20LCi and w20LCi Heat and Energy Recovery Ventilators ...v~user-guide...pressure to recover into static pressure. See the figure below. For 100% recovery of velocity pressure into

20LCi and w20LCiHeat and Energy

Recovery VentilatorsInstallation, Operation and Service Instructions

HRV 20LCi

ERV w20LCi

VB0036

VB0037

09/00 04629

Contents

1 Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3 Installation3.1 Check Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.2 Mount Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.3 Ductwork Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.4 Install Drain Line For Condensate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.5 Systems Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.6 Make Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Start Up4.1 Controls And Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.2 Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.3 Airflow Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Service5.1 Quarterly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75.2 Annual Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85.3 Testing And Replacement Of The Damper Actuator . . . . . . . . . . . . . . . 95.4 Motor And Blower Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.5 Motor And Blower Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.6 Adjusting Belt Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.7 Cassette Removal (ERV only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.8 Cassette Service (ERV only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.9 Belt Tension Adjustment/Replacement (ERV only) . . . . . . . . . . . . . . . .10

Appendix A - Equipment Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Appendix B - Typical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Appendix C - Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Appendix D - HRV 20LCi Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Appendix E - ERV w20LCi Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Appendix F - Airflow Performances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Appendix G - Enthalpy Wheel Pressure Drop Chart for ERV w20LCi Rotor . . . .15

Appendix H - Terminal Control Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Appendix I - Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Appendix J - Trouble Shooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

1 Safety ConsiderationsHazards may exist within this equipment because it

contains electrical and powerful moving components.Only qualified service personnel should install or service this equipment. Untrained personnel can perform basic maintenance such as maintaining filters.Observe precautions marked in literature and on labelsattached to the unit. Follow all safety codes.

2 General SpecificationsThese ceiling series are a successful solution to

ventilation and indoor air quality problems. Intended forinstallation within a suspended ceiling space ormechanical room, these ventilators provide 100% outdoor air ventilation.This series consists of commercialinterior heat and energy recovery ventilators.

HRV 20LCiThis ventilator tranfers the heat from the exhaust

airstream to the supply airstream. The Heat RecoveryVentilator (HRV) uses a flat plate heat exchanger whichmay be more suited to some applications requiringstringent cross contamination control.

ERV w20LCiThis ventilator provides energy recovery between

the exhaust and supply airstreams. The EnergyRecovery Ventilator (ERV) uses an enthalpy wheel fortotal energy recovery providing superior efficiency inhot and humid climates.

Both models are also effective in cold climates anduse various types of frost control or defrost to ensureoperation when outside temperatures are extremelylow.

See Appendix A for more detailed equipment data.

3 Installation

3.1 Check EquipmentMove the unit to its installation location and remove

packaging. See Appendix A for unit weight and specifications.

Remove all internal packaging (ERV w20LCi only)Remove access panels and remove all packaging

from the unit. Note that there is packaging for the wheelsupport during shipping. Removal of all this packagingis critical.

InspectionInspect the equipment, exterior and interior, for

damage. Ensure that there is no damage to the internalcomponents such as fans, motors, dampers, flat plateheat exchangers or enthalpy wheel, insulation, drains(if applicable) and structures. File a claim with the shippingcompany if the unit is damaged.

System RequirementsConsult National Electrical Code and local building

codes for special installation requirements. Note additional requirements in Appendix A and in the Start-UpSection (page 7). Also, see Appendix C for more electrical data information.

The unit should be installed to allow easy access for maintenance. Appendix D and E show minimumclearance requirements between front access and anyobstruction to allow for removal of components (fans,filters, flat plate heat exchangers or enthalpy wheel).The front of the unit is defined in relation to the inletports and outlet ports on the unit. Port location andoverall dimensions shown in Appendix D and E.

In cold climates with -5°F (-20°C) design, the unitmust be mounted in a dry area (not exceeding 30% RH)to avoid water condensation on the cabinet during winteroperation. Alternatively, accommodation must be madefor condensation on the cabinet exterior. Heat recoverymodel (20LCi) should be mounted in a heated space toprevent drain lines from freezing. Do not mount units inan area where exposure to hot chimneys, electricalpanels or other hazards will occur.

A mounting location close to an exterior partition willminimize the length of insulated ductwork required.Appendix B illustrates ductwork through exterior partitions.These should be separated by a minimum of 8 feet(2438mm) to avoid outside cross contamination.

WARNINGDisconnect main power switches to unit beforeperforming service or maintenance. Electric shockcan cause personal injury or death.

3.2 Mount Unit

LocationMaintain clearance around and above the unit to

provide proper airflow and service access. The freshair intake hood must be positioned away from sourcesof contamination such as chimneys, exhaust vents, etc.

Positioning the fresh air intake opposite to the prevailing winds will reduce entry of snow or moistureduring periods of high winds.

Ceiling MountThese units must be mounted level and may be hung

with threaded rod (field supplied) through the protrudingframe at the base of the units. Hole centers are shownin the dimension drawings in Appendix D and E. Do notblock access to panels as indicated in Appendix B.Rubber or seismic vibration isolation may be requiredin some regions (field supplied and specified).

Floor MountThese units may be secured to the floor using

isolation/vibration pads. The pads may be located oneach corner of the unit’s frame (all mounting hardware is field supplied and specified).

Space is required beneath the heat recovery model(20LCi) to make drain connections.

3.3 Ductwork Information

Make Duct ConnectionsLocations, sizes and labels of the ports for the units

are shown in Appendix D and E.

For HRV 20LCi only: A section of straight ductapproximately 36" (914mm) long [10" x 14" (254 x 356mm),minimum 3 duct diameter long] must be used immediatelyafter the fans to achieve good fan performance.

For all models: Transitions (field supplied) may berequired to make connection with ductwork that isproperly sized for minimum noise and pressure loss.Both duct connections to outside must be insulated toavoid condensation and heat loss. A continuous integralvapor barrier must be used over the duct insulation.

Airflow rate balancing dampers are recommendedfor both supply and exhaust ducts to allow for adjustment of airflows. Flexible connectors should beinstalled close to the unit in the duct leading to occupiedspaces to minimize noise transmission.

For HRV 20LCi only: All ports have 1" (25mm)flanges to facilitate duct connection.

For all models: Ensure that the fasteners used tomake duct connection do not interfere with fans ordampers in the unit.

Electric preheat, if used as frost control, must beinstalled in the outdoor air duct at a minimum distancefrom the unit port of 24" (610mm).

Ductwork Design Consideration

The discharge ductwork immediately downstreamfrom the fan is critical for successful applications.Poorly designed ductwork can degrade fan performanceand contributes to excessive pressure drop and noise.

When designing ductwork in the field, it is important touse a straight discharge duct of the correct dimensionsto obtain maximum fan performance. The straight sectionof ductwork helps the airflow to develop a uniformvelocity profile as it exits the fan and allows the velocitypressure to recover into static pressure. See the figurebelow.

For 100% recovery of velocity pressure into staticpressure, the straight portion of the discharge ductmust be at least 2.5 times the discharge diameter tothe length of the straight portion of ductwork.

As an example of how to size the straight portion ofduct, assume the fan has a 13.5" x 9.5" discharge outlet = 0.89 ft2.

Refer to this table for the effect of undersized equivalentduct diameter.

NOTE:This information is referenced from AMCA Fans and

Systems Publication 201-90.

Calculate Equivalent Duct DiameterThe equivalent duct diameter of the fan outlet:= (4ab ÷ π)0.5= (4 x 13.5 x 9.5)0.5

π= 12.75 = ~13

So the straight duct length required would be:= 2.5 x 13= 32.5" long (2.7 feet)

No 12% 25% 50% 100%Duct Effective Effective Effective Effective

Duct Duct Duct Duct

Pressure 0% 50% 80% 90% 100%Recovery

3.4 Install Drain Line For Condensate (For HRV 20LCi unit only)

This unit requires a drain line because condensateoccurs during heating seasons. The 3/4" NPT (19mm)drain connections are located at the bottom of the unit.Make sure that the drain connection is tight beforeinstalling the unit. This unit must have an external trapfor the condensate drainage. The drain trap must be atleast 4" (102mm) deep and be protected against freezeup. Do not use pipe smaller than the unit connection.

Drain lines must be field fabricated and supplied. Donot solder connections when they are attached to theunit because high temperature may damage the plasticfittings on the unit.

3.5 Systems Integration

Forced Air SystemWhen the heat recovery (or the energy recovery)

ventilator is installed in conjunction with a forced-airsystem, the air handler and the network of ducts associated with it are used to distribute fresh air insidethe building. If this type of system is used, the main fanof the air handler must operate continuously when theunit is on. Fan Interlock (see following diagrams) canbe connected in the unit control box to the integratedcontrol board terminals J3-1 and J3-2 (for low voltageClass II circuit only).The controller makes relay contactbetween these terminals when the unit is operating.

Fresh air from the heat recovery (or energy recovery)ventilator should be introduced into the return duct ofthe air handler at a point no less than 6 feet (1829mm)upstream of the air handler. The duct connection forstale air to the unit should be made on the return airduct at least 2 feet (610mm) upstream of the fresh airduct connection.

Separate SystemsSelect locations for exhaust grills and supply

diffusers to provide effective ventilation and avoid shortcircuiting airflows through the space. Adjustabledampers should be provided at every grille and diffuserto make balancing of the system possible.

