Greenheck Fan Heat Recovery Unit With Evaporative Cooling 45 Users Manual

HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING HRE-20 461248HRE_iom

HRE-90 461248HRE_iom_1

90 to the manual 776ffa43-544e-4e6a-976f-9ca3ac8b3c34

2015-02-09

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RECEIVING AND HANDLING

The HRE is thoroughly inspected and test run at the factory. However, damage may occur during

shipping and handling. Upon delivery, inspect the unit for both obvious and hidden damage.

If damage is found, record all necessary information on the bill of lading and file a claim with

the final carrier. In addition, ensure all accessory items are present. Some accessory items are

stored inside the unit during shipping.

SAFETY WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property

damage, injury or death. Read this installation, operation, and maintenance manual thoroughly

before installing or servicing this equipment. Installation and service must be performed by a

qualified installer, service agency, or the gas supplier.

PART #461248

READ AND SAVE THESE INSTRUCTIONS

HEAT RECOVERY UNIT

WITH EVAPORATIVE COOLING

Models: HRE-20, 45, 55, & 90

INSTALLATION, OPERATION AND MAINTENANCE

MANUAL

Indirect Evaporative Cooler

(Exhaust/Scavenger Airstream)

Direct Evaporative Cooler

(Outdoor/Supply Airstream)

INSTALLATION SUPPLEMENT

Refer to the following

installation supplement for

HRE units when supplied with

Indirect Gas (IG) heating:

Model PVF, Indirect Gas

Fired Furnaces for Energy

Recovery Units, Part #461006

SAVE THIS MANUAL

This manual is the property

of the owner, and is required

for future maintenance. This

manual should remain with

each HRE unit when the job

is complete.

TABLE OF CONTENTS

Storage and Basic Operation ..............2

Installation ..............................3

Lifting .................................3

Unit Weights & Recommended Roof

Openings ............................3

Roof Curb Mounting .....................4

Rail Mounting ...........................5

Ductwork Connections ...................5

Electrical Information...................6-7

Service Clearances ......................8

Dimensional Data/Access Door Description ..9

Evaporative Cooling Modules

Evap Module Installation and Start-Up ..10-11

Water Supply Connection Location ........11

Water Control Options................12-13

Drain & Overflow Connection Locations ....14

Troubleshooting........................15

Maintenance...........................16

Optional Accessories .................17-28

Electric Heater Application/Operation ......17

Frost Control Application/Operation........18

Economizer Application/Operation.........19

Variable Frequency Drives ............20-21

Typical Wiring Diagram ..................22

Sensors and Lights ..................23-24

Remote Control Panel & Wiring ........25-27

Sensors Mounted by Factory .............28

Start-Up Checklist

Unit ...............................29-30

Evaporative Cooler .....................30

Optional Accessories....................31

Fan ...............................32-33

Energy Recovery Wheel .................34

Routine Maintenance Checklist...........35

Belts and Motors .......................36

Blower Wheel and Fasteners .............36

Bearings, Filters and Door Seal ...........37

Energy Recovery Wheel Maintenance .....38

Accessing Energy Recovery Wheel ........38

Removing Wheel Segments ..............38

Cleaning Wheel Segments ...............39

Parts List ..............................40

Sequence of Operation ..................41

Troubleshooting Airflow .................42

Unit Troubleshooting .......43 and Backcover

Warranty ........................Backcover

STORAGE

When a unit is not going to be in service for an extended amount of time, certain procedures should be

followed to keep the fans in proper operating condition.

 •Rotatefanwheelmonthlyandpurgegreasefrombearingsonceeverythreemonths

 •Coverunitwithtarptoprotectfromdirtandmoisture(Note:donotuseablacktarpasthiswillpromote

condensation)

 •Energizefanmotoronceeverythreemonths

 •Storebeltsflattokeepthemfromwarpingandstretching

 •Storeunitinlocationwhichdoesnothavevibration

 •Afterstorageperiod,purgegreasefromfanbearingsbeforeputtingfanintoservice

If storage of unit is in a humid, dusty or corrosive atmosphere, rotate the fan and purge the bearings once a

month. Improper storage which results in damage to the unit or components will void the warranty.

BASIC OPERATION

The HRE brings in fresh, outdoor air and

removes stale, exhaust air. For summer

operation, the exhaust air flows through an

evaporative cooler (indirect) to lower the

air temperature. A sensible recovery wheel

transfers energy from the exhaust air to

the outdoor air at an efficiency of 70-80%

to reduce the temperature of the outdoor

air. The outdoor air can then flow thru an

optional evaporative cooler (direct) to further

reduce the temperature of the outdoor air.

The sensible wheel also recovers heat from

the exhaust in the winter to precondition the

outdoor air. Optional heaters are available

after the wheel for final tempering.

Outdoor Air

Exhaust Air

discharged outside

Exhaust Air

from building

Conditioned Air

sent to space

Optional

Heater

Sensible

Recovery

Wheel

Indirect

Evaporative

Cooler

Direct

Evaporative

Cooler

INSTALLATION

The system design and installation should follow

accepted industry practice, such as described in the

ASHRAE Handbook.

Adequate space should be left around the unit for piping

coils and drains, filter replacement, and maintenance.

Sufficient space should be provided on the side of the

unit for routine service and component removal should

that become necessary.

See Service Clearances/Access Panel Locations section

for more details.

LIFTING

1) Before lifting, be sure that all shipping material has

been removed from unit.

2) To assist in determining rigging requirements,

weights are shown below.

3) Unit must be lifted by the eight lifting lugs provided

on base structure.

4) Rigger to use suitable mating hardware to attach to

unit lifting lugs.

5) Spreader bar(s) must span the unit to prevent

damage to the cabinet by the lift cables.

6) Always test-lift the unit to check for proper balance

and rigging before hoisting to desired location.

 7) Neverliftunitsbyweatherhoods.

 8) Neverliftunitsinwindyconditions.

9) Preparation of curb and roof openings should be

completed prior to lifting unit to the roof.

10) Check to be sure that gasketing (supplied by others)

has been applied to the curb prior to lifting the unit

and setting on curb.

11) Do not use fork lifts for handling unit.

Lift using

lifting lugs and

spreader bar

UNIT WEIGHTS & RECOMMENDED ROOF OPENING

SUPPLY

OUTLET

EXHAUST

INLET

0.50

Unit Size Approx. Dry Weight

(lbs)

Approx. Wet Weight

(lbs) U V

HRE-20 1660 1800 46 37

HRE-45 2580 2840 54 39

HRE-55 2950 3320 65 47

HRE-90 4750 5400 85 49

SAFETY WARNING

All factory provided lifting lugs must

be used when lifting the units. Failure

to comply with this safety precaution

could result in property damage,

serious injury, or death.

Unit weights assume indirect evap, direct evap, and IG furnace.

All dimensions shown are in inches.

Position the unit roof opening such that the supply discharge and exhaust inlet of the unit will line up with the

corresponding ductwork. Be sure to allow for the recommended service clearances when positioning opening

(see Service Clearances). Do not face the outdoor air inlet of the unit into prevailing wind and keep the supply

inlet of the unit away from any other exhaust fans. Likewise, position the exhaust discharge opening away from

fresh air intakes of any other equipment.

When cutting only duct openings, cut opening 1 inch (25mm) larger than duct size to allow clearance for

installation. Area enclosed by roof curb must comply with clearance to combustible materials. If the roof is

constructed of combustible materials, area within the roof curb must be ventilated, left open, or covered with

non-combustible material which has an ÒRÓ value of at least 5. If area within curb is open, higher radiated

sound levels may result.

Where the supply or warm air duct passes thru a combustible roof, a clearance of one inch must be maintained

betweentheoutsideedgesoftheductandcombustiblematerialinaccordancewithNFPAStandard90A.

Rooftop units require curbs to be mounted first. The duct connections must be located so they will be clear of

structural members of the building.

1. Factory Supplied Roof Curbs

Roof curbs are Model GKD, which are shipped in a

knockdown kit (includes duct adapter) and require field

assembly (by others). Assembly instructions are included

with the curb.

2. Install Curb

Locate curb over roof opening and fasten in place. (Refer

to Recommended Roof Openings). Check that the diagonal

dimensions are within ±1/8 inch of each other and adjust as

necessary. For proper coil drainage and unit operation, it is

important that the installation be level. Shim as required to

level.

3. Install Ductwork

Installation of all ducts should be done in accordance with

SMACNAandAMCAguidelines.Ductadapterprovidedto

support ducts prior to setting the unit.

4. Set the Unit

Lift unit to a point directly above the curb and duct

openings. Guide unit while lowering to align with duct

openings. Roof curbs fit inside the unit base. Make sure the

unit is properly seated on the curb and is level.

All dimensions shown are in inches.

Curb Outside Dimensions

Roof curb details, including duct location

dimensions, are available on HRE roof curb

assembly instructions.

ROOF CURB

SIDE OF UNIT

BASE

1 INCH INSULATION

Curb Outside Dimensions Weight

Model L W

HRE-20 93 51 280

HRE-45 100.5 60.63 355

HRE-55 112.75 71.5 450

HRE-90 125.75 90.75 625

Model Curb Cap Dimensions

A B C D E

HRE-20 2.00 2.00 1.00 0.88 0.75

HRE-45 2.00 4.25 2.00 1.31 0.50

HRE-55 2.00 4.25 2.00 1.31 0.50

HRE-90 2.00 4.25 2.00 1.31 0.50

All dimensions shown are in inches.

Curb CAP Details for Factory Supplied Roof Curbs

ROOF CURB MOUNTING

1 Fan

Wheel

Dia.

1 Fan

Wheel

Dia.

Length of Straight Duct

GOOD

POOR

GOODPOOR

GOOD POOR

Tu rning

Vanes

Tu rning

Vanes

SYSTEM EFFECT FACTOR CURVES

FPM X 100

OUTLET VELOCITY

0 5 10 15 20 25 30 35 40 45

1.2

1.0

0.8

0.6

0.4

0.2

0.0

STATIC PRESSURE LOSS

CURVE 1

CURVE 2

CURVE 3

CURVE 4

1 Fan

Wheel

Dia.

1 Fan

Wheel

Dia.

Length of Straight Duct

GOOD

POOR

GOODPOOR

GOOD POOR

Tu rning

Vanes

Tu rning

Vanes

SYSTEM EFFECT FACTOR CURVES

FPM X 100

OUTLET VELOCITY

0 5 10 15 20 25 30 35 40 45

1.2

1.0

0.8

0.6

0.4

0.2

0.0

STATIC PRESSURE LOSS

CURVE 1

CURVE 2

CURVE 3

CURVE 4

DUCTWORK CONNECTIONS

Examples of good and poor fan-to-duct connections are shown below. Airflow out of the fan should be directed

straight or curve the same direction as the fan wheel rotates. Poor duct installation will result in low airflow and

other system effects.

Rail Layout

• RailsdesignedtohandletheweightoftheHREshouldbe

positioned as shown on the diagram (rails by others).

• Makesurethatrailpositioningdoesnotinterferewiththesupply

air discharge opening or the exhaust air intake opening on the

HRE unit. Avoid area dimensioned “B” below

• Railsshouldrunthewidthoftheunitandextendbeyondtheunit

a minimum of 12 inches on each side.

• Setunitonrails.

SUPPLY/EXHAUST

OPENING

OUTDOOR

AIR

INTAKE

HOOD

SUPPLY/EXHAUST

OPENING

OUTDOOR

AIR

INTAKE

HOOD

Isometric view of HRE on rails

Side view of HRE on rails

Dimensions shown are in inches.

SUPPLY WEATHERHOOD

Supply weatherhood will be factory mounted.

EXHAUST WEATHERHOOD

The exhaust weatherhood is shipped separately as a kit with its own

instructions.

DAMPERS

Backdraft dampers are always included as an integral part of the

exhaust hood assemblies. Motorized outdoor air and exhaust air

dampers are optional and are factory mounted (and wired) at the

inlet.

RAIL MOUNTING

Recommended Discharge Duct Size and Length

HRE Model HRE Blower Size Duct Size Straight Duct Length

HRE-20 10 14 x 14 40

HRE-45 12 20 x 20 48

HRE-55 15 28 x 28 60

HRE-90 18 32 x 32 72

Model Rail Mounting

A B

HRE-20 5.1 25.0

HRE-45 7.1 25.1

HRE-55 5.7 35.0

HRE-90 6.6 36.1

All dimensions shown are in inches.

