Greenheck Fan Ventilation Hood PVE 20 User Manual

Part #472846

Heat Recovery Ventilators

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.

Models: PVe-20

PVe-35

PVe-45

PVe-55

General Safety Information

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 affects 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.

DANGER

Always disconnect power before working on or near

this equipment. Lock and tag the disconnect switch

or breaker to prevent accidental power up.

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.

CAUTION

When servicing the unit, the internal components

may be hot enough to cause pain or injury. Allow

time for cooling before servicing.

6. Verify that the power source is compatible with the

equipment.

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

running.

CAUTION

Precaution should be taken in explosive

atmospheres.

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Table of Contents

Basic Operation

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

Installation

Supplemental Installation, Operation and

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

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

Installation Stages . . . . . . . . . . . . . 4

Lifting with a Crane or Forklift . . . . . . . . 4

Roof Curb and Rail Mounting

The PVe brings in fresh outdoor air and removes stale

exhaust air from the building. Prior to discharging

the exhaust air, the plate heat exchanger transfers

energy from the exhaust air to the incoming outdoor

air. When used in the cooling mode, heat energy is

transferred from incoming outdoor air to the exhaust

air. Simply put, this unit preconditions the outdoor air

to save money on heating and cooling costs.

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

Service Clearances . . . . . . . . . . . . 5

Roof Curb Mounting . . . . . . . . . . . . 6

Curb Dimensions and Weights . . . . . . . . 6

Ductwork Connections . . . . . . . . . . . 6

Rail Mounting / Layout . . . . . . . . . . . 7

Access Panel Description and Location . . . 7

Dimensional Data . . . . . . . . . . . . . 8

OUTDOOR

AIR

Drain Trap

Electrical Information

General Electrical Information . . . . . . . . 9

Control Center Components. . . . . . . . . 10

Electric Heater Application/Operation . . . . . 10

Optional Accessories

SIDE VIEW

RETURN DUCT

SUPPLY DUCT

Frost Control Application/Operation . . . . . 11

Economizer Application/Operation . . . . . . 11

Variable Frequency Drives and Wiring . . . . 12-13

Typical Wiring Diagram . . . . . . . . . . . 14

Sensors and Lights . . . . . . . . . . . . 15

Remote Control Panel and Wiring . . . . . . 16

Sensors Mounted by Factory . . . . . . . . 17

Sequence of Operation

Supplemental Installation,

Operation and Maintenance

Manuals

Refer to the following Installation, Operation and

Maintenance Manuals for additional details:

Part #462844 — Exhaust Weatherhood

Start-Up

Additional manuals are available for each accessory

used in the PVe. These additional manuals are

provided by the respective manufacturers and are

included with unit shipment.

General Start-Up Information . . . . . . . . 18

Optional Accessories . . . . . . . . . . . 19

Unit Start-Up, Fans . . . . . . . . . . 20-21

Routine Maintenance Checklist

Overview. . . . . . . . . . . . . . . . . 22

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

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

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

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

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

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

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

Parts List . . . . . . . . . . . . . . . . . 25

Sequence of Operation . . . . . . . . . . . 25

Troubleshooting – Airflow. . . . . . . . . . 26

Troubleshooting – Unit . . . . . . . . . .27-28

Maintenance Log . . . . . . . . . . . 29-31

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

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.

WARNING

All factory provided hoisting and fork lifting points

must be used when lifting the unit. When rigging for

hoisting with a crane, spreader bars must be used.

Failure to comply with this safety precaution could

result in property damage, serious injury or death.

See Installation Stages for additional details.

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Installation Stages

Lifting

Once the PVe Heat Recovery Ventilator is delivered

to the jobsite, the actual installation occurs in several

distinct stages.

1. Installation location must be carefully considered.

Service clearances needed for later maintenance

of the unit must be taken into consideration,

access to Return Air and Discharge Air ducting

must be anticipated. And structural support

of the unit must be taken into consideration.

See appropriate sections of this manual for

further information. If electric wiring is going

to be brought into the cabinet from beneath

(recommended), preparations for that step must

be taken during the planning stage. If possible, a

GKD curb should be installed prior to installation

of roofing materials so that flashing can be run up

the sides of the curb.

