Greenheck Fan Energy Recovery Ventilator Erve Users Manual

ERVe to the manual 1d3dbe18-3c99-473e-809e-baa59432ca8f

2015-02-09

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1Model ERVe Energy Recovery Unit

Installation, Operation and Maintenance Manual

Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the

product described. Protect yourself and others by observing all safety information. Failure to comply with instructions

could result in personal injury and/or property damage! Retain instructions for future reference.

Part #473007

Energy Recovery Ventilators

Only qualified personnel should install this system.

Personnel should have a clear understanding of these

instructions and should be aware of general safety

precautions. Improper installation can result in electric

shock, possible injury due to coming in contact with

moving parts, as well as other potential hazards.

Other considerations may be required if high winds

or seismic activity are present. If more information

is needed, contact a licensed professional engineer

before moving forward.

1. Follow all local electrical and safety codes, as well

as the National Electrical Code (NEC), the National

Fire Protection Agency (NFPA), where applicable.

Follow the Canadian Electric Code (CEC) in

Canada.

2. All moving parts must be free to rotate without

striking or rubbing any stationary objects.

3. Unit must be securely and adequately grounded.

4. Do not spin fan wheel faster than maximum

cataloged fan RPM. Adjustments to fan speed

significantly effects motor load. If the fan RPM is

changed, the motor current should be checked to

make sure it is not exceeding the motor nameplate

amps.

5. Do not allow the power cable to kink or come in

contact with oil, grease, hot surfaces or chemicals.

Replace cord immediately if damaged.

6. Verify that the power source is compatible with the

equipment.

7. Never open access doors to the unit while it is

running.

General Safety Information

DANGER

Always disconnect power before working on or near

this equipment. Lock and tag the disconnect switch

or breaker to prevent accidental power up.

CAUTION

When servicing the unit, the internal components

may be hot enough to cause pain or injury. Allow

time for cooling before servicing.

CAUTION

Precaution should be taken in explosive

atmospheres.

Model ERVe

2Model ERVe Energy Recovery Unit

Machined parts coated with rust preventive should

be restored to good condition promptly if signs of

rust occur. Immediately remove the original rust

preventive coating with petroleum solvent and clean

with lint-free cloths. Polish any remaining rust from

surface with crocus cloth or fine emery paper and oil.

Do not destroy the continuity of the surfaces. Wipe

clean thoroughly with Tectyl® 506 (Ashland Inc.) or

the equivalent. For hard to reach internal surfaces or

for occasional use, consider using Tectyl® 511M Rust

Preventive or WD-40® or the equivalent.

Receiving

Upon receiving the product, check to make sure

all items are accounted for by referencing the bill

of lading to ensure all items were received. Inspect

each crate for shipping damage before accepting

delivery. Notify the carrier if any damage is noticed.

The carrier will make notification on the delivery

receipt acknowledging any damage to the product.

All damage should be noted on all the copies of

the bill of lading which is countersigned by the

delivering carrier. A Carrier Inspection Report should

be filled out by the carrier upon arrival and the Traffic

Department. If damaged upon arrival, file claim

with carrier. Any physical damage to the unit after

acceptance is not the responsibility of Greenheck Fan

Corporation.

Unpacking

Verify that all required parts and the correct quantity

of each item have been received. If any items are

missing report shortages to your local representative

to arrange for obtaining missing parts. Sometimes it

is not possible that all items for the unit be shipped

together due to availability of transportation and truck

space. Confirmation of shipment(s) must be limited to

only items on the bill of lading.

Handling

Units are to be rigged and moved by the lifting

brackets provided or by the skid when a forklift is

used. Location of brackets varies by model and size.

Handle each piece in such a manner as to keep from

scratching or chipping the coating. Damaged finish

may reduce ability of the unit to resist corrosion.

Storage

Units are protected against damage during shipment.

If the unit cannot be installed and operated

immediately, precautions need to be taken to prevent

deterioration of the unit during storage. The user

assumes responsibility of the unit and accessories

while in storage. The manufacturer will not be

responsible for damage during storage. These

suggestions are provided solely as a convenience to

the user.

Inspection and Maintenance during

Storage

While in storage, inspect units once per month. Keep

a record of inspection and maintenance performed.

If moisture or dirt accumulations are found on parts,

the source should be located and eliminated. At each

inspection, rotate all moving components by hand

ten to fifteen revolutions to distribute lubricant on

motor and bearings. If paint deterioration begins,

consideration should be given to touch-up or

repainting. Units with special coatings may require

special techniques for touch-up or repair.

