Catalog 219-2RoofPakSinglezone, Heating and Cooling Systems with Evaporative CondensersModels: RDE/RPE 76150 Tons
RDESWSI Airfoil (Plenum); SAF Draw-Through Cooling Coil; Filters; Steam or Hot Water Heat
RPEDWDI Airfoil; SAF Blow-Through or Draw-Through Cooling Coil; Filters; Electric, Gas, Steam or Hot Water Heat
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Table of ConTenTs
Table of ConTenTs
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A New Standard in Rooftop Systems with Evaporative Condensers . . . . . . . . . . . . . . . . . . . 3
Agency Listed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features and Options . . . . . . . . . . . . . . . . . . . . . . . . . . 4Energy Savings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Evaporative Condenser Energy Savings . . . . . . . . . . 6Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Refrigeration Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 8Evaporative Condenser . . . . . . . . . . . . . . . . . . . . . . 8Walk In Service Compartment . . . . . . . . . . . . . . . . . 9Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Air Handling Section . . . . . . . . . . . . . . . . . . . . . . . 10Electrical and Controls . . . . . . . . . . . . . . . . . . . . . . 10
Factory Installed and Wired Options . . . . . . . . . . . . 11Condensing Section. . . . . . . . . . . . . . . . . . . . . . . . 11Air Handling Section . . . . . . . . . . . . . . . . . . . . . . . 11Intelligent Equipment . . . . . . . . . . . . . . . . . . . . 12Daikin MictroTech III Rooftop Remote User Interface. . . . . . . . . . . . . . . . . . . . . . 13Electrical and Controls . . . . . . . . . . . . . . . . . . . . . . 13Multiple Unit Applications . . . . . . . . . . . . . . . . . . . . 13Field-Installed Roof Curbs . . . . . . . . . . . . . . . . . . . 13Optional Water Treatment . . . . . . . . . . . . . . . . . . . 14
Application Considerations . . . . . . . . . . . . . . . . . . . . 17General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Location and Curb/Rail Support. . . . . . . . . . . . . . . 17Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Economizer, Return Fan and Exhaust Fan Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Variable Air Volume (VAV) . . . . . . . . . . . . . . . . . . . 20MicroTech III Control . . . . . . . . . . . . . . . . . . . . . . . 20
Unit Operating Range . . . . . . . . . . . . . . . . . . . . . . . . 21Fan Operating Range . . . . . . . . . . . . . . . . . . . . . . 21Indoor Fan and Motor Heat, Blow-Through vs. Draw-Through Cooling . . . . . . . . . . . . . . . . . . . 22
Recommended Clearances. . . . . . . . . . . . . . . . . . . . 23Service Clearance . . . . . . . . . . . . . . . . . . . . . . . . . 23Cooling Coil, Heat, and Supply Fan Service Clearance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Overhead Clearance . . . . . . . . . . . . . . . . . . . . . . . 23Ventilation Clearance . . . . . . . . . . . . . . . . . . . . . . . 24Control and Power Wiring . . . . . . . . . . . . . . . . . . . 25Altitude Adjustments . . . . . . . . . . . . . . . . . . . . . . . 25Furnace Performance . . . . . . . . . . . . . . . . . . . . . . 26Freezing Concerns. . . . . . . . . . . . . . . . . . . . . . . . . 26Spray System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Hot Water and Steam Coils . . . . . . . . . . . . . . . . . . 26Water Treatment . . . . . . . . . . . . . . . . . . . . . . . . . . 26Condenser Water Connections . . . . . . . . . . . . . . . 27
Selection Instructions . . . . . . . . . . . . . . . . . . . . . . . . 28Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Cooling Capacity Data . . . . . . . . . . . . . . . . . . . . . . . . 32Heating Capacity Data . . . . . . . . . . . . . . . . . . . . . . . . 38Gas Piping Schematic . . . . . . . . . . . . . . . . . . . . . . . . 42Component Pressure Drops . . . . . . . . . . . . . . . . . . . 43Fan Performance Data . . . . . . . . . . . . . . . . . . . . . . . . 44
Return Fans & Exhaust Fans . . . . . . . . . . . . . . . . . . 44DWDI Supply Fans . . . . . . . . . . . . . . . . . . . . . . . . . . 45SWSI Plenum Supply Fans. . . . . . . . . . . . . . . . . . . . 47
Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Section Options and Locations . . . . . . . . . . . . . . . . . 48Typical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 51Electrical Knockout Locations . . . . . . . . . . . . . . . . . . 53Piping Entrance Locations . . . . . . . . . . . . . . . . . . . . 54
Roof Curbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Supply Power Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 60Unit Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Fan Motor Weights . . . . . . . . . . . . . . . . . . . . . . . . . . 63Roof Curb Weights . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Engineering Guide Specification . . . . . . . . . . . . . . . 64
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A New Standard in Rooftop Systems with Evaporative Condensers 76 through 150 tons Full factory operation test 100% make-up air, dehumidification, VAV or CV operation Modular construction and customized application flexibility Multiple fan, coil, filter and heat selections. High efficiency
compressor and coil combinations Factory integrated and commissioned MicroTech III
advanced DDC control system Daikins Open Choices feature provides building
automation system integration using BACnet MS/TP, BACnet IP, BACnet Ethernet, or LonTaLk communication protocol options
Durable, double-wall construction with access doors on both sides of each section
Heavy-duty evaporative condenser designed for easy maintenance with a walk-in service compartment
Blow-Through configuration for high sensible cooling and quieter operation
Draw-Through configuration for high latent cooling or high humidity applications
Agency Listed MEA
Manufactured in an ISO-Certified Facility
R P E - 150 C S E
Unit Configuration P = Blow-Through Cooling D = Draw-Through Cooling
Nominal Capacity (Tons) RPE, RDE: 076, 089, 100, 110, 130, 140, 150
Heat Medium A = Natural Gas E = Electric S = Steam W = Hot Water Y = None (Cooling Only)
Cooling Coil Size S = Standard (Low Airflow) L = Large (High Airflow)
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 4 www.DaikinApplied.com
feaTures and opTIons
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1 MicroTech III Control System Factory-installed and tested
to minimize costly field commissioning
Open Choice feature provides building automation system integration using BACnet MS/TP, BACnet IP, BACnet Ethernet, or LonTaLk communication protocol options
State-of-the-art keypad interface allows easy adjustment of Direct Digital Control functions, bi-directional communications, stand-alone or network operation*
Optionally: add the Intelligent Equipment control solution, which provides real-time data streams for benchmarking performance, monitoring system operations and implementing remote diagnostics and control
2 Airfoil Fans More energy efficient and quieter
than forward curved fans. Double width, double inlet (DWDI)
or single width, single inlet (SWSI) plenum fans
3 Durable Construction Pre-painted exterior cabinet
panels pass 750 hour ASTM B117 Salt Spray Test for durability
Heavy-duty R-6.5 insulation minimizes heat loss for reduced energy costs
Double-wall construction protects insulation and provides a wipe clean surface to inhibit microbial growth
Stainless steel, sloped drain pans eliminate standing water and provide long service life
Full unit base rail with heavy-duty lifting lugs provide single piece rigging of units up to 150 tons
4 SuperMod High Turndown Gas Burner Full 20:1 turndown and multiple
sizes enable precise temperature control at reduced design, installation, and life-cycle costs
Maintain comfortable tenant environment in VAV, 100% make-up air, and dehumidification applications
5 Hinged Access Doors On both sides of every section for
easy access to all components. Single lever latch and door
holders provide easy entry and support routine maintenance.
Double-wall construction protects insulation during maintenance.
6 Blank Sections Available throughout the unit
to factory-mount air blenders, carbon or charcoal filters, sound attenuators, humidifiers, or other specialty equipment.
Allow customization for maximum system performance and efficiency.
7 Walk-in Service Compartment Ventilation fan with a manual
shutter allows conditioned air into the service compartment for comfortable servicing in hot weather
Lights, electrical outlet, main control panel, spray pump, water connections, and optional water treatment system
Drain pan under the water piping and a raised floor grate in the pan keeps the walking area dry.
Single field connections to make-up water and drain lines
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8 Modular Flexibility Allows you to specify the unit you
want, optimized for high energy efficiency, good IAQ, and quiet operation
100% make-up air, dehumidification, CV, and VAV operation
Blow-Through cooling coil configuration (shown) provides higher sensible cooling, a quiet tenant environment, and energy savings
Draw-through cooling coil configuration provides higher latent cooling for make-up air systems or systems with high humidity loads
Multiple filter, fan, coil, and heating options and sizes to match system requirements.
Extended face area filters and coils reduce system pressure drops and improve efficiency
Multiple high efficiency compressor and coil combinations match
9 Return or Exhaust Fans Return fans can provide better
building pressure and ventilation control as return duct pressure drop increases.
Exhaust fans can save energy as return duct pressure drop requirements decrease.
10 Factory-Mounted Variable Frequency Drives Control fan motor speed for lower
fan operating costs and sound levels in VAV systems.
11 Economizer Outside air enters from both
sides, improving mixing for better temperature control.
DesignFlow Precision Outdoor Air Measurement and Control System accurately measures and maintains outdoor air quantity.
Patented UltraSeal low leak dampers minimize air leakage, reducing energy costs.