ELECTRICAL INFORMATION

TheunitmustbeelectricallygroundedinaccordancewiththecurrentNationalElectricalCode,ANSI/NFPA

No.70.InCanada,usecurrentC.S.A.StandardC22.1,CanadianElectricalCode,Part1.Inaddition,theinstaller

should be aware of any local ordinances or electrical company requirements that might apply. System power

wiring must be properly fused and conform to the local and national electrical codes. System power wiring is to

the unit main disconnect (door interlocking disconnect switch standard on most units) or distribution block and

mustbecompatiblewiththeratingsonthenameplate:supplypowervoltage,phase,andamperage(Minimum

Circuit Amps - MCA, Maximum Overcurrent Protection - MOP). All wiring beyond this point has been done by

the manufacturer and cannot be modified without affecting the unit’s agency / safety certification.

If field installing an additional disconnect switch, it is recommended that there is at least four feet of service

room between the switch and system access panels. When providing or replacing fuses in a fusible disconnect,

use dual element time delay fuses and size according to the rating plate.

If power supply is desired thru bottom of unit, run the wiring through the curb, cut a hole in the cabinet bottom,

and wire to the disconnect switch.

The electric supply to the unit must meet stringent requirements for the system to operate properly. Voltage

supply and voltage imbalance between phases should be within the following tolerances. If the power is not

within these voltage tolerances, contact the power company prior to operating the system.

Voltage Supply - See voltage use range on the rating plate. Measure and record each supply leg voltage at all

line disconnect switches. Readings must fall within the allowable range on the rating plate.

Voltage Imbalance - In a 3-phase system, excessive voltage imbalance between phases will cause motors

to overheat and eventually fail. Maximum allowable imbalance is 2%. To determine voltage imbalance, use

recorded voltage measurements in this formula.

Key: V1,V2,V3=linevoltagesasmeasured

 VA(average)=(V1+V2+V3)/3

 VD=Linevoltage(V1,V2orV3)thatdeviatesfarthestfromaverage(VA)

Formula: %VoltageImbalance=[100x(VA-VD)]/VA

Most factory supplied electrical components are pre-wired. To determine what electrical accessories require

additional field wiring, refer to the unit specific wiring diagram located on the inside of the unit control center

access door. The low voltage control circuit is 24 Vac and control wiring should not exceed 0.75 ohms. Refer to

Field Control Wiring Length/Gauge table for wire length maximums for a given wire gauge. Control wires should

not be run inside the same conduit as that carrying the supply power. Make sure that field supplied conduit

does not interfere with access panel operation.

CAUTION

If any of the original wire as supplied with the appliance must be replaced, it must be

replaced with wiring material having a temperature rating of at least 105ºC.

WARNING

To prevent injury or death due to electrocution or

contact with moving parts, lock disconnect switch

open.

WARNING

For units with a gas furnace, if you turn off the

power supply, turn off the gas.

Field Control Wiring Length/Gauge

Total Wire Length Minimum Wire Gauge

125 ft. 18

200 ft. 16

300 ft. 14

450 ft. 12

If wire resistance exceeds 0.75 ohms, an industrial-style, plug-in relay should be added to the unit control

center and wired in place of the remote switch (typically between terminal blocks R and G on the terminal strip

(refer to Typical Control Center Components). The relay must be rated for at least 5 amps and have a 24 Vac

coil. Failure to comply with these guidelines may cause motor starters to “chatter” or not pull in which can

cause contactor failures and/or motor failures.

Note: Standard factory installed electric post-heaters have their own disconnect separate from the unit

disconnect. Thus, each electric post-heater requires its own separate power connection.

1. Main Disconnect (non-fusible, lockable)

2. Motor Starter - Exhaust Air Fan

3. Motor Starter - Outdoor Air Fan

4. Motor Contactor - Energy Wheel

5. 24 VAC Control Transformer

6. 24 VAC Terminal strip

7. Fuses for blower motors

8. Motor Contactor - Indirect Evap Pump

9. Motor Contactor - Direct Evap Pump

10. Evap Pump Transformer

(115 VAC Secondary)

TYPICAL CONTROL CENTER COMPONENTS

2 3 4 8 9

Exploded Detail

of Terminal Strip

Wheel Cassette

2 in. ﬁlters

Direct

Evap

Section

Exhaust Air

Intake

Electrical Box

Access Panel

Cassette

Slides Out

52 in.

Clearance with

IG Heater

0 in.

Clearance without

IG Heater

Exhaust

Hood

Outdoor Air Hood

IG Heater

*48 in. **64 in.

36 in.

TOP VIEW

Indirect

Evap

Section

SERVICE CLEARANCES / ACCESS PANEL LOCATIONS

HRE-20, 45, 55, and 90 units require minimum clearances for access on all sides for routine maintenance. Filter

replacement, drain pan inspection and cleaning, energy wheel cassette inspection, fan bearing lubrication and

belt adjustment, are examples of routine maintenance that must be performed. Blower and motor assemblies,

energy recovery wheel cassette, coil and filter sections are always provided with a service door or panel for

proper component access. Clearances for component removal may be greater than the service clearances,

refer to drawings below for these dimensions.

Wheel Cassette

2 in. ﬁlters

Exhaust Air

Intake

Electrical Box

Access Panel

52 in.

Clearance with

IG Heater

0 in.

Clearance without

IG Heater

Exhaust

Hood

Outdoor Air Hood

IG Heater

42 in.

TOP VIEW

Direct

Evap

Section

Indirect

Evap

Section

Clearances for service and component removal on HRE-20 and HRE-45

* Clearance for energy wheel removal on HRE-20

** Clearance for energy wheel removal on HRE-45

HRE-20

HRE-45

HRE-55

HRE-90

Clearances for service and component removal on HRE-55 and HRE-90

DIMENSIONAL DATA / ACCESS DOOR DESCRIPTIONS

Following is a list of items accessible through the access

doors shown on the diagram at the right. Some items are

optional and may not have been provided.

1) Exhaust blower, motor, and drives

2) Aluminum mesh filters (intake hood)

3) Energy recovery wheel, motor, belt, and seals

Outdoor air filters

Outdoor air intake damper (optional)

Electric preheater (optional)

Frost control sensors (optional)

Economizer sensors (optional)

4) Direct evaporative cooler, drain pan,

and pump (optional)

5a) Outdoor air blower, motor, and drives

(without indirect gas furnace)

5b) Outdoor air blower, motor, and drives

(with indirect gas furnace)

6) Control center

All electrical controls

VFDs for blowers (optional)

VFD for energy recovery wheel (optional)

7) Indirect evaporative cooler, drain pan, and pump

Exhaust air filters

Exhaust air intake damper (optional)

Dimensional data and

access door locations

Model

Exterior Dimensions

A B C D E F G H I

HRE-20 98 50 56 18 28.5 17 6 14.25 18

HRE-45 106 69 66 16 41 23.375 10.5 13.375 20

HRE-55 118 70 76 16 59.5 5.875 7.125 21.25 25

HRE-90 131 85 96 16 78 2.875 10 24.5 27

Model

Overall Exterior Dimensions

Width

(including Lifting Lugs)

Overall Width

(with Exhaust Hood)

Overall Length

(with Outdoor Air Hood)

HRE-20 59.5 75 116

HRE-45 69.5 86 122

HRE-55 79.5 101 134

HRE-90 99.5 123 147

All dimensions shown are in inches.

5a 4

1. After the energy recovery unit is set in place, run the

overflow and drain lines to the exterior fittings on the

evaporative cooler (drain & overflow connections at

unit are 1-inch male pipe thread). The supply line can

be attached at the downstream side of the evaporative

cooler. A manual shut off valve should be mounted in

the supply line near the unit for servicing purposes.

Also, a trap should be installed in the drain line to

prevent air/sewer gas from being drawn into the unit

(refer to Drain and Overflow Connection Locations and

Drain Trap sections). Run bleed line into overflow.

EVAP MODULE START-UP

1. The cooler will be prewired by the factory. (pumps are 115VAC).

2. Check to make sure that the pump filter is around the pump inlet.

3. Turn the water on and allow the sump to fill. Adjust the float valve to shut-off the water supply when the

sump is filled to a 1-inch height.

4. Open the bleed-off valve completely and saturate the media without any airflow through the unit. A jumper

wire is required on the terminal strip to provide power to the evaporative cooler pump (see the wiring

diagram for the proper location). This saturation process will break-in the media and minimize the odors

associated with the media. The media’s break-in period should

be no less than 20 minutes. When the process is complete,

remove the jumper wires in the control center.

Note:Evaporativemediamayfoamforashortperiod

following the initial start-up. Leave the bleed-off

valve fully open until the foaming stops.

5. After the media break-in period, the

water flow rate over the media needs to be

checked. The pumps should provide enough

water to saturate the media in 1-3

minutes. If adequate flow rate is

not achieved, adjust via water

flow adjustment device found on

water supply line running to evap

header.

6. The water bleed-off rate will now need to be adjusted.

This measurement is 3 to 6 percent of the media flow

rate. The recommended flow rate is 11/2 to 2 GPM

per square foot of media pad top area (see table at

right). Actual water to the unit will be based on the

evaporation rate. A water flow adjustment device is

supplied and installed by Greenheck for ease of water

flow adjustments. After the unit has been installed and

running for two weeks the unit should be checked for

mineral deposits. If there are deposits, the bleed-off

rate needs to be increased. Some areas of the country

have water with greater amounts of dissolved minerals

requiring a higher bleed-off rate.

Mount the heat recovery unit level to ensure proper

operation and water drainage. Piping should be of

adequate size to provide sufficient supply of water to meet

the maximum demand of the evaporative coolers.

EVAP MODULE INSTALLATION

EVAPORATIVE COOLING MODULES

Indirect Evaporative Cooler

(Exhaust/Scavenger Airstream)

Direct Evaporative Cooler

(Outdoor/Supply Airstream)

Roof Curb

Roof Line

Drain

Line

Trap

Overflow

Drain Line

Manual

Shutoff

Valve

Evaporative

Cooling

Media

Manual Shutoff Valve

Supply Line

Sump

Side of HRE Unit

Standard Trap and Supply Line Configuration

Media Size

(w x h x d) (in.)

Media Pad

Top Area

HRE-20 Supply

Exhaust

18 x 36 x 12

1.5 ft2

HRE-45 Supply

Exhaust

30 x 48 x 12

24 x 48 x 12

2.5 ft2

2.0 ft2

HRE-55 Supply

Exhaust

36 x 56 x 12

30 x 56 x 12

3.0 ft2

2.5 ft2

HRE-90 Supply

Exhaust

48 x 69.5 x 12

40 x 69.5 x 12

4.0 ft2

3.3 ft2

7. Verify that both airflow and system static pressure are in agreement with the specifications. If these

conditions are met, check for water carry over from the discharge side of the media. If carry over is

observed, check the distribution header for holes or tears and the water standoff tube for blockage.

8. After all final adjustments are made, remove the jumper wires, connect “call for cooling” signal, and replace

all access panels. The unit is now ready for operation.

Bleed-Off

Valve

Overflow Pump

Filter

Threaded

Float

Adjustment

Supply

Connection

Float

Valve

Pump and Float Components

HRE WATER SUPPLY CONNECTION LOCATION

Ø0.875

Run 1/4 inch line up through 7/8 inch

hole here and bring around end

of sump to supply connection.

Ø0.875

Run 1/4 inch line up through 7/8 inch

hole here and bring around end

of sump to supply connection.

OA INLET

EA INLET

1/4 inch Water Supply Connection

Model Water Supply Connection Locations

A B C D

HRE-20 37.375 4.625 4.625 39.25

HRE-45 38.75 4.625 4.625 43.00

HRE-55 43.50 4.625 4.625 46.125

HRE-90 43.50 4.625 4.625 52.625

Dimensions from outside of unit (in inches)

Top View

Water Flow Adjustment Device

Evaporative

Timer

Evaporative

Freeze

Protection

t2 settings

t1 settings

Temperature

Setting

AUTO DRAIN AND FILL WITH FREEZE PROTECTION

This system will automatically drain the sump tank and fill it with

fresh water at the field adjustable intervals, typically once every 24

hours. This flushes mineral build-up and debris from the tank to

promote low maintenance and increase media pad life. In addition,

the system will protect the evaporative cooler from freezing

by draining the sump tank and supply line when the outside

temperatures fall below the set point of the outside air sensor.

Typically, this is set at 45º to 50º F. The auto drain and fill outdoor

air sensor should be installed in an area that is shaded from direct

sunlight so the outside air sensor probe will detect an accurate air

temperature.Setthetimer.Timersettingsaret1:1.0,10minand

t2:0.4,60h

PLUMBING FOR AUTO DRAIN AND FILL

1. Run water supply line to the unit and install Water Supply Solenoid Valve (A) in this line as close to the

water source as possible.