Model ERVe Energy Recovery Unit

Table of Contents

Basic Operation . . . . . . . . . . . . . . 3

Installation

Supplemental Installation, Operation and

Maintenance Manuals . . . . . . . . . . . 3

Installation Concerns. . . . . . . . . . . . 3

Lifting with a Crane / Forklift. . . . . . . . . 4

Roof Curb and Rail Mounting

Recommended Roof Opening . . . . . . . . 4

Roof Curb Mounting . . . . . . . . . . . . 5

Curb Dimensions and Weights . . . . . . . . 5

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

Rail Mounting / Layout . . . . . . . . . . . 6

Service Clearances . . . . . . . . . . . . 6

Access Panel Description and Location . . . 6

Dimensional Data . . . . . . . . . . . . . 7

Electrical Information

General Electrical Information . . . . . . . . 8

Control Center Components . . . . . . . . . 9

Electric Heater Application/Operation . . . . . 9

Unit Accessories. . . . . . . . . . . . . . 10

Exhaust Air Damper Installation . . . . . . . 10

Optional Accessories

Frost Control Application/Operation . . . . . 11

Economizer Application/Operation . . . . . . 12

Variable Frequency Drives and Wiring . . . .13 -14

Typical Wiring Diagram . . . . . . . . . . . 15

Sensors and Lights . . . . . . . . . . . . 16

Remote Control Panel and Wiring . . . . . . 17

Sensors Mounted by Factory . . . . . . . . 18

Sequence of Operation

Start-Up

Unit . . . . . . . . . . . . . . . . . . . 19

Optional Accessories . . . . . . . . . . . 20

Fan . . . . . . . . . . . . . . . . . .21-22

Energy Recovery Wheel . . . . . . . . . . 22

Routine Maintenance Checklist

General . . . . . . . . . . . . . . . . .23

Fan Belts. . . . . . . . . . . . . . . . . 23

Fan Motors . . . . . . . . . . . . . . . . 23

Fan Wheel and Fasteners . . . . . . . . . . 24

Fan Bearings . . . . . . . . . . . . . . . 24

Filters . . . . . . . . . . . . . . . . . . 24

Door Seal Maintenance . . . . . . . . . . . 24

Energy Recovery Wheel Maintenance

Accessing Energy Recovery Wheel . . . . . 25

Removing Energy Recovery Wheel Segments 25

Cleaning Wheel or Segments . . . . . . . 25

Wheel Belt . . . . . . . . . . . . . . . 25

Wheel Bearing . . . . . . . . . . . . . 25

Parts List . . . . . . . . . . . . . . . . . 26

Sequence of Operation . . . . . . . . . . . 26

Troubleshooting – Airflow. . . . . . . . . . 27

Troubleshooting – Unit . . . . . . . . . 28-29

Maintenance Log . . . . . . . . . . . 30-31

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

Basic Operation

The ERVe brings in fresh, outdoor air and removes

stale, exhaust air. Prior to discharging the exhaust

air, the energy recovery wheel transfers energy from

the exhaust air to the outdoor air at an effectiveness

of 70-80%. Simply put, this unit preconditions the

outdoor air to save money on heating and cooling

costs.

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

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 and Access Panel Description

sections for more details.

Supplemental Installation,

Operation and Maintenance

Manuals

Refer to the following Installation, Operation and

Maintenance Manuals for additional details:

Part #462844 — Exhaust Weatherhood

WARNING

All factory provided lifting lugs must be used when

lifting the unit. Failure to comply with this safety

precaution could result in property damage, serious

injury or death.

Exhaust Blower

Supply

Blower

Exhaust Weatherhood

Outdoor Air Weatherhood

Enthalpy Wheel

Return Air from Building

Supply Air to Building Filters

Filters

Exhaust Air

Outdoor Air

4Model ERVe Energy Recovery Unit

Lifting with a Crane

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 all corner lifting points

provided on base structure.

4. Rigger to use suitable mating hardware to attach

to unit corner lifting points.

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.

Recommended Roof Opening

Unit Weights (lbs.)

Unit Size Approx. Weight

ERVe-20 825

ERVe-35 1100

ERVe-45 1275

ERVe-55 1550

EXHAUST

INLET

SUPPLY

OUTLET

1.63

Unit A B

ERVE-20 22 37

ERVE-35 25 44.5

ERVE-45 27 51.5

ERVE-55 27 60

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 intake of the unit into

prevailing wind and keep the intake away from any

other exhaust fans. Likewise, position the exhaust

discharge opening away from outdoor 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 “R”

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.

Unit Size A B

ERVe-20 22 37

ERVe-35 25 44.5

ERVe-45 27 51.5

ERVe-55 27 60

All dimensions are in inches.

The weights shown are a worst case scenario based

on the sheet metal and component weights for the

unit. These weights include sheet metal weights

added together with the largest motors, blowers and

accessories for the units.

Lifting with a Forklift

Unit base rail includes fork-able lifting locations. Use

weights shown to determine forklift size requirements.

Roof Curb and Rail Mounting

Model ERVe Energy Recovery Unit

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

Roof Curb Mounting

Roof curb details including duct location dimensions,

are available on Roof Curb Assembly Instructions,

Part Number 472119.

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. The GKD ships in a knockdown

kit (includes duct adapter) and requires ﬁeld

assembly (by others). Assembly instructions are

included with the GKD curbs.

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 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. Install Insulation: One-inch deep insulation

pans were provided with the curb assembly.

Install insulation prior to setting the unit.

Insulation is not included from the factory.

5. 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.

Unit Size L W LF WF Curb Weight

(lbs.)