Generous face area intakes/outlets and control dampers reduce system pressure drops, improving efficiency.
12 Evaporative Condensing Section Open design allows easy access
to compressors and refrigerant piping
Unique rail support system allows the roof deck and insulation to help block compressor noise from entering the building
Condenser tube bundles. Replaceable, slide out, sectional,
sloped stainless steel sump. Heaviest piece weighs less than 175 pounds
Entire spray chamber is enclosed in stainless steel
Replaceable mist eliminators Replaceable air inlet screens Vertical discharge propeller
condenser fans with service guards reduce noise
PVC spray system with spray pump, water treatment connections and float control automatically maintains acceptable water levels
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Evaporative Condenser Energy SavingsAir cooled condensers can only reject heat to the ambient dry bulb as the condenser air passes over the condenser surface. Typical design dry bulb temperature is often considered to be 95F. However, actual rooftop dry bulb conditions are usually much greater due to solar heat on a dark roof. See Figure 1.
Evaporative condensers use a cooling spray of water that evaporates and cools the condenser air down toward the typical ambient wet bulb temperature of 75F. SeeFigure 2.
Evaporative condensers, therefore, reject heat to colder temperatures and operate at lower condensing temperatures. Therefore less compressor work and energy are required.
This allows compressors in an evaporative condensing unit to operate at lower condensing temperatures and consume 2540% less electricity than comparable air cooled units, especially at design conditions. Refer to Table 1.
Figure 1: Air-Cooled Condenser
Figure 2: Evaporative Condenser
Table 1: Air-Cooled vs. Evaporative-Cooled Condensers
Design Conditions Ambient TemperatureCondensing
Unit kW per tonCondensing
TemperaturesARI Design ConditionsAir Cooled 95/75F 1.151.20 125135FEvaporative Cooled 95/75F 0.840.88 105115FDesert Design ConditionsAir Cooled 110/72F 1.351.40 135145FEvaporative Cooled 110/72F 0.820.86 102112F
Rooftops with Evaporative Condensers Save Money
1. Savings in Electrical Consumption CostsBoth consumption and demand usually drive the electrical costs for large, non-residential customers. Electrical consumption is the total energy consumed and is usually measured in kW Hours. Several factors influence consumption, including unit efficiency, operating hours, and load profile. Daikins Energy Analyzer computer program is the ideal tool for estimating energy consumption for a given building.
2. Savings in Electrical Demand CostsElectrical demand is the peak energy consumed in a billing cycle and is usually measured in kW. Demand costs associated with air-cooled and evaporative-cooled rooftops are relatively easy to compare.
a. The 2540% reduction in peak design condensing unit kW translates into a 2540% savings in condensing unit demand costs. Based on utility rate structures, this can be a substantial savings.
b. In addition, Daikin offers airfoil supply and return fans that reduce design bhp and air handler demand costs by up to 20%.
3. Savings in Installation CostRooftop ampacity and electrical service costs are proportional to design kW. A 2540% reduction in condensing unit design kW translates into smaller and less expensive wires, disconnects and transformers that feed the rooftop units. Daikins airfoil supply and return fans often save one or two motor sizes and further reduce the required electrical service.
Typical Savings vs. Air-Cooled Rooftop SystemsTo illustrate the savings generated by evaporative condensing, consider a two-story shopping mall using several 125-ton VAV rooftop units and occupied 365 days a year. Assume external static pressures of 2.5" for each supply duct and 0.5" for return ducts. Table 2 through Table 4 show the Daikin RPE evaporative condenser rooftop if this mall is located in the Los Angeles, New York and Las Vegas.
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Table 2: Comparison of Evaporative and Air-Cooled Condensing for the Los Angeles Area MallConditions Air-Cooled Daikin RPEDesign Ambient Dry Bulb/Wet Bulb 95F/72F 95F/72FElectrical Consumption Rate (per kW Hour) $0.15 $0.15
Electrical Demand Rate (per kW) $24 $24
Condensing UnitEfficiency (kW/ton) 1.15 0.85
Electrical Cost $30,200 $22,100Percent Savings 27%All shopping mall energy analysis and comparison charts provided in this document have been generated using Daikin Energy Analyzer software.
Table 3: Comparison of Evaporative and Air-Cooled Condensing for the New York Area MallConditions Air-Cooled Daikin RPEDesign Ambient Dry Bulb/Wet Bulb 95F/75F 95F/75FElectrical Consumption Rate (per kW Hour) $0.11 $0.11Electrical Demand Rate (per kW) $18 $18
Condensing UnitEfficiency (kW/ton) 1.15 0.88Electrical Cost $17,860 $12,375
Percent Savings 31%All shopping mall energy analysis and comparison charts provided in this document have been generated using Daikin Energy Analyzer software.
Table 4: Comparison of Evaporative and Air-Cooled Condensing for the Las Vegas AreaConditions Air-Cooled Daikin RPEDesign Ambient Dry Bulb/Wet Bulb 110F/72F 110F/72FElectrical Consumption Rate (per kW Hour) $0.07 $0.07Electrical Demand Rate (per kW) $8 $8
Condensing UnitEfficiency (kW/ton) 1.40 0.85Electrical Cost $19,042 $11,351
Percent Savings 40%All shopping mall energy analysis and comparison charts provided in this document have been generated using Daikin Energy Analyzer software.
RPE Energy Costs are CompetitiveUsing the 0.85 kW/ton condensing unit efficiency from the previous example, Figure 3 shows a comparison of a Daikin RPE evaporative condenser rooftop system with a 0.55 kW/ton water-cooled chiller system. In this case, we assumed that the chiller system would have constant flow pumps and that it unloads to 0.46 kW/ton.
As shown in Figure 3, the energy performance of the two systems is very comparable, with the RPE offering a significant part load advantage and the chiller offering a small full load advantage. Given that most air-conditioning systems operate at 60% load or less over the great majority of a typical year, the Daikin RPE may be the best energy savings investment.
Figure 3: Comparable Energy Performance to Water-Cooled Chillers
Daikin Energy Analyzer Software ProgramDaikin Energy Analyzer is the perfect tool for quantifying the savings that can be generated by evaporative condensing. Energy Analyzer software can model energy consumption for almost any type of building based on local climate and utility costs.
Using Energy Analyzer to Quantify SavingsGo To The Primary System Screen (Figure 4)
1. Click On The Condensing Unit2. Click On Air Cooled or Evap Cooled3. Check The Defaults
For access to Daikin Energy Analyzer Software, contact your local Daikin representative for a copy. To locate your Daikin representative, visit DaikinApplied.com or call (800) 432-1342.
Figure 4: Energy Analyzer - Primary System Screen
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 8 www.DaikinApplied.com
Daikin RPE and RDE units contain the same air handler construction and controls as Daikin RPS and RDT applied rooftop units. For more detail, refer to RPS Catalog 214 and RDT Catalog 217. For a copy of these catalogs, contact your local Daikin representative or visit DaikinApplied.com.
Refrigeration Circuit Open condenser design allows easy service access to
compressors and refrigerant piping Multiple high efficiency Copeland Discus compressors
mounted on isolators with crankcase heaters, positive displacement oil pump, low oil pressure protection control, 3-leg internal motor protection and cylinder unloaders for up to 8 steps of capacity control
Dual refrigerant circuits include manual shut off valves on the suction, discharge and liquid lines, accessible sight glass, filter drier and solenoid valves (expansion valves are included in the air handler section). The controls include high and low refrigerant pressure protection control switches, manual control switch, and manual pump down switch
Compressors are allowed to operate down to 45F ambient, where economizer free cooling operation takes over
Evaporative Condenser Unique rail support system allows the roof deck and
insulation to help block compressor noise from entering the building
Condenser tube bundles are constructed of corrosion- resistant copper tubes, stainless steel casing, and polymer tube sheets
The sloped, stainless steel sump is divided into multiple sections that slide out for easy replacement. The heaviest section weighs less than 174 pounds
The entire spray chamber is constructed of corrosion- resistant stainless steel
Replaceable mist eliminators between the tube bundle and condenser fans minimize water consumption
Replaceable air inlet screens keep sunlight out of the sump and help prevent microbial growth
Direct drive condenser fans eliminate the service expense associated with belts and sheaves
Vertical discharge, propeller condenser fans with service guards reduce horizontal-radiated noise
3-phase, severe duty, totally enclosed condenser fan motors with current sensing overload protection and permanently lubricated bearings support extended product life
PVC spray system includes spray pump, water treatment connections and float control that automatically maintains acceptable water levels. Replaceable, clog resistant nozzles spray water across a 150 arc and completely wet the coil surface for improved performance. Single field connections to make-up water and drain lines can reduce installed cost
Figure 5: Standard RPE and RDE Spray System
Automatic FloatControlledIntake Valve
Hose Bib withManual Shut OffValve
See Figure 15 on page 16 for Water Treatment EnhancementsNOTE: The cyclone separator is on a side stream.
A hand valve controls water flow. The hand valve should be opened until the inlet pressure to the separator is about 10-20 psi as determined by the factory-installed gauge. This will yield about 15-30 gpm of blowdown whenever the blowdown solenoid opens.