2. Install Drain Solenoid Valve (B) in the supply line as indicated below. From the outlet on the drain valve,

run line to a suitable drain location.

3. Run an unobstructed drain line from the sump overflow to the drain trap as shown below.

4. Install Sump Drain Solenoid Valve (C) in the drain line from the sump as indicated below. From the outlet

on this drain valve, run a line to a suitable drain location.

Note: Water Supply Solenoid Valve (A) is not the same as the Drain Solenoid valves (B) and (C). Make sure to

use the proper valve for each location. Check your local code requirements for proper installation of this

type of system. Additional drain and supply plumbing may be needed to meet your local code.

Caution: All solenoid valves A, B, and C must be installed below the roof to protect the supply water line from

freezing. If these valves cannot be installed below the roof, an alternate method must be used to protect these

lines from freezing.

WATER CONTROL OPTIONS FOR EVAPORATIVE COOLING

Trap & Supply Line Configuration

with Auto Drain and Fill

COM

TIMER

JOHNSON CONTROLLER

24VAC COMSENSOR

24V AC POWER AND WIRING

BY OTHERS

SENSOR

OUTDOOR AIR

VALVE "A"

VALVE "B"

VALVE "C"

TIMER

OUTDOOR AIR SENSOR

AUTO DRAIN AND FILL WITH FREEZE PROTECTION

PART DESCRIPTIONS

VALVE, WATER SUPPLY (A)

VALVE, DRAIN (B)

VALVE, SUMP DRAIN (C)

24 HOUR TIMER

JOHNSON CONTROLLER

GREENHECK P/NQTY.

07458032 1

07381940 1

05461262 1

05461263 1

05461264 1

OUTDOOR AIR SENSOR 07458298 1

1/2 PIPE SIZE (NC)

1/4 PIPE SIZE (NO)

3/4 PIPE SIZE (NO)

HOLDING VA INRUSH VA

SUMP

EVAPORATIVE

COOLING MEDIA

ROOF CURB

ROOF LINE

TRAP

DRAIN LINE

SUPPLY LINE

WATER SUPPLY SOLENOID VALVE (A)–NORMALLY CLOSED

1/2 INCH PIPE SIZE

DRAIN SOLENOID VALVE (B)–NORMALLY OPEN

1/4 INCH PIPE SIZE

SUMP DRAIN SOLENOID VALVE (C)–NORMALLY OPEN

3/4 INCH PIPE SIZE

SIDE OF HRE UNIT

SUMP DRAIN PIPE

(TO EACH EVAP)

SUMP OVERFLOW PIPE

(TO EACH EVAP)

THE SYSTEM WILL AUTOMATICALLY DRAIN THE SUMP TANK AND FILL IT WITH FRESH WATER AT THE FIELD ADJUSTABLE INTERVALS, TYPICAL SETTINGS ARE t1 = 24HRS

t2 = 10 MIN. WITH THE DIP SWITCH IN THE DOWN POSITION. THIS FLUSHES MINERAL BUILD-UP AND DEBRIS FROM THE TANK TO PROMOTE LOW MAINTENANCE AND

INCREASE MEDIA PAD LIFE. IN ADDITION, THE SYSTEM WILL PROTECT THE EVAPORATIVE COOLER FROM FREEZING BY DRAINING THE SUMP TANK AND SUPPLY LINE

WHEN THE OUTSIDE TEMPERATURES FALL BELOW THE SET POINT OF THE OUTDOOR AIR SENSOR. TYPICALLY, THIS IS SET AT 45° TO 50° F. THE AUTO DRAIN AND FILL

OUTDOOR AIR SENSOR SHOULD BE INSTALLED IN AN AREA THAT IS SHADED FROM DIRECT SUNLIGHT SO THE SENSOR PROBE WILL DETECT AN ACCURATE AIR

TEMPERATURE.

THE FOLLOWING COMPONENTS SHIP FROM GREENHECK WITH HRE (INSTALLATION, WIRING, AND POWER BY OTHERS)

WATER LINE CONNECTION

AT FLOAT IS 1/4 INCH

Coolingcoilsareprovidedwithastainlesssteeldrainpanwith3/4-in.femaleNPTdrainconnection.Adrain

trap must be connected to the drain connection to allow excess water to flow out of the drain pan. More

importantly, though, due to the negative internal static of the cooling coil compartment, installing the drain trap

prevents outdoor air from being pulled into the drain pan and consequently forcing water out of the pan and

into the unit.

To ensure the drain trap works properly, the trap height must account for the difference in static pressure

between ambient conditions outside the unit and the internal

negative pressure of the cooling coil compartment. For energy

recovery units, an assumption of 3.0 in. wg. differential will be

sufficient. This would require a trap design as shown. If the

internal static is believed to be higher, consult factory.

Refer to local codes to determine drainage requirements. If

draining onto to roof, place a drip pad below drain to protect

roof. If draining onto roof is not acceptable, a drain line must be

attached to the trap. The drain line must be pitched away from

the unit at least 1/8-in. per foot. On longer runs, an air break should be used to ensure proper drainage. Local

codes may require drainage into a waste water system.

Drainage problems not only occur from improper drain trap design, but also from lack of maintenance of the

cooling coil compartment. Algae can form in the drain pan and trap and cause reduced water flow, which can

in turn result in backup into the system. Regular maintenance will prevent this from occurring. If the drains have

a cleanout opening, be sure to close the opening after cleaning.

COM

TIMER

JOHNSON CONTROLLER

24VAC COMSENSOR

24V AC POWER AND WIRING

BY OTHERS

SENSOR

OUTDOOR AIR

VALVE "A"

VALVE "B"

VALVE "C"

TIMER

OUTDOOR AIR SENSOR

AUTO DRAIN AND FILL WITH FREEZE PROTECTION

PART DESCRIPTIONS

VALVE, WATER SUPPLY (A)

VALVE, DRAIN (B)

VALVE, SUMP DRAIN (C)

24 HOUR TIMER

JOHNSON CONTROLLER

GREENHECK P/NQTY.

07458032 1

07381940 1

05461262 1

05461263 1

05461264 1

OUTDOOR AIR SENSOR 07458298 1

1/2 PIPE SIZE (NC)

1/4 PIPE SIZE (NO)

3/4 PIPE SIZE (NO)

HOLDING VA INRUSH VA

SUMP

EVAPORATIVE

COOLING MEDIA

ROOF CURB

ROOF LINE

TRAP

DRAIN LINE

SUPPLY LINE

WATER SUPPLY SOLENOID VALVE (A)–NORMALLY CLOSED

1/2 INCH PIPE SIZE

DRAIN SOLENOID VALVE (B)–NORMALLY OPEN

1/4 INCH PIPE SIZE

SUMP DRAIN SOLENOID VALVE (C)–NORMALLY OPEN

3/4 INCH PIPE SIZE

SIDE OF HRE UNIT

SUMP DRAIN PIPE

(TO EACH EVAP)

SUMP OVERFLOW PIPE

(TO EACH EVAP)

THE SYSTEM WILL AUTOMATICALLY DRAIN THE SUMP TANK AND FILL IT WITH FRESH WATER AT THE FIELD ADJUSTABLE INTERVALS, TYPICAL SETTINGS ARE t1 = 24HRS

t2 = 10 MIN. WITH THE DIP SWITCH IN THE DOWN POSITION. THIS FLUSHES MINERAL BUILD-UP AND DEBRIS FROM THE TANK TO PROMOTE LOW MAINTENANCE AND

INCREASE MEDIA PAD LIFE. IN ADDITION, THE SYSTEM WILL PROTECT THE EVAPORATIVE COOLER FROM FREEZING BY DRAINING THE SUMP TANK AND SUPPLY LINE

WHEN THE OUTSIDE TEMPERATURES FALL BELOW THE SET POINT OF THE OUTDOOR AIR SENSOR. TYPICALLY, THIS IS SET AT 45° TO 50° F. THE AUTO DRAIN AND FILL

OUTDOOR AIR SENSOR SHOULD BE INSTALLED IN AN AREA THAT IS SHADED FROM DIRECT SUNLIGHT SO THE SENSOR PROBE WILL DETECT AN ACCURATE AIR

TEMPERATURE.

THE FOLLOWING COMPONENTS SHIP FROM GREENHECK WITH HRE (INSTALLATION, WIRING, AND POWER BY OTHERS)

WATER LINE CONNECTION

AT FLOAT IS 1/4 INCH

4 in.

2 in.

DRAIN TRAP

DRAIN AND OVERFLOW CONNECTION LOCATIONS

Model

Connection Locations - in inches

Outdoor Air Side Exhaust Side

A B C D A B C D

HRE-20 4.00 2.875 40.75 42.25 4.00 2.875 52.25 53.75

HRE-45 6.25 5.125 42.625 44.125 6.25 5.125 56.50 58.00

HRE-55 6.375 5.125 53.00 54.50 6.375 5.125 66.375 67.875

HRE-90 6.375 5.125 47.25 48.50 6.375 5.125 71.00 72.25

3/4 INCH INDIRECT EVAP DRAIN AND

OVERFLOW CONNECTIONS

EXHAUST AIR

DISCHARGE

COMPARTMENT

EXHAUST AIR

INTAKE

COMPARTMENT

Exhaust

OUTDOOR AIR

DISCHARGE

COMPARTMENT

OUTDOOR

AIR

INTAKE

COMPARTMENT

3/4 INCH DIRECT EVAP DRAIN AND

OVERFLOW CONNECTIONS

Outdoor Air

Symptom Solution

Leaving Air

Entering Air

Insufficient water

volume or recirculation

pump not operating

Irregular water

distribution on cooling

media

Scale and mineral

deposit formation on

face of media

Excessive water

discharge into drain

Water Carry-Over

Poor performance

after cooling pad

replacement

Inadequate cooling

A. Check water level in base pan. The

level should be at 1 inch.

B. Check the pump filter at the inlet.

Clean the filter if clogged or dirty.

C. If pump is not operating, check

wiring for loose connections and

proper voltage.

D. Clogged or worn out pump.

E. Clogged header.

F. Water flow adjustment device

Water distribution header, orifices or media partially blocked or plugged.

Remove evaporative cooler from unit.

Disassemble and clean distribution header, orifices and media.

A. Increase bleed rate.

B. Increase water flow rate. Media is self-cleaning with flow rate of 11/2 to 2

gpm per square foot of media top area. Generally this flow rate prevents

dissolved solvents from collecting on the media. To prevent further

trouble, flush and clean the system more frequently.

C. Check water flow across the face of the media. Irregular water distribution

must be corrected (see above)

D. If this condition persists, chemicals may need to be added. Water pH

should be maintained between 6 and 8.

A. Irregular water distribution on face of media (see above).

B. Average face velocity exceeds 550 fpm. Decrease fan rpm and airflow.

C. Localized face velocities exceeding 550 fpm. Air filters or media face area

is partially blocked. Clean or replace air filters and media.

D. Check the overflow for blockage.

A. Irregular water distribution over face of media (see above).

B. Check for uniform airflow.

C. Check outside wet-bulb temperature. High wet-bulb temperatures can

decrease performance.

D. Check water flow rate over media. Flow rate should be 11/2 to 2 gpm per

square foot of media top area.

A. Check the water bleed off rate and make sure that it is not excessive.

B. Check water level in base pan. The level should be at 1 inch.

Pad installed backwards. To get the

performance from the cooling pads,

they must be installed properly. The

pads are manufactured with 15/45

degree flute angles. The pads must

always be installed with the steeper

flute angle sloping down toward the

entering air side. See figure on right.

TROUBLESHOOTING FOR EVAPORATIVE MODULE

Header

Detail

Regularly scheduled maintenance is the key to peak

performance, minimized cost, and extended life of

the evaporative cooler. The following is a checklist of

items that need to be looked at on a regular basis.

1. The media should be checked for mineral and

foreign material deposits that have built up. If

these items are left on the media, the life and

performance of the unit will be greatly reduced.

Also, there are risks of water carryover when

this type of condition exists. When signs of

mineral build-up are noticed, you should increase

the bleed off rate. If this does not solve the

problem, chemicals may need to be added to

the water. The evaporative pads tend to be self-

cleaning. Depending on water quality and system

maintenance, the useful life of the pads should

be 3 to 5 years.

2. The media should be periodically brushed lightly

with a soft bristle brush in an up and down

motion (never brush side-to-side) while flushing

with water. This will also aid in reducing the

amount of foreign material build-up.