ERVe-20 61.125 40.375 64.875 44.125 93

ERVe-35 63.375 48.5 67.125 52.25 106

ERVe-45 67.375 55.5 71.125 59.25 120

ERVe-55 78.25 65.5 82 69.188 148

All dimensions are in inches. Weights are for 14-inch high

GKD type curbs.

WLF

LENGTH WIDTH L INCLUDING FLANGE W INCLUDING FLANGE WEIGHT

ERVE-20 61.125 40.375 64.875 44.125 93

ERVE-35 63.375 48.5 67.125 52.25 106

ERVE-45 67.375 55.5 71.125 59.25 120

ERVE-55 78.25 65.5 82 69.188 148

Curb Outside Dimensions and Weights

4.844

1.549

0.775

Insulation Pan

(Insulation not included)

Unit Base

Roof Curb

1.895

Unit Side

Curb Cap Details for Factory Supplied Roof Curbs

Curb Outside Dimensions - continued

Recommended Discharge Duct Size and Length

Model Blower Size Duct Size Straight Duct Length

ERVe-20 9 14 x 14 36

ERVe-35 10 20 x 20 36

ERVe-45 12 20 x 20 36

ERVe-55 15 28 x 28 60

All dimensions shown in inches.

• Recommendedductsizesarebasedonvelocitiesacrossthe

cfm range of each model at approximately 800 feet per minute

(FPM) at minimum airflow and up to 1600 fpm at maximum

airflow. Recommended duct sizes are only intended to be a

guide and may not satisfy the requirements of the project.

Refer to plans for appropriate job specific duct size and/or

velocity limitations.

• Straightductlengthswerecalculatedbasedon100%effective

duct length requirements as prescribed in AMCA Publication

201. Calculated values have been rounded up to nearest foot.

Ductwork Connections

Examples of poor and good 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.

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

6Model ERVe Energy Recovery Unit

Unit Size A B

ERVE-20 5.75 18

ERVE-35 5.75 20.5

ERVE-45 6 22.5

ERVE-55 6 26

Isometric view of

ERVe on rails

Side view of

ERVe on rails

Unit Size A B

ERVE-20 5.75 18

ERVE-35 5.75 20.5

ERVE-45 6 22.5

ERVE-55 6 26

Unit Size AB

ERVe-20 5.75 18

ERVe-35 5.75 20.5

ERVe-45 6 22.5

ERVe-55 6 26

All dimensions are in inches.

Rail Mounting / Layout

 • RailsdesignedtohandletheweightoftheERVe

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 ERVe unit.

Avoid area dimensioned “B” below.

 • Railsshouldextendbeyondtheunitaminimum

of 12 inches on each side.

 • Setunitonrails.

Recommended Service Clearances

Unit Size A B C D

ERVe-20 24 24 42 35

ERVe-35 32 24 48 43

ERVe-45 32 24 54 43

ERVe-55 32 24 60 44

All dimensions are in inches.

Access Panel Description and

Location

Outdoor air filters

Frost control

Outdoor air sensors

Preheater and controls

Outdoor air intake damper

2Supply blower and motor

3Electric control center

Main disconnect

Energy wheel cassette

Exhaust air filters

Exhaust air intake damper

5Exhaust blower and motor

Outdoor air intake damper actuator

Service Clearances

ERVe units require minimum clearances to perform

routine maintenance, such as filter replacement,

energy wheel cassette inspection, and fan belt

adjustment. Blower and motor assemblies, energy

recovery wheel cassette and filter sections are always

provided with a service door

or panel for proper

component

access.

CLEARANCE

Model ERVe Energy Recovery Unit

Dimensional Data

Electrical Box

2-inch Filters

Energy Wheel

D A

Outdoor Air

Weatherhood

Exhaust Air

Weatherhood

CLEARANCE

Electrical Box

2-inch Filters

Energy Wheel

Exhaust Air

Weatherhood E

Outdoor Air

Weatherhood

CLEARANCE

SA Discharge

RA Intake

SA Discharge

RA Intake

EA Discharge

OA Intake

Unit Dimensions

Unit Size AB C D E

ERVe-20 67.0 50.8 46.3 17.8 20.8

ERVe-35 69.2 60.8 54.4 21.8 17.8

ERVe-45 72.2 67.1 60.2 21.8 19.2

ERVe-55 84.1 75.3 71.4 21.8 23.9

All dimensions are in inches. Door handles, hinges and

other protrusions are not included in the dimensions

above. Dimensions are rounded up to the nearest .1 inch.

Duct Dimensions

Unit Size AB C D EF G H

ERVe-20 11.8 18.0 12.2 10.7 15.8 18.0 10.8 25.8

ERVe-35 13.1 20.5 13.7 11.9 21.5 20.5 15.8 27.8

ERVe-45 15.8 22.5 16.1 14.0 24.5 22.5 18.8 29.1

ERVe-55 18.6 26.0 19.2 16.4 28.0 26.0 23.8 34.8

All dimensions are in inches.