Exterior Hoods (Field Installed)The outside air intake hood must be positioned away

from sources of contamination. It should also be a minimum of 8 feet (2438mm) from the exhaust hood oraccording to local building code to prevent cross contamination.

A screen grid is recommended to prevent intake ofdebris and pests. It should be removable in cold climates where frost blockage may occur.

Backdraft DamperA backdraft gravity damper is supplied with

defrost (or recirculation defrost) units to be installed inthe exhaust air to outside duct. This damper is necessary to prevent air from entering the buildingthrough the exhaust duct when the unit is in defrost (orrecirculation defrost) mode. The size of the damper is12" x 26" (305 x 660mm). Mount the damper in theexhaust air to outside duct as shown in Appendix B.

Sikaflex Seal Unit Insulation

3/4“ NPT Diameter Drain

1/4“12“

Thermal Insulation

P-Trap By Contractor

4“ Min.(102 mm)

VD0053A

Drain Lines

CO

MM

.

N/C

N/O

48644 POWER CONTROL BOARD

J1J2

J3

JU1J4

1 2 3F F I O OC L Y R G B

A B C D E F G

3 2 1

69

47

1

FAN INTERLOCK CONTACTS

VE0026A

:::: : ::

Fan Interlock for HRV 20LCi

Fan Interlock for ERV w20LCi

:C

OM

M.

N/C

N/O

48644 POWER CONTROL BOARD

J1J2

J3

JU1J4

1 2 3F F I O OC L Y R G B

A B C D E F G

3 2 1

69

47

1

FAN INTERLOCK CONTACTS

VE0025A

3.6 Make Electrical Connections

Elecrical requirements

Location of wire connections required are shown inAppendix D and E. Units are available in 208/230 volts,1 phase. Please see Appendix C for electrical data.

For ERV w20LCi onlyA junction box or disconnect switch must be field

supplied where line voltage connections are made.Consult the local building electrical codes for the properselection of power disconnect device(s).

For HRV 20LCi only: Power SupplyThis unit may or may not have a factory installed

disconnect switch. If disconnect is field supplied, providea disconnect per NEC. Use copper conductors only.

All field wiring must comply with NEC and localrequirements. In Canada, electrical connections mustbe in accordance with CSA C22.1 Canadian ElectricalCode Part One.

High Voltage Field ConnectionA high voltage connection is located on the

outside of the unit with knockout. See Appendix D andE. A wiring diagram is located on the control box coverinside of the unit.

Electrical DataFor more specific information including MCA, MOP

and HP options, see Appendix C.

4 Start Up

4.1 Controls And DefrostA low voltage remote control wiring interface is provided

on the unit. The installer must provide wiring for thecontrols that may be supplied optionally. The optionalwall controls require a four wire LVT-24 gauge (orequivalent). This control is 12VDC. Other terminals are24VAC or dry contact control. Terminals are availablefor the following controls:

LOW-COM-HIGHMakes dry contact for speed setting

Wall Control4-wire LVT-24 gauge minimum (12VDC)

Occupied Timer/Sensor24VAC, needs dry contact (Do not use with Venta,

Supra, Basic or Electro controls)

Remote Fan Control (control wiring option)24VAC (requires single pole, double throw switch)

Unoccupied Recirc Contacts (with recirculation optiononly)

Makes dry contact

DefrostThe unit functions are controlled by integrated controls

including exhaust only or recirculation defrost (optional).In cold temperatures, defrost cycles will remove frostfrom the flat plate heat exchanger (HRV unit) or from theenthalpy wheel (ERV unit) to maintain proper operation.This removal of frost occurs when a damper closes theoutside air port and allows room air to pass through theflat plate heat exchanger (HRV unit) or through theenthalpy wheel (ERV unit). Each unit has differentdefrost requirements and the schedules are shown inAppendix A.Exhaust Only

Supply fan is de-energized, exhaust fan is energized,exhausts return air to outdoors. There is no outdoor airventilation for the duration of defrost. Also, on w20LCiunits, the ERV enthalpy wheel maintains rotation.Recirculation (Option)

Exhaust fan is de-energized, supply fan is energizedand circulates return air through the flat plate heatexchanger (HRV unit) or through the enthalpy wheel(ERV unit) and back to the building.There is no outdoorair ventilation for the duration of defrost. The ERVenthalpy wheel stops rotating.

ControlsFor more information on the controls available on

the 2000 cfm ventilators, see the following Appendix Hreferences:

H-1 Wall Control Connection

H-2 Occupied Timer/Sensor Connection

H-3 Remote Fan Control

H-4 Unoccupied Recirc Contacts

4.2 Sequence Of Operation

Before start-up, check the unit for obstructive packaging, objects near or in blowers, dampers, flatplate heat exchangers (HRV unit) or enthalpy wheel(ERV unit), etc. Once installation is complete, check allmodes of operation to ensure that the unit is workingproperly. Close the doors and check for operation on'LOW-COM-HIGH' (HRV unit) or on LOW, OFF andHIGH modes (ERV unit). Use a wall control or the drycontact switching to run fan speeds, see Appendix H-1and H-3.

WARNINGUnit cabinet must have an uninterrupted, unbrokenelectrical ground to minimize the possibility of personalinjury if an electrical fault should occur. Failure tofollow this warning could result in the installerbeing liable for the personal injury of others.

IMPORTANTOn ERV unit only, on initial power up, the unit willperform a system check and operate at highspeed for 5 seconds.

Unit check points:___ Power connected, no ventilation call - Both fans

are off, defrost damper (if equipped) closes offfresh air from outside.

___ Power connected, low speed call (if equipped) -Both fans on low speed, defrost damper closes (ifequipped) recirculation opening. If unit is singlespeed, it will come on that speed on a call for lowor high.

___ Power connected, high speed call. Both fans onhigh speed, defrost damper (if equipped) closesrecirculation opening. If unit is single speed, it willcome on the speed on a call for low or high.

___ Power connected, occupied timer/sensor connection open (unoccupied mode) - Both fansare off, defrost damper (if equipped) opens recirculation opening.

___ Power connected, recirculation defrost option isfactory installed. Recirc contacts are closed,exhaust fan is de-energized, supply fan runs andrecirculation damper closes.

4.3 Airflow BalancingFor maximum performance the unit must operate

with equal supply and exhaust flow rates. FlowMeasuring Stations (FMS) and Magnehelic gaugescan be used to measure and compare supply flow withexhaust flow. Appendix B shows proper installation ofthe FMS in the 'exhaust from space' and 'supply tospace' ducts for measuring exhaust and supply flowsrespectively. It is important to locate the FMS in the'warm side' ductwork as described above to minimizethe effect of differences in air density, especially whenbalancing during extreme cold outside conditions. Airdensity variations can affect the FMS by more that 15%.

The FMS should be located downstream fromstraight sections of duct and not immediately after fansor obstructions that will cause turbulent flow. SeeAppendix B which illustrates minimum distances fromfan elbows for best operation.

Flow control dampers should be installed downstreamfrom the FMS so flow through the FMS is not disturbed.Dampers can then be adjusted to equalize flow rated inthe ducts.

For ERV unit only:

Another method of airflow balancing is to measurethe pressure drop across the enthalpy wheel and correlate it to an airflow. See Appendix G for EnthalpyWheel Pressure Drop Chart.

Setting Flow RateFlow rates should be balanced with units operating

on high speed. A damper must be used to establishminimum duct pressure required so that fans do notoperate in overload regions. See Appendix F for fanperformance rates of the units. Set the dampers toestablish the minimum duct pressure required. Furtheradjust the dampers to reduce flow to the desired, balanced rate.

5 Service

5.1 Quarterly Maintenance

Quarterly maintenance should include:

Air FiltersThe standard medium efficiency filters are

disposable and should be replaced every 3 months.More frequent replacement may be required underextremely dirty operating conditions. For filter specifications see Appendix A.

Filter Service for HRV unit (20LCi)To remove the filters, first remove the filter access

door. The filters can be removed simply by sliding themforward out along the filter tracks. There are two filtersper airstream.

Filter Service for ERV unit (w20LCi)To replace the filters, you must remove the support

wires from the filter frame before removing the filter, asshown.

WARNINGDisconnect power to the unit before performingmaintenance procedures.

Support Wires

NOTE: Remove support wires from filter frame, then remove filter.

VD0055A

ERV Exhaust Filter Service (w20LCi)To remove the exhaust filters in the ERV w20LCi,

remove the screw holding the filter access door andslide the exhaust filter access door down to the bottomof the unit. The filters are set in frames and can beremoved by pulling on the filter tabs and sliding themforward and out of the unit. First, the right filter must beremoved, then the left filter must slide over to wherethe right filter was, then pull it forward and out of theunit as shown below.

HRV 20LCi Drain Pans and Interior of UnitWith the filters removed from the unit, the foil-faced

insulation surfaces and drain pans should be wipedclean with a soft cloth and mild cleaning solution. Alsoensure that the drain fittings are free from dirt and aredraining freely.

ERV w20LCi Cassette Panels and Interior of UnitRemove the filters from the unit. Wipe the foil-faced

insulation surfaces and cassette panels with a softcloth and mild cleaning solution.

5.2 Annual Maintenance

Air FiltersReplace filters.

HRV 20LCi Drain Pans and Interior of UnitWash the foil-faced insulation surfaces and wipe the

drain pans with a soft cloth and mild cleaning solution.Check the drain fittings to ensure that they are drainingfreely.

ERV w20LCi Interior of UnitWash the foil-faced insulation surfaces with a soft

cloth and mild cleaning solution.

