. 10 – Removing Top Plate from Unit
Removal of Controls KeypadThe controls keypad must be removed to gain accessto 2 screws that secure the electrical box to thepartition.
1. Locate and remove the screw that attachescontrols keypad to electrical box and remove.See Fig. 11.
2. Push keypad toward partition to release fromplastic tabs underneath, then lift up to removekeypad.
Keypad ScrewLocation
A08549
Fig. 11 – Keypad Screw Location
7
Remove Electrical Box1. Locate and remove the 5 screws that fix the
electrical box to the rest of the unit. See Fig.12.
2. At this point, the heater limits (black), electricheat (large white), and indoor fan motor (smallwhite) plugs need to be disconnected. See Fig.13.
3. To remove the electrical box, firmly grasp andlift box up and away from the 2 tabs locatedbehind the box.
SCREW
SCREW
SCREW
SCREW
SCREW
A08524
Fig. 12 – Remove 5 Screws from Electrical Box
INDOOR FAN PLUG ELECTRIC HEAT PLUG HEATER LIMIT PLUG
A08525
Fig. 13 – Heater Limits, Electric Heat, and Indoor Fan MotorPlugs
Removing Indoor Fan/ Electric Heat AssemblyOnce the top plate and electrical box have beenremoved, the indoor fan/ electric heat assembly isaccessible.
1. Locate and remove the screws that secure theassembly to the partition. There are 2 screwslocated on the fan motor side and 2 screwslocated on the opposite side. See Fig. 14 andFig. 15.
2. There are a total of 5 screws that secure theindoor fan/electric heat assembly to the indoorcoil that must be removed. 2 screws (one oneach side) are located at the top of the coil. Theremaining screws are found along the sides ofthe coil. 1 screw will be on the fan motor side,and the other 2 at the opposite end. See Fig. 14and Fig. 15.
3. Once all screws have been removed, separatethe assembly from the partition to release it. SeeFig. 16.
4. The assembly can then be lifted up and awayfrom the unit for removal.
PARTITION SCREW
TOP OF COIL SCREW
SIDE OF COIL SCREW
INDOOR FANMOTOR
PARTITION SCREW
HEAT ASSEMBLY
A08526
Fig. 14 – Location of Fan Assy. Screws on Fan Motor Side
PARTITIONSCREW
TOP OF COIL SCREW
SIDE OF COIL SCREW
PARTITIONSCREW
SIDE OF COIL SCREW
A08527
Fig. 15 – Location of Fan Assembly Screws on Opposite Side
8
INDOOR FAN ASSEMBLY
PARTITION
A08528
Fig. 16 – Separate Indoor Fan Assembly from Partition
Accessing Electric Heat Assembly1. Once the indoor fan assembly has been
removed, the electric heat assembly isaccessible.
2. To detach heat assembly from indoor fanassembly, locate and remove 3 screws on eachend of heat assembly. See Fig. 17 and Fig. 18.
ELECTRIC HEATASSEMBLY
SCREW
SCREW
SCREW
INDOOR FANMOTOR
A08529
Fig. 17 – Location of Heater Assembly Screws(Fan Motor Side)
OUTDOOR COIL
DRAIN VALVE
BASEPAN
HEATERASSEMBLYSCREWS
A08545
Fig. 18 – Location of Heater Assembly Screws(Opposite Side)
9
ACCESSING CONTROL COMPONENTS
Removal of Controls KeypadThe controls keypad must be removed to accessunit--mounted interaface and display board. Thecontrols keypad should also be removed if additionalroom is required to access components in the controlbox.
1. Locate and remove the screw that attaches thecontrols keypad to the electrical box. (See Fig.19.)
2. Push keypad toward partition to release fromplastic tabs underneath, then lift up to removekeypad.
Keypad ScrewLocation
A08549
Fig. 19 – Keypad Screw Location
Accessing Control Box Wiring, Capacitors or toCheck VoltagesTo remove the side cover for access to control box:
1. Remove nine (9) screws as shown in Fig. 20from side cover. Fig. 21 shows the side coverremoved.
A09311
Fig. 20 – Screw Location
A09312
Fig. 21 – Side Cover RemovedThe control components will be accessible when thepanel has been removed. The control componentlayout is shown in Fig. 22.
LOGIC BOARD(PCB2)
RELAY BOARD(PCB1)
OUTDOOR FANCAPACITOR
INDOOR FAN CAPACITOR
PLUG CONNECTOR
COMPRESSORCAPACITOR
JUNCTION BOX
A09324
Fig. 22 – Location of Components Inside Control Box
10
Access or Remove Control BoardsRemove the control box side--access cover as shownin previous section.To remove the front control box cover:
1. Remove the two (2) screws that hold the bottomcover in place as shown in Fig. 23.
2. Remove cover. See Fig. 24.3. Remove the five (5) remaining screws from the
front cover as shown in Fig. 25.4. Remove two (2) additional screws that hold the
control board to the control box as shown inFig. 26.
A09313
Fig. 23 – Location of Control Box Cover Screws
A09314
Fig. 24 – Control Box Cover Removed
A09315
Fig. 25 – Screw Location in Front Cover
A09316
Fig. 26 – Location of Screws Holding Control Board toControl Box
5. Gently pull the front cover of control box awayfrom the bottom. See Fig. 27 and Fig. 28.
A09317
Fig. 27 – Pull Control Box Away From Bottom
A09318
Fig. 28 – Control Box Pulled Away From Bottom
11
ACCESSING OUTDOOR--AIR COMPONENTS
Remove GussetsRefer to Remove Gussets section in AccessingIndoor--Air Section Components (page 6).
Remove Upper Condenser Shroud1. Locate and remove 2 screws that join condenser
shroud to outdoor coil. Also remove 2 screwsthat attach condenser shroud to fan bracket. SeeFig. 29.
2. Locate and remove the 4 connecting screws (2on each side) located on the rear of the shroud.See Fig. 30
3. Once the 4 connecting screws have beenremoved, push the shroud away from the fanmotor. See Fig. 31.
4. With upper shroud separated from the fan motorbracket, grasp the shroud and remove it fromthe unit. See Fig. 32.
SCREW
UPPER CONDENSERSHROUD
FAN BRACKET
SCREW
SCREW
SCREW
A08531
Fig. 29 – Location of Attachment Screws on Top of CondenserShroud
UPPER CONDENSER SHROUD
OUTDOOR FAN MOTOR BRACKET
SCREW
SCREW
SCREWSCREW
A08532
Fig. 30 – Location of Screws Connecting Shroud
UPPER CONDENSER SHROUD
OUTDOOR FANMOTOR BRACKET
A08533
Fig. 31 – Push Condenser Shroud from Fan Motor Bracket
UPPER CONDENSER SHROUD
SLINGER RING OUTDOORFAN
A08534
Fig. 32 – Removal of Upper Condenser Shroud
12
Remove the Outdoor Fan AssemblyWith the upper condenser shroud removed, theoutdoor fan assembly can be removed.
1. Locate and remove 2 screws that attach fanmotor bracket to base of unit. See Fig. 33.
2. Lift outdoor fan assembly out of unit.3. To remove fan from assembly, use 10 mm open
wrench to loosen nut on motor shaft. See Fig.34
a. Pull outdoor fan off fan motor shaft.
OUTDOOR MOTOR BRACKET
OUTDOOR FAN MOTOR
SCREW
SCREW
BASEPANOUTDOOR FAN
SLINGER RING
A08535
Fig. 33 – Location of Fan Motor Bracket Screws
OUTDOOR FAN MOTOR
OUTDOOR FAN
10MM NUT
10MM OPEN WRENCH
A08536
Fig. 34 – Remove 10 mm Nut on Fan Motor Shaft
Removal of Lower Condenser ShroudFor cleaning purposes, the lower condenser shroudmay need to be removed from the unit to provideaccess to the outdoor coil.
1. Verify the upper condenser shroud and outdoorfan assembly have been removed. If necessary,refer to previous sections.
2. Locate and remove 2 screws (1 on each side)that fasten lower condenser shroud to outdoorcoil. See Fig. 35 and Fig. 36.
3. The lower condenser shroud can now beseparated from the coil and taken out of theunit.
COPRESSORSOUND SHIELD
CAPILLARY TUBE
OUTDOOR COILTEMPERATURE SENSOR
SCREW
LOWER CONDENSOR SHROUD
OUTDOOR COIL
A08537
Fig. 35 – Location of Shroud to Coil Screw(Compressor Side)
A08550
Fig. 36 – Location of Shroud to Coil Screw(Vent Door Side)
13
COMPONENT OPERATION
COMPRESSORA cutaway view of the rotary compressor with keycomponents labeled is shown in Fig. 37. The motorstator is rigidly attached to the compressor shell. Therotor is pressed onto the eccentric shaft, which issupported by 2 bearings. Both the discharge valveand discharge muffler are attached to the motorbearing. The pump bearing provides a thrust surface
for the shaft and the rolling piston. Compressed gas isseparated from the suction gas by the vane. Dischargegas pressure and the vane spring keep the vane incontact with the rolling piston.NOTE: The compressor sound shield is secured byVelcro and should be removed before servicing thecompressor.