Intake and Discharge Options

Unit Size Bottom Top Side End

ERVe-20 X

ERVe-35 X X

ERVe-45 X X

ERVe-55 X

OA - Outdoor Air

SA - Supply Air (to the space)

RA - Return Air (from the space)

EA - Exhaust Air

8Model ERVe Energy Recovery Unit

Electrical Information

The unit must be electrically grounded in accordance

with the current National Electrical Code, ANSI/NFPA

70. In Canada, use current CSA 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 through bottom of unit, run

the wiring through the curb, cut a hole in the cabinet

bottom, and wire to the disconnect switch. Seal

penetration in cabinet bottom to prevent leakage.

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

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.

CAUTION

High voltage wiring is run in the top roof panel(s)

of this unit. Do not install sensors or other devices

through the top panel(s).

WARNING

To prevent injury or death due to electrocution or

contact with moving parts, lock disconnect switch

open.

Most factory supplied electrical components are

prewired. 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.

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.

Field Control Wiring Length/Gauge

Total

Wire Length

Minimum

Wire Gauge

125 ft. 18

200 ft. 16

300 ft. 14

450 ft. 12

Model ERVe Energy Recovery Unit

Typical Control Center Components

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

234

Exploded Detail

of Terminal Strip

Access to Control Center Components

is gained through the access panel indicated.

Electric Heater Application/Operation

Factory installed electric heaters can be provided for

preheat frost control. An electric preheater warms

the outdoor air prior to the energy recovery wheel

to prevent frosting on the wheel. Electric heaters

are available in 208, 230, or 460 VAC (refer to heater

nameplate for voltage).

Preheaters: Preheaters are standard as single-stage

on/off control. Preheaters are single point wired at

the factory. A thermodisc temperature sensor (with

a 5°F 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 and the

wheel pressure drop sensor is triggered, the preheater

will turn on.

Access to the preheater

control panel is through

the outdoor air filter

door.

10 Model ERVe Energy Recovery Unit

Unit Accessories

Outdoor Air Weatherhood

Outdoor air 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. Outdoor

air dampers are factory mounted

and wired at the intake. Exhaust

air dampers, depending on the

unit configuration, may require

final installation. If your unit is

configured as return air intake on

the end of the unit, the exhaust air damper is factory

installed and wired. If your unit is configured with

the return air intake location on the bottom, final

installation is required per the instructions provided.

Exhaust Air Damper Installation

Instructions (bottom return air intake

conﬁguration only)

1. Open the exhaust air filter and wheel access door.

2. Remove exhaust air filters and possibly the energy

wheel for more working area inside the unit.

3. Remove the two screws holding the damper in

place as shown (save screws for step 7).

4. Bend the brackets holding the damper out and

away from the damper as shown in the Part

Removal drawing. Use caution while executing this

step, as the damper is heavy. Guide it into place

gently and avoid dropping it, as damage may

occur.

5. Once the damper is positioned as shown in the

Part Removal drawing, remove the four (4) screws

holding the shipping brackets in place.

6. Remove the shipping brackets and discard.

7. Insert screws removed in step 3 through the

damper flange in the same location they were

removed from.

Shipping Image

Final Installation

Part Removal

Step 4

Step 5

Step 4

Shipping Location

Shipping Image

Final Installation

Part Removal

Step 4

Step 5

Step 4

Part Removal

Shipping Image

Final Installation

Part Removal

Step 4

Step 5

Step 4

Final Installation

Model ERVe Energy Recovery Unit

• 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 (at outdoor air intake), an airflow pressure

switch and thermodisc temperature sensor (located

at the preheater) in addition to a pressure sensor

across the energy 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. The

thermodisc temperature sensor installed has a 5°F

nonadjustable set point. For custom temperature set

point thermodiscs, please contact the factory. Use the

following test procedure for troubleshooting.

Testing:

• Jumperoutthethermodisctemperaturesensor

and the wheel pressure sensor. The heater should

turn on.

• Ifitdoesn’t,eitherputtheoutdoorairsidedoors

on or temporarily jumper the airflow pressure

switch in the preheater control center to avoid

nuisance tripping of the pressure switch. Also

check the airflow switch pressure tap located

at the supply discharge blower to ensure the

tubing is connected and the tap is not blocked.

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 set point, 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 set point, the wheel will

run at reduced speed until the pressure differential

falls below the set point. 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.

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 intake

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 ensure 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 wheel 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 Timer Faceplate drawing below)

• Jumperthewheel

pressure switch in the

unit control center. 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. (normal 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.

Frost Threshold Temperatures

Indoor RH @ 70°F Frost Threshold Temp

20% -10º F

30% -5º F

40% 0º F

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

Optional Accessories

12 Model ERVe Energy Recovery Unit

Economizer Application/Operation

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

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 air intake 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 outdoor air intake

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 these steps 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 set point.

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:

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 set point.

Temperature

Sensor with

Override

Enthalpy

Sensor with

Override

TAO > TRA

Wheel runs at full speed.

(maximum energy recovery)

TAO < TRA

and

TAO > TSA

Wheel is stopped.

(no energy recovery)

TAO < TRA

and

TAO < TSA

Wheel will modulate to maintain

discharge temperature.