Forklift lifting

points

Crane hoisting points

(typical)

Lifting with a Crane

2. Hoisting the cabinet can be accomplished with

either a crane or a fork lift. If a forklift is used, the

forks must extend all the way through the cabinet

and project from the far side. The forks should

be padded with a layer of ¼-inch thick plywood

or other suitable material. If a forklift is used, the

cabinet cannot be lowered directly onto the GKD

curb unit because the forks will be in the way. It

will be necessary to set the unit onto appropriate

dunnage for final lowering after the forks are

removed.

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 simultaneously hoisting

at all four corner lifting points provided on base

structure, ensuring proper load distribution and

support at each corner.

4. Rigger to use suitable mating hardware to attach

to unit corner lifting points.

5. Spreader bar(s) must

If a crane is used, hoisting points are provided at

each corner of the cabinet. Small, padded hooks

must be inserted into the hoisting points. There

is very little internal clearance inside the cabinet

base and the use of large lifting hooks will either

dig into the cabinet structure or else interfere with

the seating of the cabinet on the GKD curb.

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.

2. Physical installation of the unit should be

completed prior to installation of electrical wiring.

Condensate drains should be connected and if

necessary, heat strips installed on the drains to

prevent freezing of the traps. A final check should

be made to ensure that the unit has been installed

level by using the bottom of the cabinet as a

reference, not the top (the cabinet roof is sloped

to the rear). Ensure that all ductwork has been

properly and permanently assembled.

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 the unit and setting on

the curb.

The weights shown are a

worst case scenario based

Unit Weights (lbs.)

Approx.

Weight

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.

3. Prior to wiring the unit, installer should verify that

all optional accessories are accounted for. Verify

that electric components such as motors are rated

properly for the voltage actually being used. Note

that some of the illustrations and pictures used in

this manual show the use of three phase power

and if the user actually has single phase power,

there will be minor variations present. The unit

should be wired according to the supplied wiring

diagrams and Best Practices. Careful testing

and balancing of the power source should be

accomplished at this time.

Model

PVe-20

PVe-35

PVe-45

PVe-55

1300

1600

2100

2700

Lifting with a Forklift

Unit base rail includes forklift lifting locations. Use

weights shown to determine forklift size requirements.

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Service Clearances

Roof Curb and Rail Mounting

When installed on a roof, a typical installation

will include at least one roof penetration in order

to deliver return air to the unit from the space.

Additionally, a second roof penetration may be used

for supply air discharge to the space.

Intake and Discharge Options

Option

OA Intake

Bottom

Top

Side

End

SA Discharge

RA Intake

EA Discharge

OA - Outdoor Air

Model

SA - Supply Air (to the space)

RA - Return Air (from the space)

EA - Exhaust Air

(920)

(1530)

PVe-20

(1220)

(920)

(1530)

PVe-35

PVe-45

PVe-55

EA Discharge

(1530)

(920)

(1530)

SA Discharge

(1830)

(920)

(1530)

SA Discharge

All dimensions are shown in inches (millimeters). The

weatherhoods include 2-inch aluminum mesh filters that

are removed out of the end of the hood as shown in this

drawing and require extra clearance for removal.

OA Intake

Do not face the Outdoor Air Intake of the unit into

prevailing wind and also keep the air intake away

from any other exhaust fans. Likewise, position the

Exhaust Air Discharge opening away from any other

outdoor air intakes of other equipment.

RA Intake

When cutting duct openings, cut opening one inch

larger (25 mm) 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 five (5). If area within curb is left open,

higher radiated sound levels may result.

Duct Dimensions

Model

10.7

(280)

12.2

(310)

10.3

(270)

11.8

(300)

22.0

(570)

14.0

(360)

PVe-20

11.9

(310)

13.7

(350)

11.4

(290)

13.1

(340)

14.0

(360)

34.0

(870)

PVe-35

PVe-45

PVe-55

Where the supply or warm air duct passes through

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.

14.1

(360)

16.0

(410)

13.3

(340)

14.5

46.0

14.0

(370) (1170) (360)

16.4

(420)

19.2

(490)

15.9

(450)

18.6 60.0 14.0

(480) (1530) (360)

All dimensions are shown in inches (millimeters).

Position the unit roof opening such that the Return Air

Intake will line up with the corresponding ductwork.

If applicable, adjust position to also accommodate

the SA Discharge vent. Make certain that proposed

positioning of the unit still maintains recommended

service clearances.

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Roof Curb Mounting

Curb Dimensions and Weights

Roof curb assembly and mounting instructions are

contained in the Roof Curb Assembly Instructions

supplied with Model GKD roof curb.