DISCHARGE MUFFLER
DISCHARGE VALVECYLINDER
PISTON
SUCTION MUFFLER/ACCUMULATOR
SUCTION INLET
DISCHARGE TUBE
VANE
OIL TUBE
SHELL
STATOR
ECCENTRIC SHAFT
ROTOR
MOTOR BEARING
PUMP BEARING
MOUNTING PLATE
A08557
Fig. 37 – Rotary Compressor Components
14
The rotary compression process (see Fig. 38), starts attop dead center as shown in (1). Suction gas flowsthrough the suction inlet and into the cylinder area.As the shaft rotates through 90 degrees, the rollingpiston moves to position A as shown in (2). Thesuction volume is now the area defined by point Aand the tip of the vane. Gas in the remaining volumehas been compressed above suction pressure. Afteranother 90 degrees of shaft rotation, the rolling pistonhas moved to position B as shown in (3). Both thecompressed gas and suction gas volumes are nowequal. Another 90 degrees of shaft rotation is shownin (4). Compressed gas has reached a pressuresufficient to open the discharge valve, and flows fromthe cylinder into the compressor shell. After another90 degrees of shaft rotation, the entire process beginsagain. Continuous suction and discharge allows for asmooth compression process.The rolling piston is not in actual contact with thecylinder wall, vane, or bearing faces. Hydrodynamicsealing prevents leakage from the compressed gasvolume to the suction volume via these paths. Precisecontrol of machining tolerances, surfaces, finishes,and assembly clearances is critical to achieve highefficiency performance. In addition, the line contact
between the vane tip and the rolling piston requirescareful selection and control of materials to providewear resistance and reliable long--term operation.
A08558
Fig. 38 – Rotary Compressor Compression Process
COMPRESSOR TROUBLESHOOTINGRefer to the Compressor Troubleshooting Tablebelow for a basic compressor troubleshooting guide.
COMPRESSOR TROUBLESHOOTING GUIDE
POSSIBLE CAUSE
SYMPTOM
CompressorStarts and RunsBut Cycles Onthe Overload
CompressorStarts AfterCycling theOverload
Several Times
Compressor WillNot Start. ItHums and
Cycles On theOverload
Compressor WillNot Start and
Makes No Noise
CompressorCycles Off
(Not On Over-load)
CHECK UNIT STATUS INDICATOR FOR ADIAGNOSTIC CODE (See Control Dia-gnostics section of this manual)
X X
UNIT MAY BE IN A RANDOM 3---MINUTETIMEGUARD X X
COILS/FILTERS DIRTY OR PLUGGED XAIR OR NON---CONDENSABLE GASES INSYSTEM X X
SYSTEM REFRIGERANT OVERCHARGED X XDISCHARGE LINE RESTRICTED X XCAPILLARY TUBE OR STRAINERRESTRICTED OR PLUGGED X X X
FAN BLADE OR MOTOR DEFECTIVE X XFAN BLADE OR BLOWER WHEEL STUCK X XSYSTEM REFRIGERANT UNDERCHARGED X XEVAPORATOR AIRFLOW RECIRCULATION XUNIT OVERSIZED FOR APPLICATION XCOMPRESSOR REQUIRES START ASSIST X XNO POWER TO UNIT XLOW VOLTAGE TO UNIT X X X XOVERLOAD PROTECTOR OPEN XOVERLOAD PROTECTOR INCORRECT ORDEFECTIVE X X X
CAPACITOR INCORRECT OR DEFECTIVE X X X XTHERMOSTAT IS SET TOO HIGH OR LOW XWIRING IS INCORRECT OR DEFECTIVE X X X XSYSTEM PRESSURES NOT EQUALIZED X X XCOMPRESSOR MOTOR OR MECHANISMDEFECTIVE X X X X X
COMPRESSOR GROUNDED X
Note: In order to aid in compressor operation troubleshooting, disable control delays and timers for one cycle by depressing the temp up and temp down . . .keys at the same time (hold for 3 seconds). The delays and timers will be enabled after the cycle has completed or if power is cycled.. . .
15
BASIC HERMETIC COMPRESSORELECTRICAL MEASUREMENTSThere are 2 basic electrical tests for hermeticcompressors that will determine the electrical state ofthe motor. The first test requires checking theelectrical resistance of each of the electrical motorwindings. The second test requires checking theelectrical resistance of each of the electrical motorwindings to ground. These tests may be accomplishedby performing the following steps:
1. DISCONNECT ALL POWER TO THEUNIT.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Disconnect all power to unit to avoid possible electricalshock during service or installation.
! WARNING
2. Remove the unit chassis from the sleeve asdetailed in the Unit Dis--assembly section.
3. Open the control box as detailed in theAccessing Components section then locate,label, and remove the three (3) compressorwires from the following locations: the RUNwire (blue) from the capacitor, the START wire(yellow) from the capacitor. The third wire,COMMON wire (red), will be connected to theterminal block.
PERSONAL INJURY OR DEATH HAZARDFailure to follow this warning could result in personal injuryor death.For compressors that are known to be damaged:Remove refrigerant prior to disconnecting compressor wires.Damaged hermetic compressor terminals may become looseand eject from the compressor. Wear safety glasses and keepyour face away from the area above the terminals whenremoving compressor wires.
! DANGER
4. Perform a shorted/open windings test tomeasure the resistance between the windings ofthe compressor motor. Use a volt--ohmmeterset to the lowest ohm reading level then readand record the resistance between the RUN andSTART, START and COMMON, and RUN andCOMMON wires. See Fig. 39. The typicalresistance readings will be about 4, 3, and 1ohms respectively. The smaller values shouldadd to equal the larger value. If this is not truethen the compressor is likely shorted winding towinding.
NOTE: The rotary compressor has the compressoroverload located under the terminal cover. If theoverload is open it can show ohm readings that areinfinite. The unit should be off for at least an hour togive this overload time to reset if it is open.
5. Next, perform a grounded windings test to testthe resistance individually of each wire to theshell of the compressor. The paint on thecompressor can prevent good contact betweenthe probe and the metal. The paint should beremoved from a small section of the shell of thecompressor to ensure good contact by the meterprobe. The volt--ohmmeter should be set to atleast the 100X ohm level. The measuredresistance between each wire and ground shouldbe infinite or O.L. on the readout. If there ismeasurable resistance one of the windings islikely shorted to ground. See Fig. 40.
6. A compressor that has a winding to windingshort or a winding to compressor shell short iselectrically failed and needs to be replaced. Seethe Compressor Replacement section for details.
A08559
Fig. 39 – Shorted/Open Windings Test
A08560
Fig. 40 – Grounded Windings Test
16
COMPRESSOR REPLACEMENTBefore working on the compressor, read theinstructions thoroughly and gather the necessary toolsfor the job. Review all safety information on unit andin literature. Always turn off all power to unit toavoid the possibility of electrical shock.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Disconnect all power to unit to avoid possible electricalshock during service or installation.
! WARNING
Consider the following safety issues beforebeginning:
• New and unfamiliar tasks should beperformed under the supervision of anexperienced service technician.
• Personal protective equipment, such as workgloves and safety glasses, should be worn.
• The floor around the work area should beclean and free of debris.
• Make sure tools are the correct tools for thejob and that they are working properly and ingood condition.
• Never replace a blown fuse withoutcorrecting the cause of the original failure. Ifthermally operated circuit breakers oroverloads are tripping, make sure the trip isnot due to excessively high temperatures orloose connections.
• When brazing suction and discharge lines,cool the lines with a damp, clean cloth toprevent injury.
• Oil may be present in the compressoraccumulator and interconnecting tubing. Usecaution when removing tubing.
PERSONAL INJURY OR DEATH HAZARDFailure to follow this warning could result in personal injuryor death.For compressors that are known to be damaged:Remove refrigerant prior to disconnecting compressor wires.Damaged hermetic compressor terminals may become looseand eject from the compressor. Wear safety glasses and keepyour face away from the area above the terminals whenremoving compressor wires.
! DANGER
Tools NeededThe following list includes the recommended toolsand devices for removing and replacing thecompressor.
1/2--- in. and 3/8--- in. Tube Benders1/2--- in. Nut Driver5/16--- in. Nut DriverFlat Head ScrewdriverPiercing ValveTop Tech Access Valve (Part No. TT-AVX2 )Pinch Off ToolTop Tech Filter Drier -All Units (Part No. T-LLDBF083S)Refrigerant Acidic Test KitRefrigerant Reclaim SystemCharging Cylinder or an Electronic ScaleR410A RefrigerantTubing CutterTorchNitrogen Cylinder with RegulatorStrainersCapillary Tubes
Removing the CompressorFollow the steps below to remove the compressor:
1. Disconnect all power to unit.2. Remove unit from wall sleeve as detailed in the
Unit Dis--assembly section. The unit weighs upto 150 pounds (68 kg). Seek assistance or use alifting device when removing unit from wallsleeve.