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Figure 6: Corrosion Resistant
Figure 7: Easy Service Access
Walk In Service Compartment All routine refrigerant service can be performed inside
the walk-in service compartment away from compressor noise and outdoor conditions
Contains marine lights, electrical outlet, main control panel, spray pump, water connections, and optional water treatment system
A thermostat-controlled ventilation fan turns on at 75F and a manual shutter draws conditioned air into the service compartment for comfort. These features provide more comfort for service even in hot weather
A hose bib is provided as standard in the make up water line to aid in condenser cleaning
A drain pan under the water piping and a raised floor grate in the pan help keep the walking area dry
Optional unit heater for cold climate use No compressor noise is generated in the work area Sight glass, filter driers, solenoid valves and charging
valves are in the service compartment
Figure 8: Walk-In Service Compartment
Stainless Steel Spray Enclosure
PVC Spray Tubes
Stainless Steel Sump
Copper Tube Bundles
Polymer Tube Sheets
Stainless Steel Fan Decks with Severe Duty Motors and Corrosion-Resistant Fans
Walk In ServiceCompartment
Access Doorson Both Sides
Replaceable Nozzles with 150 Spray Arc Main Control Panel
Perform most refrigerant service in comfort, away from compressor noise.
Raised Floor Grate and Drain Pan
Charging, Suction, Discharge & Liquid Schrader Connections
Solenoid, Sight Glass & Filter Drier
Hot Gas Bypass Valves
Space for Water Treatment
Marine Lights Exhaust Fan
Optional Unit Heater
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Cabinet Weather resistant skin is made of pre-painted, galvanized
steel that successfully withstands a 750 hour salt spray test. The service compartment walls are double wall with R6.5 insulation sandwiched between the outer skin and inner liner. The air handler cabinet is also available with double-wall construction with R6.5 insulation
Full-sized, double-wall, hinged access doors are provided on each side of the section, complete with a single lever latch
Heavy gauge galvanized steel base with a formed recess sits on the gasketed curb and provides a weather-tight seal. The base also includes strategically placed lifting brackets to allow balanced cable or chain hook lifting
Air Handling Section Factory piped, charged and tested refrigeration system
comes complete with an aluminum fin, copper tube, DX coil with expansion valves and distributors. Each distributor tube is wrapped in plastic to help prevent refrigerant leaks
DX coils feature interlaced circuiting to keep the entire coil face active during all capacity steps and eliminate the air bypass associated with face split coil designs. An intermediate drain pan collects condensate from the top half of the coil. Drain tubes run from the intermediate drain pan to the sloped, galvanized [optional stainless] steel drain pan
High efficiency airfoil supply fans require less bhp and generate less noise than forward curved fans at the medium static pressures typical of large VAV units. Fans are available in both DWDI (housed) and SWSI (plenum) fan arrangements. For more information, refer to page 19
Insulated supply and return air plenums with bottom [optional horizontal] openings reduce ducted noise levels. A double wall option is available with perforated liners in these sections
Figure 9: Airfoil Fans
Electrical and Controls Single source power with optional, non-fused disconnect
switch with control panel door interlock Individual short circuit protection for each compressor,
supply fan and return fan motor. Condenser fan and exhaust fan motors are also provided with short circuit protection
All control panel wiring is labeled per the wiring diagram and all 115575 volt wiring is housed in conduit or metal raceways
Daikins Open Choices feature provides building automation system integration using BACnet MS/TP, BACnet IP, BACnet Ethernet, or LonTaLk communication protocol options. This allows any building automation system (BAS) to communicate with MicroTech III over an industry standard network and obtain access to the operating status, all set points, and alarms
LONMARK certified discharge air control (DAC) or space comfort control (SCC) communication options
BACnet compliant communication options MicroTech III is available in several temperature control
modes LONMARK certified Space Comfort Control [SCC] for single zone, constant volume applications; including 100% make-up air application
LONMARK certified Discharge air temperature control [DAC] for VAV or constant volume applications. Static pressure control of the supply fan and return/exhaust fan can also be included
Time clock, lead lag, morning warm up, night set back, economizer pre-cool and flexible reset are all standard
Published integration instructions for both forms of communication
Unit mounted keypad and 4-line by 20-character display provide an enhanced user interface
Compressor head pressure control that reliably cycles the condenser fans from sump temperature down to 45F ambient
Duct high pressure safety on all VAV units
Figure 10: MicroTech III Keyboard
faCTory InsTalled and WIred opTIons
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faCTory InsTalled and WIred opTIons
The RPE and RDE contain the same air handler construction and controls as the RPS and RDT units. For complete detail refer to RPS Catalog 214 and RDT Catalog 217. For a copy of these catalogs, contact your local Daikin representative or visit DaikinApplied.com.
Condensing Section Compressor spring isolation with suction and discharge
line vibration absorbers Extra compressor unloaders that provide 6 stages (size
76100) or 8 stages (size 110150) of capacity control Compressor part winding start to reduce inrush current Replaceable core filter driers Hot gas bypass on one or both refrigerant circuits Electric sump heater that helps prevent the sump from
freezing in cold weather. Heat tape is also included for the sump drain and supply water lines
1.5 kW electric unit heater and ambient ON-OFF thermostat for the service compartment
Air Handling Section Multiple fan and coil options optimize reliability, efficiency,
sound performance and first cost for varying cfm per ton operation. Units can be selected for make-up air applications
Economizer systems come standard with outdoor and return air damper leakage rates of less than 1.5 cfm/ft2 at 1" static pressure. Economizers are available with the following value add options
Patented DesignFlow minimum outdoor air measurement and control system that is independently certified to control ventilation air within +/- 5% of set point from 1,594 to 37,126 cfm of outdoor air
Static air mixers that provide optimum uniformity in mixed air temperature and reduce the chances of freezestat trips and localized coil freezing
Economizers are available with return or exhaust fans SWSI airfoil return fans provide better building pressure and ventilation control on ducted returns
Multiple propeller exhaust fans may save energy on low-pressure drop, ceiling plenum returns (see Economizer, Return Fan and Exhaust Fan Application on page 19)
Variable frequency RAF and SAF drives for VAV control (exhaust fans always include a variable frequency drive)
Supply and return fan belt guards Spring isolation (with optional seismic construction) Cooling coils are available in blow-through and draw-
through arrangements to optimize the use of fan and motor heat. See Figure 21 on page 22.
In blow-through arrangements (RPE only), fan energy pre-heats the mixed air temperature before entering the cooling coil, providing greater sensible capacity and colder supply air temperature for a given compressor capacity
In draw-through units, fan energy re-heats the air leaving the cooling coil. Draw-through systems provide greater latent cooling capacity, lower sensible heat ratios
Gas and electric heat are available on RPE units with the following options
Two-pass drum and tube heat exchanger with, fully modulating, FM approved burners for 3-to-1 or 20- to-1 (patented SuperMod) turn down and optional IRI approval. Drum and tube heat exchangers feature all stainless steel construction. Selections are available to handle up to 100F temperature rise
Low watt density, nickel chromium electric heaters with branch short circuit, automatic reset and manual reset safety
1 or 2-row hot water or jet distributing steam coils with optional valve control and optional freezestats
Supply fan sound attenuators with or without mylar coating of the acoustic insulation (RPE only)
Generous face area, 2" pleated, 30% efficient panel filters and/or 65 or 95% cartridge filters are available Cartridge filters can be in the final, last in air flow position for hospital or laboratory applications (RPE only)
Blank sections can be added for field-installed devices such as humidifiers and integral face and bypass coils
Ultraviolet Germicidal Irradiation (UVGI) lamps are available factory installed in all RDE/RPE units to cleanse cooling coils and drain pans. The UVGI lamps irradiate the cooling coil and drain pan surfaces with light in the 254-nanometer wavelength of the light spectrum (UV-C). UV-C light has been proved effective in killing most bacteria, molds and viruses in both laboratory and practical application. In addition, the continuous cleansing action of the UV-C light also serves to continuously clean the coil and drain pan, improving long-term performance and reducing coil/drain pan maintenance. Daikin equipment and UVGI lights include (ETL) safety agency certification
Figure 11: DesignFlow
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 12 www.DaikinApplied.com
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Intelligent Equipment Intelligent Equipment (IE) from Daikin Applied is a secure, cloud-based controls solution that enables delivery of equipment and/or system information to customers via web or mobile devices.
A power measurement module and communications gateway installed on Daikin equipment enables the unit to be directly connected to the Internet via wireless (cellular, WI-FI) or local area network (LAN), providing management, monitoring control analysis and decision-making functionality for Daikin rooftop systems and the facility.
Features Remote monitoring and control of Daikin rooftop units Remote servicing capabilities Integration to the Energy Star Portfolio Manager
Advanced data analytics including equipment performance, financial performance and building Comfort Index metrix based on ASHRAE Standard 55-2010
Dynamic user dashboards with photo-realistic graphics and responsive-design interface optimized for users mobile devices, tablets or PCs
Secure, role-based user access
Benefits Informed decision-making Increased equipment efficiency 24/7 monitoring capability Real-time equipment information Accelerated equipment payback Historical performance data Can be used with, or without, an existing building
automation system (BAS)
Figure 12: Intelligent Equipment Dashboards
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www.DaikinApplied.com 13 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
Daikin MictroTech III Rooftop Remote User InterfaceEach remote user interface is identical to its unit-mounted counterpart and offers the same functionality, including:
Touch sensitive key pad with a 4 line by 20 character display format
Digital display of messages in English language All operating conditions, system alarms, control
parameters and schedules are monitored
Features Can be wired up to 1,200 feet from unit for flexibility in
placing each remote user interface within your building Unit-mounted switch enables the remote user interface
during normal operation or the unit user interface for maintenance and service
Benefits Allows you to access the user interface for each unit from
one location, inside the building. Users need to learn one format because the remote user
interface is identical to the unit-mounted version.