Rooftop PVe units require curbs to be mounted first,

in accordance with their appropriate instructions.

Curb unit is to be installed and then duct connections

are to be made prior to setting of the unit.

1 Factory Supplied Roof Curbs: Roof curbs are

Model GKD. The GKD ships in a knockdown kit

(which includes duct adapter) and requires ﬁeld

assembly by others. Assembly instructions are

included with the GKD curbs.

2 Install Curb: Locate the assembled curb over

roof opening and verify precise location of curb

relative to the roof opening, in accordance with

dimensions given previously. Fasten curb loosely

in place and then shim as needed to ensure a

level installation. Tighten roof fastening hardware

and then re-check for level. Verify that diagonal

dimensions of installed curb are plus or minus

1/8-inch of each other.

3 Install Ductwork: Install needed ductwork in

accordance with SMACNA and AMCA guidelines.

Duct adapter is provided to support ducts prior

to setting the unit.

Curb Weight

(lbs.)

Unit Size

PVe-20

PVe-35

PVe-45

PVe-55

99.4

36.8

44.6

56.3

71.3

195

216

261

316

105.9

111.7

All dimensions are shown in inches.

4 Install Insulation: One-inch deep insulation

pans are provided with the curb assembly. Set

the insulation pans per instructions and then

install insulation in the pans prior to setting

the unit. Insulation is not provided by the unit

manufacturer, it is to be supplied by others.

5 Set the PVe Unit: Lift unit to a point directly

above the curb and duct openings. Guide unit

carefully while lowering in order to align with duct

openings. The roof curb will seat in a recess in

the base of the PVe unit. Verify that the unit is

properly seated on the curb and is level.

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

POOR

Length of Straight Duct

installation will

result in low

Unit Side

airflow and other

system effects.

Unit Base

1.895

GOOD

Recommended Discharge Duct Size and Length

Unit Size Blower Size Duct Size Straight Duct Length

Insulation Pan

PVe-20

PVe-35

PVe-45

PVe-55

14 x 14

20 x 20

28 x 28

4.844

Roof Curb

All dimensions are shown in inches.

1.549

0.775

•

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.

Dimensions are shown in inches.

•

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.

Curb Cap Details for Factory Supplied Roof Curbs

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Rail Mounting / Layout

Access Panel Description and

Location

An alternative method of unit installation is to mount

the unit on rails supplied by others. The purpose of

mounting the unit on either rails or the GKD curb is to

elevate the unit away from moisture conditions and

to provide proper clearance for installation of water

drain traps.

• Rails should be designed to handle the weight of

the PVe unit, taking into consideration weight per

square inch on bearing surfaces. Rails should be

positioned as shown in the drawing below, taking

into consideration proper load distribution and

support by roof support elements.

• Make sure that rail positioning does not interfere

with either the RA Intake duct or the optional

straight down SA Discharge duct.

• Rails should extend beyond the unit a minimum

of 12 inches.

• Set unit on rails.

Filters

Optional OA Damper

Optional RA Damper

Optional Face and Bypass Dampers

Plate Heat Exchanger

Optional Preheater

Plate Heat Exchanger

Control Center

Blowers

Isometric view of

PVe on rails

Side view of

PVe on rails

Unit Size

PVe-20

PVe-35

PVe-45

PVe-55

13.25

12.00

15.50

18.75

7.75

6.50

10.5

13.25

All dimensions are shown in inches.

*Zones B and C identify regions/zones where rails may

not be place due to ductwork.

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Dimensional Data

Drain Trap

The PVe plate heat exchanger is provided with two

stainless steel drain pans and each is equipped with

a one inch MPT drain fitting. A drain trap must be

installed on each drain fitting to allow excess water

to flow out of the drain pans. More importantly,

though, due to the negative internal static pressure

inside the PVe cabinet, installing drain traps prevents

outdoor air from being pulled into the cabinet and

consequently causing overfilling of the drain pans or

misting of PVe components.

Exhaust

Air Hood

Bypass

Damper

Face

Damper

Plate Heat

Exchanger

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 negative static pressure inside the PVe

cabinet. An assumption of 3.0 in. wg differential is

normally sufficient for all PVe units and this would

require a trap design as shown. If the internal static is

believed to be higher, consult the factory.

Control Center

Top view

Outdoor

Air Hood

Plate Heat

Exchanger

4 in.

2 in.