3. If the unit is a heat pump: Disconnect thewire plug on the reversing valve solenoid andcarefully remove the outdoor coil temperaturesensor. See Fig. 41.
4.
ENVIRONMENTAL HAZARDFailure to follow this caution may result in environmentalpollution.Remove and recycle all components (i.e. oil, refrigerant,etc.) before unit final disposal.
CAUTION!
5. When all the refrigerant has been recovered,remove the terminal cover from the compressorwith a nut driver. Disconnect the 3 wires fromthe compressor and label the location of each.Once the wires are labeled, replace the terminalcover to protect the compressor terminals.
6. Remove the air system components byfollowing the procedure detailed in theAccessing Unit Components section.
Attach the piercing valve to the suction side process tube below the crimps. Use a refrigerant acidic tester to verify acidity of the system. After verifying the system acidity, remove the refriger-ant using a certified refrigerant recovery system.
17
7. Remove the piercing valve and cut the crimpedportion of both process tubes off with a smalltubing cutter. Braze an access valve on eachprocess tube. Using a torch, disconnect thesuction and discharge tubes from thecompressor connections.
8. Remove the compressor mounting bolts, andremove the compressor.
PERSONAL INJURY HAZARDFailure to follow this caution may result in personal injury.The compressor may still be hot from brazing process.
CAUTION!
IMPORTANT: Any time the compressor isreplaced, the strainer and capillary tubes must beremoved and replaced also.
9. For all units: Remove and replace the strainerand capillary tubes from the system. See Fig. 41for strainer and capillary tube location.
10. For Heat/Cool Units: Use an in--line filter drier(Part No. T-LLDBF083S). The filter drier can beinstalled in any location in suction line. See Fig.42 for general installation location.For Heat Pump Units: Use an in--line filterdrier (Part No. T-LLDBF083S) and install betweenthe reversing valve and the compressoraccumulator. There are several suction tubeconfigurations and the in--line filter drier will befield piped and brazed into the suction tube foryour unit.
11. Remove the grommets from the existingcompressor and install them onto the newcompressor.
12. Install the new compressor and the newcapillary assembly.
IMPORTANT: Any time the compressor isreplaced, the strainer and capillary tubes mustalso be removed and replaced. An in--line filterdrier must also be added. See Fig. 42 for location.
13. Leak check the unit with 150 psi (10.55kg/cm2)of nitrogen pressure.
14. The refrigeration system should be evacuatedfrom the high side to the low side to a minimumof 200 microns of mercury. This evacuationremoves residual moisture from the systemprior to charging.
15. Recharge unit to the nameplate refrigerantcharge using a charging cylinder or scale.
16. Pinch off each access valve on the process tubesin 2 places using a pinch off tool. Release anyrefrigerant pressure trapped in the access valveby depressing the valve core, then confirm thatno R410A is leaking past the pinch off toollocation. Cut the access valve stem of theprocess tube above the top crimp and braze thetop of each process tube to ensure the system issealed (leave the pinch off tool in place untilafter the brazing process is complete).
17. Reassemble the unit.18. Re--install compressor sound shield.19. Connect the compressor wires and energize the
unit to verify operation.
REVERSING VALVE SOLENOID
OUTDOOR COIL
OUTDOOR COILTEMPERATURESENSOR
CAPILLARY TUBE
COMPRESSORSOUND SHIELD
COMPRESSOR
REVERSING VALVE
A08539
Fig. 41 – Reversing Valve Solenoidand Outdoor Temperature Sensor
IN-LINE FILTER DRIER
SUCTION LINE
COMPRESSOR
CAPILLARY TUBE
OUTDOOR COIL
OUTDOORCOIL SENSOR
A08540
Fig. 42 – In--line Filter Drier general Installation Location
Refrigerant ChargingEvery mechanical refrigeration system that is openedfor servicing must be accurately charged before it isreturned to service. Run the compressor ONLY aftercharging the system with refrigerant.IMPORTANT: The compressor should never beoperated without refrigerant!It is important to remember that recovered and/orrecycled refrigerant may only be recharged into thesystem from which it was initially recovered, oranother one owned by the same customer. Chargelevel is important. Charge units only as recommendedby manufacturer.
18
HEATERS
For example, a 3.0 kW heater may have a primarylimit switch setting of 140˚ F (60˚ C). If thetemperature at the switch exceeds 140˚ F (60˚ C), theprimary limit switch will electrically open and shutoff power to the heater. Once the temperature dropsbelow 110˚ F (43˚ C), the primary limit switch willautomatically reset.The secondary limit switch works in the same manneras the primary limit switch, except it is a one timeswitch and has a slightly higher temperature settingof 178˚ F (81˚ C). Once this switch is thermallyopened, it must be replaced. Together, the primaryand secondary switches help maintain safetemperature limits for unit operation.
SECONDARY LIMIT (REAR) PRIMARY LIMIT (REAR)
HEATERS
A08541
Fig. 43 – Limit Switch Location
COMMON CAUSES OF HEATER FAILUREHeater failure may result from broken heater coils,primary limit switch failure, or an open secondarylimit switch. These conditions are generally causedby low or no airflow or failed electronic board.
HEATER REMOVALBefore working on the heater, read the instructionsthoroughly and gather the necessary tools for the job.Review all safety information on the unit and in theproduct literature.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Disconnect all power to unit to avoid possible electricalshock during service or installation.
! WARNING
The manufacturer reserves the right to discontinue, orchange at any time, specifications or designs withoutnotice and without incurring obligations.Consider the following safety issues:
• Disconnect All Power to unit prior toperforming any service or maintenance.
• New and unfamiliar tasks should beperformed under the supervision of anexperienced service technician.
• Personal protective equipment, such as safetyglasses and work gloves, should be worn.
• The floor around the work area should beclean and free of debris.
• Make sure tools are the correct tools for thejob, and that they are working properly and ingood condition.
Tools NeededThe following list includes the recommended toolsand devices for removing and replacing thecompressor.
Phillips Head Screw DriverVolt---ohmmeter
Perform the following steps to remove the HeaterAssembly.
1. DISCONNECT ALL POWER TO UNIT.2. Remove heater by following instructions in
Accessing Unit Components section.
The heater in Gree GA series PTACs is located directly behind the evaporator coil. The heater assem-bly includes the universal heater (which can be config-ured for 2.0kW, 3.0kW or 5.0kW), a primary limit switch, and a secondary limit switch. See Fig. 43. The primary and secondary limit switches are safety switches that regulate heater operation. The primary limit switch disables current to the heater when the temperature exceeds the setting on the switch.
19
After the heater is removed, examine the heater asfollows to determine if it is operational:Perform a visual inspection. The heater coil should befree of breaks. If there are any breaks in the coil,replacement of the heater assembly is necessary.
PRIMARY LIMIT SECONDARY LIMIT
HEATER ASSEMBLY
3kW ElementConnections
2kW ElementConnections
A09319
Fig. 44 – Heater Coil (Removed)
Coil resistance must also be checked to verify theheater is operating correctly. The resistance of theheater coils must meet approximate levels for theheater to perform at its optimum efficiency. SeeAcceptable Heater Resistance Values table forapproximate resistance for heaters at 75˚ F (24˚ C).Before checking the heater coil resistance, be sure allpower to unit is off.To check resistance, set the volt--ohmmeter selectorswitch to the proper ohm range setting. Connect thevolt--ohmmeter leads to the metal studs on each sideof the heater coil at the element connections that holdthe incoming wires in place. Incorrect readings canbe obtained if the heater connecting plug is notremoved from connector located on the control box(see figure 14). If the resistive reading is infinite orzero, the heater is failed and replacement is necessary.NOTE: If the application is using a 30 amp powercord / 5 kW heater, the 2kW and 3kW heaters areoperated in parallel. The resistance values for theindividual 2kW and 3kW elements should bemeasured and compared to the values provided in thetable
FAN MOTOR TROUBLESHOOTINGRefer to the Fan Motor Troubleshooting table for abasic troubleshooting chart.Tools NeededThe following list includes the recommended toolsand devices for working on the fan motor.
GlovesSafety Glasses
Small Adjustable WrenchPhillips Head Screwdriver
Volt---ohmmeter
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Before cleaning, servicing, performing maintenance, orremoving the chassis from the wall sleeve, disconnect allpower to the unit.Only trained and qualified service personnel should performinstallation and service procedures on these units. Untrainedpersonnel may perform basic maintenance tasks such ascleaning and replacing filters. Refer to Accessing UnitComponents section of this manual for proper procedures todisconnect power to units.
! WARNING
BASIC FAN MOTOR ELECTRICAL TESTSThere are two basic electrical tests for fan motors thatwill determine the electrical state of the motor. Thefirst test requires checking the electrical resistancebetween the motor windings. The second testrequires checkingtheelectrical resistancebetweenthemotor windings and ground. These tests may beaccomplished by performing the following steps:
Outdoor Fan Motor1. DISCONNECT ALL POWER TO UNIT.2. Open the control box as detailed in the UNIT
DIS--ASSEMBLY section.3. Label and disconnect the fan motor wires from
the circuit board and outdoor fan capacitor. SeeFig. 48.