3. The water should be shut off and all the lines

drained when the temperature drops below 50ºF.

4. When the evaporative cooler is going to be used

for the first time each season, it is recommended

that the media be flushed with clean water for a

period of 2 minutes (see Evap Module Start-Up).

5. At the beginning of each cooling season, the

upright recirculating pump should have the

shaft oiled and spun to eliminate the potential of

seizing and pump burn out.

6. If the cooling media was removed from the

unit, check to make sure that is not installed

backwards. If the media is installed backwards,

there will be large amounts of water carry

over downstream of the evaporative cooler.

Continuous operation in this manner may cause

serious damage and void the warranty.

7. At the end of each cooling season the

evaporative cooler should be thoroughly

cleaned. A dispersant and biocide (consult water

treatment consultant for suitable materials and

dosage levels) should be recirculated for 12 to 24

hourspriortoperformingthefollowingsteps:

a) Disconnect power to unit.

b) Shut off all water to the unit

c) Open evaporative cooling section door

d) Flush distribution headers and media for 20

minutes

e) Turn off pumps and drain all water distribution

piping, headers, etc.

f) Dry media completely by running blowers.

g) Brush media as described in Paragraph 2 and

perform steps d and e again.

h) Clean all remaining components (i.e. sump,

pump, etc.) of any mineral deposits or foreign

materials

i) Replace all worn or non-functioning parts

j) Reassemble the cooling unit.

k) Close cooling section door.

l) Turnthemaindisconnect‘ON’,leavingthe

cooling switch in the ‘OFF’ position.

8. If the evaporative cooler will be turned off during

the cooling season for an extended period of

time, it is recommended that the media be dried

out. This can be accomplished by allowing the

blowers to continue to run for 1-2 hours. Doing

so, will prevent organic build-up on the media

and subsequent odors getting into the space.

9. Media should be permitted to dry once per week

by allowing the blowers to run for 1-2 hours.

10. A flush cycle should be performed weekly for one

hour with the fans off.

To remove media, disconnect water line to evap

header as shown below. Then slide media section

out of unit. Sump will remain in unit. If media is wet,

turn off water supply, then turn on unit and allow air

to flow thru media for 10 -20 minutes. This will dry the

media out and make it lighter and easier to handle.

EVAPORATIVE COOLING MAINTENANCE

IMPORTANT

Replacement media should be from the same

manufacturer and be the same size as the original

media provided with the unit.

Electric Heater Application/Operation

Factory installed electric heaters can be provided for preheat and/or post-heat. An electric preheater warms

the outdoor air prior to the energy recovery wheel to prevent frosting on the wheel. An electric post-heater

warms the air leaving the energy recovery wheel to a user specified discharge temperature. Electric heaters are

available in 208, 230, or 460 Vac (refer to heater nameplate for voltage).

Preheaters: Preheaters are standard as 2-stage, step control. Step control heaters are designed with

multiple stages made up of equal increments of heating capability. For example, a 10 kW

heater with two stages will be composed of two 5-kW stages. Preheaters are single point

wired at the factory. A temperature sensor (with field adjustable set point) is mounted in the

outdoor airstream after the preheater to turn the preheater on. See Frost Control Application

/Operation for typical set points. If the temperature falls below the set point, the first stage of

the preheater will turn on. If the first stage does not satisfy the set point, the second stage will

also turn on.

Post-heaters: Post-heaters are standard as SCR control. Post-heaters are not single point wired (see

Electrical Connections). A temperature sensor (with field adjustable set point) is mounted in

the outdoor airstream after the post-heater to turn the post-heater on. A SCR heater provides

an infinitely modulating control of the heat to provide an accurate discharge temperature. A

call for heat is required.

Electric Post-Heater

Post-Heater Control Panel

The post-heater is not single point

wired to the HRE control center.

Separate power must be supplied

to the post-heater disconnect

(located in unit control center).

Access to the post-heater control

panel is through the exhaust filter

door. The indirect evaporative

cooling media must be removed

from the unit along with the exhaust

filters to access.

Electric Preheater

The preheater is single

point wired to the HRE

control center. Access to the

preheater control panel is

through the supply filter door.

OPTIONAL ACCESSORIES

Frost Control Application/Operation

Extremely cold outdoor air temperatures can cause moisture condensation and frosting on the energy recovery

wheel.Frostcontrolisanoptionalfeaturethatwillprevent/controlwheelfrosting.Threeoptionsareavailable:

1) Timed Exhaust frost control

2) Electric preheat frost control

3) Modulating wheel frost control

All of these options are provided with a thermostat (with

probe) mounted in the outdoor air inlet compartment and

a pressure sensor to monitor pressure drop across the

wheel. The typical temperature setting corresponds to the

indoor air relative humidity as shown in the Frost Threshold Temperatures Table and represents when frost can

occur. An increase in pressure drop would indicate that frost is occurring. Both the pressure sensor AND the

outdoor air temperature sensor must trigger in order to initiate frost control. The two sensors together insure

that frost control is only initiated during a real frost condition. Field wiring of a light (or other alarm) between

6 & C in the control center will notify personnel when unit is in frost control mode (refer to Remote Panel Wiring

schematics section for wiring details). The following explains the three options in more detail.

Timed exhaust frost control includes a timer in addition to the thermostat

and pressure sensor. When timed exhaust frost control is initiated, the timer

will turn the supply blower on and off to allow the warm exhaust air to defrost

the energy recovery wheel. Default factory settings are 5 minutes off and 30

minutes on. Use the following test procedure for troubleshooting.

Testing (refer to diagram at right)

• Jumperthepressureswitch.SettheTimerScaleforT1andT2to

1 minute. Set the Timer Settings for T1 and T2 to 1.0. Set the dip

switch to the down position.

• Turnthetemperaturesensorupashighaspossible.Thesupplyblower

should cycle on for one minute, then turn off for one minute.

• Aftertesting,settheTimer Scaleasfollows:T1=10minutes,T2=

1 hour

• SettheTimer Settingsasfollows:T1=0.5,T2=0.5.Thetimerisnow

set for 5 minutes off and 30 minutes on. Remember to remove the jumper.

Electric preheat frost control includes an electric heater (outdoor air inlet) and an air pressure switch

(outdoor air outlet) in addition to the thermostat and pressure sensor on wheel. (Refer to Electric Heater

Application/Operation for electric preheater location). When electric preheat frost control is initiated, the electric

preheater will turn on and warm the air entering the energy wheel to avoid frosting. Use the following test

procedure for troubleshooting.

Testing

• Turnthethermostatashighasitwillgoandjumperthewheelpressuresensor.Theheater

should turn on.

• Ifitdoesn’t,eitherputthesupplysidedoorsonortemporarilyjumpertheairpressureswitchto

avoid nuisance tripping of the pressure switch. Remember to remove the jumpers.

Modulating wheel frost control includes a variable frequency drive in addition to the thermostat and pressure

sensor. When modulating wheel frost control is initiated, the variable frequency drive will reduce the speed

of the wheel reducing the speed of the energy wheel reduces its effectiveness, which keeps the exhaust air

condition from reaching saturation, thus, eliminating condensation and frosting. If the outdoor air temperature is

greater than the frost threshold temperature OR the pressure differential is less than the setpoint, the wheel will

runatfullspeed.IftheoutdoorairtemperatureislessthanthefrostthresholdtemperatureANDthepressure

differential is greater than the setpoint, the wheel will run at reduced speed until the pressure differential falls

below the setpoint. The temperature and pressure differential set points are set at the factory, but are field-

adjustable (refer to VFD section for more information). The variable frequency drive will be fully programmed at

the factory.

A1 B1 15

16 18 A2

0.20

0.41.0

0.60.8

0.20

0.41.0

0.60.8

T2 T21 MIN

T11 MIN

Timer

Scale

Dip

Switch

Frost Threshold Temperatures

Indoor RH @ 70º F Frost Threshold Temp

20% 2º F

25% 7º F

30% 14º F

Timer

OPTIONAL ACCESSORIES

The energy recovery wheel operation can be altered to take advantage of economizer operation (free cooling).

Twomodesareavailable:1)De-energizingthewheelor2)Modulatingthewheel.Afieldsuppliedcallforcool

(Y1) is required.

De-energizing the wheel is accomplished with a signal from a Temperature or Enthalpy sensor mounted in

the supply air inlet compartment. This Primary sensor will de-energize the energy wheel when the outdoor air

temperature (factory default is 65ºF) or enthalpy (factory default is the “D” setting) is below the field adjustable

set point. An Override temperature sensor is also furnished in the supply air inlet compartment to deactivate

economizer mode. The Override (with field adjustable set point) is set at some temperature lower than the

Primary sensor (factory default is 50ºF). Effectively, the two sensors create a deadband where the energy

recovery wheel will not operate and free cooling from outside can be brought into the building unconditioned.

Testing

Temperature Sensor with Override

• TurnbothTemperatureandOverridethermostatsdownaslowastheygo.The

wheel should be rotating.

• TurntheTemperaturesensorupashighasitgoes,andkeeptheOverridesensor

as low as it will go. The wheel should stop rotating.

• Turnbothsensorsashighastheywillgo.Thewheelshouldstartrotating.

• SettheTemperaturesensoratdesiredpointforeconomizeroperationtobegin.

Set the Override sensor at desired point for economizer operation to end (factory

default is 65ºF and 50ºF, respectively).

Enthalpy Sensor with Override

• Turnunitpoweroff.DisconnectC7400solidstateenthalpysensorfromterminal

So on the enthalpy controller. Also, disconnect the 620 ohm resistor from

terminal Sr on the enthalpy controller. Turn unit power on. The LED on the

enthalpy controller should light and the energy recovery wheel should not rotate.

• Turnunitpoweroff.Reconnect620ohmresistortoterminalSrontheenthalpy

controller. Turn unit power on. The LED on the enthalpy controller should not

light and the energy recovery wheel should energize and rotate.

If the steps above provide the results described, the enthalpy

economizer is working properly.

• Turnunitpoweroff.ReconnectC7400solidstateenthalpysensor

to terminal So.

Modulating the Wheel

In applications in which an internal heat gain is present in the space,

the rotational speed of the energy wheel may be modulated (via variable

frequency drive) to avoid overheating the space during the winter. The speed of the energy wheel will be

controlled in response to the discharge temperature setpoint.

SequenceofOperation: The variable frequency drive is fully programmed at the factory (refer to VFD section

for more information). A “call for cool” must be field wired to the unit (terminals provided in unit - refer to wiring

diagram in unit control center) to allow for initiation of economizer mode. When the space calls for cooling,

factorysuppliedcontrolswilldrivethefollowingwheeloperations:

TOA > TRA : Wheelrunsatfullspeed(maximumenergyrecovery)

TOA < TRA and TOA > TSA : Wheelisstopped(noenergyrecovery)

TOA < TRA and TOA < TSA  : Wheelwillmodulatetomaintaindischargetemperature

where (TOA) is the outdoor air temperature set point, (TRA) is the return air temperature set point, and (TSA) is

the supply air discharge thermostat setpoint (nominal 60¡F Ð not adjustable).

Economizer Application/Operation

Temperature Sensor

with Override

Enthalpy Sensor

with Override

Enthalpy

Controller

OPTIONAL ACCESSORIES

Variable Frequency Drives for Blowers

Optional factory installed, wired, and programmed variable frequency drives (VFD) may have been provided

for modulating or multi-speed control of the blowers. One VFD is provided for each blower (outdoor air and

exhaust). The VFDs provided are either Yaskawa model E7 or model GPD305. Refer to the tables on the

next page for factory settings and field wiring requirements. Refer to the unit control center for unit specific

wiring diagram (an example wiring diagram has been provided in this section for reference). When making

adjustments outside of the factory setpoints, refer to Yaskawa VFD instruction manual, which can be found

online at www.drives.com. For technical support, contact Yaskawa direct at 1-800-927-5292.

SN SC SP

E(G) S1 S2

MCMBMAA1 A2 +V AC AC R+ R-

M4S6S5S4 FMS7 AC S-IGAM S+ M3 M2M1 E(G)

DATA

ENTER

STOP

HAND

RUN

OFF

RESET

MONITOR

AUTO

ESC

YASKAWA E7

YASKAWA

GPD 305/J7

MA MB MC S1 FSS3 S4 SCS5 AMFR FC AC

STOP

RESET

DATA

ENTER

DSPL

RUN

MAXMIN

FOUT

F/R

FREF MNTR

PRGM

LO/RE

IOUT

OPTION 1 - 0-10 VDC CONTROL

FCFR

0-10 VDC CONTROL SIGNAL (BY OTHERS)

WIRED TO FR (+) AND FC (COMMON)

OPTION 2 - MULTI SPEED CONTROL

S5S4 SC

YASKAWA BLOWER VFD DETAIL WIRING

NEITHER S4 OR S5 CONTACT CLOSED

DRIVE SPEED = 60 Hz.