Side view

Unit

Size

Refer to local codes to determine drainage

requirements. If draining onto a roof, place a drip pad

beneath the drain outlet to protect the roof. If draining

onto a roof is not acceptable, a drain line must be

attached to the drain trap. The drain line must be

pitched away from the unit at least 1/8-inch per foot.

On longer runs, an air break should be incorporated

to ensure proper drainage. Local codes may require

drainage into a waste water system.

104.1

(2650)

59.7

(1520)

41.5

(1060)

20.3

(520)

20.7

(530)

PVe-20

104.1

(2650)

59.7

(1520)

49.2

(1250)

25.2

(640)

17.7

(450)

PVe-35

PVe-45

PVe-55

110.6

(2810)

59.7

(1520)

61.1

(1560)

25.2

(640)

19.0

(490)

Drainage problems result not only from improper

drain trap design, but also from lack of maintenance

in the PVe cabinet. Algae can form in the drain pans

and traps and cause reduced water flow, which can

in turn result in a backup in the drain system. Regular

maintenance and inspection will prevent this from

occurring. If the drains have a cleanout opening, be

sure and close the opening after cleaning and refill

the trap with water.

116.5

(2959)

59.7

(1520)

76.1

(1940)

25.2

(640)

23.8

(610)

All dimensions are shown in inches (millimeters).

Door handles, hinges and other protrusions are not

included in the dimensions above. Dimensions are

rounded up to the nearest .1 inch (2.54 millimeters).

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Electrical Information

CAUTION

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 and comply with

any local ordinances or electrical power 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 main disconnect (door interlocking disconnect

switch standard on most units) or distribution block

and must be compatible with the ratings shown 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 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.

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.

If field installing an additional disconnect switch, it

is recommended that there be 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.

Field Control Wiring Length/Gauge

Total

Wire Length

Minimum

Wire Gauge

125 ft.

200 ft.

300 ft.

450 ft.

If power supply is desired through the bottom of unit,

run the wiring through the curb, cut properly aligned

holes in the insulation pan and the bottom of the PVe

cabinet bottom and wire to the disconnect switch.

Seal penetrations to prevent leakage or air infiltration.

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.

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.

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.

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 the 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

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Typical Control Center Components

1. Main Disconnect (non-fusible, lockable)

2. Motor Starter

3. Motor Starter

4. Power Distribution Blocks

5. 24 VAC Control Transformer

6. 24 VAC Terminal Strip

7. Temperature Sensor with Override (used for

Economizer Mode)

Electric Heater Application/Operation

Factory installed electric heaters are optionally

provided in order to provide preheat frost control.

An electric preheater warms the outdoor air prior to

being drawn through the PVe plate heat exchanger.

Electric heaters are available in 208, 230, or 460 VAC.

Refer to heater nameplate for voltage rating.

Preheaters: If an optional preheater is supplied with

the unit, it is installed as a single stage on/off control.

Preheaters are single-point wired at the factory. A

thermocouple type

8. Dirty Filter Sensor

9. Dirty Filter Sensor

temperature sensor

is mounted in the

outdoor airstream

after the preheater and

that thermocouple will

switch the preheater

on. See Frost Control

Application/Operation

for typical set points.

If the temperature falls

below the set point

and a pressure drop

sensor is triggered, the

preheater will turn on.

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Optional Accessories

Timed exhaust frost control includes a timer in

addition to the thermostat and pressure sensor. The

timer is located on the right hand side of the control

module (low voltage side). 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 cube. Default factory settings are

5 minutes off and 30 minutes on.

Frost Control Application/Operation

Cold climates, in combination with higher indoor

humidity levels, may cause frost to form on the plate

heat exchanger. To protect against the formation of

frost, a temperature sensor is installed to measure

the temperature of the air leaving the plates in the

exhaust airstream. There are three different methods

of frost control that may optionally be used. These

options are installed, wired and pre-set at the factory.

To identify specific components, see the included

unit-specific schematic wiring diagram.

Plate (cube) bypass. The plate bypass frost control

function is essentially the same as Economizer

mode (see below) except that it is initiated by

temperature sensors for the purpose of frost removal

or prevention.

1. Timed Exhaust frost control

The supply blower cycles on and off based on a

factory provided and installed timer. The timer is

located on the right hand side (low voltage side)

of the control module.

Electric preheat frost control includes an electric

heater at the outdoor air intake, an airflow pressure

switch and a temperature sensor. See also Electric

Heater Application / Operation. When electric preheat

frost control is initiated, the electric preheater will

turn on and warm the incoming air to prevent frost

accumulation on the cube.