NOTE: The outdoor fan motor has 2 wires that run tothe outdoor fan capacitor and 2 wires that run to thecircuit board.
4. Measure and record the resistance between theblack wire and each of the other wires. Makesure the motor is cool before attempting tomeasure resistance. The internal thermostat ofthe motor may be electrically open and will notclose until the motor cools. See typical motorwinding resistance measurements in OutdoorFan Motor Information table on the followingpage. The resistance values in the table are
The Gree GA series PTAC has an indoor and an outdoor fan, each with their own motor. The indoor fan motor can operate at 3 speeds: High, Medium, and Low. Each motor has it’s own capacitor located inside the control box. the indoor fan capacitor is gray in color and the outdoor fan capacitor is black.
20
approximate. Values that are within 10% ofthose listed are acceptable. If the motor in yourmodel is not listed, find a motor of similarhorsepower and voltage on the chart andcompare it to the resistance measurements ofyour motor.
5. Measure the resistance of each of the motorwires to the motor casing. The resistance shouldbe infinite. Make sure the motor is cool beforeattempting to measure resistance. The internalthermostat of the motor may be electricallyopen and will not close until the motor cools. Amotor that has measurable resistance to groundis shorted to ground and must be replaced.
Indoor Fan Motor1. DISCONNECT ALL POWER TO UNIT.2. Open the control box as detailed in the UNIT
DIS--ASSEMBLY section.3. Unplug indoor fan harness from side of control
box. See Fig. 13.NOTE: The indoor fan motor has 3 wires that run tothe indoor fan capacitor and 3 wires that run to thecircuit board.
4. Measure and record the resistance between theblack wire and each of the other wires. Makesure the motor is cool before attempting tomeasure resistance. The internal thermostat ofthe motor may be electrically open and will notclose until the motor cools. See typical motorwinding resistance measurements in thefollowing Indoor Fan Motor Information table.The resistance values in the table areapproximate. Values that are within 10% ofthose listed are acceptable. If the motor in yourmodel is not listed, find a motor of similarhorsepower and voltage on the chart andcompare it to the resistance measurements ofyour motor.
5. Measure the resistance of each of the motorwires to the motor casing. The resistance shouldbe infinite. Make sure the motor is cool beforeattempting to measure resistance. The internalthermostat of the motor may be electricallyopen and will not close until the motor cools. Amotor that has measurable resistance to groundis shorted to ground and must be replaced.
NOTE: When troubleshooting fan motors, testcapacitors first (covered on following pages). Ifcapacitors are not faulty, fan motors may need to bereplaced.
21
FAN
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XX
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XX
XX
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NM
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RIN
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MAT
ION
GA
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ser
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(BTU
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7000
7000
9000
9000
1200
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1500
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GA
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GA
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AA
Ser
ies
GA
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GA
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erie
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Ser
ies
265
208/
230
265
208/
230
208/
230
265
Des
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tion
1500
0 G
AE, 1
2000
GAE
/GAA
Ser
ies
GA
A S
erie
sIn
do
or
Fan
Mo
tor
Info
rmat
ion:
Gre
e’s
Mo
tor
Par
tNum
ber
1501
1802
0215
0118
0204
1501
1802
1501
1802
0115
0118
0203
1501
1802
0315
0118
0205
Mo
tor
Man
ufac
ture
rZh
ongs
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rical
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Mo
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Man
ufac
ture
r’s
Par
tNum
ber
FN18
FFN
18P
FN21
FFN
21P
FN23
FFN
23F
FN23
PM
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rVo
ltag
e20
8/23
026
520
8/23
026
520
8/23
020
8/23
026
5M
oto
rH
ors
epo
wer
(Wat
ts)
0.02
4(1
7.9)
0.02
4(1
7.9)
0.02
9(2
1.6)
0.02
9(2
1.6)
0.03
1(2
3.1)
0.03
1(2
3.1)
0.03
1(2
3.1)
Mo
tor
Full
Load
Am
ps
0.1
0.2
0.2
0.2
0.2
0.2
0.2
Mo
tor
Sp
eed
s3
33
33
33
Res
ista
nce
(Ohm
s)B
lack
toB
row
n51
7.4±
8%(a
t68°
F/20
°C)
502.
2±8%
(at6
8°F/
20°C
)39
1.7±
8%(a
t68
F/20
C)
568±
8%(a
t68°
F/20
°C)
247±
8%(a
t68°
F/20
°C)
247±
8%(a
t68°
F/20
°C)
421.
7±8%
(at6
8°F/
20°C
)
Res
ista
nce
(Ohm
s)B
lack
toR
ed32
8.0±
8%(a
t68°
F/20
°C)
202.
5±8%
(at6
8°F/
20°C
)22
2.3±
8%(a
t68
F/20
C)
238.
2±8%
(at6
8°F/
20°C
)30
3±8%
(at6
8°F/
20°C
)30
3±8%
(at6
8°F/
20°C
)19
2.2±
8%(a
t68°
F/20
°C)
Res
ista
nce
(Ohm
s)B
lack
toYe
llow
33.2
±8%
(at6
8°F/
20°C
)26
.8±
8%(a
t68°
F/20
°C)
22.4
±8%
(at6
8F/
20C
)25
.8±
8%(a
t68°
F/20
°C)
50.8
±8%
(at6
8°F/
20°C
)50
.8±
8%(a
t68°
F/20
°C)
110.
2±8%
(at6
8°F/
20°C
)
Res
ista
nce
(Ohm
s)B
lack
toB
lue
67.0
±8%
(at6
8°F/
20°C
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.4±
8%(a
t68°
F/20
°C)
42.2
±8%
(at6
8F/
20C
)38
.2±
8%(a
t68°
F/20
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80.4
±8%
(at6
8°F/
20°C
)80
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F/20
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159.
8±8%
(at6
8°F/
20°C
)O
utd
oo
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nM
oto
rIn
form
atio
n:
Gre
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Mo
tor
Par
tNum
ber
1501
1034
315
0110
345
1501
1047
1501
1048
1501
1034
2
Mo
tor
Man
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ture
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Man
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FW40
GFW
40P
FW65
GFW
65G
FW45
PM
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ltag
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026
520
8/23
020
8/23
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5M
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wer
(Wat
ts)
0.05
4(4
0.3)
0.05
4(4
0.3)
0.08
8(6
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0.08
8(6
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7)M
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60.
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11
11
1
Res
ista
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(Ohm
s)B
lack
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row
n14
7±8%
(at6
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20°C
)28
7.4±
8%(a
t68
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0°C
)96
±8%
(at6
8°F/
20°C
)97
.8±
8%(a
t68
F/20
C)
214.
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(at
68°F
/20°
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Res
ista
nce
(Ohm
s)B
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ed98
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(at6
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20°C
)20
3.2±
8%(a
t68
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)
1501
1034
315
0110
345
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FW40
GFW
40P
208/
230
265
0.05
4(4
0.3)
0.05
4(4
0.3)
0.4
0.3
11
147±
8%(a
t68°
F/20
°C)
287.
4±8%
(at
68°F
/20°
C)
98±
8%(a
t68°
F/20
°C)
203.
2±8%
(at
68°F
/20°
C)
107±
8%(a
t68°
F/20
°C)
110.
4±8%
(at6
8F/
20C
)13
8.1±
8%(a
t68
°F/2
0°C
)
22
CAPACITORSFor capacitor locations and identification refer toFig. 48.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injury.Capacitors are capable of holding charge similar to a batteryand may cause an electrical shock.
! WARNING
Capacitors
NOTE: Wiring diagram shows both indoor andoutdoor fan capacitors are designated as C2. toensure correct capacitor is tested, verify that outdoorfan capacitor is wired to M2 (outdoor fan motor ) andindoor fan capacitor is wired to M3 (indoor fanmotor).Run--circuits on single--phase compressor motors usecapacitors which dramatically affect the motoroperation. Run capacitors are connected to the motorcircuit at all times.To evaluate the capacitor, perform a visual checkfirst. A shorted capacitor may give a visualindication of its failure. For example, the pop--outhole at the top of a start capacitor may bulge or blowout. A run capacitor may bulge or leak. In theseinstances, the capacitor must be replaced with onerecommended by the manufacturer. If there are novisual signs of capacitor failure, testing of thecapacitor resistance may be done with avolt--ohmmeter as follows:
1. Turn off unit power as described in UNITDIS--ASSEMBLY section but do not unplug theservice cord; it will supply ground connectionfor the unit chassis. Check to ensure power isoff and LOCKED OUT.
2. Connect one lead of a 20,000 ohm, 2--wattresistor to the center group of terminals on thedual capacitor. Attach the other lead from theresistor to an unpainted metal section of the unitchassis. This allows that section of the dualcapacitor to discharge. Repeat this processbetween the other group of terminals.
3. Locate and disconnect the wires from the startand/or run capacitor to isolate them from theremainder of the circuit. Refer to the unitwiring diagram (Fig. 60) if you need assistancelocating wires.