Figure 13: Remote User Interface
Electrical and Controls Factory-powered service outlets complete with its own
disconnect, short circuit protection and ground fault protection
Smoke detectors in the supply and/or return air openings Marine lights in the supply and/or return/exhaust fan
Multiple Unit ApplicationsFor applications in which multiple units are connected in a common duct system, it is important to control all units from a common duct static pressure sensor and to control all operating units in unison. Centralized duct static pressure control can be accomplished through communication with the BAS network.
Field-Installed Roof Curbs Constructed in accordance with NRCA guidelines using
12-gauge galvanized steel Fits inside the unit base around the perimeter of the air
handling section and service compartment Duct frames are provided to allow duct connections to be
made to the curb before the unit is placed. The unit seals to the duct frames
Ship loose gasket seals between the unit and curb Separate condensing unit support rail allows an open
condensing unit design and minimizes compressor noise and vibration transmission through the roof
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 14 www.DaikinApplied.com
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Optional Water TreatmentAll evaporative condensing products require water treatment systems for proper operation. The water treatment system serves the following purposes:
Controls organic contamination Reduces condenser fouling and corrosion Reduces cleaning frequency and water usage
OverviewDaikin RPE/RDE units come with a spray system, pump, sump strainer, automatic float controlled intake, and manual blowdown as standard.
Daikin evaporative condenser rooftop systems can provide as much as 44% in compressor energy savings compared to competitive air-cooled rooftop units. Until now, chemical water treatment was required to prevent scale build-up and microbial growth in the moisture laden condenser section of these units. Daikin now offers an alternative: a chemical-free water treatment system that can substantially lower the cost of water treatment, eliminate the use of hazardous chemicals and simplify the water treatment process.
Figure 14: Water Treatment System
Eliminates Chemical CostsThis system eliminates the use of hazardous chemicals, including scale inhibitors, biocides and corrosion inhibitors. Typical yearly savings range from $1,800 to $2,700 per year for a 150 ton evaporative condenser rooftop unit.
Minimizes CorrosionDaikin uses only stainless steel, copper and PVC in its evaporative condenser plumbing. Clean, chemical-free water, saturated with precipitates by this system, does not attack these materials.
Blowdown and Water ConsumptionControlled blowdown is required on Daikin RPE/RDE units as it should be with all evaporative condensing products. It involves draining off a portion of the highly concentrated water from the bottom of the sump and replacing it with lower concentration make-up water to prevent scale. Scale protection is required because the evaporation process leaves behind solids (scale) that will coat the heat exchanger surfaces and sump. This reduces the capacity, efficiency, and life expectancy of the equipment.
Manual blowdown occurs whenever the spray pump operates and a manual valve adjusts flow. This inevitably bleeds off too much [increased water costs] or too little [risking scale build up] water. Controlled bleed off is included with the Daikin water treatment controller. The concentration of scale forming solids is measured by water conductivity and the control opens or closes a solenoid to allow the proper amount of bleed off. The conductivity set point should be adjusted based on water analysis to maintain a desired cycles of concentration.
Theoretical water consumption required for proper heat rejection is 1.8 gallons per ton hour. All of this water evaporates and none goes into the sewer. An additional 0.6 to 0.9 gallons per ton hour is also required for make up and blowdown. The exact amount should be determined by water analysis. The RPE/RDE includes a float valve and solenoid that automatically refills the sump as required.
Blowdown must be handled in accordance with local codes and normal procedures are as follows:
Daikin non-chemical water treatment system - used blowdown water often can be drained to the storm sewer (check local codes)
Field installed chemical water treatment system - used blowdown must not be drained to the storm sewer and is usually drained to the sanitary sewer (check local codes)
Because most water utilities charge for both intake and sanitary sewer water flows based on intake meter readings, sanitary sewer charges may be reduced if sewer flow is proven to be less than water intake. Daikin offers both intake and blowdown water meters to document reduced sewer flow [confirm details with your local utility]. These meters are not included in the basic water treatment option.
Reduces Water Consumption CostsWith this system, supply water typically can be cycled through the evaporative system six times before it must be drained off to prevent scale. With chemical treatment systems, only three to four cycles are possible. This represents a water consumption savings of about 10%.
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www.DaikinApplied.com 15 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
A Cleaner EnvironmentDaikin evaporative condenser rooftop units equipped with a chemical-free water treatment system contribute to a cleaner environment by reducing energy usage and by eliminating the introduction of hazardous chemicals into the waste stream.
Reduces Sanitary Sewer CostsSavings in sanitary sewer costs can be even more dramatic. Thats because this system requires no sanitary sewer usage all condenser water, including blow-down, usually can be drained to the storm sewer or used for irrigation (check local codes). This represents a 10 to 15% water cost savings if sewer flow is measured (i.e., credit is given for the water that evaporates during the cooling process) and even more if it is not.
Chemical-Free BenefitsAs a scale inhibitor, the Daikin chemical-free system uses pulsed electromagnetic fields to neutralize the charge on particles suspended in water, causing them to attract to each other rather than to form scale on plumbing and heat transfer surfaces. The particles grow, encapsulate any micro- organisms, and precipitate out of solution as a powder. A cyclone separator removes the powder from the system during the blow-down process. For microbial control, the system uses pulsed electromagnetic fields to attack the cell walls of any microorganisms that are not encapsulated. As a result, TBC is typically 75% less than with chemical treatment systems. In fact, total bacterial count (TBC) is so low that biofilms are normally prevented.
Easy MaintenanceThe Daikin chemical-free water treatment system has no moving parts and is easy to maintain. Inspection and monitoring are only required once or twice per quarter, as follows:
Check the water conductivity (and clean conductivity sensor if necessary)
Check total bacteria count (TBC) Inspect general operation and controller settings
LEED Point AvailableChemical-free water treatment systems qualify for a LEED point under the Innovation heading, per a Credit Interpretation Request posted on the USGBC website.
12 to 18 Month PaybackThe superior performance of the Daikin chemical-free system costs a little more up front than a chemical feed system, tanks, and pumps. However, the water and chemical savings generally provide a 1218 month payback, in addition to the financial benefit of cleaner water and heat transfer surfaces.
Table 6 below shows typical yearly water treatment cost savings when using this system on a Daikin 150-ton evaporative condenser rooftop unit.
Table 7 points out that, while there are water treatment costs associated with evaporative condensers, they are typically small compared to the total energy savings provided by a Daikin evaporative condenser unit.
Table 5: Yearly Cost SavingsLos Angeles New York City
Typical Chemical Treatment SystemWater Cost $1,067 $628Chemical Cost $2,000 $2,000Total $3,067 $2,628Daikin Chemical Free Treatment SystemWater Cost $923 $539Chemical Cost $0 $0Total $923 $539Chemical-Free Savings $2,144 $2,089Percent Savings 70% 79%
Table 6: Yearly Cost Savings with Rooftop UnitLos Angeles New York City
Competitive Air Cooled UnitEnergy Cost $30,200 $17,860Water Treatment $0 $0Total $30,200 $17,860Daikin RPE Unit with Chemical Free Treatment SystemEnergy Cost $22,100 $12,375Water Treatment $923 $539Total $23,023 $12,914RPE Cost Savings $7,177 $4,469Percent Savings 24% 28%
NOTE: All energy analysis and comparison charts provided above are estimates and have been generated using Daikin Energy Analyzer software. Actual customer results may vary. For access to the Daikin Energy Analyzer software, contact your local Daikin sales representative.
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 16 www.DaikinApplied.com
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Figure 15: Daikin Water Treatment Option
Makeup water control valve
Heat-tape all components from customer connection point to makeup water control valve
Makeup water coil-pipe treatment module
Makeup water connection point to sump tank.