2. Plate heat exchanger bypass – Open/Closed

When the exhaust air leaving the exchanger

(cube) drops below the adjustable set-point, both

the face and bypass dampers will allow air to

bypass the cube. This allows warm exhaust air

to melt any frost on the cube. Once the exhaust

air temperature rises above the set-point, the unit

returns to normal operation.

Economizer Application/Operation

Under certain conditions, the most efficient use of

the PVe Heat Recovery Ventilator includes bypassing

the incoming outdoor air around the plate heat

exchanger. When cooling air is being called for and

the outdoor air temperature is below a pre-set point,

the PVe will switch to Economizer Mode. Integral

face and bypass dampers will cycle into a bypass

condition, allowing incoming cool air to flow past

the cube, rather than flow through it. Economizer

Mode is strictly temperature initiated and dependent

on the Temperature Sensor with override located in

the control center. See component #7 on the Typical

Control Center Components illustration.

3. Electric preheat frost control

An electric preheater can optionally be built into

the outdoor air intake. When the temperature

of the exhaust air leaving the plate unit (the

cube) drops below the adjustable set-point, the

preheater will switch on. Once the exhaust air

temperature increases, the preheater will switch

off.

Frost Threshold Temperatures

Indoor RH @ 70°F

Frost Threshold Temp

20%

30%

40%

-5º F

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 for wiring details). The following explains

the three options in more detail.

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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.

R+ R- S+ S- IG

P1 P2 PC A1 A2 +V AC AM AC MP

S1 S2 S3 S4 S5 S6 S7 HC SC H1 RP MA MB MC

S1 S2 S3 S4 S5 SC A1 +V AC AM AC

MA MB MC

J1000

V1000

Factory Set Points

Variable Frequency Drives (VFDs) for the blowers are

factory setup to operate in one of the three following

modes:

OPTION 1 - 0-10 VDC CONTROL

USER TO PROVIDE ISOLATION AS REQUIRED

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

others varies the speed of the blower between 30

and 60Hz

0-10 VDC CONTROL SIGNAL (BY OTHERS)

WIRED TO A1 (+) AND AC (COMMON)

0 VDC=30 Hz

A1 AC

10 VDC=60 Hz

Multispeed: Digital contact closures by others

command the VFD to run at multiple speed settings:

• SC to S4 - Drive runs at 40Hz

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

SEE VFD INSTALLATION MANUAL FOR MORE DETAIL

• SC to S5 - Drive runs at 30Hz

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

CO Sensor: A digital contact closure from an

optional factory provided CO sensor sends the

VFD to high or low speed depending on CO ppm

OPTION 2 - MULTI SPEED CONTROL

levels at the sensor.

USER TO PROVIDE CONTACTS AND ISOLATION

AS REQUIRED

The terminal locations for Modulating (option 1) and

Multispeed (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”.

NEITHER S4 OR S5 CONTACT CLOSED

S4 S5 SC

DRIVE SPEED = 60 Hz.

S4 TO SC CONTACT CLOSED (BY OTHERS)

DRIVE SPEED = 40 Hz.

S5 TO SC CONTACT CLOSED (BY OTHERS)

DRIVE SPEED = 30 Hz.

SEE VFD INSTALLATION MANUAL FOR MORE DETAIL

TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.

PARAMETER A1-01 CHANGE TO 2

PARAMETER d1-01 FOR NEW 60Hz SETTING

PARAMETER d1-02 FOR NEW 40Hz SETTING

PARAMETER d1-03 FOR NEW 30Hz SETTING

PARAMETER A1-01 CHANGE TO 0

Drive Operation

SC to S1 contact for On/Off

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

from +V

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Factory Set Points - continued

CO SENSOR CONTROL FOR FAN SPEED

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.

(1/2 SPEED WHEN C0 DROPS bELOW 700 PPM)

(FULL SPEED WHEN C0 RISES AbOVE 800 PPM)

Setting

Parameter

V1000

J1000

A1-01

Access Level

b1-01 Reference Source (Frequency)

b1-17

C1-01

C1-02

C6-02

d1-01

d1-02

d2-02

VFD Start-Up Setting

Acceleration Time

Deceleration Time

Carrier Frequency

30 sec. 30 sec.