4. Perform capacitor test. Set up thevolt--ohmmeter to measure resistance byconnecting terminals C to HERM on the meter.
5. The reading on the meter should first indicatezero, or a low resistance, then slowly risetoward infinity or some high value ormeasurable resistance. This indicates thecapacitor is most likely good. If the readinggoes to zero or a low resistance and stays there,the capacitor is likely shorted and needsreplacement. If the reading immediatelyindicates infinity, the capacitor is likely openand must be replaced.
6. Replace the capacitor if failed and rewireaccording to the wiring schematic. See Fig. 60.
The Gree GA series model uses 3 capacitors. the compressor capacitor (designated on wiring diagram as C1), the indoor fan capacitor, and outdoor fan capacitor (both of which are designated as C2 on wiring diagram). See Fig. 60.
23
CONDENSATE DRAIN VALVEThecondensatedrain valveis atemperature--activatedvalve that begins to open when outdoor temperaturedrops below 59˚ F (15˚ C). The valve function allowswater to build up in the basepan at higher ambienttemperatures (>59˚ F / >15˚ C) and drains at lowertemperatures to prevent water from freezing in thebasepan. At higher ambient conditions, above 59˚ F(15˚ C), the collected water is distributed on theoutdoor coil by the slinger ring and evaporated intothe air passing through the heating coil. The basiclocation and installation of the condensate drain valveis shown in Fig. 45.The condensate drain valve may be faulty or theoutlet may be plugged if the basepan is full of water
at ambient temperatures below 45˚ F (7.2˚ C) (drainvalve should be open), or if the outdoor fan hasbecome frozen. If this is the case, the condensatedrain valve should be inspected to determine if it mayneed to be replaced or if any obstructions must beremoved from the drain pan opening. The condensatedrain valve may also fail in the open position. If thewater continuously drains from the basepan atambient temperatures greater than 59˚ F (15˚ C), thedrain valve should be inspected to determine if it mayneed to be replaced.NOTE: If outdoor fan has become frozen due tobuildup, slinger ring may have been damaged and inneed of replacement. See Fig. 46.
A07550
Fig. 45 – Condensate Drain Valve
SLINGERRING
CONDENSER SECTION
CONDENSATIONSUCTION PORT
A07678
Fig. 46 – Slinger Ring
24
INDOOR COIL SENSORThe indoor coil temperature sensor is located on thereturn bend end of the indoor coil (closest to thecontrol box) and is labeled “TUBE” on the schematicdiagram. The sensor is mounted in a well brazed tothe coil to provide better sensor response (see figure48 for approximate location). The indoor coiltemperature sensor prevents the indoor coiltemperature from exceeding operating limits. Thesensor wiring connects the sensor bulb to the controlboard in the control box. Resistance testing theindoor coil sensor will verify operation is withinrange. The resistance in Ohms should be taken at theboard connection end of the sensor lead wires. Theresistance of the indoor coil temperature sensor varieswith temperature. The approximate correlationtemperatures are listed in Appendix A. If the sensorresistance reading is open or shorted, the sensor hasfailed.
Indoor Coil Sensor
A08590
Fig. 47 – Location of Indoor Coil Sensor
OUTDOOR COIL SENSORThe outdoor coil temperature sensor is located on thereturn bend end of the outdoor coil (closest to thecompressor) and is labeled “OUTTUBE” on theschematic diagram. The sensor is mounted in a wellbrazed to the coil to provide better sensor response(see figure 49 for approximate location). The outdoorcoil temperature sensor prevents the outdoor coiltemperature from exceeding operating limits and actsas the board sensor input for defrost function on heatpump units. The sensor wiring connects the sensorbulb to the control board in the control box.Resistance testing the outdoor coil sensor will verifyoperation is within range. The resistance in Ohmsshould be taken at the board connection end of thesensor lead wires. The resistance of the outdoor coiltemperature sensor varies with temperature. Theapproximate correlation temperatures are listed inAppendix A. If the sensor resistance reading is openor shorted, the sensor has failed.
BASEPAN
COMPRESSOR
CAPILLARY TUBE
OUTDOOR COILTEMPERATURE SENSOR
OUTDOOR COIL
A08544
Fig. 48 – Location of Outdoor Coil Sensor
LOGIC BOARD(PCB2)
RELAY BOARD(PCB1)
OUTDOOR FANCAPACITOR
INDOOR FAN CAPACITOR
PLUG CONNECTOR
COMPRESSORCAPACITOR
JUNCTION BOX
A09324
Fig. 49 – Location of Components Inside Control Box
25
ROOM TEMPERATURE SENSORThe room temperature sensor is located in the middleof the indoor coil and reads the temperature on theinside of the room. The room temperature sensor haswiring that runs to the circuit board on the inside ofthe control box.Theapproximatecorrelation temperaturesare listed inAppendix A. If the sensor resistance reading is openor shorted, the sensor has failed.
OPERATING CONTROL FUNCTIONS /PROTECTIONSKeypad ControlsThe keypad for the GREE GA series models is located on the top right of the front of the unit and serves as an interface for common user controls. See Fig. 50.
A07632
Fig. 50 – Keypad Controls
Keypad Button FunctionsThere are 5 buttons on the keypad: ON/OFF, UP,DOWN, MODE, and FAN SPEED. There is a 3second delay between mode changes but the displaywill change immediately. This will prevent going inand out of modes while scrolling through keypad.
While in OFF Mode:Only ON/OFF, UP, DOWN, and MODE buttons areenabled. If UP or DOWN buttons are pressed, a 7segment display will show indoor air temperature for15 seconds. If ON/OFF or MODE buttons arepressed, the unit will be started in last used modesetting.
While in ON Mode:All buttons are enabled. The button functions aredefined below.
Button FunctionON/OFF Turns unit ON or OFF when pressed
MODESwitches run mode between COOL, HEAT, and FANONLY
FAN SPEEDSpecifies HIGH, MED, or LOW fan speed whenpressed
UP Increases the temperature set point valueDOWN Decreases the temperature set point value
Keypad selected functionsFAN ONLY ModeFAN ONLY and MEDIUM fan speed is the defaultmode when unit is first powered ON.While in FAN ONLY mode:
• The FAN ONLY mode LED indicator is ONas well as the requested fan speed LEDindicator.
• The indoor fan will run at the requested fanspeed (High, Medium, or Low).
• The compressor and electric heat aredisabled.
• The UP and DOWN buttons on the keypadwill be disabled.
• The air temperature of the room is displayed(display range is between 32˚ F~ 122˚ F, 0˚C~ 50˚C).
• The indoor LED indicator will be on,showing the room temperature.
• Fan speed will remain constant duringchanges to other modes of operation.
OFF Mode:While unit is in OFF mode:
• The 7 segment display will be blank.• The Power LED indicator will be red to show
the unit is still plugged in. All otherindicator LEDs will be off.
• All outputs will be disabled but Freeze Guardprotection feature will still be available (seeFreeze Guard section).
COOL Mode:While unit is in COOL Mode:
• Reversing valve is de--energized• COOL Mode LED indicator is ON• Setpoint LED indicator is ON and 7 segment
display shows temperature setpoint value(unless configured to show room temp.)
• Setpoint remains constant with modechanges.
• Fan speed remains constant with modechanges.
Regular Cooling Operation:1. If indoor air temperature + temperature cool
bias is greater than or equal to temperaturesetpoint + 2˚ F (1˚C):
— Cooling is requested— Outdoor fan starts to run— Indoor fan motor runs at fan speed
requested— 10 seconds later, the compressor is
allowed to start up— Fan motors will energize immediately
26
NOTE: Compressor may not start because of internalprotections or timers (see Diagnostic section).
2. When indoor air temperature + cool bias is lessthan or equal to temperature setpoint -- 2˚ F(1˚C):
— Cooling is satisfied— Compressor and outdoor fan stop running— Indoor fan motor runs at the requested fan
speedNOTE: If fan cycle for cooling mode has beenselected through dip switches, the indoor fan willoperate for 60 seconds after the compressor hasde--energized. CYCLE Mode will not override anyprotections which requires the indoor fan to be ON.
COOLING Mode protectionsOutdoor Coil High Temperature ProtectionSafety Start Condition: If outdoor coil temperaturerises above 149˚ F (65˚ C) continuous for 1 minute,the outdoor coil high temperature protection isactivated and compressor will turn off.Safety Stop Condition: If the outdoor coil hightemperature protection is active and outdoor coiltemperature falls below 131˚ F (55˚ C) continuouslyfor 2 minutes, the outdoor coil high temperatureprotection de--activates and compressor will beallowed to restart.
Indoor Coil Anti--Freeze ProtectionSafety Start Condition: If indoor coil temperaturefalls below 28˚ F (--2˚ C) continuously for 1 minute,the indoor coil anti--freeze protection is activated.The compressor and outdoor fan will turn off.Safety Stop Condition: if the indoor coil anti--freezeprotection is active and indoor coil temperature risesabove 40˚ F (5˚ C) continuously for 2 minutes, theindoor coil anti--freeze protection de--activates. Thecompressor and outdoor fan will be allowed to restart.