Side stream connection to sump tank
Customer makeup water connection point
Blow down and drain
Auto purge controller
Makeup water transformer
System drain valve and actuator
Cyclone seperator hand valve (hidden)
Ball valve actuators for blowdown
Sump water coil-pipe treatment module
Sump water transformer
www.DaikinApplied.com 17 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
The RPE and RDE require many of the same application considerations as Daikin RPS and RDT units. More detail is provided in RPS Catalog 214 and RDT Catalog 217. For a copy of these catalogs, contact your local Daikin representative or visit DaikinApplied.com
General Intended for normal HVAC use. Consult factory if
cataloged operating range is exceeded, such as make up air. Compressor cooling below 45F is not allowed
Rig the unit in accordance with the instructions provided in the Installation Manual IM 791. Split units are available to reduce rigging weight and may be required if the total length exceeds 52 ft. For a copy of IM 791, contact your local Daikin representative or visit DaikinApplied.com
Fire dampers may be required by code. They are not included
Qualified Start-up of the unit in accordance with the IM 791 is required
Clean off any road chemicals, such as winter salt, when the unit is received
Proper water treatment must be provided before unit start-up
Location and Curb/Rail Support The structural engineer must verify that sufficient roof
strength is provided Maximum unit pitch is 1/16 in. per foot. Curbs or
supporting rails must be rigidly supported along the entire length of the unit to prevent deflection that results in door interference
Gaskets must be installed between the curb and the unit, per IM 791
Curbs must be installed per NRCA guidelines See Roof Curbs on page 55
Avoid locating the unit near any heat source, exhaust, smoke stack, or any source of air-borne particles or chemicals
Local codes must be followed regarding fastening the unit to the curb/rail and the curb/rail to the building. This is especially critical in higher risk, hurricane or seismic zones
Refer to the Acoustics on page 18 to avoid noise and vibration problems
Daikin curbs include supply and return opening support frames and perimeter channels that seal to the unit as it is placed on the curb. Therefore, duct connections can be made to the curb before the unit is placed
Filters Filters should be replaced on a regular basis to avoid
excessive pressure drop increases, especially on high efficiency cartridge filters
Fan selection must consider dirty filter losses. Using a filter pressure drop midway between clean and dirty values is recommended unless maintaining minimum cfm is critical
Daikin RPE units offer last in air stream final filters. They require special consideration
The Daikin design uses full double-wall construction down stream of the final filters
Cooling coils must be in the draw-through position. Final filters down stream of gas and electric heaters must
be rated for 500F temperatures. Maintenance personnel must use properly-rated replacement filters
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 18 www.DaikinApplied.com
AcousticsDucted and radiated sound power ratings are available from your local Daikin sales representative. The designer is responsible for addressing these sound levels. The following guidelines will help to achieve the desired sound levels in the occupied space.
Locate the unit as far away from sound sensitive areas as possible. Refer to the Location and Curb/Rail Support on page 17
Minimize supply and return fan TSP and select the fan as close to peak efficiency as possible. Avoid the do not select areas on the fan curve. Daikin offers several different fans per model size to allow for various design conditions. Refer to Fan Performance Data on page 44
Three different sound paths from the unit to occupants and/or neighbors must be considered:
1. Radiated path
Use a concrete deck or pad when the unit must be located over sound sensitive areas. If this isnt possible, provide extra acoustical insulation under the condensing unit
Only the supply and return ducts, and the essential plumbing and electrical connections should penetrate the acoustical insulation or roofing below the unit. The outside perimeter of the ducts must be sealed after they are installed
If a built-up roof with metal decking is used, then the area inside the curb perimeter requires special attention:
Provide an inverted 6" channel around the inside perimeter of the curb and seal to the curb
Acoustical insulation must be installed above the decking and the 6" channel
2. Vibration path
Locate the units center of gravity close to a main support beam to minimize roof deflection and vibration transmission into the building
Daikin offers 2" deflection, supply and return fan spring isolation or rubber in shear isolators. The rubber in shear isolators should only be used when vibration isolation is clearly not required in the rooftop, such as when the unit is mounted on spring isolated curbs, spring isolated rails or the ground
Daikin offers compressor spring isolation, including the necessary refrigerant line vibration eliminators
Internal spring isolation options may be insufficient for some applications. Spring isolation of the entire unit may be required
3. Air-borne path through the supply and return openings
Use 2003 ASHRAE Fundamentals Chapter 43 to help reduce ducted noise and minimize duct turbulence. Maintain straight ducts to and from the unit and avoid abrupt changes in duct size and direction. Avoid turns opposed to the fan wheel rotation. If 90 elbows are required, use turning vanes
Use as much insulated return duct as possible and include at least one elbow and 15' of length. Maximum recommended velocities are 10001200 fpm
Allow for duct break out and use oval or round duct whenever possible
Insulate the first 20' of supply duct. The first 20' of rectangular duct should be routed over non-sensitive areas and avoid large aspect ratios. Maximum recommended velocities are 18002000 fpm
Daikin offers factory-installed discharge plenums with optional perforated liners. The plenum provides several dB of attenuation and discharges the air at a more uniform, relatively low velocity. Ducted supply noise can be further reduced by adding optional sound attenuators between the supply fan and the unit discharge
Route the return air path through the length of the curb to add distance between the unit return opening and the building return opening
www.DaikinApplied.com 19 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
Economizer, Return Fan and Exhaust Fan ApplicationRooftop economizer applications usually require return or exhaust fans to properly control building pressure and maintain minimum ventilation. Daikin offers both exhaust and return fan capability. They are not generally interchangeable for a given design. In general:
Return air fans (RAF) should be used on ducted return systems (return ESP exceeds 0.40.5 in.)
Properly selected propeller exhaust air fans (EAF) can successfully operate and save energy on open return systems (return ESP is less than 0.40.5 in.)
Supply air fan (SAF) selection depends on whether a return or exhaust fan is used
RAF system-SAF handles only the supply ESP at design
EAF system-SAF handles both the supply and return ESP at design (EAF is OFF)
Figure 16 illustrates why supply fan only units have problems, especially as return ESP increases.
No exhaust will occur from the rooftop because the economizer section must be at a negative pressure
The air balancer must adjust the outdoor air damper to generate large pressure drops at minimum ventilation settings (about 0.9" in Figure 16)
Figure 17 illustrates how the addition of a return fan corrects these problems. The return fan is responsible for return system ESP and maintains a slightly positive pressure in the economizer section (about +0.1 in. in Figure 17) to allow for exhaust air control and a more suitable outside air intake pressure.
Exhaust fans are very different than return fans and can not maintain proper building pressure and ventilation control as return ESP increases.
The EAF is normally off during non-economizer operation. During these minimum outdoor air conditions, the system essentially acts like a supply fan only system
When the exhaust fan cycles OFF, there is no device available to maintain a positive pressure for relief, the mixed air plenum pressure dramatically changes and minimum ventilation air control and space pressure control are lost
An exhaust fans performance weaknesses diminish as return ESP decreases. Properly selected and controlled propeller exhaust fans can successfully operate and save energy at reduced return ESP designs.
At system operating conditions where a single fan can be used successfully, it generally will be more efficient than operating series fans under the same total load. When the exhaust fan turns off, the supply fan can more efficiently handle both the supply and return duct loads
At the relatively high cfm, low static pressure conditions of exhaust/return application, exhaust fans can be selected closer to their peak design efficiency than can full return fans. This allows them to run more efficiently throughout their operating range. Therefore, when return duct losses dont dictate the use of a return air fan, exhaust fans are an efficient alternate.
Figure 16: AF Only System Static Pressures with 1" Return Duct ESP
Figure 17: RAF System Allows Proper Exhaust and Outdoor Air Control
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 20 www.DaikinApplied.com
Variable Air Volume (VAV)Daikin Rooftop VAV options include everything required to provide the full advantages of true shut-off VAV. Bypass VAV systems do not offer any fan energy savings at light load.
Variable Frequency Drives for all indoor fans maximize part load fan efficiency and minimize fan sound generation
Indoor fan volume control based on supply static pressure and building pressure
Up to 2 supply duct sensors to properly respond to building diversity (such as east-west variation)
Constant discharge temperature control. Shut-off VAV offers the following advantages
Reduces first cost and energy due to building diversity Reduces indoor fan energy requirements at light load Provides the opportunity for efficient multiple zone control
from a single unit and to match changing occupancy demands
VFDs turn down in accordance with Figure 18
The benefits of Daikin airfoil fans are particularly applicable to VAV applications.
Better efficiency and less noise at the medium static pressures associated with VAV
Airfoil fans are much more forgiving than forward curved fans if unexpected variations in ESP occur
They are non-overloading (bhp is fairly constant for a given RPM) and require less safety factor in motor selection
They have steeper RPM lines (less variation in cfm for a given variation in ESP)
Multiple forward curved fans are often used and they risk unstable fan paralleling at light load
Figure 18: VFD Turndown
MicroTech III ControlSupply fans are controlled to maintain constant supply duct static pressure.
Run pressure-sensing tubes to the desired location (generally at the end of the main trunk)
Use a second sensor when there is more than one main trunk, multiple floors, or significantly varying zones (such as east and west sides of a building)
Return/exhaust fans are controlled to maintain building pressure in one of two ways.
Daikins exclusive Vanetrol supply/return fan tracking is generally preferred. Vanetrol is adjusted at system air balance to maintain proper building pressure throughout the expected loading conditions. This reduces the effect of wind, climate variation and doors opening and closing
Direct building sensing control is available for exhaust fans or any return fan application that cannot predictably track the supply fan
Daikin generally offers more steps of compressor capacity control than the industry norm, as well as HGBP, and these capabilities should be included on VAV applications to minimize variations in duct temperature.
www.DaikinApplied.com 21 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
Unit Operating RangeFan Operating RangeThe acceptable system operating range of the Daikin rooftop unit is determined by all of the following characteristics. Each of these limiting factors must be considered for proper performance and component design life.