Enthalpy

Controller

Model ERVe Energy Recovery Unit

Factory Set Points

Variable Frequency Drives (VFDs) for the blowers are

factory setup to operate in one of the three following

modes:

Modulating: 0-10 VDC signal wired in the field by

others varies the speed of the blower between 30

and 60Hz

Multispeed: Digital contact closures by others

command the VFD to run at multiple speed settings:

 •SCtoS4-Driverunsat40Hz

 •SCtoS5-Driverunsat30Hz

CO2 Sensor: A digital contact closure from an

optional factory provided CO2 sensor sends the

VFD to high or low speed depending on CO2 ppm

levels at the sensor.

The terminal locations for Modulating (option 1) and

Multi-speed (option 2) are shown on the left. Most

of the set points in the VFDs are Yaskawa factory

defaults. However, a few set points are changed at

Greenheck and are shown in the tables on the next

page. These settings are based on the VFD mode

selected.

To gain access to change set points on the V1000 and

J1000drives,parameterA1-01needstobesetat“2”.

To prevent access or tampering with drive settings on

either drive, change parameter A1-01 to “0”.

Drive Operation

SC to S1 contact for On/Off

A1 (0-10 VDC) referenced to AC. Can use +15 VDC

from +V

Variable Frequency Drives for Energy Recovery Blowers

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

for modulating or multispeed control of the blowers. One VFD is provided for each blower (supply air and

exhaust).TheVFD’sprovidedareeitherYaskawamodelV1000orJ1000.Refertothetablesinthissection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 manual for reference). When making adjustments outside of

the factory set points, 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.

MA MB MCRPH1SCHCS7S6S5S4S3S2S1

MPACAMAC+VA2A1PCP2P1

IGS-S+R-R+

V1000

MA MB MCACAMAC+VA1SCS5S4S3S2S1

J1000

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

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

OPTION 2 - MULTI SPEED CONTROL

S5S4 SC 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 A1-01 CHANGE TO 2

PARAMETER d1-02 FOR NEW 40Hz SETTING

PARAMETER d1-01 FOR NEW 60Hz SETTING

PARAMETER d1-03 FOR NEW 30Hz SETTING

PARAMETER A1-01 CHANGE TO 0

USER TO PROVIDE CONTACTS AND ISOLATION

AS REQUIRED

SEE VFD INSTALLATION MANUAL FOR MORE DETAIL

14 Model ERVe Energy Recovery Unit

Parameter Setting–J1000

A1-01 Access Level 2

b1-17 VFD Auto Start 1

C6-02 Carrier Frequency 2

d2-01 Ref Upper Limit 40% or 50%*

d2-02 Ref Lower Limit 5%

E2-01 Motor Rated FLA Motor FLA

E2-03 Motor No-Load Current Must be less

than FLA

H1-02 Multi-Function Input

(Terminal S2) 6

H2-01 Multi-Function Output

(MA, MB, MC) 5

Economizer Signal Source

(0-10 VDC)

Setting

Honeywell

Module

Carel

Controller

H3-03 Analog Frequency Reference

(Gain) 0 100

H3-04 Analog Frequency Reference

(Bias) 99 0

L1-01 Elect Thermal Overload 2

L4-01 Frequency Detection Level 15

A1-01 Access Level 0

*30 through 64 inch wheels are 40% (24 Hz)

74 inch wheel is 50% (30 Hz)

MODULATING CONTROL FOR FAN SPEED

(0-10 VDC)

Parameter Setting

V1000 J1000

A1-01 Access Level 2 2

b1-17 VFD Start-Up Setting 1 1

C1-01 Acceleration Time 30 sec. 30 sec.

C1-02 Deceleration Time 30 sec. 30 sec.

C6-02 Carrier Frequency 1 1

d2-02 Ref Lower Limit 50% 50%

E2-01 Motor Rated FLA Motor

FLA

Motor

FLA

H3-04 Terminal A1 Bias 50% 50%

A1-01 Access Level 0 0

MULTI-SPEED CONTROL FOR FAN SPEED

(1/3 OR 1/2 SPEED REDUCTION)

Parameter Setting

V1000 J1000

A1-01 Access Level 2 2

b1-01 Reference Source (Frequency) 0 0

b1-17 VFD Start-Up Setting 1 1

C1-01 Acceleration Time 30 sec. 30 sec.

C1-02 Deceleration Time 30 sec. 30 sec.

C6-02 Carrier Frequency 1 1

d1-01 Frequency Reference 1 60 Hz 60 Hz

d1-02 Frequency Reference 2 40 Hz 40 Hz

d1-03 Frequency Reference 3 30 Hz 30 Hz

d1-04 Frequency Reference 4 60 Hz 60 Hz

d2-02 Ref Lower Limit 50% 50%

E2-01 Motor Rated FLA Motor

FLA

Motor

FLA

H1-04 Multi-Function Input Sel 4

(Terminal S4) 3 3

H1-05 Multi-Function Input Sel 5

(Terminal S5) 4 4

H1-06 Multi-Function Input Sel 6

(Terminal S6) 5 NA

H3-10 A2 Not Used F NA

A1-01 Access Level 0 0

CO2 SENSOR CONTROL FOR FAN SPEED

(1/2 SPEED WHEN C02 DROPS BELOW 700 PPM)

(FULL SPEED WHEN C02 RISES ABOVE 800 PPM)

Parameter Setting

V1000 J1000

A1-01 Access Level 2 2

b1-01 Reference Source (Frequency) 0 0

b1-17 VFD Start-Up Setting 1 1

C1-01 Acceleration Time 30 sec. 30 sec.