Temperature Setpoint LimitThis feature is a configurable option that applies toboth heating and cooling modes. It allows the ownerto configure what the minimum and maximumsetpoint values will be, regardless of what the userselects on the display.The following ranges can be selected through use ofdipswitches. Refer to Dip Switch section.Range 1: 61~ 86˚ F (16~ 30˚C)+Range 2: 63~ 80˚ F (18~ 28˚ C)Range 3: 65~ 78˚ F (19~ 26˚C)Range 4: 68~ 75˚ F (20~ 24˚C)NOTE: The unit setpoint display will show the fullrange of 61~ 86˚ F (16~ 30˚C) no matter which limit
range is selected. The software will control to theactual setpoint limit selected.Heat ModeWhile the unit is in HEAT mode:
— The reversing valve stays energized aslong as heat pump heating is being used.
— HEAT mode LED indicator is ON,requested fan speed LED indicator is ON,and the 7 segment display will showsetpoint temperature (unless configured toshow room temperature).
— Setpoint and fan speed remain constantwith mode changes.
Regular Heating Operation:Heat Pump ModelsNOTE: The compressor and electric heaters are notallowed to run at the same time. The regularoperation conditions are defined below.
1. If indoor temperature -- temperature heat biasfalls between 5˚ F (3˚C) less than the setpointtemperature, and 2˚ F (1˚C) less than thesetpoint temperature, the following occurs:
— Heating is requested— Reversing valve becomes energized— Outdoor fan starts to run— Indoor fan starts to run at requested fan
speed— 10 seconds later, compressor is allowed to
restart2. If indoor temperature -- temperature heat bias
falls to less than setpoint temperature --5˚ F(--3˚C), the electric heater will be used toproduce heat quickly (compressor will turn offif it was on), the indoor fan will run atrequested speed. Once step 2 is initiated, theunit will continue to heat with electric heat untilthe demand is satisfied.
3. If heat pump is needed while the compressor isdisabled by protection, the electric heater willreplace the compressor after a 15 second delay.
4. If indoor temperature -- temperature heat bias isgreater than setpoint temperature +2˚ F (+1˚C):
— Heating satisfied (heating demand is off)— Compressor or electric heater stops— If configured for fan cycle (through dip
switch setting), the indoor fan willcontinue to run at the requested speed for60 seconds to blow the remaining heatfrom the unit. Fan will then turn off.
— If configured for continuous mode, theindoor fan will run at the user selectedspeed.
27
Heat/Cool ModelsHeat/Cool models use electric heat only for heating.Normal operating conditions are defined below:
1. If indoor temperature -- temperature heat bias isless than or equal to the setpoint temperature--2˚ F (1˚C), the electric heater starts up and theindoor fan will run at requested speed.
2. If indoor temperature -- temperature heat bias isgreater than setpoint temperature +2˚ F (1˚C):
— Heating is satisfied (heating demand isoff)
— Electric heater stops— If configured for fan cycle (through dip
switch setting), the indoor fan willcontinue to run at the requested speed for60 seconds to blow the remaining heatfrom the unit. Fan will then turn off.
— If configured for continuous mode, theindoor fan will run at the user selectedspeed.
Heating mode protectionsIndoor Coil High Temperature Protection(Heat Pump Models Only)Safety Start Condition: If indoor coil temperaturerises above 136˚ F (58˚ C) continuously for 1 minute,the indoor coil high temperature protection activates.The compressor and outdoor fan will be turned off.Safety Stop Condition: If the outdoor coil hightemperature protection is active and outdoor coiltemperature falls below 126˚ F (52˚ C) continuouslyfor 2 minutes, the indoor coil high temperateprotection de--activates. The compressor and outdoorfan will be allowed to restart (all other safeties andprotections will still be enforced).
Sound ProtectionWhen turning the unit off or changing the operationmode, the reversing valve will de--energize 2 minutesafter the compressor has stopped.
Defrost (Heat Pump Models Only)Safety Start Condition: If the outdoor coiltemperature falls below 28˚ F (--2˚ C) continuouslyfor 1 minute and the accumulated compressor runtime is above the minimum run time, DEFROSTactivates. The compressor and outdoor fan will stopand the electric heater will replace the compressoruntil DEFROST de--activates.Safety Stop Condition: If DEFROST is active andthe outdoor coil temperature rises above 40˚ F (5˚ C)continuously for 10 minutes, DEFROST de--activatesand the compressor and outdoor fan will be allowedto restart at the next heating cycle.
MISCELLANEOUS PROTECTIONS
Freeze Guard ProtectionFreeze Guard Protection is only active in OFF, FANONLY, and COOL modesSafety Start Condition: If Freeze Guard Protectionis enabled (dip switch) and the indoor air temperatureis below 40˚ F (5˚ C), Freeze Guard activates. Theelectric heater and indoor fan will turn ON and the 7segment display will show “FP”.NOTE: Freeze Guard Protection mode cannot bestopped using the keypad or wall thermostat.Safety Stop Condition: When the indoor airtemperature rises to 50˚ F (10˚ C), Freeze Guardde--activates.
Temperature Sensor Open/Short FailureIf any temperature sensor has an open or short failure,a warning signal will be sent to the main STATUSLED indicator and the 7 segment display will showthe failure code. When this happens in COOLING orFAN ONLY modes, only the indoor fan is allowed torun. For HEAT mode, all outputs will be disabled.
Minimum Compressor ON TimeAny time the compressor relay turns ON, there mustbe a 3 minute minimum run--time regardless of theactual room temperature. This function preventsshort--cycling of the compressor. This protection canbe over--ridden by: other protections, turning the unitoff, a mode change, or adjusting the setpoint.
Minimum Compressor OFF TimeAny time the compressor switches OFF, or power isreset, the compressor will stay off for a random timeperiod of 2 minutes, 45 seconds to 3 minutes, 15seconds. This allows pressures to equalize.
Timer Speed--UpFor easier field service, push UP and DOWN buttonsat the same time and hold for 3 seconds. This willspeed up the internal timers for one compressor ONcycle.
Other Safety ProtectionsWhenever the compressor or electric heater runs, theindoor fan is always ON. If a wall thermostat isbeing used and there is a request for the compressoror electric heater, but no fan, the indoor fan will runat MED speed by default.The compressor and electric heater will never beallowed to run at the same time.
28
CONFIGURATION
DipswitchesAuxiliary dip switch controls can easily be foundbehind front panel.To access, remove front panel. See Fig. 3.7 Dip switches are accessible without opening thecontrol box.IMPORTANT: Unit must be powered down tochange their status. See Fig. 51 and Fig. 52.Factory settings for dip switches will be in theDOWN position. See Dip Switch Functions Tablefor the function of each dip switch position.NOTE: The Unit Type Selector dip switch is NOTaccessible without first opening the electrical box.the Unit Type Selector switch defines the unit typewhere ON is for heat pump, and OFF is for heat/cool.Effective changing of Unit Type Selector statusrequires the unit to be turned off.
Dip Switches
A07071
Fig. 51 – Dipswitch Location on Unit
Electric heat only (for Heat Pumps)Wall Thermostat enableFan CON/CYC for heatingFan CON/CYC for coolingSetpoint Limit 1Setpoint Limit 2Freeze guard
Dipswitch
UPDown
A07072
Fig. 52 – Dip Switches
DIP SWITCH FUNCTIONSNo, UP DOWN REMARKS DEFAULT
1 Electric Heat Only Heat Pump For Heat Pump unit only. DOWN
2 Wall Thermostat Enable Control Panel Enable DOWN
3 Fan Continuous Run for Heating Fan Cycle for Heat DOWN
4 Fan Cycle for Cool Fan Continuous Run for Cooling DOWN
5*6UP*UP
68---75 ˚F20---24 ˚C
UP*DOWN63---80 ˚F18---28 ˚C
DOWN*UP65---78 ˚F19---26 ˚C
DOWN*DOWN61---86 ˚F16---30 ˚C(full range)
Two configurations (5*6)combine to select set pointrange.The display always showsthe full range.
DOWN*DOWN61---86 ˚F16---30 ˚C
7 Freeze Guard Disable Freeze Guard Enable DOWN
29
Keypad ConfigurationAllows further configuration of system.NOTE: Changes do not take affect until power iscycled on the unit.
To enter Keypad configuration
Cycle power to unit. Press and hold the Fan SpeedButton and the setpoint DOWN button for 5continuous seconds, within 30 seconds of the unitbeing powered up. If the unit has had power for morethan 30 continuous seconds, keypad configurationcannot be entered. When keypad configuration modeis first entered, it will default to Fahrenheit/ CelsiusDisplay Mode.
To scroll through the Keypad Configuration OptionsPress and release the Fan Speed button. The storedvalue will be displayed.
To modify configuration settingsPress and release the Setpoint Up or Setpoint Downbuttons.
To exit Keypad ConfigurationKeypad Configuration will end on its own 30 secondsafter the last button press or when the MODE buttonon the Keypad is pressed.
Fahrenheit/ Celsius Display Switch:Change between degrees Fahrenheit and Celsius onthe display. An “F” indicates Fahrenheit display and‘C’ indicates Celsius. Default is degrees “F”.