1. Unstable fan operation
2. Maximum fan rpm
3. Maximum cabinet static pressure
4. Maximum face velocity (cooling coil is most important)
5. Minimum furnace or electric heater velocity
6. Turndown capability on VAV applications
7. Compressor operating pressures
Figure 19 illustrates these limiting factors with the exception of items 6 and 7 above. The shaded area indicates the design operating range of the fan. For optimal efficiency, select fans as close to the fans peak static efficiency line as possible. This line is the first system curve to the right of the unstable line illustrated. VAV fan selections must also allow for keeping the fan away from the do not select area at minimum design cfm.
Cooling coil maximum face velocity is based on moisture blow off limitations and laboratory testing.
650 feet per minute maximum face velocity for 8 and 10 fin per inch coils.
600 feet per minute maximum face velocity for 12 fin per inch coils.
Cooling coil minimum face velocity is 200 feet per minute for any coil selection. VAV systems must be designed such that this velocity is maintained at minimum airflow.
Maximum design ambient wet bulb temperature varies per unit, but is at least 85F. Evaporative condenser units are an excellent choice for high ambient applications.
The minimum ambient temperature for compressor operation is 45F. The MicroTech III Controller is set to prevent compressor operation below that temperature and use the economizer only when cooling is required at a lower ambient.
Figure 19: Fan Selection Boundary
Do Not Select
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 22 www.DaikinApplied.com
Indoor Fan and Motor Heat, Blow-Through vs . Draw-Through CoolingIndoor Fan and Motor Heat
The indoor fan and motor electrical consumption is a sensible cooling load approximately equal to 2.8 MBh per bhp (depending slightly on motor efficiency). This occurs at the fan. See Figure 20 and Figure 21. The fan and motor preheat the mixed air before it enters a blow-through cooling coil. The fan and motor reheat the air leaving a draw-through cooling coil. Refer also to 2001 ASHRAE Fundamentals Handbook, Chapter 31
Fan and motor temperature rise is equal to Btuh / (1.08 cfm) and is typically about 3F
Due to fan and motor heat placement (Figure 20), blow-through coils provide a high sensible heat ratio while draw-through coils provide more latent cooling per total ton. Blow-through coils achieve a higher sensible heat ratio because they operate with a higher coil approach temperature and a lower entering relative humidity. Conversely, draw-through coils cool air at a lower approach temperature and a higher relative humidity, increasing latent cooling
Blow-through coils effectively provide colder supply air temperatures per ton of air conditioning and greater sensible heat ratio. This potentially allows a significant reduction in design cfm for buildings with high sensible heat ratios and a resulting reduction in building energy use
Figure 20: Blow-Through vs. Draw-Through Concept
Figure 21: Blow-Through and Draw-Through Performance Comparison
3 D .T .Reheat
3 B .T .Preheat
Coil EAT IsDifferentCoil LAT Is
www.DaikinApplied.com 23 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
Recommended ClearancesService ClearanceAllow the recommended service clearances shown in Figure 22. Provide a roof walkway along two sides of the unit for service and access to most controls.
Cooling Coil, Heat, and Supply Fan Service ClearanceAn additional clearance of 24" is recommended adjacent to the cooling coil, heat, and supply fan sections.
Overhead Clearance1. Unit(s) surrounded by screens or solid walls must have
no overhead obstructions over any part of the unit.
2. The area above the condenser must be unobstructed in all installations to allow vertical air discharge.
3. The following restrictions must be observed for overhead obstructions above the air handler section:
a. There must be no overhead obstructions above the furnace flue or within 9 inches of the flue box.
b. Any overhead obstruction shall not be within 2 inches of the top of the unit.
c. A service canopy must not protrude more than 24 inches beyond the unit in the area of the outside air and exhaust dampers.
d. Flue box outlet must extend above any obstructions.
Outdoor Air IntakesDo not locate outside air intakes near exhaust vents or other sources of contaminated air.
If the unit is installed where windy conditions are common, install wind screens around the unit, maintaining the clearances specified. This is particularly important to prevent blowing snow from entering outside air intakes.
Figure 22: Service Clearances
72" Service Clearance on4 sides except as indicated
72" Clearance toend of unit or endof outside hood
Adjacent to Cooling Coil, Heat, and Supply Fan Sections.
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 24 www.DaikinApplied.com
Ventilation ClearanceUnit(s) surrounded by a screen or a 50% open area fence:
1. The bottom of the screen should be a minimum of 1 ft. above the roof surface.
2. Minimum distance from the unit to screen is the same as the recommended service clearance.
3. Minimum distance, unit-to-unit = 120 in.
Unit(s) surrounded by solid walls:
1. Minimum distance from the unit to the wall is 96 inches for all sizes.
2. Minimum distance from the unit to another unit is 120 inches.
3. Wall height restrictions:
a. No restrictions if there is a wall on one side only, or on two adjacent sides.
b. The wall height is restricted to no more than the unit height with walls on more than two adjacent sides.
Figure 23: Ventilation Clearances Maximum AllowableOverhead Canopy Area
9" Min to Flue BoxTypical All Sides
2" Top of UnitTo OverheadObstruction
www.DaikinApplied.com 25 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
Control and Power WiringWiring must be done in accordance with the NEC and local code. For wire sizing instructions, see Supply Power Wiring on page 60.
All units require 208-60-3, 230-60-3, 460-60-3, 575-60-3 or 380-50-3 power.
Size wire in accordance with tables 310-16 or 310-19 of the National Electric Code. Wires should be sized for a maximum 3% voltage drop. Copper conductors must be used.
Actual voltage at the unit connection must be within +/- 10% of nameplate voltage at all times.
Daikin offers several power connection options. Single power connection with a terminal block or non-
fused disconnect are normally the most economical. Systems served by emergency generators often require
two power connections (with terminal blocks or non-fused disconnects). The generator normally serves only the air handler and controls portion so the condensing unit must be powered separately.
Each unit is provided with a separate 115 volt convenience outlet that requires a separate power connection per the NEC.
A second, 115 volt power supply is required to power the optional unit heater for the service compartment.
Most units require a zone temperature sensor for night heat and other functions. The sensor must be properly placed so that its temperature reflects the zone requirements. Avoid outside walls, sunlight and close proximity to supply air or heat generating equipment. A return air sensor can be substituted for the space sensor if necessary.
Altitude AdjustmentsFan curve performance is based on 70F air temperature and sea level elevation. Selections at any other conditions require the following adjustment for air densities listed in Table 7. Higher elevations generally require more RPM to provide a given static pressure but less bhp due to the decrease in air density.
1. Assume 32,000 cfm is required at 3.11" TSP. The elevation is 5000 ft. and 70F average air temperature is selected. A 40" DWDI airfoil fan is selected.
2. The density adjustment factor for 5000 ft. and 70F is 0.83.
3. TSP must be adjusted as follows; 3.11" / 0.83 = 3.75"
4. Locate 32,000 cfm and 3.75 on the fan curve. RPM = 900 and bhp = 27.5. The required fan speed is 900 RPM.
5. The consumed fan power at design = 27.5 bhp 0.83 = 22.8 bhp.
Figure 24: RPE 105C - 135C 40 in. DWDI Airfoil
Table 7: Temperature and Altitude Conversion FactorsAir
0 1000 2000 3000 4000 5000 6000 7000 8000
-20 1.20 1.16 1.12 1.08 1.04 1.00 0.97 0.93 0.890 1.15 1.10 1.08 1.02 0.99 0.95 0.92 0.88 0.85
20 1.11 1.06 1.02 .098 0.95 0.92 0.88 0.85 0.8240 1.06 1.02 0.98 0.94 0.91 0.88 0.84 0.81 0.7860 1.02 0.98 0.94 0.91 0.88 0.85 0.81 0.79 0.7670 1.00 0.96 0.93 0.89 0.86 0.83 0.80 0.77 0.7480 0.98 0.94 0.91 0.88 0.84 0.81 0.78 0.75 0.72
100 0.94 0.91 0.88 0.84 0.81 0.78 0.75 0.72 0.70120 0.92 0.88 0.85 0.81 0.78 0.76 0.72 0.70 0.67140 0.89 0.85 0.82 0.79 0.76 0.73 0.70 0.78 0.65
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 26 www.DaikinApplied.com
Furnace Performance Gas heat performance data is based on standard 70F
combustion air temperature and zero feet altitude (sea level).
Furnace altitude derate may be 4% per 1000 feet above 2000 feet due to lesser combustion air density.
However, if design ambient is cold enough, then the combined affect of colder temperature and altitude may have an offsetting impact on combustion air density.
Example:A 1000 MBh furnace at 70F ambient and at an altitude of 5000 feet is derated (0.04 3 = 0.12). At 1000 MBh input (1000 0.12 MBh), the actual input is (1000 120 = 880 MBh) at 5000 feet. Above 6000 feet, consult factory.
Freezing ConcernsFreeze protection measures must be taken for any rooftop exposed to freezing conditions. The owner and building designer must take primary responsibility based on the exact climate and installation conditions.
Drain all condenser water as soon as the climate allows the economizer to provide all required cooling.
The optional sump heater is recommended to protect the sump if ambient temperatures can drop to freezing conditions (even at night).
Spray SystemThe spray tree and nozzles are not vulnerable to freezing because water drains out of them when the spray pump is OFF. Remove the sump drain plug whenever the unit is not in operation to prevent precipitation from building up in the sump and drain.
