Carnes Energy Recovery Ventilators SECTION 2 D-16 www.carnes.com Model WE Energy Recovery Ventilators (300 to 8,000 CFM) Model WE Energy Recovery Ventilators provide affordable outside ventilation by combining an exhaust fan, make-up air handler and Carnes Energy Recovery Wheel into a compact package that minimizes capital investment and maximizes payback for heating and cooling equipment. Units available for both inside and outside mounting. BENEFITS: • Low investment with maximum payback. • Easy to use in new construction or renovation. • Flexible, convenient installation and startup. • AHRI certified. AVAILABLE OPTIONS INCLUDE: • ETL/CSA Listing for quick Building Code approvals. • Corrosion Protective Media coating and edge coating. • 4 Duct arrangements with Weather Hoods, Dampers and Roof Curbs. • Temperature and Enthalpy Economizers, Preheat or Defrost Controls. • Remote panels, Time Clocks, BMS interface for effective control. • Rotation Detector, Dirty Filter Switches for operation assurance. • Double Wall Construction, Airflow Gauge for airflow quality. • Optional 5 Year Warranty.
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Carnes Energy Recovery Ventilators
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Model WE Energy Recovery Ventilators(300 to 8,000 CFM)Model WE Energy Recovery Ventilators provide affordable outside ventilation by combiningan exhaust fan, make-up air handler and Carnes Energy Recovery Wheel into a compactpackage that minimizes capital investment and maximizes payback for heating and coolingequipment. Units available for both inside and outside mounting.
BENEFITS:• Low investment with maximum payback.
• Easy to use in new construction or renovation.
• Flexible, convenient installation and startup.
• AHRI certified.
AVAILABLE OPTIONS INCLUDE:• ETL/CSA Listing for quick Building Code approvals.
• Corrosion Protective Media coating and edge coating.
• 4 Duct arrangements with Weather Hoods, Dampers and Roof Curbs.
• Temperature and Enthalpy Economizers, Preheat or Defrost Controls.
• Remote panels, Time Clocks, BMS interface for effective control.
• Rotation Detector, Dirty Filter Switches for operation assurance.
• Double Wall Construction, Airflow Gauge for airflow quality.
• Optional 5 Year Warranty.
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�� PRODUCT OVERVIEW
�� APPLICATION BENEFITS
Carnes Model WE_C is a packaged energyrecovery ventilator (ERV) suitable for 300 to8,000 CFM that allows the designer or build-ing owner to economically provide fresh outside air at near indoor conditions for com-mercial or institutional construction. First costrequirements for cooling and heating capacity are minimized. The total energy
wheel is the only recovery technology thatpassively corrects humidity levels (latentenergy) and temperature (sensible energy)while pre-conditioning outside makeup air.The WE_C unit builds on Carnes thirty-plusyears of manufacturing quality, commercialtotal energy recovery products.
Carnes model WE_C helps designers economically meet ASHRAE Standard 62Ventilation for Acceptable Indoor Air Qualityguidelines for minimum fresh air ventilation of15 to 20 CFM per person. ASHRAE Standard62 guidelines require dramatically increasedoutside air intake to avoid sick building syndrome and related problems from indoorair contaminants. Adherence to ASHRAEStandard 62 is generally considered the bestpossible defense against liabilities related todesign ventilation rates. Increased outsideair intake necessarily demands increased
cooling capacity or preconditioning of outsideair. ASHRAE 90.1 often requires energyrecovery as well.
In many cases, a realistic design credit forenergy recovery will result in lower first costsdue to reduced cooling equipment require-ments. In most middle latitude climates withmoderate to high summer humidity levels,payback periods range from immediate toone year. Additional annual operating sav-ings calculations are available by consultingthe factory.