HRV 20LCi Flat Plate Heat ExchangerRemove the flat plate heat exchanger by sliding it

out from the tracks holding it in place.

The flat plate heat exchanger must be handled withcare. It is recommended that they be washed once ayear following the season of most intense use, in orderto ensure maximum efficiency of the plastic or alu-minum partitions. Allow the flat plate heat exchangersto soak for 3 hours in warm water and mild soap. Rinseunder a heavy stream of water.

ERV Enthalpy Wheel (w20LCi)No cleaning of the enthalpy wheel is required. The

wheel is self-cleaning due to the opposing airflows. Ifthe enthalpy wheel is cleaned; use compressed air, lowpressure steam or non-polarized solvents. Wash thecassette panels (See Figure 3 in Section 5.8) with asoft cloth and mild cleaning solution. Visually inspectthe cassette wiper seals (shown below), perimeterseal, and drive belt (See Figure 4 in Section 5.8) forproper operation.

FansThe blower wheels and fan housing should be

checked for dirt build-up. If they are dirty, it will be necessary to remove the blower assembly to clean thedust out through the fan mouth.

System Operation CheckVerification of all control modes should be checked

to ensure proper operation. Refer to Start-Up Section.

WARNINGDisconnect power to the unit before performingmaintenance procedures.

CAUTIONThe flat plate heat exchanger must be correctlypositioned when replaced in unit. Failure to do somay result in damage to the exchanger. Followinstructions on the flat plate heat exchanger label.

VD0056A

CAUTIONHot water and strong cleaning agents could damagethe polypropylene flat plate heat exchangers.

ROTOR WiperSeal

CorrectOperation

VD0057A

5.3 Testing And Replacement Of TheDamper Actuator (ERV only)

After disconnecting the power from the unit, determineif the damper is defective. Disconnect the 24V powersource. Connect the actuator directly to a 24V powersource with an appropriate cable. If the damper operatescorrectly, the problem is either in the wiring connectionsor main circuit board.

If the damper does not work, it must be replaced.Take out the two mounting screws to remove theassembly. Install a new actuator assembly, connect alllinkages and test for proper operation.

5.4 Motor and Blower Removal1. Disconnect power from the unit.

2. Disconnect the 4-wire service connector betweenthe motor and control box.

3. Remove the fan assembly by loosening the backtwo 3/8" x 1 1/2" (10 x 38mm) bolts and removingthe front two 3/8" x 1 1/2" (10 x 38mm) bolts. Thefan base is slotted and will slide forward on the railsand out of the cabinet.

5.5 Motor and Blower ServiceBelt tension is adjusted by two 5/16" (8mm) bolts. Set

adjustment nuts to the proper belt tension. Belt size A-46.

5.6 Adjusting Belt TensionExcessive belt tension is the

number one cause of blower bearingfailure. Proper belt tension and pulleyalignment are essential for troublefree operation. A simple rule ofthumb for checking belt tension isillustrated here. When the belt isgrasped as shown, a total deflectionof approximately 1" (25mm) (1/2"(13 mm) each side) should be easilyattained. Insufficient deflection

indicates that the belt is too tight, resulting in noisefrom excessive vibration, premature bearing failure andshort belt life. Tight belts may overload a motor thatwould otherwise be adequate. Fan RPM can be adjustedto achieve the desired airflow by setting the adjustablesheave on the motor shaft (See Figure 1). Pulley setscrew torque setting 110 in•lbs to 130 in•lbs.

5.7 Cassette Removal (ERV only)After disconnecting the power from the unit, remove

the access door and the filters located above the wheelshown below. Disconnect the drive motor harness (SeeFigure 5). Slide the panel located below the cassette(with the label "Exhaust Filter Access") downward untilit clears the cassette beam (See Figure 2). Pull thecassette out partway (approximately 1/3).

5.8 Cassette Service (ERV only)To replace or adjust the wiper seal, remove the five

#8 type B screws as shown below.

To replace the UHMW bearing, remove the four 1/4" x 3/4"(6 x 19mm) socket head cap screws. Lift the cassettesupport beam off of the cassette and the bearing canthen be pushed out of the beam after removing the #6type B screws that hold the bearing in place.

Figure 1: Typical Motor and Blower

Adjustable sheavefor fan RPM

Belt tensionadjusting bolts

Serviceconnector

Remove four 3/8" x 1 1/2" bolts

Loosen back bolts

VD0059

VD0058

Figure 2: Cassette

Filters "Exhaust FilterAccess" Label

VD0060

Cassette And Drive

Drive Motor

UHMW Bearing

Wiper Seal

#10 16 x 1/2" Self Drill Screws

Cassette Panels

1/4" x 3/4" Socket Head Cap Screws

#8 Philips Screws

Figure 3: Cassette and DriveVD0065A

To access the cassette drive area, loosen the leftside 1/4" x 3/4" (6 x 19mm) socket head cap screwsand remove the bottom left cassette panel by prying itup and away from the Velcro tabs.

To remove the drive pulley, gently slide the drive beltup and off of the pulley, being careful not to kink the beltin any way. Loosen the pulley set screw and slide thepulley off of the drive motor shaft.

To remove the drive belt, remove the four 1/4" x 3/4"(6 x 19mm) socket head cap screws and lift the cassette support beam off of the cassette. Remove theother three cassette panels by prying it up and awayfrom the Velcro tabs. Slide the belt up and off of therotor.

To remove the perimeter seal, locate the Velcroseam and pull apart. The seal can then be pulled awayfrom the rotor by prying the two Velcro surfaces apartas shown below.

To remove the drive motor, remove the four 11/32"(8mm) nylock nuts and disconnect the motor wiringfrom the capacitor.

5.9 Belt Tension Adjustment/Replacement (ERV only)

After disconnecting the power from the unit, removethe access door and the filters located above the wheel(See Figure 2). Disconnect the drive motor harnessshown below. Slide the panel located below the cassette(with the label "Exhaust Filter Access") downward until itclears the cassette beam (See Figure 2). Pull the cassetteout partway (approximately 1/3).To adjust the belt tension,the lower left plastic panel on top of the cassette mustbe removed.

Loosen the four 11/32" adjustment plate nuts (shownbelow) two or three turns.

Turn the belt tension adjustment bolt (shown below)clockwise to tighten or counterclockwise to loosen.

Adjust the tension as required. Tighten the adjustmentplate nuts to secure the belt tension adjustment plate inplace. Re-fasten the cassette metal panel and re-connectthe power harness to the cassette motor.Push the cassetteback into place.

NOTE:

The belt tension is factory set and should only beadjusted when replacing the belt or when the belt de-rails.

CASSETTE AND DRIVE

CAPACITOR

REMOVE FOUR8/32" NYLOCK NUTS

DRIVE PULLEY DRIVE BELTPERIMETER SEAL

VELCRO SEAL

Figure 4: Cassette Drive Close-UpVD0066A

Figure 5: Drive Motor Harness

Drive MotorHarness

VD0063

Belt tension adjustment plate

11/32" adjustmentplate nuts

VD0062

Belt tension adjustment bolt

VD0061

See Appendix I for more trouble shooting information

Appendix AEquipment Data

HRV 20LCi ERV w20LCiShipping weight 750 lbs (341 kg) 725 lbs (330 kg)Net weight 700 lbs (318 kg) 700 lbs (318 kg)Shipping dimensions 94" x 52" x 36" 94" x 52" x 36"

l x w x h 2388 x 1321 x 914mm 2388 x 1321 x 914mmOpenings

location ends of unit ends of unitsize w x h

- supply inlet 12" x 26" (305 x 660mm) 12" x 26" (305 x 660mm)- exhaust outlet 10" x 14" (254 x 356mm) 10" x 14" (254 x 356mm)

Fans (standard)Supplyimpeller (fwd centrifugal) 12.75" dia x 7.0" width 12.75" dia x 7.0" width

(324 x 178mm) (324 x 178mm)high speed 1200 rpm 1200 rpmmotor 1.5 HP, 2 speeds (standard) 1.5 HP, 2 speeds (standard)

2 HP, 1 speed (optional) 2 HP, 1 speed (optional)

Exhaustimpeller (fwd centrifugal) 12.75" dia x 7.0" width 12.75" dia x 9.0" width

(324 x 178mm) (324 x 229mm)high speed 1200 rpm 1200 rpmmotor 1.5 HP, 2 speeds (standard) 1.5 HP, 2 speeds (standard)

2 HP, 1 speed (optional) 2 HP, 1 speed (optional)Filters

Supply: quantity 2 MEF 12" x 24" x 4" disposable 24" x 24" x 2" disposable(305 x 610 x 102mm) (610 x 610 x 51mm)

Exhaust: quantity 2 MEF 12" x 24" x 4" disposable 24" x 24" x 2" disposable(305 x 610 x 102mm) (610 x 610 x 51mm)

Defrost Cycle (if equipped) Standard Extended Standardactivation, stage 1 23°F (-5°C) 5°F (-15°C)

recirculation 6 min. (defrost) 10 min. (defrost) 6 minutesventilation 32 min. (vent) 28 min. (vent) 30 minutes

activation, stage 2 -22°F (-30°C) N/Arecirculation 6 min. (defrost) 10 min. (defrost) preheat requiredventilation 19 min. (vent) 15 min. (vent) below -21°F (-30°C)

Drainsquantity ... size (NPT) 2 - 3/4" outside thread NPT N/A

3/4" inside thread fit requiredBackdraft Damper

size (recirculation defrost) 12.00" x 26.00" 12.00" x 26.00"(305 x 660mm) (305 x 660mm)

Appendix BTypical Installation and Minimum Distance Requirements

BalancingDamper

FlowMeasuringStation

BackdraftDamper

EXHAUST OUTS

IDE

SUPPLY TO SPACE

EXHAUST FROMSPACE

INTAKE FROM

OUTSIDE

CLEARANCE REQUIR

ED TO

REMOVE COMPONENT

S

FOR MAINTENANCE

2 D FT MIN 5 D FT MINcf in.

minimum

STRAIGHT DUCT SECTION REQUIRED

TO ACHIEVE GOOD AIR FLOW RATES.