Two freeze protection options are required to prevent the rest of the spray system from freezing.
1. An optional service vestibule heater provides primary freeze protection of the spray system enclosed in the vestibule. A thermostat turns the unit heater on when vestibule temperature drops to 40F.
2. A sump heater is a recommended option that includes the following:
An ambient thermostat-controlled insertion heater for the sump.
Heat tape, insulation and thermostat for the sump drain.
Heat tape, thermostat and insulation is included on the high pressure, factory water inlet piping upstream of the float control valve. An additional 10 feet of heat tape is provided to protect field connections. The installer must provide additional heat tape as required and insulate all field piping.
An emergency drain solenoid opens up whenever the sump temperature drops near freezing and the spray system drains onto the roof.
Hot Water and Steam CoilsThe RPE/RDE economizer offers better mixing capability than competitive rooftops but it cannot protect a hydronic coil from localized freezing. Optional air mixers are available to reduce air stratification and freezing concerns.
Glycol is strongly recommended for hot water coils. It is the only reliable protection in the event of a power failure. Glycols impact on coil and pump performance must be considered.
An optional, non-averaging coil freezestat is offered on the downstream face of the heating coil. The outdoor dampers are shut, the fan is shut off, and the heating valve is fully opened, if freezing temperatures are experienced. The freezestat must be set somewhat above freezing temperatures to improve protection and may experience nuisance trips. It can not protect the coils during a power outage.
Freeze protection strategies must not cause the cabinet temperature to exceed 150F or motors and electrical equipment may be damaged.
The field installed supply and bleed off water lines can enter the unit through the floor, inside the curb perimeter. This may provide sufficient protection depending on the temperature inside the curb. Use freeze protection if there is any concern the temperature inside the curb may fall below freezing. If no curb is provided, or field water piping enters the side of the unit, then additional measures are required such as heat tape and proper pipe insulation.
Hot water and steam coil piping can enter the floor of the unit in the heat section and requires similar consideration.
Water TreatmentAll evaporative condensers require proper water treatment. See Optional Water Treatment on page 14.
The purpose of the water treatment system is to:
Control organic contamination. Reduce condenser and sump scaling, fouling and
corrosion. Reduce the required cleaning frequency.
Proper water treatment involves two mandatory components (treatment and bleed off) and may also require a solid separator system depending on water quality.
www.DaikinApplied.com 27 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
Condenser Water ConnectionsSupply and return condenser water piping, plus field connections for chemical water treatment, are shown in Figure 25. Supply water can enter the floor of the service vestibule. Space is allowed in the vestibule for chemical tanks. Condenser bleed off (or return) connections allow easy drainage to a sanitary sewer through the floor of the vestibule.
The spray operation washes particles out of the condenser air and condenser heat rejection evaporates water. This process leaves behind minerals and particles that were contained in the water. Water bleed off and water treatment are required to prevent the build up of scale, sludge and micro-organisms on the tube bundles and in the sump. These must be installed prior to unit start-up. See Optional Water Treatment on page 14.
The theoretical water consumption required for proper heat rejection is 1.8 gallons per cooling ton hour. A nominal 100- ton unit, running at 50% capacity or 50 tons, evaporates 90 gallons of water per hour while rejecting condenser heat.
Additional water must be added to the sump and bled off to the sanitary sewer to remove particles and minerals that accumulate in the water during operation. The required amount of bleed off varies with the water quality and is generally 0.6 to 0.9 gallons per ton hour or 33-50% of the theoretical evaporation water. Bleed off can be controlled in two ways.
The RPE/RDE is provided with a manual shut off valve that can be used to adjust for a constant flow rate of bleed off water. This standard bleed off system can easily bleed off too much or too little water.
Controlling bleed off with a solenoid valve, based on water conductivity or some other measure of particle concentration should be used. It is included in the RPE/RDE water treatment option.
The RPE sump also has a float control that automatically opens the supply water solenoid and replaces water lost in evaporation and bleed off.
Water utility costs are usually based on the combination of water usage and sewer discharge. Only the bleed off portion of the water used by an evaporative condenser drains to the sewer (about 25-33% of total water used). Therefore, the sewer component of the cost of water may be reduced significantly if approved water meters are installed in the intake and bleed lines. The difference in meter rates reflects evaporation (water that will not go to the sewer) and this can be applied as a credit to the total water bill. Consult your local water utility for details.
Figure 25: Condenser Water Piping and Connections Water Consumption
Optional FreezeProtection DrainValve
Field Bleedoffor DrainConnection
Hose Biband ManualShut offValve
RecommendedWater PipingEntranceThrough theCurb
AutomaticSupply Water Valve(Float Controlled)
Sump Drain LeftOpen for Shipment
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 28 www.DaikinApplied.com
Selection InstructionsBuilding design and unit selection must allow for code compliance and installation limitations. The Daikin Rooftop unit offers excellent flexibility to meet diverse application requirements.
This catalog includes summary performance tables at several operating conditions. Performance at other conditions can be estimated by interpolation but accuracy may suffer. Extrapolation often results in unreliable or damaging operating conditions and should not be used without factory guidance that is available through your local sales representative. Contact your Daikin representative for custom selections at specific design conditions.
Selection ExampleSelection based on design criteria:
38,000 supply cfm at 2.00" ESP 36,000 return cfm at 0.75" ESP Sea level location using 60 Hertz power 95/75F cooling ambient temperature 80/67F cooling mixed air temperature [MAT]
Total cooling loads requirements:
115 total tons 87 sensible tons
Total sensible loads allow for:
50 hp SAF motor 25 hp RAF motor
Gas furnace requirements:
1520 MBh of design heating 9" gas pressure available at the unit Furnace to only be used at design cfm for morning warm
up and night heat An RPE unit must be used since a furnace, or electric
heat, or final filters are required.
Economizer plus return fan 65% filters plus pre-filters
Cooling SelectionGross and net coolingThe tables within the section Cooling Capacity Data on page 32 provide gross cooling or DX coil capacity based on DX coil entering air temperature (EAT).
Net unit cooling capacity = [Gross cooling capacity] - [fan/motor heat]
Fan/motor heat is critical. Refer to Indoor Fan and Motor Heat, Blow-Through vs. Draw-Through Cooling on page 22.
Fan/motor heat = 2800 Btuh per bhp
Fan/motor temperature rise (TR) = Btuh / (1.08 cfm)
Mixed air vs . entering air temperature [MAT vs . EAT]Draw-through coil EAT = MAT
Blow-through coil EAT = MAT + TR
Blow-through EDB = mixed air EDB + TR
Use a psychometric chart to find blow-through EWB.
Selection From Capacity TablesBlow-through vs. draw-through. Refer to Indoor Fan and Motor Heat, Blow-Through vs. Draw-Through Cooling on page 22.
Required sensible heat ratio < 80% [87 / 115 = 76%]
An RPE is required due to the gas heat requirement. Therefore a draw-through RPE will be considered first.
The RPE unit is available with both a low and high airflow DX coil. Refer to Table 8: Physical Data, RPE/RDE 076C - 150C on page 31.
First select a high and low airflow coil with sufficient capacity. The RPE 110 with high airflow coil has sufficient capacity.
No low airflow coil has sufficient capacity.
Check coil velocity on all possible selections.
High airflow face area = 76.0 square feet face velocity = 526 feet per minute.
Low airflow face area = 60.8 square feet face velocity = 658 feet per minute
The low airflow velocity is too much per Unit Operating Range on page 21.
The RPE 110 [with high airflow coil] is sufficient per Table 16 on page 35.
RPE 110 provides 117.6 total tons.
RPE 110 provides 90.8 tons of sensible capacity.
RPE 110 power consumption.
90.0 compressor kW (see Table 16 on page 35).
4.0 condenser fan and pump kW (see Table 20 on page 37). RPE 110 fan and motor heat must still be verified to be less than 50 = 25 bhp [per fan selection] to be sure that net cooling capacity is sufficient.
www.DaikinApplied.com 29 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
Heat SelectionSee Catalog 214 or 217 for hot water, steam and electric heat selection instructions.
Furnace SelectionSee Table 24 on page 40 and Table 25 and Table 26 on page 41.
Table 24 and Table 25 indicate all of the furnace output capacities available.
Output capacity is the true measure of furnace capacity
Output capacity = Input capacity furnace efficiency
Furnace efficiency = 80% for Daikin furnaces [similar to most direct fired furnaces]
Net unit heating capacity =
Furnace heating capacity + fan/motor heat =
Furnace heating capacity + (50 + 25) 2800 =
Furnace heating capacity + 210,000 Btuh
Net heating capacity must satisfy the heating load of 1520 MBh. A 1400 MBh furnace is the correct choice.
1,400,000 Btuh + 210,000 Btuh exceeds the 1,520 MBh requirement.
Assuming actual bhp exceeds (1,520,000 - 1,400,000) / 2800 = 42.9 bhp
Baffle selection is based on design airflow and Table 22 on page 38.
Baffle A has the greatest air pressure drop.
Use baffle A from 21,000 to 37,999 cfm.
Baffle B has the next greatest air pressure drop.
Use baffle B from 38,000 to 38,999 cfm.