DRIVE SPEED = 40 Hz.

S4 TO SC CONTACT CLOSED (BY OTHERS)

S5 TO SC CONTACT CLOSED (BY OTHERS)

DRIVE SPEED = 30 Hz.

TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.

PARAMETER n01 CHANGE TO 1

PARAMETER n22 FOR NEW 40Hz SETTING

PARAMETER n21 FOR NEW 60Hz SETTING

PARAMETER n23 FOR NEW 30Hz SETTING

PARAMETER n01 CHANGE TO 0

FOR CONTINUOUS 60Hz OPERATION JUMPER TERMINALS FS AND FR.

0 VDC=30 Hz

10 VDC=60 Hz

USER TO PROVIDE CONTACTS

SEE VFD INSTALLATION MANUAL FOR MORE DETAIL

OPTION 1 - 0-10 VDC CONTROL

SEE VFD INSTALLATION MANUAL FOR MORE DETAIL

USER TO PROVIDE ISOLATION AS REQUIRED

FOR CONTINUOUS 60Hz OPERATION JUMPER TERMINALS A1 AND +V.

WIRED TO A1 (+) AND AC (COMMON)

0-10 VDC CONTROL SIGNAL (BY OTHERS)

10 VDC=60 Hz

0 VDC=30 Hz

A1 AC

SEE VFD INSTALLATION MANUAL FOR MORE DETAIL

PARAMETER A1-01 CHANGE TO 0

PARAMETER D1-03 FOR NEW 30Hz SETTING

PARAMETER D1-01 FOR NEW 60Hz SETTING

PARAMETER D1-02 FOR NEW 40Hz SETTING

PARAMETER A1-01 CHANGE TO 2

TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.

DRIVE SPEED = 30 Hz.

S6 TO SN CONTACT CLOSED (BY OTHERS)

S5 TO SN CONTACT CLOSED (BY OTHERS)

DRIVE SPEED = 40 Hz.

DRIVE SPEED = 60 Hz.

NEITHER S5 OR S6 CONTACT CLOSED

SNS5 S6

USER TO PROVIDE CONTACTS AND ISOLATION AS REQUIRED

OPTION 2 - MULTI SPEED CONTROL

AND ISOLATION AS REQUIRED

USER TO PROVIDE ISOLATION AS REQUIRED

FOR ONE 0-10 SIGNAL, WIRE TO DRIVES IN PARALLEL

Drawing No. 116329Part No. 465535

OPTIONAL ACCESSORIES

S1toSNcontactforOn/Off

A1(0-10VDC)referencedtoAC(Canuse+15VDCfrom+V)

Parameter Setting

A1-01 Access Level 2

C6-02 Carrier frequency 2

d2-02 Ref Lower Limit 50%

E2-01 Motor Rated FLA Motor FLA

H3-03 Terminal A1 Bias 50%

O2-03 User Defaults 1

A1-01 Access Level 0

S1 to SC contact for On/Off

FR(0-10VDC)referencedtoFC(Canuse+12VDCfromFS)

Parameter Setting

n01 Access Level 1

n31 Ref Lower Limit 50%

n32 Motor Rated FLA Motor FLA

n40 Multi-Function output (MA,MB,MC) 0

n42 Analog Freq. Reference Bias 50%

n46 Carrier Frequency 2

n01 Access Level 0

Factory Setpoints - MODULATING CONTROL (0-10 VDC) FOR FAN SPEED

Yaskawa E7 Drive Yaskawa GPD-305 Drive

OPTIONAL ACCESSORIES

Variable frequency drives (VFD) for the blowers are factory setup to receive a 0-10 VDC signal wired in the field

(refer to previous page for terminal locations). Most of the setpoints in the VFDs are factory defaults. There are

a few, though, that are changed at Greenheck and are shown in the tables below. To gain access to change

setpoints on the E7 drive, parameter A1-01 needs to be set at “2”. To gain access to change setpoints on the GPD-

305 drive, parameter n01 needs to be set at “1”. To prevent access on either drive, change the parameter to “0”.

Factory Setpoints - MULTI-SPEED CONTROL (1/3 OR 1/2 SPEED REDUCTION) FOR FAN SPEED

S1toSNcontactforOn/Off

Parameter Setting

A1-01 Access Level 2

b1-01 (Frequency) Reference Source 0

C6-02 Carrier frequency 2

d1-01 Frequency Reference 1 60

d1-02 Frequency Reference 2 40

d1-03 Frequency Reference 3 30

d1-04 Frequency Reference 4 60

E2-01 Motor Rated FLA Motor FLA

O2-03 User Defaults 1

A1-01 Access Level 0

Yaskawa E7 Drive

S1 to SC contact for On/Off

Parameter Setting

n01 Access Level 1

n03 Reference Selection 1

n21 Frequency Reference 1 60Hz

n22 Frequency Reference 2 40Hz

n23 Frequency Reference 3 30Hz

n24 Frequency Reference 4 60Hz

n32 Motor Rated FLA Motor FLA

n38* Multi-function Input Sel 4 (Term S4) 6

n39* Multi-function Input Sel 5 (Term S5) 7

n40 Multi-Function output (MA,MB,MC) 0

n46 Carrier Frequency 2

n01 Access Level 0

*Parameter n39 must be set to 7 before n38 can be set to 6 (the

drive does not allow these parameters to be the same number, n39

default is 6)

Yaskawa GPD-305 Drive

Variable Frequency Drives for

Energy Recovery Wheel

Factory installed VFD for the energy recovery wheel are programmed at the factory per the settings shown

below. Refer to the instruction manual that ships with the unit when making adjustments. A copy of the manual

can be found online at www.drives.com. For technical support, contact Yaskawa direct at 1-800-927-5292.

Parameter Setting

n01 Access Level 1

n30 Ref Upper Limit 100% or 66%*

n32 Motor Rated FLA Motor FLA

n33 Elect Thermal Overload 1

n36 Multi-Function input (terminal S2) 10

n40 Multi-Function output (MA,MB,MC) 4

n41 Analog Freq. Reference Gain 0

n42 Analog Freq. Reference Bias 99

n46 Carrier Frequency 2

n58 Frequency Detection Level 20

n01 Access Level 0

Yaskawa GPD-305 Drive

*36 inch wheel is 66% (40Hz). All other wheels are 100% (60Hz).

FACTORY SUPPLIED AND WIRED

MULTI-VOLTAGE PRIMARY

24 SECONDARY

TR1

FU5

TO UNIT

MAIN POWER

DS1

SUPPLY DAMPER

ENERGY WHEEL

TR1

2-10V

SR+

RETURN AIR SENSOR

MIXED AIR

SENSOR

620 OHM RESISTOR OR

OUTDOOR AIR

SENSOR

SO+

VFD-W

PS1

NO CCOM NO

TS1

FROST CONTROL

ENERGY WHEEL

LEGEND

CC COMPRESSOR CONTACTOR

CF CONDENSING FAN CONTACTOR

CH COMPRESSOR SUMP HEATER

D DAMPER

DB POWER DISTRIBUTION BLOCK

DL DAMPER LIMIT SWITCH

DS DISCONNECT SWITCH

EC ECONOMIZER CONTROLLER

FCS CONDENSOR FAN CYCLE SWITCH

FU FUSES

FU5 CONTROL TRANSFORMER FUSES (NOT ON CLASS II)

FZ1 FREEZE PROTECTION

HPS HIGH PRESSURE SWITCH (MANUAL RESET)

LPS LOW PRESSURE SWITCH

PS1 WHEEL FROST PRESSURE SWITCH

PS2 SUPPLY DIRTY FILTER PRESSURE SWITCH

PS3 EXHAUST DIRTY FILTER PRESSURE SWITCH

R1 ENERGY WHEEL RELAY/CONTACTOR

R2 OCCUPIED/UNOCCUPIED RELAY

R3 EXHAUST BLOWER VFD RELAY

R4 SUPPLY BLOWER VFD RELAY

R5 MODULATING WHEEL FROST CONTROL RELAY

R6 ECONOMIZER RELAY

R7 COMPRESSOR INTERLOCK RELAY

R8 EVAP RELAY (INDIRECT)

R9 EVAP RELAY (DIRECT)

R10 UNIT RELAY

S1 FAN SWITCH

S2 ROTATION SENSOR REED SWITCH

S3 ROTATION SENSOR REED SWITCH

S4 CALL FOR HEAT SWITCH

S5 BYPASS SWITCH

S6 CALL FOR COOL SWITCH (FIRST STAGE)

S7 CALL FOR COOL SWITCH (SECOND STAGE)

ST MOTOR STARTER

T1 FROST CONTROL TIMER

TYPICAL SETTINGS t1(OFF) = 5 MIN., t2(ON) = 30 MIN.

T2 ROTATION SENSOR TIMER

T3 ROTATION SENSOR TIMER

T4 ECONOMIZER WHEEL JOG TIMER

TYPICAL SETTINGS t1(OFF) = 3 HRS., t2(ON) = 10 SEC.

T5 EVAP DELAY OFF TIMER

T6 COMPRESSOR MINIMUM OFF TIMER (TYP. 3 MIN.)

T7 COMPRESSOR MINIMUM OFF TIMER (TYP. 3 MIN.)

TR TRANSFORMER

TS1 FROST CONTROL THERMOSTAT (JUMPER - HEAT )

CLOSES ON TEMP. DECREASE TYPICAL SETTING 5º F.

TS2 ECONOMIZER LOW LIMIT THERMOSTAT (JUMPER - HEAT )

OPENS ON TEMP. DECREASE TYP. SETTING 20º OFFSET OR 50ºF.

TS3 ECONOMIZER UPPER LIMIT THERMOSTAT (JUMPER - HEAT)

CLOSES ON TEMP. DECREASE TYP. SETTING 65º F. /2º DIFF.

TS4 ROOM OVERRIDE SENSOR

TS5 INLET AIR POST HEATER LOCKOUT THERMOSTAT (AFTER WHEEL)

CLOSES ON TEMP. DECREASE TYPICAL SETTING 65º F.

TS6 INLET AIR COMPRESSOR LOCKOUT THERMOSTAT (JUMPER-HEAT)

OPENS ON TEMP. DECREASE TYPICAL SETTING 60º F./2º DIFF.

A2 A1

o FIELD WIRED

FIELD CONTROL WIRING RESISTANCE SHOULD NOT EXCEED 0.75 OHM. IF

RESISTANCE EXCEEDS 0.75 OHM THEN CONSULT FA CTORY. USE 14 GAUGE

MINIMUM WIRE THICKNESS FOR CONTROL WIRING.

REPLACEMENT FUSES: MUST HAVE A MINIMUM I.R. RATING OF 5 KA

CAUTION:

UNIT SHALL BE GROUND IN ACCORDANCE WITH N.E.C.

POWER MUST BE OFF WHILE SERVICING.

USER INTERFACE CONNECTIONS:

D1 EXHAUST DAMPER

GROUND

FR FC

FROST CONTROL INDICATOR

12 C

ROTATION INDICATOR

DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.

SUPPLY DIRTY

FILTER SWITCH

EXHAUST DIRTY

FILTER SWITCH

DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.

USER INTERFACE CONNECTIONS:USER INTERFACE CONNECTIONS:USER INTERFACE CONNECTIONS:

USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.

USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.

TO FR AND FC

ON VFD-W

SEE BELOW FOR

TERMINAL CONNECTIONS

NC NO

NC CNO

ECONOMIZER CONTROL

MOTOR

EXHAUST FAN

SUPPLY FAN

0-10 VDC

VFD-S

S1 FR

VFD-E

VFD-E O.L.

MB MC

EXHAUST FAN

VFD-S O.L.

MB MC

SUPPLY FAN

S2 1

ROTATION SENSOR

MA ON VFD-W

TO MA AND MC

THERMOSTAT(S) TS1,

24 VACTHERMOSTAT CONTROLLER(S)

OA-SENSOR

SENSOR COM

PS2

PS3

Following is an example of a typical wiring diagram located in the unit control center. This wiring diagram

includes a legend highlighting which accessories were provided with the unit. Factory wiring and field wiring

are also indicated. This particular example includes 1) variable frequency drives on the blowers requiring a

modulating input, 2) modulating energy recovery wheel with factory controls for economizer, 3) energy recovery

wheel rotation sensor, 4) outdoor air and exhaust air dirty filter switches, 5) motorized outdoor air and exhaust

air intake dampers, and 6) timed exhaust frost control. Many other factory installed and wired accessories are

available.