SEE SECTION 3.3 MINIMUM DISTANCE BETWEEN EXTERIOR HOODS

8 ft. OR ACCORDING TO LOCAL BUILDING CODES

ALL CONNECTIONS MADEWITH FLEXIBLE COLLARSSUPPLIED BY OTHERS

2 D FT MIN 2 D FT MIN

5 D FT MIN

BalancingDamper

FlowMeasuringStation

IF ELECTRIC PREHEAT IS USED

LOCATE IT HERE(MINIMUM 24” FROM THE UNIT)VD0068A

Legend"D" - equivalent round duct diameter for determining minimum lengths"Cf" - front clearance required for maintenance.8" x 20" (203 x 508mm) duct D = 13.5" (343mm)12" x 26" (305 x 660mm) duct D = 19.0" (483mm)

Minimum clearance required for access:

HRV 20LCi ERV w20LCifront clearance - Cf 28" (711mm) 48" (1219mm)

back clearance none required but 24" (610mm) for none required but 24" (610mm) forsimplified access to service exhaust fan simplified access to service exhaust fan

NOTE: Based on full load motor consumption. Values shown are for the complete unit and include both motors.

Selection With Different Size Supply And Exhaust Motors

For different motor HP:

1) Select the MCA and MOP for each motor.2) Add the two numbers together and divide by 2.

Example:

208/1/60MCA MOP

1 1/2 HP motor 22.38 31.882 HP motor 30.70 43.90Total 53.08 75.78Real value 26.54 37.89

208/1/60 230/1/60Motor HP MCA MOP MCA MOP

1 1/2 22.38 31.88 21.25 30.25

2 30.70 43.90 30.25 43.25

Appendix CElectrical Data

Appendix DHRV 20LCi Dimensions

14.0

00"

[356

]

12.7

50"

[324

]

7.62

5"[1

94]

10.0

00"

[254

]10

.000

"[2

54]

7.62

5"[1

94]

5.25

0"[1

33]

6.00

0" [1

52]

6.00

0"[1

52]

4.50

0"[1

14]

4.50

0"[1

14]

12.2

50"

[311

]

36.5

00"

[927

]48

.500

"[1

232]

91.0

00"

[231

1]

88.5

00"

[224

8]

85.0

00"

[215

9]

50.5

00"

[128

3]

23.2

50"

[591

]44.

375"

[112

7]46

.000

"[1

168]

48.5

00"

[123

2]

30.0

00"

[762

]12

.000

"[3

05]

4.00

0"[1

02]

26.0

00"

[660

]

26.0

00"

[660

]2.

000"

[51]

12.0

00"

[305

]

17.2

50"

[438

]

1.25

0"[3

2] 14.0

00"

[356

]20

.375

"[5

18]

26.0

00"

[660

]

26.0

00"

[660

]

14.0

00"

[356

]

LEF

T S

IDE

EX

HA

US

TA

IRO

PE

NIN

GS

UP

PLY

AIR

OP

EN

ING

A

C

B D

SU

PP

LY F

AN

CO

NT

RO

L B

OX

AC

CE

SS

PA

NE

L

FIL

TE

RA

CC

ES

S P

AN

EL

E

FR

ON

T

OU

TD

OO

RA

IR

RE

TU

RN

AIR

DC

SU

PP

LY A

IR

EX

HA

US

T A

IR

AB

EX

HA

US

T F

AN

AC

CE

SS

PA

NE

L

FIL

TE

RA

CC

ES

SP

AN

EL

TO

P

OU

TD

OO

R A

IRO

PE

NIN

G

RE

TU

RN

AIR

OP

EN

ING

RIG

HT

SID

E

PLA

TE

HE

AT

EX

CH

AN

GE

R

A M

INIM

UM

OF

26.

000"

[660

] CLE

AR

AN

CE

FR

OM

AN

Y O

BS

TR

UC

TIO

N IS

RE

QU

IRE

DF

OR

RE

MO

VA

L O

F P

LAT

E H

EA

T E

XC

HA

NG

ER

S, F

AN

S, A

ND

FIL

TE

RS

.

Dim

ensi

ons

in [

] ar

e in

mill

imet

ers

Cen

ter

of g

ravi

tyD

irect

ion

of a

irflo

w

NO

TE

S:

PT

SH

RV

2000

iLB

S18

6.22

149.

3520

2.24

162.

1970

0.00

Kg

84.4

767

.74

91.7

373

.57

317.

50

A B C

TO

TAL

D

Line

pow

er s

uppl

y kn

ocko

utA

CO

NN

EC

TIO

N T

AB

LE

CO

NN

EC

TIO

N S

IZE

S

7/8

or 1

1/8

Line

pow

er s

uppl

y kn

ocko

ut (

reve

rse

door

opt

ion)

B7/

8 or

1 1

/8

Low

vol

tage

con

nect

ion

C

Low

vol

tage

con

nect

ion

(rev

erse

d do

or o

ptio

n)D

Con

dens

ate

drai

nE

3/4"

NP

T

VK

0035

A

Appendix EERV w20LCi Dimensions

Dim

ensi

ons

in [

] ar

e in

mill

imet

ers

Cen

ter

of g

ravi

ty

Line

pow

er s

uppl

y kn

ocko

utDire

ctio

n of

airf

low

PT

S

A B C

A

DT

OTA

L

LBS

173.

73

158.

22

192.

62

175.

4370

0.00

Kg

78.8

0

71.7

6

87.3

7

7/8"

or

1 1/

8"

79.5

731

7.52

ER

V20

00i

CO

NN

EC

TIO

N T

AB

LE

Con

nect

ion

Siz

es

NO

TE

S:

EX

HA

US

T A

IRT

O O

UT

SID

E

SU

PP

LY A

IRT

O B

UIL

DIN

G

SU

PP

LY F

AN

CO

NT

RO

L B

OX

AC

CE

SS

PA

NE

LLO

W V

OLT

AG

EC

ON

NE

CT

ION

SU

PP

LYA

IRO

PE

NIN

G

EX

HA

US

TA

IRO

PE

NIN

G

10.0

00"

[254

]5.

380"

[137

]4.

000"

[102

]2.

000"

[51]

A

10.7

50"

[273

]

48.0

00"

[121

9]

7.62

5"[1

94]

10.0

00"

[254

]

5.25

0" [1

33]

12.7

50"

[324

]

7.62

5"[1

94]

14.0

00"

[356

]

13.2

51"

[337

]

14.0

00"

[356

]

36.5

00"

[927

]48

.500

"[1

232]

44.6

25"

[113

3]

23.0

00"

[584

]44.

375"

[112

7]46

.000

"[1

168]

48.5

00"

[123

2]

12.0

00"

[305

]

30.0

00"

[762

]

12.0

00"

[305

]

1.00

0"[2

5]

26.0

00"

[660

]2.

845"

[72]

3.50

0"[8

9]

26.0

00"

[660

]

1.75

0"[4

4]

2.75

0"[7

0]

91.0

00"

[231

1]

88.5

00"

[224

8]

85.0

00"

[215

9]

OU

TD

OO

R A

IRO

PE

NIN

G

RE

TU

RN

AIR

OP

EN

ING

OP

TIO

NA

L S

UP

PLY

D

AM

PE

R F

OR

NO

N-D

EF

RO

ST

UN

ITS

CA

SS

ET

TE

,F

ILT

ER

AC

CE

SS

PA

NE

L

A M

INIM

UM

OF

48.

000"

[121

9] C

LEA

RA

NC

E F

RO

M A

NY

OB

ST

RU

CT

ION

IS

RE

QU

IRE

D F

OR

RE

MO

VA

L O

F E

NE

RG

Y R

EC

OV

ER

Y M

OD

ULE

, FA

NS

AN

D F

ILT

ER

S.

EN

ER

GY

R

EC

OV

ER

Y M

OD

ULE

RE

TU

RN

AIR

FIL

TE

RA

CC

ES

S P

AN

EL

EX

HA

US

T F

AN

AC

CE

SS

PA

NE

L

OU

TD

OO

RA

IR

DC

TO

P

FR

ON

TLE

FT

SID

ER

IGH

T S

IDE

AB

VK

0036

A

Appendix F

Enthalpy Wheel Pressure Drop Chart for ERV w20LCi Rotor

Appendix G

Airflow Performances

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 HPRPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Fan Pulley

HRV 20LCi Fan Performance - Supply (in. wg.)