Benefits• Improves comfort via humidity control
• Reduces peak capacity requirements by 75%
• Reduces first cost of conditioning equipment
• Reduces HVAC energy cost by up to 50%
• Reduced humidity improves duct conditions, with better health and less maintenance
• Reduces peak energy demand and utilityservice
• Reduces climate extremes to air handlers
Typical Applications• Hospitals
• Nursing Homes
• Animal Laboratories
• Pharmaceutical Manufacturing
• Casinos and Bars
• Smoking Lounges
• Schools
• Office Buildings
• Hotels/Motels
• Government Buildings, Prisons
• Military
Model WE Energy Recovery Ventilator
Recovery V
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Applying a 75% design credit, the required cooling capacity is reduced by 3.75 tons, reducing installed system cost by $3,750, minus the cost of the Carnes WE_C unit. In addition, annual energy cost savings total approximately $3,000. Net benefit is no first costincrease, continuing annual energy cost savings for the life of the unit, and compliance withdesign target for fresh air ventilation.
�� APPLICATION EXAMPLE — Indianapolis, INA school requires fresh air ventilation for 4 classrooms containing 100 students and staff.ASHRAE Standard 62 requires 15 CFM per person, or 1,500 CFM total of outside air supply.Conventional air conditioning required to cool the outside air supply to 55°F is 10 tons.Applying a Carnes WE_C Energy Recovery Ventilator preconditions outside air to 79°F @49% RH, reducing cooling load by 5 tons.
Unit Exhaust AirOutside Air Intake
95°F 42% R.H.
Unit Exhaust AirOutside Air Intake
-10°F 100% R.H.
Building Supply Air
79°F 49% R.H.
Building Return Air
75°F 50% R.H.Building Supply Air
54°F 54% R.H.
SUMMER
WINTER
Building Return Air
72°F 35% R.H.
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�� CONSTRUCTION DETAILSThe energy recovery wheel in Carnes modelWEHC features durable 8 inch (203mm) thickcorrugated aluminum construction with a per-manently bonded 3 augstrom molecular sievedesiccant media. Corrosion protection isstandard on the enthalphy wheel.
Carnes WEHC is designed for simple installa-tion and maintenance. Wiring is via a singlepoint exterior disconnect. Factory wheel con-trol options include constant speed drive or aheating and cooling mode for economizeroperation using either outside air tempera-ture or enthalpy setpoints. Drain pans and
associated field plumbing are not required asall moisture is transferred in the air streamswithout condensation.
The recovery wheel is self cleaning.Because the wheel alternates between oppo-site direction supply and exhaust air streams,any particulate matter too large to passthrough the wheel corrugations will beremoved by the opposite airstream.Disposable 2” pleated filters are standard.
A variety of standard duct orientations makethis product suitable for new or retrofit
Weathertight GalvanizedCabinet For Exterior orInterior Installation
WE SIZES 04 - 081,600 to 8,000 CFM — To 1.5 Inch w.g. E. S. P.
Weatherproof HeavyGauge GalvanizedCabinet For Exterioror Interior Installation.
OptionalWeatherhoods.Outside Air WithAluminum Moisture Eliminators.
Single Point Power Connection.NEMA 3R Disconnect.
Hinged Double Wall AccessDoors For Easy Access ToBlowers, Wheel and Filters.
StandardExhaust GBDOptionalMotorizedDampers.
Integral Lifting Lugs.
IAQ Foil Faced InsulationOptional Double Wall.
Efficient DWDI Forward Curved FansNeoprene Mounted On Isolation Rails. BeltDrive With Adjustable Sheaves.
construction wherever supply and exhaustductwork can be co-located. Units can beexterior or interior mounted. Standard unitconstruction is galvanized steel mill finishexterior.
Installation options include:
* Independent fresh air ventilation. Thismethod provides constant quantities of freshoutside air to each space independent ofvariable heating and cooling requirements.This technique provides assurance of fresh
air ventilation goals without regard to variableroom heating and cooling loads.
* Integrated with an existing or new duct system. This configuration intercepts roomexhaust and preconditions fresh air suppliedto a system air handler, rooftop unit or similarsystem device. Outside air is delivered to theair handler at near room neutral conditions oftemperature and humidity.
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Carnes provides equipment selection andperformance calculation software for theEnergy Recovery Ventilators (Energy-C-Lect). This powerful tool is the simplest andfastest way to perform energy recovery performance, unit selection, and submittals.The latest Energy-C-Lect version is availableupon request from the Carnes website.The following manual selection guidelinesare provided primarily so that you may understand the underlying assumptions andcalculations behind the selection software.Use Energy-C-Lect for actual unit selection,performance, and submittals.