C1-02 Deceleration Time 30 sec. 30 sec.

C6-02 Carrier Frequency 1 1

d1-01 Frequency Reference 1 60 Hz 30 Hz

d1-02 Frequency Reference 2 30 Hz 60 Hz

d2-02 Ref Lower Limit 50% 50%

E2-01 Motor Rated FLA Motor

FLA

Motor

FLA

H3-10 A2 Not Used F NA

A1-01 Access Level 0 0

Variable Frequency Drives for Energy

Recovery Wheel

Optional factory installed VFD for the energy recovery

wheel is programmed at the factory per the settings

shown below for economizer and frost control modes.

TheVFDprovidedisaYaskawamodelJ1000.Refer

to the VFD instruction manual that ships with the unit

when making adjustments.

Factory Set Points - continued

Resetting the V1000 drive to factory defaults

To reset the V1000 drive back to Greenheck factory

defaults go to parameter A1-01 and set it to “2”.

Then go to A1-03 and change it to “1110” and press

enter. The drive is now reset back to the settings

programmed at Greenheck. This option is not

availableontheJ1000.

Model ERVe Energy Recovery Unit

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 FACTORY. 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 FA N

S2 1

ROTATION SENSOR

ON VFD-W

TO MA AND MC

THERMOSTAT(S) TS1,

24 VACTHERMOSTAT CONTROLLER(S)

OA-SENSOR

SENSOR COM

PS2

PS3

Typical Wiring Diagram

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.

16 Model ERVe Energy Recovery Unit

Rotation 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 Sensor

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 unit control center.

To adjust the switch, the unit must be running with

all of the access doors in place. 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).

Whether there is power or not, turn the adjustment

screw on the dirty filter gauge (clockwise if you did

not have power, counterclockwise if you did have

power) until the power comes on or just before the

power goes off. 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.

Setscrew (on front of switch) must

be manually adjusted after the

system is in operation.

Negative pressure connection

is toward the ‘front or top’ of

the switch. (senses blower side

of filters)

Positive pressure connection is toward the ‘back or

bottom’ of the switch. (senses air inlet side of filters)

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.

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.

Vapor Tight Lights

Vapor tight lights provide light to each of the

compartments in the energy

recovery unit. The lights are wired

to a junction box mounted on the

outside of the unit. The switch to

turn the lights on is located in the

unit control center. The switch

requires a separate power source

to allow for power to the lights

when the unit main disconnect is

off for servicing.

Model ERVe Energy Recovery Unit

Remote Control Panel and Wiring

Schematics

Indicator Lights powered by the ER Unit

Dirty Filter Indicator (power by others)

Refer to Pressure Switch for voltage and load ratings.

7-Day Timer or On/Off Switch

7-Day Timer

S1 - Unit On/Off

Terminal Block

in Unit

Control Center

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

Red wires should be capped off.

Off BMS

Auto

Terminal Block

in unit

Control Center

Hand/Off/Auto Switch

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.

The remote panel is a series of junction boxes ganged

together and includes a stainless steel faceplate. 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

 • Economizerlight

 • Frostcontrollight

 • Exhaustairdirtylterlight

 • Outdoorairdirtylterlight

 • Wheelrotationsensorlight

Refer to Electrical Connections section for Field Control

Wiring recommendations.

NC C

Exhaust Dirty Filter

Supply Dirty Filter

Rotation Sensor

Economizer

PS2

PS3

Frost Control

Unit On/Off

Exhaust Dirty Filter

Supply Dirty Filter

Hot

PS2

PS3

18 Model ERVe Energy Recovery Unit

Temperature Sensors - 1K Ohm RTD

Drawing Labels Terminal Strip Labels

OAI OA/Supply Inlet Temp

OAAW OA After Wheel

RAI RA/Exhaust Inlet Temp

OAD Supply Discharge Temp

EAW Exhaust After Wheel Temp

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-A Supply Fan Amps

EF-A Exhaust Fan Amps

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.

RAI

RAF-P

FILTER

OAAWOAF-A

OAD

SUPPLY

BLOWER

INSIDE

FROM

INSIDE

EW-P

OAW-P

ENERGY WHEEL

EAWEF-A

OAI

FILTER

OAF-P

OUTSIDE

FROM

OUSTIDE

EXHAUST

BLOWER

Model ERVe Energy Recovery Unit

Start-Up 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 Install exhaust inlet motorized damper (see Unit

Accessories section)

General Start-Up Information

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.

Unit Model Number _______________________________

(e.g. ERVe-20)

Unit Serial Number _______________________________

(e.g. 10111000)

Energy Wheel Date Code __________________________

(e.g. 0450)

Start-Up Date _______________________________

Start-Up Personnel Name __________________________

Start-Up Company _______________________________

Phone Number _______________________________

Pre Start-Up Checklist – check 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.

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.

WARNING

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.