1.5

2.0

1.111.241.381.531.691.85

111512011250135013751390

114312251275131013401375

1.131.261.401.551.701.87

1085120012251260127513001325

1.021.141.271.411.561.711.87

1.021.141.281.411.561.711.87

1125116012001225125012751300

1.021.141.271.411.551.701.86

1100112511601200122512601275

1.131.251.391.531.691.84

110011501175120012251250

1.101.231.371.511.661.821.98

1075110011251175120012301275

1.071.201.331.471.621.781.94

1050107511001150117512101250

1.031.151.291.431.581.731.89

1020105010901125115012101225

Airflow(cfm)130014001500160017001800190020002100220023002400250026002700

ERV 20LCi Supply and Exhaust (in. wg.)

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 HPRPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Fan Pulley

1.5

2.0

1.041.151.271.391.521.651.791.93

9509589779931016103010351071

91293194797198699210281047

1.041.151.271.391.511.641.771.91

88390092494094798210021013

1.031.141.251.371.491.621.751.89

1.021.121.231.351.471.591.721.862.00

8508748918999359559679801001

1.091.201.311.431.551.681.821.95

839849885905919923955969

1.061.161.271.391.511.631.761.90

796831853868882905921945

1.011.111.221.331.451.571.701.84

775798813830853870894915

1.051.161.271.381.511.63

755773798816841863

1.091.201.311.43

738758784807

Airflow(cfm)140015001600170018001900200021002200230024002500260027002800

42’’ Dia.cfm12001300140015001600170018001900200021002200230024002500260027002800

4’’ Depthfpm286310334357381405429453477501524548572596620644668

Pressure Dropin W.G.

0.130.150.170.180.190.200.210.220.240.250.260.280.290.300.320.340.35

Appendix H

WallControl

CONTROL CONTACTS

CLASS 2 VOLTAGE

WALL CONTROL

BLACK1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

NOTE: Connections are all dry contacts except wall control, wheel alarm contacts and 24 VAC power contacts.

Use of 24 VAC circuit requires isolating contacts (ex. thermostat) to prevent interconnection of Class 2 outputs.

RED

OCCUPIEDTIMER/SENSOR

FIELD WIREDTERMINALS

A B

UNOCC.RECIRC

CONTACTS

LOW

COMMON

HIGH(-) 24 VAC

(40 VA)

(+) 24 VAC

GREEN

YELLOW

(RECIRC UNITS)

VE0027A

Two types of remote wall controls are available:

1. Venta or Basic with fan switch and dehumidistatcontrol

2. Supra or Electro with fan mode selection,dehumidistat control, and maintenance indicator

The remote wall controls work with the integratedelectronic controls within the unit to control ventilationsequences. Each wall control above has differentfeatures and require 4-wire connection to the unit asshown below. Without the wall control, fans can beoperated with dry contacts or a switch as in controldiagram H-3.

NOTE: An occupied timer or sensor device cannot beused with the Supra or Electro wall controls.

NOTE: The factory installed jumper across terminals3 and 4 must be in place.

Occupancy control is achieved by connection tothe terminal interface shown below. These terminalsrequire a dry contact which could be provided by anumber of types of controls such as a timer, lightsensor, occupancy sensor, building managementsystem, or other. The unit will not operate unlessthese contacts are closed!!

The drawing below shows a factory installedjumper and programmable timer option.

NOTE: An occupied timer or sensor device cannot beused with the Supra or Electro wall controls.

JUMPER(factory installed)

OCCUPANCY CONTROL(field installed)

1

M

2 3 4 5

JUM

PE

R

CONTROL CONTACTS

CLASS 2 VOLTAGE

WALL CONTROL

BLACK1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20



RED



A B

UNOCC.RECIRC

CONTACTS

LOW

COMMON

HIGH(-) 24 VAC

(40 VA)

(+) 24 VAC

GREEN

YELLOW

(RECIRC UNITS)

CONTROL CONTACTS

CLASS 2 VOLTAGE

WALL CONTROL

BLACK1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20



RED



A B

UNOCC.RECIRC

CONTACTS

LOW

COMMON

HIGH(-) 24 VAC

(40 VA)

(+) 24 VAC

GREEN

YELLOW

(RECIRC UNITS)

VE0028A

H-1: Wall Control Connection H-2: Occupied Timer/Sensor Connection

Terminal Control Diagrams

Appendix H ContinuedTerminal Control Diagrams

Remote fan control can be achieved by connectingdry contact controls to the terminal interface atterminals labeled: LOW - COM - HIGH (Not allunits have 2 speeds). Placing a jumper across the'LOW' and 'COM' terminals will put the unit in lowspeed ventilation or placing a jumper across the'HIGH' and 'COM' terminals will put the unit into highspeed. DO NOT jumper all three terminals together.These controls could also be the following: SPDTswitch, dehumidistat, CO2 sensor, light sensor, heatsensor, timer, building management system, etc.Thedrawing below represents a switch connected to the unit.

CAUTION: Do not use a wall control and remote fanswitch at the same time. Damage to the unit mayoccur.

REMOTE FAN SWITCH

LOW HIGH

NOTE: Not all units have two speeds

CONTROL CONTACTS

CLASS 2 VOLTAGE

WALL CONTROL

BLACK1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20



RED



A B

UNOCC.RECIRC

CONTACTS

LOW

COMMON

HIGH(-) 24 VAC

(40 VA)

(+) 24 VAC

GREEN

YELLOW

(RECIRC UNITS)

VE0029A

H-3: Remote Fan Control H-4: Unocupied Recirc. Contacts

On recirc defrost units, an unoccupied recirc controlcan be achieved by connection to the terminal interface shown below. These terminals require adry contact which could be provided by a timer, thermostat or other. Closure of these terminals willcause the unit to go into a 'recirc mode' where thesupply fan runs on high speed and the exhaust fanstops.

NOTE: Although these contacts are intended foruse during unoccupied periods, they are still active during an occupied condition. Therefore, the fieldsupplied dry contacts should be installed such that theyare disabled during occupied periods as to not causethe unit to go into a recirc condition unnecessarily.

24 VAC RequiredDRY CONTACTS

(Supplied by others)

CONTROL CONTACTS

CLASS 2 VOLTAGE

WALL CONTROL

BLACK1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20



RED



A B

UNOCC.RECIRC

CONTACTS

LOW

COMMON

HIGH(-) 24 VAC

(40 VA)

(+) 24 VAC

GREEN

YELLOW

(RECIRC UNITS)

VE0030A

Appendix IWiring Diagram for HRV 20LCi and ERV w20LCi (1 speed, exhaust defrost)S

UP

PLY

MO

TOR

L1

L2

G

W/Y

BK/Y

NO

TE

3

T4

1

2

3

4 G

6 CCS

UP

PLY

R3/

C2-

1

5

21

NO

CO

M

BK/Y

W/Y

G

EX

HA

US

TM

OTO

R

L1

L2

G

W/Y

BK/Y

NO

TE

3

T4

1

2

3

4 G

6 CCE

XH

AU

ST

R3/

C2-

2

5

21

NO

CO

M

BK/Y

W/Y

G

BK

BK

R

R

L1C

L2C

L1T

5G G

T1

L2

DIS

CO

NN

EC

T O

PT

ION

SE

E N

OT

E 1

:

208

/ 230

/ 1

/ 60

G

BK

RBK

/YB

K/Y

J1 6

J1 4

R

DE

F D

AM

PE

RM

OTO

R

C

O

N

G/R

BK/R

SU

PP

LY D

AM

PE

RO

PT

ION T3

3

2

1

W/R

NO

TIN

CLU

DE

DW

ITH

NO

N-D

EF

UN

ITS

6 CCDE

F D

AM

PE

R

R2-

2

5

21

NO

CO

M

W

W

J1 2

NC

34

G/R

W/RJ1 8

BK/RJ1 9

W

W

1 2

3 4

5 6

BK R

W

H2

X2

X1

H1

F2

W

BK

115V

TR

AN

SF

OR

ME

R T

R2

W/R

EX

DA

MP

ER

MO

TOR

C

O

N

G/R

BK/R

DA

MP

ER

OP

TIO

NS

T3

3

2

1

W/R

G/R

WIR

ES

NO

T IN

CLU

DE

DW

ITH

SP

RIN

GR

ET

UR

N D

AM

PE

RS

(IN

CLU

DE

S B

OT

HD

EF

AN

D E

XH

)

W/BL

J1 7

J1 5

BK/BL

WH

EE

L D

RIV

EM

OT

OR

NO

T IN

CLU

DE

DW

ITH

HR

V U

NIT

S

6 CCD

AM

PE

RS

R2-

1

5

21

NO

CO

M

NC

34

G/R

BK

/R

W/R

BL

BL

BL

R

EX

DA

MP

ER

MO

TOR

G1

L

1 L

2

BK/BL

2

1

W/BL

T2

6 CCE

NT

HA

LPY

R1-

1

5

21

NO

CO

M

NC

34

J4 W

J1

1 W

J1

3

W

W

BL

-t

DE

FR

OS

TT

EM

P.S

EN

SO

R

JU1J421

A B C D E F G

1 2 3 4 5 6 7 8 9J3F F I OC OL Y R G B

4

7

6

9

J13 2 1

8

1 2 3J2

CO

MM

.

N/C

N/O

:: :: :: :

EN

TH

ALP

YA

LM 2

4VA

LM C

OM

FW

A

1 2 3 4 5 6 7 8 9 10

T7

BLA

CK

RE

DO

CC

./U

NO

CC

.24

V -

24V

+

11 12 13 14 15 16 17 18 19 20

T7

GR

EE

NY

ELL

OW

LOW

CO

MH

IGH

DIR

TY

FIL

TE

RU

NO

CC

RE

CIR

CF

W B

O

G

G

O

BK BK

BK

R

G

G

G W BL

Y

CO

NT

RO

LB

OA

RD

2022

52

VO

LTA

GE

208

/ 1

/ 60

2

30 /

1 / 6

0

FU

SE

F2

0.