1. Determine the type of recovery mediarequired. Total recovery (sensible + latenttransfer) is recommended for most HVACcomfort to comfort ventilation applicationsto gain the maximum benefit for precool-ing. Under normal circumstances totalrecovery media will not result in conden-sation within the cabinet.
2. Determine the minimum unit size from thePerformance Data Charts that providesthe required airflow at the design externalstatic pressure, and the desired wheelefficiency. Determine the desired horse-power for each fan. Note the drive rangeselection for the Product IdentifierDescription.
3. Determine the desired duct configurationfor unit arrangement. Check for compli-ance with any dimensional limitations.Verify minimum clearance on unit sidesfor filter and service access. Special ductconfigurations are available only onModel WM MiniSystems.
4. Select the desired options and accessories for the installation.
�� UNIT SELECTION PROCEDURE
Frost formation on energy recovery devicesis a function primarily of outside air tempera-ture (O.A.T.) and return air relative humidity(%RH). Typical frost formation temperatureswith total recovery media range from 0 to 15Degrees F. O.A.T. Frost control is not normally required if outside air temperaturesare not less than 15°F. more than a fewhours per year.
Consult Energy-C-Lect to determine expect-ed condensation and frost temperatures anddetermine a suitable control strategy.
Consider the following factors to decidewhich option is most suited to the applicationutilizing total recovery media.
Unit On/Off Frost Control shuts the unit offwhenever the outside air temperature fallsbelow an adjustable setpoint temperature.The unit returns to normal operation whenthe outside temperature rises above the setpoint. This option is suitable for climates
with limited hours below 0°F, and such thatsupply air is not required during those hours.Buildings occupied during daytime only mayexperience such low temperatures for verylimited times when occupied.
Exhaust Only Defrost shuts off the supplyblower for a customer adjustable intervalwhen frost is detected on the wheel to defrostthe wheel with warm exhaust air, thenrestarts the supply air blower. The defrostcycle only occurs when frost is detected, andthus minimizes supply air shutoff. This optionis suitable for applications where momentarystoppages of supply air are acceptable, andwhere temperatures are below 15°F. forextended occupied periods.
Variable Speed Defrost slows the enthalphywheel to allow a customer adjustable timeddefrost cycle.
Electric Preheat is suitable where tempera-tures will be below 15°F. for extended peri-
�� FROST CONSIDERATIONS
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�� FROST CONSIDERATIONS
�� OPTIONSETL Listing Available listing shows tests forconformity to UL Standard 1812, and certification to CAN/CSA C22.2 No. 236.
7-Day Programmable Time Clock
Remote Panel with customer selected display is available to be field installed andwired.
Security Cables are available on Sizes 01-03 to prevent loss or damage to access panels.
Painted Cabinets are available to matchexisting building equipment.
Airflow Monitor Gage allows reading ofactual supply or return airflow at the unit.
• EXTENDED WARRANTIES
- Standard wheel warranty - 5 years.
- Optional mechanical only extended war-ranties are available for up to 5 years fromshipment.
• WHEEL CONTROLS
Constant Speed Drive Wheel continuouslyoperates at constant speed. An externalon/off wheel control circuit is supplied.
Temperature Controlled EconomizerMode Adjustable temperature actuated thermostats operate wheel for heating andcooling, and stop wheel for “free cooling”economizer mode. Most appropriate for lowhumidity climates.
Enthalpy Controlled Economizer ModeAdjustable enthalpy controller operateswheel for cooling, and stops wheel for econ-omizer mode. Ideal for use in high humidityclimates where latent recovery is the majorcontributor to total energy savings. Overridecircuit for heating mode is required.
Wheel Variable Speed Drive external speedsignal varies wheel speed to control supplyair temperature.
• UNIT OPTIONS
Double Wall Construction securely isolatesinsulation to prevent damage and air supplycontamination.
Dirty Filter Sensors provide adjustable set-point pressure drop indication for supply andexhaust air streams.