Do not operate energy recovery ventilator without

the filters and birdscreens installed. They prevent

the entry of foreign objects such as leaves, birds,

etc.

CAUTION

Do not run unit during construction phase. Damage

to internal components may result and void

warranty.

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.

Check line voltage at unit disconnect

_______ L1-L2 volts

_______ L2-L3 volts

_______ L1-L3 volts

Motor Amp Draw

  •SupplyFan •ExhaustFan

_______ L1 amps ______ L1 amps

_______ L2 amps ______ L2 amps

_______ L3 amps ______ L3 amps

  •EnergyWheel

_______ L1 amps

_______ L2 amps

_______ L3 amps

Fan RPM

_______ Supply Fan ______ Exhaust Fan

Correct fan rotation direction

Supply Fan Yes / No

Exhaust Fan Yes / No

SPECIAL TOOLS REQUIRED

• VoltageMeter(withwireprobes)

• AmperageMeter

• Thermometer

• Tachometer

• Inclinemanometerorequivalent

20 Model ERVe Energy Recovery Unit

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

Yes No Frost Control set point 5ºF

Differential 2ºF

Timer Refer to IOM

Yes No Frost Control Modulating Refer to IOM

Economizer Application / Operation section:

Yes No Economizer (temperature)

Set point 65ºF

Offset 20ºF

Differential 2ºF

Yes No Economizer (enthalpy)

Set point D

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

Optional Accessories Checklist

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.

Model ERVe Energy Recovery Unit

Unit Start-Up

Refer to Parts List section for component locations.

Fans

The ERVe models contain

two forward curved (supply &

exhaust) fans. 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.

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.

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 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.

Fan Belt Drives

The fan belt drive components, when supplied by

Greenheck, have been carefully selected for the

unit’s specific operating condition. Utilizing different

components than those supplied could result in

unsafe operating conditions which may cause

personal injury or failure of the following components:

 •FanShaft • Bearings •Motor

 •FanWheel • Belt

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

diagrams in this section).

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.

Belt Span

Deﬂection = Belt Span

WRONG WRONG

WRONG CORRECT

WRONG WRONG WRONG CORRECT

FAN MOTOR FAN

MOTOR

Forward Curved

Exhaust Fan

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. Multigroove 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.

Backward Inclined

Forward Curved

Airﬂow

Backward Inclined

Forward Curved

Airﬂow

22 Model ERVe Energy Recovery Unit

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.

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.

Wheel Unbalance

Drive Pulley Misalignment

Incorrect Belt Tension

Bearing Misalignment

Mechanical Looseness

Faulty Belts

Drive Component Unbalance

Poor Inlet/Outlet Conditions

Foundation Stiffness

Drive Belt

Inspect the drive belt. Make sure the belt rides

smoothly through the pulley and over the wheel rim.

Air Seals

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,

follow the instructions in the 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) the wheel should rotate freely at about

20-40 RPM.

Energy Recovery Wheel

The ERVe models contain a total 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”.

Turn the energy

recovery wheels

by hand to verify

free operation.

The wheel should

rotate smoothly

and should not

wobble. Inside layout of ERVe

Drive Belt

Adjustable

Air Seals

Label

showing

cassette

serial #

and date

code

Bearing

Support

Drive Pulley

Model ERVe Energy Recovery Unit

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 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,

ensure 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.

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 one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 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.

Routine Maintenance

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

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.

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:

Lubrication

Apply lubrication where required

Dampers

Check for unobstructed operation

Fan Belts

Check for wear, tension, alignment

Motors

Check for cleanliness

Blower Wheel & Fasteners

Check for cleanliness

Check all fasteners for tightness

Check for fatigue, corrosion, wear

Bearings

Check for cleanliness

Check set screws for tightness

Lubricate as required

External Filter

Check for cleanliness - clean if required

Internal Filter

Check for cleanliness - replace if required

Door Seal

Check if intact and pliable

Energy Recovery Wheel

Check for cleanliness - clean if required

Check belt for wear

Check pulley, bearings, and motor

Maintenance Procedures:

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.

Belt Span

Deflection = Belt Span

24 Model ERVe Energy Recovery Unit

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.

Bearings

Most bearings are permanently lubricated and require

no 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 zerk fittings 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.

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.

Clean filters by rinsing with a mild detergent in warm

water.

Internal Filter Maintenance

The ERVe units are always 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 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 seal is installed on the door. Inspect at

least annually to ensure that seal is still pliable and

intact.

Filter Size and Quantities

Unit Size Pleated Filter Size Quantity

Supply Exhaust Supply Exhaust

ERVe-20 20 x 20 20 x 20 2 2

ERVe-35 16 x 20 16 x 25 3 3

ERVe-45 20 x 25 20 x 25 3 3

ERVe-55 16 x 20 16 x 20 6 6

All dimensions in inches.

Model ERVe Energy Recovery Unit

Accessing the Energy Recovery Wheel

Disconnect power to the ERVe. Open door labeled

“Energy Wheel Cassette Access”.

Unplug the wheel drive motor.

Pull the wheel cassette halfway out.

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.