5 A

TR

AN

SF

OR

ME

RT

R2

120

V P

RIM

, 24V

SE

C, 4

0VA

SU

PP

LY M

OT

OR

20

8/ 2

30/ 1

/ 60

1.5

or 2

HP

INH

ER

EN

T P

RO

TE

CT

ION

BU

ILT

IN

EX

HA

US

T M

OT

OR

208/

230

/ 1/ 6

0 1.

5 or

2 H

P

IN

HE

RE

NT

PR

OT

EC

TIO

N B

UIL

T IN

WH

EE

L D

RIV

E

2

08/ 2

30/ 1

/ 60

1.5

or 2

HP

MO

TO

R

IN

HE

RE

NT

PR

OT

EC

TIO

N B

UIL

T IN

RE

LAY

1

2

4VA

C C

OIL

, DP

DT

10A

, 240

VA

C

RE

LAY

2

12

0VA

C C

OIL

, DP

DT

1/2

HP,

240

VA

C

RE

LAY

3

12

0VA

C C

OIL

, DP

ST

3H

P, 2

40V

AC

CO

NTA

CT

OR

C2

120

VA

C C

OIL

, 2 P

OLE

, 5H

P, 2

30V

AC

,

2H

P 1

20V

AC

, FLA

30A

#18

AW

G W

IRE

#14

AW

G W

IRE

#12

AW

G W

IRE

PO

WE

R L

INE

AN

Y V

/ 3

/ 60

115

VO

LTLO

W V

OLT

AG

E

NO

TE

S1-

3 P

OLE

DIS

CO

NN

EC

TIO

N S

WIT

CH

OP

TIO

NA

L.

FIE

LD C

ON

NE

CT

ION

S T

O T

ER

MIN

ALS

ON

SW

ITC

H.

S

ING

LE P

HA

SE

RE

QU

IRE

S A

NE

UT

RA

L W

IRE

WIT

H L

1 &

L2.

2- S

UP

PLY

AN

D E

XH

AU

ST

MO

TO

RS

MA

Y N

OT

BE

EQ

UIP

PE

D

WIT

H ‘‘

WIR

ED

’’ T

’STA

TS

BU

T M

AY

HA

VE

AU

TO

OV

ER

LOA

DS

.

IF S

O, C

ON

NE

CT

OR

T2

IS E

LIM

INA

TE

D.

3- F

OR

SIN

GLE

PH

AS

E M

OT

OR

S W

ITH

2 H

P, A

CO

NTA

CT

OR

IS U

SE

D.

4- IF

AN

Y O

F T

HE

OR

IGIN

AL

WIR

E, A

S S

UP

PLI

ED

, MU

ST

BE

R

EP

LAC

ED

, US

E T

HE

SA

ME

OR

EQ

UIV

ALE

NT

WIR

E.

5- T

HE

FIE

LD W

IRIN

G M

US

T C

OM

PLY

WIT

H A

PP

LIC

AB

LE

CO

DE

S, O

RD

ON

NA

NC

ES

AN

D R

EG

ULA

TIO

NS

.

BL

BK

BK

/BL

BK

/RB

K/Y

G G/R

CO

LOR

CO

DE

O R W W/B

LW

/RW

/YY

BLU

EB

LAC

KB

LAC

K/B

LUE

BLA

CK

/RE

DB

LAC

K/Y

ELL

OW

GR

EE

NG

RE

EN

/RE

D

OR

AN

GE

RE

DW

HIT

EW

HIT

E/B

LUE

WH

ITE

/RE

DW

HIT

E/Y

ELL

OW

YE

LLO

W

VE

0031

A

24V

3.9

K

Appendix I ContinuedWiring Diagram for HRV 20LCi and ERV w20LCi (2 speeds, exhaust defrost)

BK

/YJ1

6

J1 4

DE

F D

AM

PE

RM

OTO

R

C

O

N

G/R

BK/R

SU

PP

LY D

AM

PE

RO

PT

ION T3

3

2

1

W/R

NO

TIN

CLU

DE

DW

ITH

NO

N-D

EF

UN

ITS

6 CCDE

F D

AM

PE

R

R2-

2

5

21

NO

CO

M

NC

34

W/RJ1 8

BK/RJ1 9

EX

DA

MP

ER

MO

TOR

C

O

N

G/R

BK/R

DA

MP

ER

OP

TIO

NS

T3

3

2

1

W/R

C/R

WIR

ES

NO

T IN

CLU

DE

DW

ITH

SP

RIN

GR

ET

UR

N D

AM

PE

RS

(IN

CLU

DE

S B

OT

HD

EF

AN

D E

XH

)

W/BL

J1 7

J1 5

BK/BL

WH

EE

L D

RIV

EM

OT

OR

NO

T IN

CLU

DE

DW

ITH

HR

V U

NIT

S

6 CCD

AM

PE

RS

R2-

1

5

21

NO

CO

M

NC

34

G/R

BK

/R

W/R

BL

BL

EX

DA

MP

ER

MO

TOR

G1

L

1 L

2

BK/BL

2

1

W/BL

T2

6 CCE

NT

HA

LPY

R1-

1

5

21

NO

CO

M

NC

34

J4

J1

3

W

-t

DE

FR

OS

TT

EM

P.S

EN

SO

R

JU1J421

A B C D E F G

1 2 3 4 5 6 7 8 9J3F F I OC OL Y R G B

4

7

6

9

J13 2 1

8

1 2 3J2

CO

MM

.

N/C

N/O

:: :: :: :

EN

TH

ALP

YA

LM 2

4VA

LM C

OM

FW

A

1 2 3 4 5 6 7 8 9 10

T7

BLA

CK

RE

DO

CC

./U

NO

CC

.24

V -

24V

+

11 12 13 14 15 16 17 18 19 20

T7

GR

EE

NY

ELL

OW

LOW

CO

MH

IGH

DIR

TY

FIL

TE

RU

NO

CC

RE

CIR

CF

W B

O

G

G

O

BK BK

BK

R

G

G

G

Y

CO

NT

RO

LB

OA

RD

2022

52

VO

LTA

GE

208

/ 1

/ 60

2

30 /

1 / 6

0

FU

SE

F2

0.

5 A

TR

AN

SF

OR

ME

RT

R2

120

V P

RIM

, 24V

SE

C, 4

0VA

SU

PP

LY M

OT

OR

20

8/ 2

30/ 1

/ 60

1.5

or 2

HP

INH

ER

EN

T P

RO

TE

CT

ION

BU

ILT

IN

EX

HA

US

T M

OT

OR

208/

230

/ 1/ 6

0 1.

5 or

2 H

P

IN

HE

RE

NT

PR

OT

EC

TIO

N B

UIL

T IN

WH

EE

L D

RIV

E

2

08/ 2

30/ 1

/ 60

1.5

or 2

HP

MO

TO

R

IN

HE

RE

NT

PR

OT

EC

TIO

N B

UIL

T IN

RE

LAY

1

2

4VA

C C

OIL

, DP

DT

10A

, 240

VA

C

RE

LAY

2

12

0VA

C C

OIL

, DP

DT

1/2

HP,

240

VA

C

RE

LAY

3

12

0VA

C C

OIL

, DP

ST

3H

P, 2

40V

AC

CO

NTA

CT

OR

C2

120

VA

C C

OIL

, 2 P

OLE

, 5H

P, 2

30V

AC

,

2H

P 1

20V

AC

, FLA

30A

#18

AW

G W

IRE

#14

AW

G W

IRE

#12

AW

G W

IRE

PO

WE

R L

INE

AN

Y V

/ 3

/ 60

115

VO

LTLO

W V

OLT

AG

E

NO

TE

S1-

3 P

OLE

DIS

CO

NN

EC

TIO

N S

WIT

CH

OP

TIO

NA

L.

FIE

LD C

ON

NE

CT

ION

S T

O T

ER

MIN

ALS

ON

SW

ITC

H.

S

ING

LE P

HA

SE

RE

QU

IRE

S A

NE

UT

RA

L W

IRE

WIT

H L

1 &

L2.

2- S

UP

PLY

AN

D E

XH

AU

ST

MO

TO

RS

MA

Y N

OT

BE

EQ

UIP

PE

D

WIT

H ‘‘

WIR

ED

’’ T

’STA

TS

BU

T M

AY

HA

VE

AU

TO

OV

ER

LOA

DS

.

IF S

O, C

ON

NE

CT

OR

T2

IS E

LIM

INA

TE

D.

3- F

OR

SIN

GLE

PH

AS

E M

OT

OR

S W

ITH

2 H

P, A

CO

NTA

CT

OR

IS U

SE

D.

4- IF

AN

Y O

F T

HE

OR

IGIN

AL

WIR

E, A

S S

UP

PLI

ED

, MU

ST

BE

R

EP

LAC

ED

, US

E T

HE

SA

ME

OR

EQ

UIV

ALE

NT

WIR

E.

5- T

HE

FIE

LD W

IRIN

G M

US

T C

OM

PLY

WIT

H A

PP

LIC

AB

LE

CO

DE

S, O

RD

ON

NA

NC

ES

AN

D R

EG

ULA

TIO

NS

.