Rotation Detector provides output signal forremote alarm (by others) upon rotation failure.
ods of occupied time and supply air must becontinuously provided. An electric coil is pro-vided to heat outside air above the expectedfrost temperature via a customer adjustabletemperature setpoint. Independent mountingsupport at supply air inlet to be provided byothers. A separate power circuit may be
required. Optional ETL Listing is not avail-able.
Typical preheat design temperature rises areless than 20°F, with relatively low initial andoperating expense in most climates.
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WEHC 01 (300 to 700 CFM)EXTERNAL STATIC PRESS, INCH W. G. (Pa)
- Gravity backdraft dampers for both outsideair and exhaust opening.
- Motorized supply damper with gravitydamper on exhaust.
- Motorized supply and exhaust damper.
- On unit sizes 01-03, dampers will be mounted in the weatherhoods or in externalduct sleeves.
- On unit sizes 04-08, motorized supply andexhaust will have motorized outside andreturn air dampers and GBD exhaust damper.
• WEATHERHOODS
- Galvanized steel weatherhoods are avail-able. Outside air intakes are complete withaluminum moisture eliminators.
• ROOF CURBS
- Prefabricated roof curbs of galvanized or galvalume construction with fiberglassinsulation are available in 8 inch and 14 inchheights for outdoor installation. Other curbheights are available.
SERVICE CLEARANCE FILTERSSIZE SUPPLY SIDE EXHAUST QTY AND SIZE01 32 (813) 30 (762) 2 - 12 x 20 x 2 (305 x 508 x 51)02 46 (1168) 32 (813) 2 - 16 x 25 x 2 (406 x 635 x 51)03 54 (1372) 42 (1067) 4 - 18 x 20 x 2 (457 x 508 x 51)04 54 (1372) 42 (1067) 4 - 24 x 24 x 2 (610 x 610 x 51)06 72 (1829) 42 (1067) 12 - 16 x 20 x 2 (406 x 508 x 51)08 78 (1981) 42 (1067) 8 - 16 x 25 x 2 (406 x 635 x 51)
4 - 20 x 25 x 2 (508 x 635 x 51)
Integral Control Panel mounted inside return air plenum.
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SUPPLY FAN EXHAUST FAN OPTIONS: (Must Be Present In Order Shown,Design Duct Wheel Motor Drive Motor Drive Unit Motor Left Justified) Default Is Standard
Model Series Unit Size Con Drive HP Range HP Range Voltage Type Listing and Applies If No Entry Is Made) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
# - Special Options — Notedesired options in comments
W E H C 0 1 22 8 P 1 P 1 G 1 N
1 - Open Drip Proof (ODP)
5 - Totally Enclosed8 - High Efficiency
ODP9 - High Efficiency
Totally Enclosed
�� ORDERING INFORMATION
ROOF CURBS
DesignModel Series Material Unit Size Curb Height
1 2 3 4 5 6 7 8 9 10
W - EnergyRecovery
X - AccessoryA - GalvalumeG - Galvanized
B - Roof Curbs
010203040608
08 - 8”14 - 14”
W X B A G 0 66 S 0 8
VENTILATORS
Model WE Energy Recovery Ventilator
Recovery V
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• GENERALFurnish and install where shown the CarnesEnergy Recovery Ventilator, Model WE_C.Unit manufacturer shall have a minimum of10 years experience in the design, applica-tion, and manufacture of Energy RecoveryWheels and associated air handling devices. Option: Unit shall be ETL listed in Category169 and Category 294 for Heating andCooling Equipment in accordance with ULStandard 1995, Heating and CoolingEquipment, and CSA C22.2 No. 236.• UNIT CASINGUnit casing shall be heavy gauge galvanizedsteel construction designed for outdoorinstallation; with unit base and internal com-ponents of heavy gauge galvanized or paint-ed steel. Housing roof, sides, and internalpartition shall be furnished with one inch foilfaced fiberboard fiberglass insulation of min-imum 4 pound density. 2 inch pleated,MERV7, disposable filters shall be providedin supply and exhaust air streams. Liftingpoints shall be provided. On outside mountedunits, outside air intake and exhaust air out-let shall not be located on same side of unit.Option: Double wall of galvanized sheetmetal shall enclose insulation.• ACCESSAccess shall be provided through removableaccess panels (Optionally with SecurityCables) or hinged and latched double wallaccess doors.• ENERGY RECOVERY WHEELWheel shall be an enthalpy (sensible +latent) energy recovery rotor constructed ofcorrugated aluminum coated with a nonmigrating, water selective, permanentlybonded, desiccant coating to permit sensibleand latent energy transfer. Energy recoveryratings shall be in accordance with ASHRAEStandard 84, and performance certified toARI 1060. Wheel media shall be independ-ently tested in accordance with ASTM-E-87,and shown to conform to the requirements ofNFPA-90A by documenting a flame spread of