MODULATING CONTROL FOR FAN SPEED

(0-10 VDC)

Setting

Parameter

Frequency Reference 1

Frequency Reference 2

Ref Lower Limit

60 Hz

30 Hz

50%

30 Hz

60 Hz

50%

V1000

J1000

A1-01

b1-17

C1-01

C1-02

C6-02

d2-02

Access Level

VFD Start-Up Setting

Acceleration Time

Deceleration Time

Carrier Frequency

Ref Lower Limit

Motor

FLA

Motor

FLA

30 sec. 30 sec.

E2-01

Motor Rated FLA

H3-10

A1-01

A2 Not Used

Access Level

50%

Motor

FLA

50%

Motor

FLA

E2-01

Motor Rated FLA

H3-04

A1-01

Terminal A1 Bias

Access Level

50%

MULTISPEED CONTROL FOR FAN SPEED

(1/3 OR 1/2 SPEED REDUCTION)

Setting

Parameter

V1000

J1000

A1-01

Access Level

b1-01 Reference Source (Frequency)

b1-17

C1-01

C1-02

C6-02

d1-01

d1-02

d1-03

d1-04

d2-02

VFD Start-Up Setting

Acceleration Time

30 sec. 30 sec.

Deceleration Time

Carrier Frequency

Frequency Reference 1

Frequency Reference 2

Frequency Reference 3

Frequency Reference 4

Ref Lower Limit

60 Hz

40 Hz

30 Hz

60 Hz

50%

60 Hz

40 Hz

30 Hz

60 Hz

50%

Motor

FLA

Motor

FLA

E2-01

H1-04

H1-05

H1-06

Motor Rated FLA

Multfunction Input Sel 4

(Terminal S4)

Multifunction Input Sel 5

(Terminal S5)

Multifunction Input Sel 6

(Terminal S6)

H3-10

A1-01

A2 Not Used

Access Level

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Typical Wiring Diagram

Following is an example of a typical wiring diagram for the PVe. It is representative of circuitry that may be

found in any PVe unit, but it is not intended to be unit-specific. Each PVe unit has a detailed wiring diagram

located within the control panel. This diagram illustrates typical factory wiring and also illustrates circuits that

must be field wired. Included with this drawing are 1) variable frequency drives on the blowers, 2) outdoor

air and exhaust air dirty filter switches, 3) motorized outdoor air and exhaust air intake dampers, 4) electric

preheater, and 5) timed exhaust frost control. Many other factory installed and wired accessories are available.

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Dirty Filter Sensor

CO 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.

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 CO 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.

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.

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.

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).

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.

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)

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Indicator Lights powered by the ER Unit

Remote Control Panel and Wiring

Schematics

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

Unit On/Off

Frost Control

Economizer

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

PS2

Supply Dirty Filter

Exhaust Dirty Filter

PS3

• Frost control light

• Exhaust air dirty ﬁlter light

• Outdoor air dirty ﬁlter light

Refer to Electrical Connections section for Field Control

Wiring recommendations.

Dirty Filter Indicator (power by others)

7-Day Timer or On/Off Switch

PS2

Supply Dirty Filter

Exhaust Dirty Filter

7-Day Timer

PS3

Terminal Block

in Unit

Control Center

S1 - Unit On/Off

Hot

Refer to Pressure Switch for voltage and load ratings.

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

Red wires should be capped off.

Hand/Off/Auto Switch

Terminal Block

in unit

Control Center

Off

Auto

BMS

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.

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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.

OAF-P

EAP

EF-A

OAI

FILTER

FROM

OUTSIDE

EXHAUST

BLOWER

PLATE

HEAT

RAF-P

EXCHANGER

RAI

OAAP

OAF-A

FILTER

FROM

INSIDE

SUPPLY

BLOWER

OAD

Temperature Sensors - 1K Ohm RTD

Drawing

Labels

OAI

Terminal Strip Labels

OA/Supply Inlet Temp

OA After Plate Temp

OAAP

RAI

RA/Exhaust Inlet Temp

Exhaust After Plate Temp

Supply Discharge Temp

EAP

OAD

Pressure Sensors (analog or digital)

Drawing

Labels

OAF-P

Terminal Strip Labels

OA Supply Filter Pressure

RA Exhaust Filter Pressure

RAF-P

EP-P

(2 sensors)

Exhaust Plate Pressure

OAP-P

(2 sensors)

Outdoor Air Plate Pressure

Amp - Current Sensors (analog or digital)

Drawing

Terminal Strip Labels

Labels

EF-A

Exhaust Fan Amps

Supply Fan Amps

OAF-A

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o Rotate the fan wheels by hand and ensure no parts

are rubbing. If rubbing occurs, refer to Start-Up

section for more information.