BL

BK

BK

/BL

BK

/RB

K/Y

G G/R

CO

LOR

CO

DE

O R R/Y

W W/B

LW

/RW

/YY

BLU

EB

LAC

KB

LAC

K/B

LUE

BLA

CK

/RE

DB

LAC

K/Y

ELL

OW

GR

EE

NG

RE

EN

/RE

D

OR

AN

GE

RE

DR

ED

/YE

LLO

WW

HIT

EW

HIT

E/B

LUE

WH

ITE

/RE

DW

HIT

E/Y

ELL

OW

YE

LLO

W

VE

0032

A

6 CCEX

HA

US

T L

O

R3/

C2-

3

5

21

NO

CO

M

6 CC

R2-

3

5

21

NC

CO

M

SU

PP

LYM

OTO

R

LO

LIN

E H

I G

W/Y

BK/Y

NO

TE

3

T4

1

2

3

4 G

6 CCS

UP

PLY

LO

R3/

C2-

1

5

21

NO

CO

M

R/Y

W/Y

R

DIS

CO

NN

EC

T O

PT

ION

SE

E N

OT

E 1

:

208

/ 230

/ 1

/ 60

G

BK

R

R/Y

G

6 CCEX

HA

US

T H

I

R3/

C2-

4

5

21

NO

CO

M

R

BK

/Y

EX

HA

US

TM

OTO

R

W/Y

BK/Y

NO

TE

3

T4

1

2

3

4 G

LO

LIN

E H

I G

R/Y

G

6 CCS

UP

PLY

HI

R3/

C2-

2

5

21

NO

CO

M

R

R/Y

W/Y

BK/Y

BK

R

R

W

W

1 2

3 4

5 6

J1

1 W

L1C

L2C

L1T

5G G

T1

L2 W

J1 2 W

W/RJ1 8

BK/RJ1 9

R

BK

H2

X2

X1

H1

F2

W

BK

115V

TR

AN

SF

OR

ME

R T

R2

24V

R W

W/R

BL

W

BL

WB

L

BK

W

NO

34

3.9

K

Appendix I ContinuedWiring Diagram for HRV 20LCi and ERV w20LCi (1 speed, recirculation defrost)

DE

F D

AM

PE

RM

OTO

R

C

O

N

G/R

BK/R

RE

CIR

C. D

AM

PE

RO

PT

ION T3

3

2

1

W/R

NO

TIN

CLU

DE

DW

ITH

NO

N-D

EF

UN

ITS

6 CCDE

F D

AM

PE

R

R2-

2

5

21

NO

CO

M

NC

34 W/R

J1 8

DA

MP

ER

OP

TIO

NS

G/R

WIR

ES

NO

T IN

CLU

DE

DW

ITH

SP

RIN

GR

ET

UR

N D

AM

PE

RS

(IN

CLU

DE

S B

OT

HD

EF

AN

D E

XH

)

BK/BLJ1 7

WH

EE

L D

RIV

EM

OT

OR

NO

T IN

CLU

DE

DW

ITH

HR

V U

NIT

S

6 CCD

AM

PE

RS

R2-

1

5

21

NO

CO

M

NC

34

BL

BL

EX

DA

MP

ER

MO

TOR

G1

L

1 L

2

BK/BL

2

1

W/BL

T2

6 CCE

NT

HA

LPY

R1-

1

5

21

NO

CO

M

NC

34

J4

J1

3

W

-t

DE

FR

OS

TT

EM

P.S

EN

SO

R

JU1J421

A B C D E F G

1 2 3 4 5 6 7 8 9J3F F I OC OL Y R G B

4

7

6

9

J13 2 1

8

1 2 3J2

CO

MM

.

N/C

N/O

:: :: :: :

EN

TH

ALP

YA

LM 2

4VA

LM C

OM

FW

A

1 2 3 4 5 6 7 8 9 10

T7

BLA

CK

RE

DO

CC

./U

NO

CC

.24

V -

24V

+

11 12 13 14 15 16 17 18 19 20

T7

GR

EE

NY

ELL

OW

LOW

CO

MH

IGH

DIR

TY

FIL

TE

RU

NO

CC

RE

CIR

CF

W B

O

G

G

O

BK BK

BK

R

G

G

G

Y

CO

NT

RO

LB

OA

RD

2022

52

VO

LTA

GE

208

/ 1

/ 60

2

30 /

1 / 6

0F

US

E F

2

0.5

A

TR

AN

SF

OR

ME

RT

R2

120

V P

RIM

, 24V

SE

C, 4

0VA

SU

PP

LY M

OT

OR

20

8/ 2

30/ 1

/ 60

1.5

or 2

HP

INH

ER

EN

T P

RO

TE

CT

ION

BU

ILT

IN

EX

HA

US

T M

OT

OR

208/

230

/ 1/ 6

0 1.

5 or

2 H

P

IN

HE

RE

NT

PR

OT

EC

TIO

N B

UIL

T IN

WH

EE

L D

RIV

E

2

08/ 2

30/ 1

/ 60

1.5

or 2

HP

MO

TO

R

IN

HE

RE

NT

PR

OT

EC

TIO

N B

UIL

T IN

RE

LAY

1

24V

AC

CO

IL, D

PD

T 1

0A, 2

40V

AC

RE

LAY

2

120

VA

C C

OIL

, DP

DT

1/2

HP,

240

VA

CC

ON

TAC

TO

R C

2

120

VA

C C

OIL

, 2 P

OLE

, 5H

P, 2

30V

AC

,

2H

P 1

20V

AC

, FLA

30A

#18

AW

G W

IRE

#14

AW

G W

IRE

#12

AW

G W

IRE

PO

WE

R L

INE

AN

Y V

/ 3

/ 60

115

VO

LTLO

W V

OLT

AG

E

NO

TE

S1-

3 P

OLE

DIS

CO

NN

EC

TIO

N S

WIT

CH

OP

TIO

NA

L.

FIE

LD C

ON

NE

CT

ION

S T

O T

ER

MIN

ALS

ON

SW

ITC

H.

S

ING

LE P

HA

SE

RE

QU

IRE

S A

NE

UT

RA

L W

IRE

WIT

H L

1 &

L2.

2- S

UP

PLY

AN

D E

XH

AU

ST

MO

TO

RS

MA

Y N

OT

BE

EQ

UIP

PE

D

WIT

H ‘‘

WIR

ED

’’ T

’STA

TS

BU

T M

AY

HA

VE

AU

TO

OV

ER

LOA

DS

.

IF S

O, C

ON

NE

CT

OR

T2

IS E

LIM

INA

TE

D.

3- F

OR

SIN

GLE

PH

AS

E M

OT

OR

S W

ITH

2 H

P, A

CO

NTA

CT

OR

IS U

SE

D.

4- IF

AN

Y O

F T

HE

OR

IGIN

AL

WIR

E, A

S S

UP

PLI

ED

, MU

ST

BE

R

EP

LAC

ED

, US

E T

HE

SA

ME

OR

EQ

UIV

ALE

NT

WIR

E.

5- T

HE

FIE

LD W

IRIN

G M

US

T C

OM

PLY

WIT

H A

PP

LIC

AB

LE

CO

DE

S, O

RD

ON

NA

NC

ES

AN

D R

EG

ULA

TIO

NS

.V

E00

34A

6 CC

R2-

3

5

21

NC

CO

M

SU

PP

LYM

OTO

R

L1

L2

G

W/Y

BK/YN

OT

E 3

T4

1

2

3

4 G

6 CC

SU

PP

LY

R3/

C2-

1

5

21

NO

CO

M

W/Y

R

DIS

CO

NN

EC

T O

PT

ION

SE

E N

OT

E 1

:

208

/ 230

/ 1

/ 60

G

BK

R G

R

BK/Y

EX

HA

US

TM

OTO

R

W/Y

BK/Y

NO

TE

3

T4

1

2

3

4 G

G

W/Y

BK/Y

BK

1 2

3 4

5 6

L1C

L2C

L1T

5G G

T1

L2 W

J1 2 W

W/RJ1 8

R

BK

H2

X2

X1

H1

F2

W

BK

115V

TR

AN

SF

OR

ME

R T

R2

24V

R

W/R

BL

W

BL

WB

L

BK

NO

34

BL

BK

BK

/BL

BK

/RB

K/Y

G G/R

O

CO

LOR

CO

DE

R R/Y

W W/B

LW

/RW

/YY

BLU

EB

LAC

KB

LAC

K/B

LUE

BLA

CK

/RE

DB

LAC

K/Y

ELL

OW

GR

EE

NG

RE

EN

/RE

DO

RA

NG

E

RE

DR

ED

/YE

LLO

WW

HIT

EW

HIT

E/B

LUE

WH

ITE

/RE

DW

HIT

E/Y

ELL

OW

YE

LLO

W

CC

R4-

1

1N

C

CO

M

NO

463

2 5 87

9

BK

/R R

J1 9

J1 4

BK/R

BK/Y

J1

1 W

BK

/YJ1

6

W W

/BL

J1

5 WSU

P D

AM

PE

RM

OTO

R

C

O

N

G/R

BK/R

T3

3

2

1

W/R

EX

DA

MP

ER

MO

TOR

C

O

N

G/R

BK/R

T3

3

2

1

W/R

G/R

G/R

BK

/R W

/R W

/R

RE

LAY

3

12

0VA

C C

OIL

, DP

ST

3H

P, 2

40V

AC

RE

LAY

4

24

VA

C C

OIL

, TP

DT

10A

, 240

VA

C

3.9

K

6 CCE

XH

AU

ST

R3/

C2-

2

5

21

NO

CO

M

BK

/Y W

W

W/B

L

L1

L2

G

Appendix I ContinuedWiring Diagram for HRV 20LCi and ERV w20LCi (2 speeds, recirculation defrost)