Indoor Air Temperature Sensor Biasing for Cooling mode:Sometimes known as an anticipator, the airtemperature sensor bias is used to adjust the room airtemperature reading when in cooling mode. (Notnormally required.) Default biasing value is zero.NOTE: The range for biasing change is --6˚ F to+6˚ F (--3˚C to +3˚C)
Indoor Air Temperature Sensor Biasing for Heating mode:Sometimes known as an anticipator, the airtemperature sensor bias is used to adjust the room airtemperature reading when in heating mode. (Notnormally required.) Default biasing value is zero.NOTE: The range for biasing change is --6˚ F to+6˚ F (--3˚C to +3˚C)
Indoor Temperature Display:Change between showing setpoint only on the displayduring heating and cooling modes “SP” or displayingroom temperature during heating and cooling modes“AA”. “SP” mode is the default mode.
• If “SP” is selected, only the setpoint will bedisplayed during heating and cooling modes,regardless of what the real temperature is inthe room.
• If “AA” mode is selected, the roomtemperature will be displayed during heating,cooling and fan only modes.
— If the mode button has been changed toeither heating or cooling modes, setpointwill be displayed for 10 seconds. After the10 seconds, the room temperature willagain be displayed.
— If the on/off button is depressed (when theunit is off) and the last mode was eithercooling or heating mode, the setpoint willbe displayed for 10 seconds beforedisplaying room temperature.
— During heating and cooling modes, ifeither the up or down setpoint button isdepressed, the display will show thesetpoint for 10 seconds after the last up ordown button press. Then the roomtemperature will be displayed again.
30
WALL THERMOSTAT INTERFACE
Wall Thermostat TerminalNOTE: If configured for a wall thermostat, thedigital display and buttons on the control pad becomedisabled.IMPORTANT: Only trained, qualified personnelshould access electrical panel on unit and installelectrical accessories. Please contact your localelectrical contractor, dealer, or distributor forassistance.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Disconnect all power to unit to avoid possible electricalshock during service or installation.
! WARNING
Wall thermostat terminal connectionsThe wall thermostat terminal block is located behindthe front panel and is easily accessible.
STATUS LED
Wall Thermostat Terminal Connections
Energy Management Terminal Connections
A07088
Fig. 53 – Terminal Connector and Status LED Location
UNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.
Improper wiring may damage unit electronics. Commonbusing is not permitted. Damage or erratic operation mayresult.
CAUTION!
Thermostat Wire RoutingThermostat wire is field supplied. Recommendedwire gauge is 18 to 20 gauge solid thermostat wire.NOTE: It is recommended that extra wires are run tounit in case any are damaged during installation.Thermostat wire should always be routed around orunder, NEVER through, the wall sleeve. The wireshould then be routed behind the front panel to theeasily accessible terminal connector. See Fig 45.
THERMOSTAT WIRE ROUTING (UNDER SLEEVE, BEHIND FRONT PANEL)
A07074
Fig. 54 – Proper Wire Routing Beneath Unit
31
Wiring Thermostat To UnitWire wall thermostat input as defined in Fig. 55.NOTE: Terminal connector can be removed andreplaced to simplify the wiring (see Fig. 56).NOTE: For heat pump models, anytime there is asecond--stage call for heating from the wallthermostat, the unit will automatically switch over toelectric heating.
R
Y
GH
GL
C
W
O
Common
Energy Management
(24VAC in)
TYPICAL WALL THERMOSTAT
TERMINAL BLOCK
See Note 1
See Note 2
NOTES:1. Use terminal “O” for heat pump connection only.2. Terminal “C” (common) is typically only required for digital
thermostats.A07076
TERMINAL DESIGNATION
R 24 VAC
W Electric Heat
Y Compressor
O Reversing Valve
GH High Fan
GL Low Fan
C Common
NOTE: Any illegal input combinations will be captured as thermostat wiringfailures and will light the STATUS LED indicator on main board(see Intelligent Self ---Checking Control section)
Fig. 55 – Wiring Connections
R W Y O Gh Gl C
A07073
Fig. 56 – Terminal Connector Removal and Replacement
Install Thermostat Wiring1. Check to be sure power to unit is disconnected.2. Pull terminal connector to remove3. Connect wires from the thermostat to terminals
on unit terminal connector.4. Reinstall terminal connector.5. Ensure that unit is configured for wall
thermostat enable.6. Replace control panel label with wall
thermostat label (included with Owner’sManual). See Fig. 57.
7. Restore power to unit.8. Typical wiring schematic for multiple units
connected to single wall thermostat is shown inFig. 58.
WALL THERMOSTAT COMFORT
A07315
Fig. 57 – Wall Thermostat Control Panel Label
NOTE: For thermostats that have only one fan speedoutput (on or auto), the fan speed is determined byhow the terminal connector is wired. If Low fan isdesired, wire the G output from the thermostat to GLon the unit’s terminal block. If Hi fan is desired, wirethe G output from the thermostat to GH on the unit’sterminal block.NOTE: After proper installation, if your thermostat isnot working properly, refer to the Trouble Shootingsection.
32
R
Y
W
G
O
C
R
Y
W
G
O
C
R
Y
W
G
O
C
R
Y
W
G
O
C
R
Y
W
G
O
C
T’STATMASTERPTAC
UNIT 1
UNIT 2
UNIT 3
1. Do not daisy chain R (24 VAC).2. Maximum of 4 PTAC units can be connected to one single wall
thermostat.3. Wall thermostat wire is field-supplied and should be 18 to
20 gage solid thermostat wire.
CAUTION
All units must be connected to thesame ground source.To accomplish this, be sure toconnect all units back to the samebreaker box.
A07391
Fig. 58 – Typical Wiring Schematic for Multiple PTAC Units Connected to a Single Wall Thermostat
33
ENERGY MANAGEMENT INPUT(FRONT DESK CONTROL)The controller can handle a switch signal from remoteenergy management input, called EM signal or frontdesk control. Input must be 24VAC. If systemreceives a 24VAC signal, it will turn unit off;
otherwise, the unit runs in normal control. Thisfunction will be disabled under Freeze Guardprotection. For energy management wiringschematic, see Fig. 59.
FRONT DESK SWITCH PANEL
24-VTRANSFORMER
(SEE NOTE 1)
PTAC #1 PTAC #2 PTAC #N
N MOOR101 MOOR001 MOOR
B W B W B W
FIELD-SUPPLIED
LEGEND
NOTES:1. To size transformer, use the following equation:
Quantity of PTAC units x 12 va = Transformer Size (va)Example: 110 PTAC Units x 12 va = 1320 va Transformer
2. Following are recommended wire sizes:AWG WIRE SIZE NO. MAXIMUM LENGTH ft (m)
AWG --- American Wire GageB --- BlackPTAC --- Packaged Terminal Air ConditionerW --- White
A07390
Fig. 59 – Energy Management Wiring Schematic
CONTROL DIAGNOSTICSIntelligent Self--Checking ControlYour Gree PTAC has a computer board thatcontinuously checks key components of the unit toensure they are operating properly. Under normaloperation, unit status indicator (STATUS, on mainPCB), light is steadily ON. If there is a majorproblem, the unit will shut down and display a
diagnostic failure code on the unit’s display. If it isonly a minor failure and unit is correcting the fault byitself, the diagnostic code will be flashed on the statusLED that can easily be seen when the front panel isremoved (see Fig. 53). Failure STATUS codes aredefined in the table below.
STATUS LED INDICATOR DEFINITIONS1 Indoor air temp sensor open/short 7---segment display ‘F1’, with STATUS light flash 1 time,off 2 seconds2 Indoor coil sensor open/short 7---segment display ‘F2’, with STATUS light flash 2 time,off 2 seconds3 Outdoor coil sensor open/short 7---segment display ‘F4’, with STATUS light flash 4 time,off 2 seconds4 Freeze Guard protection 7---segment display ‘FP’5 Thermostat wiring error STATUS light flash 9 times and off 3 sec, repeat6 Indoor coil high temp protection STATUS light flash 8 times and off 3 sec, repeat7 Defrost (heat pump type) STATUS light flash 7 times and off 3 sec, repeat8 Outdoor coil high temp protection STATUS light flash 6 times and off 3 sec, repeat9 Indoor coil freeze protection STATUS light flash 5 times and off 3 sec, repeat
NOTE: When status light is flashing, it will be ON for 0.5 seconds and OFF for another 0.5 seconds.
34
A08389
Fig. 60 – Typical Wiring Schematic for Standard Units
*NO
TE: D
ashe
d ar
ea a
bove
sho
ws
RE
VE
RS
ING
VA
LVE
. I
t is
foun
d on
ly in
HE
AT
PU
MP
(M
Q)
mod
els.