Wiring Diagram

OPTIONAL ACCESSORIES

Rotation Sensor

Dirty Filter Sensor

The rotation sensor monitors energy recovery wheel rotation. If the wheel should stop rotating, the sensor will

close a set of contacts in the unit control center. Field wiring of a light (or other alarm) between terminals R

& 12 in the unit control center will notify maintenance personnel when a failure has occurred (refer to Remote

Panel Wiring Schematics section for wiring details).

Dirty filter sensors monitor pressure drop across the outdoor air filters, exhaust air filters, or both. If the

pressure drop across the filters exceeds the set point, the sensor will close a set of contacts in the unit control

center. Field wiring of a light (or other alarm) to these contacts will notify maintenance personnel when filters

need to be replaced.

The switch has not been set at the factory due to external system losses that will affect the switch. This switch

will need minor field adjustments after the unit has been installed with all ductwork complete. The dirty filter

switch is mounted in the exhaust inlet compartment next to the unit control center or in unit control center.

To adjust the switch, the unit must be running

with all of the access doors in place, except for

the compartment where the switch is located

(exhaust inlet compartment). Model ERV units

require the opening around the control center

to be covered (with cardboard, plywood, etc.)

to set up dirty filter switch. The adjusting

screw is located on the top of the switch.

Open the filter compartment and place a

sheet of plastic or cardboard over 50% of the

filter media. Replace the filter compartment

door. Check to see if there is power at the alert

signal leads (refer to electrical diagram). If there

is no power, turn the adjustment screw on

the dirty filter gauge clockwise until you have

power. Open the filter compartment and remove

the obstructing material. Replace the door and check to make sure that you do not have power at the alert

signal leads. The unit is now ready for operation.

OPTIONAL ACCESSORIES

Setscrew (on front of switch) must be manually

adjusted after the system is in operation.

Positive pressure connection is toward the

“front or top” of the switch (senses air inlet

side of filters)

Negativepressureconnectionistowardthe“backorbottom”

of the switch (senses blower side of filters)

Vapor Tight Lights

Vapor tight lights provide light to each of the compartments

in the energy recovery unit. The lights are wired to a switch

mounted on the outside of the unit. The switch requires

a separate power source to allow for power to the lights

when the unit main disconnect is off for servicing.

OPTIONAL ACCESSORIES

Service Outlet

120 VAC GFCI service outlet ships loose for field

installation. Requires separate power source so power

is available when unit main disconnect is turned off for

servicing.

CO2 Sensor

This accessory is often used to provide a modulating control signal to a variable frequency drive to raise and

lower airflow in relationship to the CO2 levels in the space. This strategy is often referred to as Demand Control

Ventilation and provides further energy savings to the system. Follow instructions supplied with sensor for

installation and wiring details.

OPTIONAL ACCESSORIES

The remote panel is a series of junction boxes ganged

together and includes a stainless steel face plate. The

remote panel is available with a number of different alarm

lights and switches to control the unit. The remote panel

ships loose and requires mounting and wiring in the field.

Theremotepanelisavailablewiththefollowingoptions:

 • Uniton/offswitch

 • Uniton/offlight

 • 7-daytimeclock

 • Hand/off/autoswitch

 • Timedelayoverride

 • Exhaustairdirtyfilterlight

 • Outdoorairdirtyfilterlight

 • Economizerlight

 • Frostcontrollight

 • Wheelrotationsensorlight

Refer to Electrical Connections section for Field Control Wiring recommendations.

Remote Control Panel and Wiring Schematics

7-Day Timer or On/Off Switch

Timer

Override S1 - Unit On/Off

7-Day Timer

Terminal Block

Unit Control

Center

For 7-Day Timer, use blue and black wires.

Red wires should be capped off.

Hand/Off/Auto Switch

Terminal Block

Unit Control

Center

Hand/Off/Auto Switch allows the unit to

“Off” - off

“On” - Manual Operation

“Auto” - Unit is controlled by BMS, RTU, etc.

NOTE:RTUcontrollersarebyothers.

Off BMS

Auto

NC C

Indicator Lights

Unit On/Off

Frost Control

Economizer

Rotation Sensor

Supply Dirty Filter

Exhaust Dirty Filter

PS2

PS3

Dirty Filter Indicator

(Power by Others)

Supply Dirty Filter

Exhaust Dirty Filter

PS2

PS3

Hot

Refer to Pressure Switch for voltage and load ratings.

OPTIONAL ACCESSORIES

Remote Panel Wiring Schematics

A3A3

Heating/Cooling Switches and Night Setback

Switch/Timer

Unit On/Off

Heat

Econ/First Stage Cooling

Second Stage Cooling

NightSetbackSwitch

Terminal Block in

Unit Control

Center

NightSetbackTimer

OPTIONAL ACCESSORIES

Remote Panel Wiring Schematics

OPTIONAL ACCESSORIES

RAI

RAF-P

FILTER

OAAW

COOL

COIL

ACC

HEAT

COIL

OAF-A

OAD

SUPPLY

BLOWER

TO INSIDE

FROM INSIDE

EW-P

OAW-P

ENERGY WHEEL

EAWEF-A

OAI

FILTER

OAF-P

OUTSIDE

FROM

OUSTIDE

EXHAUST

BLOWER

Sensors Mounted by Factory

Factory mounted temperature, pressure, and current sensors are available in the locations indicated on the unit

diagram below. A list of available sensors is shown below. The specific sensors provided on a given unit are

labeled in the unit control center on the terminal strip. Sensors are wired to the terminal strip to make it easy for

the controls contractor to connect the Building Management System for monitoring purposes.

Pressure Sensors (analog or digital)

Drawing Labels Terminal Strip Labels

OAF-P OA/Supply Filter Pressure

OAW-P Outdoor Air Wheel Pressure

RAF-P RA/Exhaust Filter Pressure

EW-P Exhaust Wheel Pressure

Amp - Current Sensors (analog or digital)

Drawing Labels Terminal Strip Labels

OAF-P Supply Fan Amps

EF-A Exhaust Fan Amps

Temperature Sensors - 1K Ohm RTD

Drawing Labels Terminal Strip Labels

OAI OA/Supply Inlet Temp

OAAW OA After

ACC After Cooling Coil Temp

OAD Supply Discharge Temp

EAW Exhaust After Wheel Temp

RAI RA/Exhaust Inlet Temp

START-UP CHECKLIST FOR UNIT

UnitModelNumber ____________________________ (e.g. HRE-55)

 UnitSerialNumber ____________________________ (e.g. 04C99999)

Energy Wheel Date Code ____________________________ (e.g. 0450)

Start-up date ____________________________ (MM/DD/YYYY)

 Start-upPersonnelName ____________________________

Start-up Company ____________________________

 PhoneNumber ____________________________

Pre-Start Up Checklist - check boxes as items are completed

o Disconnect and lock-out all power switches

o Remove any foreign objects that are located in the energy recovery unit.

o Check all fasteners, set-screws, and locking collars on the fans, bearings, drives, motor bases and

accessories for tightness.

o Rotate the fan wheels and energy recovery wheels by hand and ensure no parts are rubbing. If rubbing

occurs, refer to Start-Up section for more information.

o Check the fan belt drives for proper alignment and tension (refer to Start-Up section for more

information).

o Filters can load up with dirt during building construction. Replace any dirty pleated filters and clean the

aluminum mesh filters in the intake hood (refer to Routine Maintenance section).

o Verify that non-motorized dampers open and close properly.

o Check the tightness of all factory wiring connections.

o Verify control wire gauge (refer to the Electrical Connections section).

o Verify diameter seal settings on the energy recovery wheel (refer to Start-Up section for more

information.

o Verify proper drain trap installation (refer to Drain Trap section).

o For plenum or BI fans, check the radial gap and overlap. Adjust if necessary.

Every installation requires a comprehensive start-up to ensure proper operation of the unit. As part of

that process, the following checklist must be completed and information recorded. Starting up the unit in

accordance with this checklist will not only ensure proper operation, but will also provide valuable information

to personnel performing future maintenance. Should an issue arise which requires factory assistance, this

completed document will allow unit experts to provide quicker resolve. Qualified personnel should perform

start-up to ensure safe and proper practices are followed.

SAFETY CAUTION!

Use caution when removing access panels or other

unit components, especially while standing on a

ladder or other potentially unsteady base. Access

panels and unit components can be heavy and

serious injury may occur.

SAFETY CAUTION!

Do not operate energy recovery ventilator without

the filters and birdscreens installed. They prevent the

entry of foreign objects such as leaves, birds, etc.

SAFETY DANGER!

Electric shock hazard. Can cause injury or death.

Before attempting to perform any service or

maintenance, turn the electrical power to unit to OFF

at disconnect switch(es). Unit may have multiple

power supplies.

CAUTION!

Do not run unit during construction phase. Damage

to internal components may result and void warranty.

Line Voltage - check at unit disconnect

L1-L2 ________ Volts L2-L3 ________ Volts L1-L3 _______ Volts

MotorAmpDraw:

Supply Motor Amps L1 ________ Amps L2 ________ Amps L3 ________ Amps

Exhaust Motor Amps L1 ________ Amps L2 ________ Amps L3 ________ Amps

FanRPM: SupplyFanRPM _____________

Exhaust Fan RPM _____________

Correctfanrotationdirection: SupplyFan Yes/No

 ExhaustFan Yes/No

Start-Up Checklist

The unit will be in operational mode during start-up. Use necessary precautions to avoid injury. All data must

be collected while the unit is running. In order to measure volts & amps, the control center door must be open,

and the unit energized using a crescent wrench to turn the disconnect handle.

Special Tools Required

Voltage Meter (with wire probes)

Amperage Meter

Incline manometer or equivalent

Tachometer

Thermometer

START-UP CHECKLIST FOR UNIT

START-UP CHECKLIST FOR EVAPORATIVE COOLER

Evaporative coolers are an integral part of the unit and must be set up properly. Doing so will ensure correct

operation and avoid water or leakage problems. HRE units will have one or two evaporative coolers. The

following checklist must be completed for each evaporative cooler. Qualified personnel should perform

installation and be present for start-up to ensure safe and proper practices are followed. Please refer to the

Evaporative Cooling Modules section for detailed information on start-up items below.

Indirect Evap Direct Evap

Connect overflow line (run bleed line into overflow) o o

Connect drain line o o

Install trap o o

Connect water supply line o o

For units with Auto Drain & Fill with Freeze Protection

Install, wire, and provide power to components o o

Confirm temperature and timer settings o o

Pump filter clean and installed properly o o

Saturate media per IOM o o

Adjust bleed-off rate per IOM o o

Check for water carryover o o

Connect ‘Call for Cooling’ signal o o

Remove jumper wire o o

Refer to the respective sections in this Installation, Operation and Maintenance Manual for detailed information.

Refer to wiring diagram in unit control center to determine what electrical accessories were provided.

Provided with Unit? Frost Control Application / Operation section: Setting Factory Default

Yes No Frost Control Setpoint 5ºF

Differential 2ºF

Timer Refer to IOM

Yes No Frost Control Modulating Refer to IOM

Economizer Application / Operation section:

Yes No Economizer (temperature)

Setpoint 65ºF

Offset 20ºF

Differential 2ºF

Yes No Economizer (enthalpy)

Setpoint B

Yes No Economizer (modulating) Refer to IOM

Optional Accessories section: Operational

Yes No Wheel Rotation Sensor YesNoN/A

Yes No OA Dirty Filter Sensor YesNoN/A

Yes No EA Dirty Filter Sensor YesNoN/A

Yes No CO2 Sensor YesNoN/A

Yes No Service Outlet YesNoN/A

Yes No Vapor Tight Lights YesNoN/A

Yes No Remote Control Panel YesNoN/A

Variable Frequency Drives section: Operational

Yes No Blower VFDs YesNoN/A

Yes No Wheel VFD YesNoN/A

Damper section: Operational

Yes No Outdoor Air Damper YesNoN/A

Yes No Exhaust Air Damper YesNoN/A

Yes No NightSetbackDamper YesNoN/A

Yes No Indirect Gas Furnace (refer to the PVF IOM, Part #461006 for start-up information)

Standard Indirect Evaporative Cooler Section (refer to Evap Start-Up checklist on following page)

Yes No Direct Evaporative Cooler Section (refer to Evap Start-Up checklist on following page)

OPTIONAL ACCESSORIES CHECKLIST

Fans (Forward Curved Type)

The HRE Models contain a forward curved supply fan and

a forward curved exhaust fan. These forward curved fans

should be checked for free rotation. If any binding occurs,

check for concealed damage and foreign objects in the fan

housing. Be sure to check the belt drives per the start-up

recommendations in the following section.