DE

F D

AM

PE

RM

OTO

R

C

O

N

G/R

BK/R

SU

PP

LY D

AM

PE

RO

PT

ION T3

3

2

1

W/R

NO

TIN

CLU

DE

DW

ITH

NO

N-D

EF

UN

ITS

6 CCDE

F D

AM

PE

R

R2-

2

5

21

NO

CO

M

NC

34 W/R

J1 8

DA

MP

ER

OP

TIO

NS

G/R

WIR

ES

NO

T IN

CLU

DE

DW

ITH

SP

RIN

GR

ET

UR

N D

AM

PE

RS

(IN

CLU

DE

S B

OT

HD

EF

AN

D E

XH

)

BK/BLJ1 7

WH

EE

L D

RIV

EM

OT

OR

NO

T IN

CLU

DE

DW

ITH

HR

V U

NIT

S

6 CCD

AM

PE

RS

R2-

1

5

21

NO

CO

M

NC

34

BL

BL

EX

DA

MP

ER

MO

TOR

G1

L

1 L

2

BK/BL

2

1

W/BL

T2

6 CCE

NT

HA

LPY

R1-

1

5

21

NO

CO

M

NC

34

J4

J1

3

W

-t

DE

FR

OS

TT

EM

P.S

EN

SO

R

JU1J421

A B C D E F G

1 2 3 4 5 6 7 8 9J3F F I OC OL Y R G B

4

7

6

9

J13 2 1

8

1 2 3J2

CO

MM

.

N/C

N/O

:: :: :: :

EN

TH

ALP

YA

LM 2

4VA

LM C

OM

FW

A

1 2 3 4 5 6 7 8 9 10

T7

BLA

CK

RE

DO

CC

./U

NO

CC

.24

V -

24V

+

11 12 13 14 15 16 17 18 19 20

T7

GR

EE

NY

ELL

OW

LOW

CO

MH

IGH

DIR

TY

FIL

TE

RU

NO

CC

RE

CIR

CF

W B

O

G

G

O

BK BK

BK

R

G

G

G

Y

CO

NT

RO

LB

OA

RD

2022

52

VO

LTA

GE

208

/ 1

/ 60

2

30 /

1 / 6

0F

US

E F

2

0.5

A

TR

AN

SF

OR

ME

RT

R2

120

V P

RIM

, 24V

SE

C, 4

0VA

SU

PP

LY M

OT

OR

20

8/ 2

30/ 1

/ 60

1.5

or 2

HP

INH

ER

EN

T P

RO

TE

CT

ION

BU

ILT

IN

EX

HA

US

T M

OT

OR

208/

230

/ 1/ 6

0 1.

5 or

2 H

P

IN

HE

RE

NT

PR

OT

EC

TIO

N B

UIL

T IN

WH

EE

L D

RIV

E

2

08/ 2

30/ 1

/ 60

1.5

or 2

HP

MO

TO

R

IN

HE

RE

NT

PR

OT

EC

TIO

N B

UIL

T IN

RE

LAY

1

24V

AC

CO

IL, D

PD

T 1

0A, 2

40V

AC

RE

LAY

2

120

VA

C C

OIL

, DP

DT

1/2

HP,

240

VA

CC

ON

TAC

TO

R C

2

120

VA

C C

OIL

, 2 P

OLE

, 5H

P, 2

30V

AC

,

2H

P 1

20V

AC

, FLA

30A

#18

AW

G W

IRE

#14

AW

G W

IRE

#12

AW

G W

IRE

PO

WE

R L

INE

AN

Y V

/ 3

/ 60

115

VO

LTLO

W V

OLT

AG

E

NO

TE

S1-

3 P

OLE

DIS

CO

NN

EC

TIO

N S

WIT

CH

OP

TIO

NA

L.

FIE

LD C

ON

NE

CT

ION

S T

O T

ER

MIN

ALS

ON

SW

ITC

H.

S

ING

LE P

HA

SE

RE

QU

IRE

S A

NE

UT

RA

L W

IRE

WIT

H L

1 &

L2.

2- S

UP

PLY

AN

D E

XH

AU

ST

MO

TO

RS

MA

Y N

OT

BE

EQ

UIP

PE

D

WIT

H ‘‘

WIR

ED

’’ T

’STA

TS

BU

T M

AY

HA

VE

AU

TO

OV

ER

LOA

DS

.

IF S

O, C

ON

NE

CT

OR

T2

IS E

LIM

INA

TE

D.

3- F

OR

SIN

GLE

PH

AS

E M

OT

OR

S W

ITH

2 H

P, A

CO

NTA

CT

OR

IS U

SE

D.

4- IF

AN

Y O

F T

HE

OR

IGIN

AL

WIR

E, A

S S

UP

PLI

ED

, MU

ST

BE

R

EP

LAC

ED

, US

E T

HE

SA

ME

OR

EQ

UIV

ALE

NT

WIR

E.

5- T

HE

FIE

LD W

IRIN

G M

US

T C

OM

PLY

WIT

H A

PP

LIC

AB

LE

CO

DE

S, O

RD

ON

NA

NC

ES

AN

D R

EG

ULA

TIO

NS

.V

E00

33A

6 CCEX

HA

US

T L

O

R3/

C2-

3

5

21

NO

CO

M

6 CC

R2-

3

5

21

NC

CO

M

SU

PP

LYM

OTO

R

LO

LIN

E H

I G

W/Y

BK/Y

NO

TE

3

T4

1

2

3

4 G

6 CCS

UP

PLY

LO

R3/

C2-

1

5

21

NO

CO

M

R/Y

W/Y

R

DIS

CO

NN

EC

T O

PT

ION

SE

E N

OT

E 1

:

208

/ 230

/ 1

/ 60

G

BK

R

R/Y

G

6 CCEX

HA

US

T H

I

R3/

C2-

4

5

21

NO

CO

M

R

BK

/Y

EX

HA

US

TM

OTO

R

W/Y

BK/Y

NO

TE

3

T4

1

2

3

4 G

LO

LIN

E H

I G

R/Y

G

6 CCS

UP

PLY

HI

R3/

C2-

2

5

21

NO

CO

M

R

R/Y

W/Y

BK/Y

BK

R

R

W

1 2

3 4

5 6

L1C

L2C

L1T

5G G

T1

L2 W

J1 2 W

W/RJ1 8

R

BK

H2

X2

X1

H1

F2

W

BK

115V

TR

AN

SF

OR

ME

R T

R2

24V

R W

W/R

BL

W

BL

WB

L

BK

W

NO

34

BL

BK

BK

/BL

BK

/RB

K/Y

G G/R

O

CO

LOR

CO

DE

R R/Y

W W/B

LW

/RW

/YY

BLU

EB

LAC

KB

LAC

K/B

LUE

BLA

CK

/RE

DB

LAC

K/Y

ELL

OW

GR

EE

NG

RE

EN

/RE

DO

RA

NG

E

RE

DR

ED

/YE

LLO

WW

HIT

EW

HIT

E/B

LUE

WH

ITE

/RE

DW

HIT

E/Y

ELL

OW

YE

LLO

W

CC

R4-

1

1N

C

CO

M

NO

463

2 5 87

9

BK

/R R

J1 9

J1 4

BK/R

BK/Y

J1

1 W

BK

/YJ1

6

BK

/Y

W

W/B

LJ1

5

W

SU

P D

AM

PE

RM

OTO

R

C

O

N

G/R

BK/R

T3

3

2

1

W/R

EX

DA

MP

ER

MO

TOR

C

O

N

G/R

BK/R

T3

3

2

1

W/R

G/R

G/R

BK

/R W

/R W

/R

RE

LAY

3

12

0VA

C C

OIL

, DP

ST

3H

P, 2

40V

AC

RE

LAY

4

24

VA

C C

OIL

, TP

DT

10A

, 240

VA

C

3.9

K

Problem Cause SolutionUnit will not turn on. Occupied timer contacts open. Check external wiring.

Check the wiring in the control box.Check the control board for power.

Unit will not turn off. External terminal strip wiring. Check if high or low speed control contacts areclosed on the terminal strip.

Air from supply diffusers Imbalance of supply Check filters and heat exchanger for blockage.too cold. and exhaust air. Check balance of airflows. Install post heat module.

Unit makes an annoying Blower wheel out of alignment. Remove the motor/blower assembly noise. (see Service Section). Adjust blower wheel.

Enthalpy wheel wiper seal not Check for proper seal operation.functioning properly.(on ERV w20LCi only)

Heat exchanger freezing Imbalance of supply Check filters and heat exchanger for blockage.(on HRV 20LCi) or and exhaust air. Check balance of airflows.Enthalpy Wheel freezing Defrost damper not functioning. Check for operation of damper actuator.(on ERV w20LCi) Pre-heater not functioning. Check the heat module circuit breaker.

Enthalpy Wheel not running Enthalpy control con

Documents

20LCi and w20LCi Heat and Energy Recovery Ventilators ...v~user-guide...pressure to recover into static pressure. See the figure below. For 100% recovery of velocity pressure into