LEG
EN
DA
P1
Mai
n C
ircui
t Boa
rdA
P2
Rel
ay C
ircui
t Boa
rdA
P3
Dis
plal
y C
ircui
t Boa
rdC
1C
ompr
esso
r C
apac
itor
C2
Fan
Mot
or C
apac
itor
L1, L
2E
lect
ric H
eate
r R
elay
L3C
ompr
esso
r R
elay
M1
Com
pres
sor
Mot
orM
2O
utdo
or F
an M
otor
M3
Indo
or F
an M
otor
OU
TTU
BE
Out
door
Coi
l Sen
sor
RO
OM
Roo
m A
ir Te
mp.
Sen
sor
SA
TC
ompr
esso
r O
verlo
adTC
Tran
sfor
mer
TRIN
-24V
Tran
sfor
mer
24
Volt
Con
nect
orTU
BE
Indo
or C
oil S
enso
rX
1M
ain
Pow
er C
onne
ctor
X2
Hea
ter
Con
nect
orX
3H
eate
r Li
mit
Con
nect
orX
4In
door
Fan
Mot
or C
onne
ctor
X5,
X6
Tran
sfor
mer
Con
nect
orX
7,X
8B
oard
Jum
per
Con
nect
orX
T1Te
rmin
al B
lock
(W
hite
)X
T2Te
rmin
al B
lock
(B
lack
)Y
VR
ever
sing
Val
ve (
Hea
t Pum
p U
nits
)
35
TROUBLESHOOTINGPOSSIBLE CAUSES SOLUTIONS
UNIT DOES NOT START
• Unit may have become unplugged• Fuse may have blown• Circuit breaker may have been tripped• Unit may be off or in wall thermostat mode.
Check section on dipswitch settings to verifydipswitches are set properly.
• Unit may be in a protection or diagnostic failuremode. See section on Intelligent Self ---checkingControl.
• Check that plug is plugged securely in wall receptacle.Note :Plug has a test/reset button on it. Make sure that the plughas not tripped.
• Replace the fuse. See Note 1.• Reset circuit breaker. See Note 1.• Turn unit on (bottom right button on keypad).
Note: If the unit turns on, the LED will be green. If the unit is off,the LED will be red. If there is no LED on, there is a problemwith power or damage to the control.
UNIT NOT COOLING/HEATING ROOM
• Unit air discharge section is blocked• Temperature setting is not high or low enough
Note: Setpoint limits may not allow the unit to heator cool the room to the temperature desired.Check section on dipswitch settings.
• Unit air filters are dirty.• Room is excessively hot or cold when unit is started.• Vent door left open• Unit may be in a protection or diagnostic failure
mode. Check section on Intelligent Self ---checkingControl.
• Compressor is in time delay. There is a protectivetime delay (approx. 3 minutes) on starting thecompressor after a power outage (or restartingafter it has been turned off), to prevent tripping ofthe compressor overload.
• Make sure that curtains, blinds or furniture are not restricting orblocking unit airflow.
• Reset to a lower or higher temperature setting.• Remove and clean filters.• Allow sufficient amount of time for unit to heat or cool the room.
Start heating or cooling early before outdoor temperature, cookingheat or gatherings of people make room uncomfortable.
• Close vent door.• Check dipswitch settings for desired comfort.
Wait approximately 3 minutes for compressor to start
DISPLAY HAS STRANGENUMBERS/CHARACTERS ON IT
• The unit may be in a diagnostic condition. Check Intelligent Self ---checking Control section to determine if unit has had a failure.
• The unit may be set for ˚C (instead of ˚F), see the keypadconfiguration section
UNIT MAKING NOISES • Clicking, gurgling and whooshing noises are normal duringoperation of unit.
WATER DRIPPING OUTSIDE • If a drain kit has not been installed, condensation runoff duringvery hot and humid weather is normal. See Note 2. If a drain kit hasbeen installed and is connected to a drain system, check gasketsand fittings around drain for leaks and plugs.
WATER DRIPPING INSIDE
• Wall sleeve is not installed level • Wall sleeve must be installed level for proper drainage ofcondensation. Check that installation is level and make anynecessary adjustments.
ICE OR FROST FORMS ON INDOOR COIL
• Low outdoor temperature• Dirty filters
• When outdoor temperature is approximately 55˚F (12.8˚C) orbelow, frost may form on the indoor coil when unit is in Coolingmode. Switchunit to FAN operation until ice or frost melts.
• Remove and clean filters.
COMPRESSOR PROTECTION• Power may have cycled, so compressor is in a
restart protection.
• Random Compressor restart --- Whenever the unit is plugged in,or power has been restarted, a random compressor restart willoccur. After a power outage, the compressor will restart afterapproximately 3 minutes.• Compressor Protection --- To prevent short cycling of thecompressor, there is a random start---up delay of 3 minutes and aminimum compressor run time of 3 minutes.
NOTES:1. If circuit breaker is tripped or fuse is blown more than once, contact a qualified electrician.2. If unit is installed where condensation drainage could drip in an undesirable location, an accessory drain kit should be installed and connected to drain
system.
36
CARE AND CLEANING
GENERAL CLEANING
COMPONENT CLEANING SCHEDULEIndoor Air Filter MonthlyVent Air Filter MonthlyIndoor Coil SeasonallyIndoor Fan Seasonally
Outdoor Coil Seasonally
CLEANING AND SAFETYBefore starting to clean a unit, read the instructionsthoroughly and gather the necessary tools for the job.Review all safety information on unit and inliterature.
Consider the following safety issues beforebeginning:
• New and unfamiliar tasks should beperformed under the supervision of anexperienced service technician.
• Personal protective equipment, such as safetyglasses and work gloves, should be used.
• The floor around the work area should beclean and free of debris.
• The unit weighs up to 150 pounds (68 kg). Usea lifting device or ask for assistance if the unitmust be moved.
• Make sure tools are the correct tools for thejob, and that they are working properly and ingood condition.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Before cleaning, servicing, performing maintenance, orremoving the chassis from the wall sleeve, disconnect allpower to the unit.Only trained and qualified service personnel should performinstallation and service procedures on these units. Untrainedpersonnel may perform basic maintenance tasks such ascleaning and replacing filters. Refer to Accessing UnitComponents section of this manual for proper procedures todisconnect power to units.
! WARNING
FRONTPANEL
INDOORCOIL
BASEPAN
DISCHARGEGRILLE
WIRE SCREEN
BI-MOLDED CONDENSER SHROUD
COIL TUBESHEETS
INDOOR-AIRFILTERS
ACCESSORYWALL
SLEEVE
ACCESSORYOUTDOOR
GRILLE
DIGITAL CONTROL PAD W/ELECTRONIC DISPLAY
WALL THERMOSTAT AND ENERGY MANAGEMENTINTERFACE
CONFIGURATION DIP SWITCHES
A06752
Fig. 61 – Typical GA series PTAC System
Maintaining proper performance of Gree GA series PTAC requires conscientious cleaning and care of components. See Figure 52. Specific components require periodic cleaning and/or replacement, includ-ing the following:
37
CARE AND CLEANING (CONTINUED)FRONT PANEL AND CASETurn unit off and disconnect power supply.To clean, use water and a mild detergent. DO NOTuse bleach or abrasives. Some commercial cleanersmay damage the plastic parts.
OUTDOOR COILCoil on outdoor side of unit should be checkedregularly. Unit will need to be removed to inspectdirt build--up that will occur on the inside of the coil.If clogged with dirt or soot, coil should beprofessionally cleaned.NOTE: Never use a high--pressure spray on coil.
Coil
Grille
Clean inside and outside of outdoor coil regularly . A07077
Fig. 62 – Outdoor Coil
UNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.
Airflow restriction may cause damage to the unit.
CAUTION!
BASE PANIn some installations, dirt or other debris may beblown into unit from outside and settle in base pan(bottom of unit).In some areas of the United States, a “jell--like“substance may be seen in the base pan. Check basepan periodically and clean, if necessary.
AIR FILTERSIMPORTANT: TURN UNIT OFF BEFORECLEANING
UNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.
Do not operate unit without filters in place. If a filterbecomes torn or damaged, it should be replacedimmediately.
Operating without filters in place or with damaged filterswill allow dirt and dust to reach indoor coil and reducecooling, heating, airflow and efficiency of unit. Airflowrestriction may cause damage to unit.
CAUTION!
Dirty filter- Needs cleaning
Clogged filter - Greatly reduces cooling,
heating and airflow.A07078
Fig. 63 – Identifying Clogged Filter
The most important thing you can do to maintain unitefficiency is to clean the filters at least every 30 days(or sooner depending on application). Clogged filtersreduce cooling, heating and airflow.Keeping filters clean will:
• Decrease cost of operation.• Save energy.• Prevent clogged indoor coil.• Reduce risk of premature component failure.
To Clean Air Filters:• Vacuum off heavy soil.• Run water through filters.• Dry thoroughly before replacing.
2 Air filters
Pull up Push down
A07080A07079retliFriAgnicalpeRretliFriAgnivomeR
Fig. 64 – Removing and Replacing Air Filter
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Cleaning Outdoor Vent Filter1. Open the vent door and remove 4 screws that
secure the outdoor filter to the partition. SeeFig. 65.
2. Remove the outdoor vent filter for cleaning.LOWER CONDENSER