Fan Performance Modifications

Due to job specification revisions, it may be necessary to

adjust or change the sheave or pulley to obtain the desired

airflow at the time of installation. Start-up technician must

check blower amperage to ensure that the amperage listed

on the motor nameplate is not exceeded. Amperage to be

tested with access doors closed and ductwork installed.

SAFETY CAUTION!

When operating conditions of the fan are to be

changed (speed, pressure, temperature, etc.),

consult Greenheck to determine if the unit can

operate safely at the new conditions.

UNIT START-UP

Refer to Parts List section for component locations.

Belt Span

Deflection = Belt Span

WRONG WRONG

WRONG CORRECT

Belt Span

Deflection = Belt Span

WRONG WRONG

WRONG CORRECT

Belt Drive Installation

1. Remove the protective coating from the end of the fan shaft and

assure that it is free of nicks and burrs.

2. Check fan and motor shafts for parallel and angular alignment.

3. Slide sheaves on shafts - do not drive sheaves on as this may result

in bearing damage.

4. Align fan and motor sheaves with a straight-edge or string and

tighten.

5. Place belts over sheaves. Do not pry or force belts, as this could

result in damage to the cords in the belts.

6. With the fan off, adjust the belt tension by moving the motor base. (See

belt tensioning procedures in the Routine Maintenance section of this

manual). When in operation, the tight side of the belts should be in a

straight line from sheave to sheave with a slight bow on the slack side.

FAN MOTOR FAN

MOTOR

Proper alignment of motor and drive shaft.

Fan Belt Drives

The fan belt drive components, when supplied by Greenheck, have been carefully selected for the unit’s

specificoperatingcondition.Caution:utilizingdifferentcomponentsthanthosesuppliedcouldresultinunsafe

operatingconditionswhichmaycausepersonalinjuryorfailureofthefollowingcomponents:1)FanShaft,2)

Fan Wheel, 3) Bearings, 4) Belt, 5) Motor. Tighten all fasteners and set screws securely and realign drive pulleys

after adjustment. Check pulleys and belts for proper alignment to avoid unnecessary belt wear, noise, vibration

and power loss. Motor and drive shafts must be parallel and pulleys in line (see below).

Vibration

Excessive vibration may be experienced during initial start-up. Left unchecked, excessive vibration can cause

a multitude of problems, including structural and/or component failure. The most common sources of vibration

are listed below.

Many of these conditions can be discovered by careful observation. Refer

to the Troubleshooting section of this manual for corrective actions. If

observation cannot locate the source of vibration, a qualified technician using

vibration analysis equipment should be consulted. If the problem is wheel

unbalance, in-place balancing can be done.

Generally, fan vibration and noise is transmitted to other parts of the building

by the ductwork. To eliminate this undesirable effect, the use of heavy canvas

connectors is recommended.

1. Wheel Unbalance

2. Drive Pulley Misalignment

3. Incorrect Belt Tension

4. Bearing Misalignment

5. Mechanical Looseness

6. Faulty Belts

7. Drive Component Unbalance

8. Poor Inlet/Outlet Conditions

9. Foundation Stiffness

UNIT START-UP

Backward Inclined

Forward Curved

Airflow

Rotation Direction

Backward Inclined

Forward Curved

Airflow

Direction of Fan Wheel Rotation

Blower access is labeled on unit. Check for proper wheel rotation by momentarily

energizing the fan. Rotation is determined by viewing the wheel from the drive

side and should match the rotation decal affixed to the fan housing (see Rotation

Direction figures). If the wheel is rotating the wrong way, direction can be reversed

by interchanging any two of the three electrical leads. Check for unusual noise,

vibration, or overheating of bearings. Refer to the Troubleshooting section of this

manual if a problem develops.

Fan RPM

Supply fan and exhaust fan will have an adjustable motor pulley (on 15 HP and

below) preset at the factory to the customer specified RPM. Fan speed can be

increased or decreased by adjusting the pitch diameter of the motor pulley. Multi-

groove variable pitch pulleys must be adjusted an equal number of turns open or

closed. Any increase in fan speed represents a substantial increase in load on the

motor. Always check the motor amperage reading and compare it to the amperage

rating shown on the motor nameplate when changing fan RPM. All access doors

must be installed except the control center door. Do not operate units with access

doors open or without proper ductwork in place as the fan motors will overload.

UNIT START-UP

Energy Recovery Wheel

The HRE models contain a sensible energy recovery wheel. The

wheels are inspected for proper mechanical operation at the

factory. However, during shipping and handling, shifting can occur

that may affect wheel operation. The wheel is accessible through

the access door marked “Energy Wheel Cassette Access”. For

theHRE-20ANDHRE-45models,thewheelcassetteslidesout.

DuetothesizeandweightoftheHRE-55ANDHRE-90wheels,

they remain stationary and all maintenance is performed in place.

There is room inside the unit to perform energy recovery wheel

servicing.

Turn the energy recovery wheels by hand to verify free operation.

The wheel should rotate smoothly and should not wobble.

Drive Belt

Inspect the drive belt. Make sure the belt rides smoothly through the pulley and over the wheel rim.

Air Seals

Air seals are located around the perimeter of the

wheel and across the face of the wheel (both sides

of wheel). Check that these seals are secure and in

good condition.

Check that the air seals located around the outside

of the wheel and across the center (both sides of

wheel) are secure and in good condition. Air seal

clearance is determined by placing a sheet of

paper, to act as a feeler gauge, against the wheel

face. To access seals, enter unit for HRE-55 &

HRE-90, or pull out the cassette for HRE-20 & HRE-

45, following the instructions in Energy Recovery

Wheel Maintenance section. To adjust the air seals,

loosen all eight seal retaining screws. These screws

are located on the bearing support that spans the

length of the cassette through the wheel center.

Tighten the screws so the air seals tug slightly on the sheet of paper.

Replace cassette into unit, plug in wheel drive, replace access door and apply power. Observe by opening door

slightly (remove filters if necessary to view wheel) that the wheel rotates freely at about 35 RPM.

Drive Belt

Drive Pulley

Adjustable

Air Seals

Label showing

cassette serial #

and date code

Bearing Support

Inside layout of HRE unit

Once the unit has been put into operation, a routine maintenance program should be set up to preserve

reliabilityandperformance.Itemstobeincludedinthisprogramare:

SAFETY CAUTION!

Use caution when removing access panels or other

unit components, especially while standing on a

ladder or other potentially unsteady base. Access

panels and unit components can be heavy and

serious injury may occur.

SAFETY DANGER!

Electric shock hazard. Can cause injury or death.

Before attempting to perform any service or

maintenance, turn the electrical power to unit to OFF

at disconnect switch(es). Unit may have multiple

power supplies.

ROUTINE MAINTENANCE

DATE DATE DATE DATE

______ ______ ______ _____

Lubrication

Apply lubrication where required oooo

Dampers

Check for unobstructed operation ooo o

Fan Belts

Check for wear, tension, alignment ooo o

Motors

Check for cleanliness ooo o

Blower Wheel & Fasteners

Check for cleanliness ooo o

Check all fasteners for tightness ooo o

Check for fatigue, corrosion, wear ooo o

Bearings

Check for cleanliness oooo

Check set screws for tightness oooo

Lubricate as required ooo o

External Filter

Check for cleanliness - clean if required ooo o

Internal Filter

Check for cleanliness - replace if required ooo o

Door Seal

Check if intact and pliable ooo o

Coil Maintenance

Check for cleanliness (coil and drain pan) ooo o

Winterizing Coils

Drain - Fill with antifreeze - Drain ooo o

Energy Recovery Wheel

Check for cleanliness - clean if required ooo o

Check belt for wear ooo o

Check pulley, bearings, and motor ooo o

Evap Cooler Section

Refer to Evaporative Cooler Maintenance section ooo o

ROUTINE MAINTENANCE

Proper fan belt settings

Belt Span

Deflection = Belt Span

The proper belt setting is the lowest tension

at which the belts will not slip under peak load

operation. For initial tensioning, set the belt

deflection at 1/64-inch for each inch of belt span

(measured half-way between sheave centers).

For example, if the belt span is 64 inches, the

belt deflection should be 1 inch (using moderate

thumb pressure at mid-point of the drive). Check

belt tension two times during the first 24 hours of

operation and periodically thereafter.

Fan Belts

Belts must be checked on a regular basis for wear, tension, alignment, and dirt accumulation. Premature

or frequent belt failures can be caused by improper belt tension (either too loose or too tight) or misaligned

sheaves. Abnormally high belt tension or drive misalignment will cause excessive bearing loads and may result

in failure of the fan and/or motor bearings. Conversely, loose belts will cause squealing on start-up, excessive

belt flutter, slippage, and overheated sheaves. Both loose and tight belts can cause fan vibration.

When replacing belts on multiple groove drives, all belts should be changed to provide uniform drive loading.

Do not pry belts on or off the sheave. Loosen belt tension until belts can be removed by simply lifting the

belts off the sheaves. After replacing belts, insure that slack in each belt is on the same side of the drive. Belt

dressing should never be used.

Do not install new belts on worn sheaves. If the sheaves have grooves worn in them, they must be replaced

before new belts are installed.

Lubrication

Check all moving components for proper lubrication. Apply lubrication where required. Any components

showing excessive wear should be replaced to maintain the integrity of the unit and ensure proper operation.

Dampers

Check all dampers to ensure they open and close properly and without binding. Backdraft dampers can be

checked by hand to determine if blades open and close freely. Apply power to motorized dampers to ensure

the actuator opens and closes the damper as designed.

Fan Motors

Motor maintenance is generally limited to cleaning and lubrication. Cleaning

should be limited to exterior surfaces only. Removing dust and grease buildup

onthemotorhousingassistspropermotorcooling.Neverwash-downmotor

with high pressure spray. Greasing of motors is only intended when fittings are

provided. Many fractional motors are permanently lubricated for life and require

no further lubrication.

Fan Wheel & Fasteners

Wheels require very little attention when moving clean air. Occasionally oil and

dust may accumulate on the wheel causing imbalance. When this occurs the

wheel and housing should be cleaned to assure smooth and safe operation.

Inspect fan impeller and housing for fatigue, corrosion or wear.

Routinely check all fasteners, set screws and locking collars on the fan, bearings, drive, motor base and

accessories for tightness. A proper maintenance program will help preserve the performance and reliability

designed into the fan.

External Filter Maintenance

Aluminum mesh, 2-inch deep filters are located in the

supply weatherhood (if the weatherhood option was

purchased). Filters should be checked and cleaned on

a regular basis for best efficiency. The frequency of

cleaning depends upon the cleanliness of the incoming

air. These filters should be cleaned prior to start-up.

To access these filters, remove bottom bolt in the access

door on the side of the weatherhood. Slide the access

door up and then pull bottom out to remove door. Then,

slide the filters out (see figure at right).

Clean filters by rinsing with a mild detergent in warm

water.

Internal Filter Maintenance

The HRE units will typically be provided with 2-inch,

pleated filters in the outdoor air and exhaust airstreams.

These filters should be checked per a routine

maintenance schedule and replaced as necessary to

ensure proper airflow through the unit. See table at

right for pleated filter size and quantity for each unit.

Replacement filters shall be of same performance and

quality as factory installed filters. Filter type must be

pleated design with integral metal grid. Two acceptable

filter replacements are Aerostar Series 400 or Farr 30/30®.

Outdoor Air Filters: Access to the outdoor air filters

is through the door labeled as “Filter Access” on the

outdoor air side of the unit.

Exhaust Air Filters: Access to the exhaust air filters

is through the door labeled as “Filter Access” on the

exhaust air side of the unit.

Refer to Access Door Descriptions section for additional

information on filter locations.

Door Seal Maintenance

Slip-on type vinyl seal is installed on the perimeter of the

door openings. Inspect at least annually to ensure that

seal is still pliable and intact.

Outdoor air intake hood

mesh filter access

ROUTINE MAINTENANCE

Filter Size and Quantities

Model Internal

Filter Size

Quantity

Supply

Quantity

Exhaust

HRE-20 20 in. x 20 in. 2 2

HRE-45 20 in. x 25 in. 3 3

HRE-55 16 in. x 25 in. 6 6

HRE-90 20 in. x 20 in. 8 8

Bearings

Mostbearingsarepermanentlylubricatedandrequirenotfurtherlubricationundernormaluse.Normaluse

being considered -20ºF to 120ºF and in a relatively clean environment. Some bearings are re-lubricatable and

will need to be regreased depending on fan use. Check your bearings for grease zert to find out what type of

bearing you have. If your fan is not being operated under normal use, bearings should be checked monthly for

lubrication.