Start-Up

DANGER

o Check the fan belt drives for proper alignment

and tension (refer to Start-Up section for more

information).

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.

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).

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.

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

Do not operate energy recovery ventilator without

the filters and birdscreens installed. They prevent

the entry of foreign objects such as leaves, birds,

etc.

Connections section).

o Install exhaust inlet motorized damper (see Unit

Accessories section)

SPECIAL TOOLS REQUIRED

CAUTION

Do not run unit during construction phase. Damage

to internal components may result and void

warranty.

• Voltage Meter (with wire probes)

• Amperage Meter

• Thermometer

• Tachometer

• Incline manometer or equivalent

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.

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

Unit Model Number _______________________________

• Supply Fan

• Exhaust Fan

(e.g. PVe-20)

_______ L1 amps

_______ L2 amps

_______ L3 amps

______ L1 amps

______ L2 amps

______ L3 amps

Unit Serial Number _______________________________

(e.g. 10111000)

Start-Up Date

_______________________________

Fan RPM

Start-Up Personnel Name__________________________

Start-Up Company _______________________________

_______ Supply Fan ______ Exhaust Fan

Correct fan rotation direction

Phone Number

_______________________________

Supply Fan

Exhaust Fan

Yes / No

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.

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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.

Provided with Unit? Frost Control Application / Operation section:

Setting

Factory Default

Yes

Frost Control set point

Differential

35ºF

2ºF

Timer

Refer to IOM

Frost Control Modulating

Economizer Application / Operation section:

Yes

Economizer (temperature)

Set point

65ºF

20ºF

2ºF

Offset

Differential

Yes

Economizer (enthalpy)

Set point

Optional Accessories section:

Operational

Yes

OA Dirty Filter Sensor

EA Dirty Filter Sensor

Yes

N/A

CO Sensor

Service Outlet

Vapor Tight Lights

Remote Control Panel

Variable Frequency Drives section:

Operational

Yes

Blower VFDs

Yes

N/A

Damper section:

Operational

Yes

Outdoor Air Damper

Exhaust Air Damper

Yes

N/A

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5. Place belts over sheaves. Do not pry or force

belts, as this could result in damage to the cords

in the belts.

Unit Start-Up

Refer to Parts List section for component locations.

Fans

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.

The PVe 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.

Forward Curved

Exhaust Fan

WRONG

CORRECT

CAUTION

Direction of Fan Wheel Rotation

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.

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 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.

Airﬂow

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:

Forward Curved

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.

• Fan Shaft

• Fan Wheel

• Bearings

• Belt

• 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

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.

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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.

Wheel Unbalance

Refer to the

Drive Pulley Misalignment

Incorrect Belt Tension

Bearing Misalignment

Mechanical Looseness

Faulty Belts

Drive Component Unbalance

Poor Inlet/Outlet Conditions

Foundation Stiffness

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.

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Maintenance Overview

The Greenheck PVe Heat Recovery Ventilator is quite

simply an interface unit that takes in outdoor air and

either heats or cools that air and then delivers that air

into the building HVAC system for further heating or

cooling. The heating and cooling that is done in this

unit is accomplished by taking heat energy out of the

air being exhausted to the outdoors and transferring

that heat energy to the incoming replacement air. If

the outdoor air is being used for cooling, some of the

heat energy is transferred from the incoming warm

outdoor air to the exhaust air.

Most all the components found in this unit are typical

of what would normally be found in other air handlers.

There is an air propulsion system consisting of

two belt driven blowers; one to draw in outdoor air

through the Plate Heat Exchanger, and the other to

draw stale indoor air from the building through the

Plate Heat Exchanger and then exhaust it. There are

various optional motorized dampers and sensors that

may also be found in the unit.

The heart of the PVe unit is the Plate Heat Exchanger

and this is the component that actually accomplishes

heat energy recovery. It has no moving parts and the

only real maintenance issues are to keep the internal

surfaces clean and to protect the aluminum plates

from damage.

In addition to the typical maintenance issues shown

in following pages, periodic visual inspection of

the Plate Heat Exchanger is required. Such visual

inspections should be recorded and record made of

any observations.