less than 25 and a smoke generations ratingof less than 50.Moisture transfer shall take place in the vaporphase and media shall remain dry to thetouch in both summer and winter operation.A purge section shall be incorporated to limitcarryover of exhaust air contaminants intothe supply air. Rotor shall be driven by main-tenance free speed reducer and welded ure-thane belt. Rotor shall require no cleaningunder normal operating conditions. However,if cleaning should be required, the rotor shallbe capable of being cleaned with vacuum,compressed air, dry steam, hot water, or lightdetergent.The two faces of the energy recovery wheelshall be covered and sealed with an epoxycoating chosen for corrosion resistance.Option: Economizer Mode - adjustable
temperature or enthalpy controlledoperate wheel for heating and coolingmodes, and stops wheel for “freecooling” economizer mode.
Option: Rotation detector provides output signal for remote alarm (by others)upon rotation failure.
�� TYPICAL SPECIFICATIONS
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• FANSFans shall be double width, double inlet, forward curved type, with individual motorsand adjustable belt sheaves to enable independent balancing of supply and exhaustair streams. All blower wheels shall be statically and dynamically balanced.• MOTORSMotors shall be permanently lubricated,heavy duty, sealed bearing type. Motors shallmeet EPACT minimum efficiency standards.Fan/motor assembly shall be mounted onneoprene vibration isolators to unit base.• ELECTRICALElectrical components shall be prewired to asingle point power connection, complete withall required operating circuitry installed in aninternal control panel, integral fuse protec-tion, 24 volt control circuit, fan motor starterswith overload protection, terminal strip con-nections, and externally mounted NEMA 3Rdisconnect as standard. External circuit con-nections to control unit on/off, and independ-ently, recovery rotor on/off, shall be provided.Option: Intake weather hood shall be
complete with moisture eliminator.Exhaust weather hood shall containan integral gravity backdraft damperor motorized damper.
Option: Gravity backdraft or motorizeddampers shall be mounted in ductsleeves, weather hoods, or flush tocabinet exterior.
Option: Dirty Filter Sensors provideadjustable set point pressure dropindication for supply and exhaust airstream filters for alarm circuits byothers.
Option: Painted cabinet is available.Option: Airflow monitor gauges are available
to set and ensure supply andexhaust airflows.
Option: 7 Day Programmable Time Clockmounted in internal control panel or
remotely is available.Option: Remote control panel of customer
defined configuration may be provided.
Option: Electric Preheat Coil shall be weath-erproof, of sufficient capacity to raiseoutside air from winter design to calculated frost formation potentialtemperature, and complete with supply air thermostat of appropriatetemperature range. A separate electrical power circuit shall be provided to the preheat coil.
Option: Exhaust Fan Only Frost Control shallinitiate field adjustable timed defrostcycle upon sensing low supply airtemperature, shutting off supplyblower momentarily for wheeldefrost.
Option: Variable wheel speed defrost allowswarm exhaust air to defrost thewheel.
Option: On/Off Frost Control will shut unit offwhen low outside air temperaturesare sensed. Unit shall restart whenoutside air temperature rises aboveadjustable setpoint.
Option: Fan VFD for each fan to vary fanspeed by external speed signal.
Option: 1 VFD to operate both fans withspeed controlled by external speedsignal.
Option: Digital electronic controller to monitor and control the ERV. BACnetand LonWorks communications.
• ROOF CURBSFull perimeter prefabricated roof curbs of galvanized or galvalume construction withfiberglass insulation in standard 8 inch or 14inch heights for outdoor installation shall beprovided by the unit manufacturer.