Access to wheel through

outdoor air filter door

The HRE units have one energy recovery wheel. Open the outdoor

air filter door to access the wheel. For the HRE-20 and HRE-45

models, the wheel cassette slides out. Due to the size and weight

of the HRE-55 and HRE-90 wheels, they remain stationary and all

maintenance is performed in place. There is room inside the unit to

perform energy recovery wheel servicing. Filters must be removed to

access stationary wheels.

**WARNING: Disconnect power to the unit before performing

any type of service.

ACCESSING ENERGY RECOVERY WHEEL

Energy Recovery Wheel Maintenance

Annual inspection of the energy recovery wheel is recommended. Units

ventilating smoking lounges and other non-clean air spaces should

have energy recovery wheel inspections more often based upon need.

Inspections for smoke ventilation applications are recommended

bimonthly to quarterly until a regular schedule can be established.

ROUTINE MAINTENANCE

IMPORTANT! PLACE RETAINERS BACK IN THE

ORIGINAL POSITION BEFORE

ROTATING THE ENERGY RECOVERY WHEEL.

OTHERWISE DAMAGE TO RETAINER WILL

OCCUR.

Bracket Segment Retainer

Lift Away

From Segment

Catch-

Segment Retainer

Push Toward Center

Center of Wheel

Spoke

Inside of Wheel Rim

Models HRE-20, 45, 55, & 90

Steel retainers are located on the

inside of the wheel rim (see diagram

at right). Push the retainer toward

center of wheel, then lift up and

away to release segments (see

below).

REMOVING THE ENERGY RECOVERY WHEEL SEGMENTS

Wheel segment removed

CLEANING THE ENERGY RECOVERY WHEEL

If the wheel appears excessively dirty, it should be cleaned to ensure maximum operating efficiency. Only

excessive buildup of foreign material needs to be removed. DISCOLORATION AND STAINING OF ENERGY

RECOVERY WHEEL DOES NOT AFFECT ITS PERFORMANCE.

Thoroughly spray wheel matrix with household cleaner such as Fantastic® or equivalent. Gently rinse with

warm water and using a soft brush remove any heavier accumulation. A detergent/water solution can also be

used. Avoid aggressive organic solvents, such as acetone. The energy recovery wheel segments can be soaked

in the above solution overnight for stubborn dirt or accumulation.

After cleaning is complete, shake the excess water from the wheel or segments. Dry wheel or segments

before placing them back into the cassette. Place wheel or segments back into cassette by reversing removal

procedures.

** DO NOT CLEAN ENERGY RECOVERY WHEEL SEGMENTS WITH WATER IN EXCESS OF 140ºF

** DO NOT DRY ENERGY RECOVERY WHEEL SEGMENTS IN AIR IN EXCESS OF 140ºF.

** THE USE OF A PRESSURE WASHER TO CLEAN SEGMENTS IS NOT RECOMMENDED. DAMAGE COULD

RESULT.

Energy Recovery Wheel Belt

Energy Recovery Wheel Bearings

Inspect belts each time filters are replaced. Belts that

look chewed up or are leaving belt dust near the motor

pulley may indicate a problem with the wheel. Be sure to

inspect wheel for smooth and unrestricted rotation. If a

belt requires replacement, contact the local Greenheck

representative. Instructions for replacement will ship with

the new belt.

Wheel Belt & Pulley

In the unlikely event that a wheel bearing fails, access is

available through the outdoor air filter door and through

a removable plate in the divider in the unit (accessed

through the exhaust air filter door). Contact the local

Greenheck representative for detailed instructions on how

to replace the bearing.

ROUTINE MAINTENANCE

Wheel Bearing

PARTS LIST

Model HRE

(shown with indirect evaporative

cooler, optional direct evaporative

cooler, and indirect gas heater)

1. Supply blower

- Forward curved fan

- Adjustable motor mount for belt tensioning

- Adjustable sheaves for speed control

2. Vibrations isolators (quantity 4 per blower)

  -Neoprene

3. Energy recovery wheel cassette

4. Removable energy recovery wheel segments

5. Optional supply weatherhood with 2 in. aluminum

mesh filter

6. Optional exhaust weatherhood with birdscreen

7. Optional supply and exhaust air filter racks for

2 in. pleated, 30% efficient filters

8. Electrical control box (standard features)

- Single point power

- Disconnect interlocked with access door

- Motor starters for the supply blower, exhaust

blower and energy wheel motors

- 24 Vac, control circuit with terminal strip

9. Supply air tempering options

- Electric heat (requires separate power)

- Hot water heat

- Indirect gas heat

10. Exhaust blower

- Forward curved fan

- Adjustable motor mount for belt tensioning

- Adjustable sheaves for speed control

11. Indirect evaporative cooler

12. Direct evaporative cooler

The HRE units are pre-wired such that when a call for outside air is made (via field supplied 24 VAC control

signal wired to unit control center), the supply fan, exhaust fan and energy wheel are energized and the

motorized dampers open. The HRE units can be supplied with or without heating and cooling coils. For units

with coils, controls can be supplied by Greenheck or by the controls contractor. If supplied by the controls

contractor, they would provide, mount, and wire any temperature controllers and temperature or relative

humidity sensors required for the unit to discharge air at the desired conditions.

Basic Unit

A sensible wheel preconditions the outdoor air (temperature is decreased) by the transfer of energy from the

cool exhaust air coming out of the indirect evaporative cooler.

Units supplied with a direct evaporative cooling coil can further cool the air coming off the wheel to levels near

55ºF.

EconomizerOperation:SeeEconomizerApplication/Operationsection

Summer Operation

Outdoor air is preconditioned (temperature is increased) by the transfer of energy from the warmer exhaust air

via the sensible recovery wheel.

Units supplied with heating coils can further heat the air coming off the wheel to levels at or above room

design.

FrostControlOperation:SeeFrostControlApplication/Operationsection

Winter Operation

SEQUENCE OF OPERATION

Test and Balance Report

The test and balance report (TAB) is utilized to determine whether the appropriate amount of outdoor air

and exhaust air is being supplied and removed from a building, respectively. There are no set rules on what

information must be included in a TAB report. As such, if a TAB report indicates that the airflow on a unit is low,

priortocontactingthefactory,pleasedeterminethefollowinginformation:

Airflow problems can often be tied back to improper ductwork installation. Be sure to install ductwork in

accordancewithSMACNAandAMCAguidelines.

Unit #1 Unit #2 Unit #3 Unit #4

Model Number

Serial Number

Name Plate Information

Voltage

Hertz

Phase

Outdoor Air Fan Amps

Exhaust Fan Amps

Outdoor Air Fan Horsepower

Exhaust Fan Horsepower

Design Airflow

Outdoor Air

Exhaust

Measured Airflow

Outdoor Air

Exhaust

Measured Data

Blower Rotation

Outdoor Air Fan RPM

Exhaust Fan RPM

Outdoor Air Fan Amp Draw

Exhaust Fan Amp Draw

Pressure Drop Across Energy Recovery Wheel

Outdoor Air Side

Exhaust Side

Troubleshooting Airflow

* Always provide the unit model and serial number when requesting parts or service information. * Always check motor amps and compare to nameplate rating.

Control power (24 Vac) wiring

run is too long (resistance

should not exceed 0.75 ohms).

Shorten wiring run to mechanical room or install a relay

which will turn unit on/off (C/F for relay information).

Incoming supply power is

less than anticipated. Voltage

supplied to starter coil must

bewithin+10%/-15%of

nominal voltage stated on

the coil.

Needtoincreasesupplypoweroruseaspecialcontrol

transformer which is sized for the actual supply power.

Motor Starters

‘Chatter’

DoNotPullIn

Blown fuse or open circuit

breaker.

Replace fuse or reset circuit breaker and check amps.

Possible CauseSymptom Corrective Action

Defective motor or capacitor. Replace.

Motor starter overloaded. Reset starter and check amps.

Electrical. Check for On/Off switches. Check for correct supply voltage.

Drive. Check for broken or loose belts. Tighten loose pulleys.

Blower Fails to

Operate

Cfm too high. Check cfm and adjust drives if needed.

Static pressures are higher or

lower than design.

If higher, ductwork should be improved.

If lower, fan rpm should be lower.

Blower rotation is incorrect. Check rotation and reverse if necessary.

Motor voltage incorrect. Check motor nameplate versus supplied voltage.

Motor horsepower too low. See specifications and catalog for fan curves to determine if

horsepower is sufficient.

Motor Over Amps

Shorted windings in motor. Replace motor.

Unit damper not fully open. Adjust damper linkage or replace damper motor.

System static pressure too high Improve ductwork to eliminate losses using good duct

practices.

Blower speed too low. Check for correct drives and rpm with catalog data.

Fan wheels are operating

backwards.

For 3-phase, see Direction of Fan Wheel Rotation under Unit

Start-Up section.

Dirty filter or energy wheel. Follow cleaning procedures in Routine Maintenance section.

Leaks in ductwork. Repair.

Elbows or other obstructions

may be obstructing fan outlet.

Correct or improve ductwork.

Belt slippage. Adjust belt tension.

Blower fan speed too high. Check for correct fan rpm. Decrease fan speed if necessary.

Filter(s) not in place. Install filters.

Insufficient static pressure (Ps)

(airflow resistance).

Induce Ps into system ductwork. Make sure grilles and

access doors are installed. Decrease fan speed if necessary.

Low Airflow (cfm)

High Airflow (cfm)

Troubleshooting

*Always provide the unit model and serial number when requesting parts or service information. *Always check motor amps and compare to nameplate rating.

Energy Wheel

DoesNOTTurn

Blower fan motor overloads are

tripping and auto-resetting.

Decrease fan speed.

Possible CauseSymptom Corrective Action

Exhaust Only frost control

sensors are tripping.

Adjust frost temperature sensor set point as needed.

Air seals are too tight. See Energy Recovery Wheel under Unit Start-Up section.

‘Economizer’ sensors are

operating.

Adjust temperature or enthalpy set points as needed.

Nopowertowheelmotor. Make sure wheel drive is plugged in. Verify power is

available.

Wheel drive belt Check for loose or broken belts. Replace belts (consult

factory).

One or Both

Blowers Turn Off

Intermittently and

Back on After

About 2 Minutes

Wheel motor overloads are

tripping, due to rubbing

between wheel and air seals.

Recheck air seals, make sure they are not too tight. See

Energy Recovery Wheel under Unit Start-Up Section.

Fan wheel rubbing on inlet Adjust wheel and/or inlet cone. Tighten wheel hub or bearing

collars on shaft.

Bearings. Replace defective bearings (s). Lubricate bearings. Tighten

collars and fasteners.

Wheel out of balance. Replace or rebalance.

Loose wheel on shaft. Tighten wheel setscrew.

Energy Wheel

Runs Intermittently

Loose motor or blower sheave. Tighten sheave setscrew.

Belts too loose. Adjust belt tension after 24 hours of operation.

Belts too tight. Loosen to maintain a 3/8 inch deflection per foot of span

between sheaves.

Worn belt. Replace.

Motor base or blower loose. Tighten mounting bolts.

Build-up of material on wheel. Clean wheel and housing.

Bearing and drive misaligned. Realign.

Noisebeingtransmittedby

duct.

Make sure duct work is supported properly. Make sure duct

work metal thickness is sized for proper stiffness. Check duct

size at discharge to ensure that air velocities are not too high.

ExcessiveNoiseor

Vibration

Troubleshooting

#461248 IOM HRE FS

Rev. 4, April 2012

Warranty

Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from

the purchase date. The energy recovery wheel is warranted to be free from defects in material and workmanship for a

period of five years from the purchase date. Any units or parts which prove defective during the warranty period will be

replaced at our option when returned to our factory, transportation prepaid.

Motors are warranted by the motor manufacturer for a period of one year. Should motors furnished by Greenheck prove

defective during this period, they should be returned to the nearest authorized motor service station. Greenheck will not

be responsible for any removal or installation costs.

As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.

Greenheck Fan Heat Recovery Unit With Evaporative Cooling 45 Users Manual

HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING HRE-20 461248HRE_iom

HRE-90 461248HRE_iom_1

90 to the manual 776ffa43-544e-4e6a-976f-9ca3ac8b3c34

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