Removing the Energy Recovery Wheel Segments

(stainless steel rim)

Steel retainers are located on the inside of the wheel

rim. Push the retainer towards the center of the

wheel, then lift up and away to release segments.

Wheel segment removed

Bracket Segment

Retainer

Lift away from

segment

Catch Segment

Retainer

Push toward center

Center of Wheel

Spoke

Inside of wheel rim

Important! Place retainers back in the original

position before rotating the energy recovery wheel,

otherwise damage to retainer will occur.

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 Fantastik® 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.

CAUTION

Do not clean energy recovery wheel segments with

water in excess of 140ºF (60ºC).

Do not dry energy recovery wheel segments in air in

excess of 140ºF (60ºC).

The use of a pressure washer to clean segments is

not recommended. Damage could result.

Energy Recovery Wheel Belt

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.

Energy Recovery Wheel Bearing

In the unlikely event that

a wheel bearing fails,

the bearing is behind

a removable plate on

the wheel support

beam. Contact the local

Greenheck representative

for detailed instructions

on how to replace the

bearing.

Wheel Bearing

Wheel Belt & Pulley

26 Model ERVe Energy Recovery Unit

Parts List

1. Supply blower

• Forwardcurvedfan

• Adjustablemotormountforbelttensioning

• Adjustablesheavesforspeedcontrol

Not depicted on this image

2. Vibrations isolators (quantity 4 per blower)

• Neoprene

3. Energy recovery wheel cassette

4. Removable energy recovery wheel segments

5. Standard supply weatherhood with 2-inch

aluminum mesh filter

6. Standard exhaust weatherhood with birdscreen

Not depicted on this image

7. Standard supply and exhaust air filter racks for

2-inch 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. Exhaust blower

• Forwardcurvedfan

• Adjustablemotormountforbelttensioning

• Adjustablesheavesforspeedcontrol

Not depicted on this image

Sequence of Operation

Basic Unit

The ERVe units are prewired 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 optional motorized dampers open. The ERVe is

normally slaved (24 volt) to the roof top air handler.

When the roof top air handler starts, the auxiliary

contactor in the air handler closes to start the ERVe.

Summer Operation

Outdoor air is preconditioned (temperature and

moisture levels are decreased) by the transfer of

energy from the cooler, drier, exhaust air via the

energy recovery wheel. The preconditioned air is

typically mixed with return air going back to the air

handler for final conditioning.

Economizer Operation: Refer to Economizer

Application/Operation section.

Winter Operation

Outdoor air is preconditioned (temperature and

moisture levels are increased) by the transfer of

energy from the warmer, more humid exhaust air via

the energy recovery wheel. The preconditioned air is

typically mixed with return air going back to the air

handler for final conditioning.

Frost Control Operation: Refer to Frost Control

Application/Operation section.

Other Accessories:

Rotation Sensor: Refer to Optional Accessories

section

Dirty Filter Sensor: Refer to Optional Accessories

section

CO2 Sensor: Refer to Optional Accessories section

VFD on Blowers: VFDs on blowers are often used

as part of a demand control ventilation system. This

type of system takes advantage of varying occupancy

through the use of CO2 sensors to monitor space CO2

levels. If CO2 levels are low in the space, the VFD will

operate the blowers at minimum airflow required by

code. As the space occupancy increases and CO2

levels increase, the VFD will increase the amount

of fresh outdoor air being brought in to offset the

CO2 levels in the space (exhaust airflow is increased

proportionally as outdoor airflow increases). As CO2

levels come back down, the airflow will decrease

back to minimum requirements.

Model ERVe Energy Recovery Unit

Troubleshooting – Airﬂow

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

Nameplate 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

28 Model ERVe Energy Recovery Unit

Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or

service information.

Symptom Possible Cause Corrective Action

Blower fails to

operate

Blown fuse or open circuit breaker. Replace fuse or reset circuit breaker and check

amps.

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.

Motor starters

“chatter” or

do not pull in

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. Consult

Factory 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 over amps

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.

Shorted windings in motor. Replace motor.

Low airflow (cfm)

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.

High airflow (cfm)

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.

Troubleshooting – Unit

Model ERVe Energy Recovery Unit

Troubleshooting – Unit

Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or

service information.

Symptom Possible Cause Corrective Action

One or both

blowers turn off

intermittently and

back on after

about 2 minutes

Exhaust Only frost control sensors are tripping. Adjust frost temperature sensor set point as

needed.

Energy wheel does

NOT turn

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).

VFD overload. (OL1 on readout) Refer to VFD section. Compare motor amp

rating to setting in VFD. Adjust accordingly.

Energy wheel runs

intermittently

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.

Excessive noise

or vibration

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

hub or bearing collars on shaft.

Bearings. Replace defective bearing(s). Lubricate

bearings. Tighten collars and fasteners.

Wheel out of balance. Replace or rebalance.

Loose wheel on shaft. Tighten wheel setscrew.

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.

Buildup of material on wheel. Clean wheel and housing.

Bearing and drive misaligned. Realign.

Noise being transmitted by duct.

Make sure ductwork is supported properly.

Make sure ductwork metal thickness is sized for

proper stiffness. Check duct size at discharge to

ensure that air velocities are not too high.