Furnace air pressure drop at design air flowRefer to Table 24 for a 1400 MBh furnace with B baffle.
0.86" = furnace air pressure drop.
Minimum inlet gas pressureRefer to Table 25 for a 1400 MBh furnace. Minimum inlet gas pressure = 8.8" for the standard modulating burner.
5.0" for the 20:1 high turndown, modulating burner.
Furnace air temperature rise = Output Btuh 1,400,000 / 1.08 cfm = 32.4F
Filter SelectionRefer to Table 8: Physical Data, RPE/RDE 076C - 150C on page 31 and Table 29: Component Pressure Drops on page 43.
Table 8 shows the filter face area options.
Table 29 shows performance data for each filter option:
Clean filter air pressure drop Maximum airflow
Selection for 65% filter at 38,000 cfm per Table 29.
The medium airflow option is required Clean air pressure drop = 0.65" 30% prefilter clean air pressure drop = 0.36"
Maximum recommended, dirty filter pressure drop [PD] for these filters:
0.7" for the 30% prefilter 1.0" for the 65% filters
Please note that 95% filters are not part of this selection. 95% filter, maximum recommended, dirty PD = 1.20".
Average filter PD = (0.7 + 1.0 + 0.65 + 0.36) / 2 = 1.35"
Daikin generally recommends selecting the supply fan based on average filter PD.
This allows airflow to best match specifications. Adjustments can be made to maintain critical, minimum airflow.
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 30 www.DaikinApplied.com
Fan SelectionRefer to the following: Table 8: Physical Data, RPE/RDE 076C - 150C on page 31 and Table 29: Component Pressure Drops on page 43. Fan Operating Range on page 21. Fan Performance Data on page 44.
Return Air Fan and Exhaust Air Fan SelectionRefer to Return Fans & Exhaust Fans on page 44 for 36,000 cfm at 0.75" ESP. The 44" SWSI return fan performance requires 19.5 bhp at 810 RPM. 19.5 bhp satisfies the RAF bhp specification.
Supply Fan SelectionThe unit is specified to have a return fan.
Therefore the supply fan must only handle internal APD and supply duct ESP.
See Economizer, Return Fan and Exhaust Fan Application on page 19.
Internal APD per Table 28 on page 42 and Table 29 on page 43.
Economizer with return fan = 0.52"
High airflow, 12 fpi, DX coil air pressure drop = 0.80" Gas furnace = 0.86"
Average filter air PD = 1.35"
TSP = 0.52 + 0.80 + 0.86 + 1.35 + 2.00 ESP = 5.54"
SWSI Plenum vs . DWDI Supply Fan SelectionEach type should be considered based on maximum efficiency and customer preference.
DWDI fans are available on RPE, blow-through or draw-through units and must be used due to the furnace requirement.
SWSI fans are only available on RDE, draw-though units.
No blow-through coils or filters No furnaces or electric heat They offer advantages with side discharge
Pick the optimum SAF for 38,000 cfm and 5.54" TSP
40" DWDI = 47.8 bhp and 1085 RPM (Figure 37 on page 46)
36" DWDI = 50.1 bhp and 1288 RPM (Figure 36 on page 46)
33" DWDI = do not select
The 40" fan is superior.
5% more efficient and, therefore, quieter Saves a motor size Meets the 50 hp supply fan allowance
We can now verify acceptable net heating and cooling capacities.
Actual supply and return fan bhp = 47.8 + 19.5 = 67.3
Acceptable for cooling (67.3 < 50 + 25)
Acceptable for heating (67.3 > 42.9)
www.DaikinApplied.com 31 CAT 219-2 ROOFPAK PACKAGED SYSTEMS
Table 8: Physical Data, RPE/RDE 076C - 150C
076C 089C 100C 110C 130C 140C 150CNominal Capacity (tons)1 79.2 89.4 98.9 119.3 130.8 141.9 152.5Nominal Airflow (cfm) 32000 35000 35000 42000 45000 46000 46000
Type ReciprocatingQuantity - hp 2-30 2-35 2-40 4-25 4-30 2-30, 2-35 4-35Std. capacity control 100-83-67-33-0 100-75-50-25-0 100-72-44-22-0 100-75-50-25-0
Opt. capacity control 100-83-67-50-33-16-0 100-88-75-63-50-38-25-12-0 100-89-79-61-44-32-22-11-0100-92-83-67-50-42-33-16-0
Condenser Fans No. - Dia. (In.) 4-26 4-26 4-26 6-26 6-26 6-26 6-26Condenser Fan Motors No. - Hp 4-1.5 4-1.5 4-1.5 6-1.5 6-1.5 6-1.5 6-1.5
Type SWSI AirfoilNo. - Dia. (In.) 1-44, 49Motor hp range 5 - 75Type DWDI AirfoilNo. - Dia. (In.) 1-33, 36 1-33, 36 1-33, 36 1-36, 40 1-36, 40 1-36, 40 1-36, 40Motor hp range 5-75 5-75 5-75 5-75 5-75 5-75 5-75
Return FansType SWSI AirfoilNo. - Dia. (In.) 1-44.5 1-44.5 1-44.5 1-44.5 1-44.5 1-44.5 1-44.5Motor hp range 5-60 5-60 5-60 5-60 5-60 5-60 5-60
Type PropellerDiameter (In.) 36 36 36 36 36 36 36Quantity 2-3 per unit 2-3 per unit 2-3 per unit 2-3 per unit 2-3 per unit 2-3 per unit 2-3 per unitMotor hp 5 each 5 each 5 each 5 each 5 each 5 each 5 each
Rows 3, 4, 5 3, 4, 5 3, 4, 5 3, 4, 5 3, 4, 5 3, 4, 5 3, 4, 5FPI 8, 10, 12 8, 10, 12 8, 10, 12 8, 10, 12 8, 10, 12 8, 10, 12 8, 10, 12F.A., small (sq. ft.) 53.9 53.9 53.9 60.8 - - -F.A., large (sq. ft.) 60.8 60.8 60.8 76.0 76.0 76.0 76.0
Hot Water Coils
Type - Rows 5WH-1 5WH-1 5WH-1 5WH-1 5WH-1 5WH-1 5WH-1Type - Rows 5WS-2 5WS-2 5WS-2 5WS-2 5WS-2 5WS-2 5WS-2FPI 9 9 9 9 9 9 9Face area (sq. ft.) 42.2 42.2 42.2 42.2 42.2 42.2 42.2
Steam CoilsType - Rows 5JA-1, 2 5JA-1, 2 5JA-1, 2 5JA-1, 2 5JA-1, 2 5JA-1, 2 5JA-1, 2FPI 6, 12 6, 12 6, 12 6, 12 6, 12 6, 12 6, 12Face area (sq. ft.) 42.2 42.2 42.2 42.2 42.2 42.2 42.2
Gas Furnace2Input (MBh) 625, 800, 812, 988, 1000, 1250, 1375, 1750, 1875, 2500Nom. Output (MBh) 500, 640, 650, 790, 800, 1000, 1100, 1400, 1500, 2000
Electric Heat3 Nom. Output (kW) 80, 100, 120, 160, 200, 240, 280, 320
Type 30% PleatedArea (sq. ft.) 116.1 116.1 116.1 116.1 116.1 116.1 116.1
No. - size (in.) 11-1620233-1625233-1625211-16202
Prefilters (for Cartridge Filters)
Type Prefilter, Standard Flow Prefilter, Medium FlowArea (sq. ft.) 56.0 56.0 56.0 64.0 64.0 64.0 64.0
No. - size (in.) 4-1224212-242424-12242
12-24242 16-24242 16-24242 16-24242 16-24242
Type Prefilter, Medium Flow Prefilter, High FlowArea (sq. ft.) 64.0 64.0 64.0 80.0 80.0 80.0 80.0
No. - size (in.) 16-24242 16-24242 16-24242 8-1224216-242428-12242
Type 65% or 95% Standard Flow 65% or 95% Medium FlowArea (sq. ft.) 56.0 56.0 56.0 64.0 64.0 64.0 64.0
No. - size (in.) 4-12241212-2424124-122412
12-242412 16-242412 16-242412 16-242412 16-242412
Type 65% or 95% Medium Flow 65% or 95% High FlowArea (sq. ft.) 40.0 64.0 64.0 80.0 80.0 80.0 80.0
No. - size (in.) 16-242412 16-242412 16-242412 8-12241216-2424128-122412
1. Rated in accordance with ARI Standard 3602. Gas furnace size availability is limited by minimum airflow. See Table 24 on page 40.3. Electric heat availability is limited by minimum airflow, See through. See Table 23 on page 40.
CAT 219-2 ROOFPAK PACKAGED SYSTEMS 32 www.DaikinApplied.com
CoolIng CapaCITy daTa
CoolIng CapaCITy daTa
Table 9: RPE/RDE 076C Low Airflow Coil
Unit DataEntering Air
Ambient Wet Bulb Temperature70 75 80
DB WB TH SH KW TH SH KW TH SH KW
24000 cfm 5 row 12 fpi
7563 855 642 49.4 844 637 51.1 832 632 52.867 917 531 50.5 906 526 52.2 893 521 53.971 986 419 51.6 973 415 53.