The surfaces of the flat aluminum plates within

the Plate Heat Exchanger permit complete visual

inspection of both supply and exhaust sides of the

unit. Small amounts of dust present in either side of

the Plate Heat Exchanger will not affect performance.

If appreciable amounts of dust or dirt accumulate,

the Plate Heat Exchanger can be cleaned with hot

water (180ºF) or a detergent that does not damage

aluminum surfaces. Spray water evenly across the

surfaces at a pressure between 22 and 55 psig. Do

not force sharp objects against the heat transfer

surfaces or damage to the flat plates may occur.

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Fan Belts

Routine Maintenance

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.

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.

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.

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:

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

Apply lubrication where required

Dampers

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 halfway between

sheave centers). For example, if the belt span is

64 inches, the belt deflection should be one inch

Check for unobstructed operation

Fan Belts

Check for wear, tension, alignment

Motors

Check for cleanliness

(using moderate thumb

pressure at mid-point

of the drive). Check

belt tension two times

during the first 24 hours

of operation and

Belt Span

Blower Wheel & Fasteners

Check for cleanliness

Deflection =

Check all fasteners for tightness

Check for fatigue, corrosion, wear

Bearings

Check for cleanliness

Check set screws for tightness

Lubricate as required

periodically thereafter.

Belt Span

Fan Motors

External Filter

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

Check for cleanliness - clean if required

Internal Filter

Check for cleanliness - replace if required

Door Seal

with high pressure spray.

Greasing of motors is

Check if intact and pliable

only intended when

fittings are provided.

Many fractional motors

are permanently

lubricated for life and

require no further

lubrication.

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.

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.

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Fan Wheel & Fasteners

Filter Size and Quantities

Pleated Filter Size

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.

Quantity

Supply Exhaust

Unit Size

Supply and Exhaust

12 x 25 x 2

PVe-20

PVe-35

PVe-45

PVe-55

16 x 25 x 2

20 x 25 x 2

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.

24 x 24 x 2

All dimensions in inches.

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.

Bearings

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.

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 relubricatable

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.

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.

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 PVe 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 .

Model PVe Heat Recovery Unit

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Parts List

Sequence of Operation

Basic Unit

The PVe 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 and

exhaust fan are energized and optional motorized

dampers open. The PVe 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 PVe.

Summer Operation

Outdoor air is preconditioned (temperature is

decreased) by the transfer of energy from the cooler,

drier, exhaust air via the aluminum heat exchanger.

The preconditioned air is typically mixed with return

air going back to the air handler for final conditioning.

1. Supply blower

Economizer Operation: Refer to Economizer

Application/Operation section.

• Forward curved fan

• Adjustable motor mount for belt tensioning

• Adjustable sheaves for speed control

Winter Operation

Outdoor air is preconditioned (temperature is

increased) by the transfer of energy from the warmer,

more humid exhaust air via the aluminum heat

exchanger. The preconditioned air is typically mixed

with return air going back to the air handler for final

conditioning.

2. Vibration isolators (quantity 4 per blower)

• Neoprene

3. Aluminum plate heat exchanger

4. Supply weatherhood with 2-inch aluminum mesh

filter

Frost Control Operation: Refer to Frost Control

Application/Operation section.

5. Exhaust weatherhood with birdscreen

6. Supply and exhaust air filter racks for

2-inch pleated, 30% efficient filters

Other Accessories:

Dirty Filter Sensor: Refer to Optional Accessories

section

7. Electrical control box (standard features)

• Single point power

CO Sensor: Refer to Optional Accessories section

• Disconnect interlocked with access door

• Motor starters for the supply and exhaust

blower

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 CO sensors to monitor space CO

• 24 VAC, control circuit with terminal strip

Not depicted on this image

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

8. Exhaust blower

operate the blowers at minimum airflow required by

• Forward curved fan

• Adjustable motor mount for belt tensioning

• Adjustable sheaves for speed control

code. As the space occupancy increases and CO

levels increase, the VFD will increase the amount

of fresh outdoor air being brought in to offset the

CO levels in the space (exhaust airflow is increased

proportionally as outdoor airflow increases). As CO

levels come back down, the airflow will decrease

back to minimum requirements.

Model PVe Heat Recovery Unit

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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:

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

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

accordance with SMACNA and AMCA guidelines.

Model PVe Heat Recovery Unit

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Troubleshooting – Unit

Symptom

Possible Cause

Corrective Action

Replace fuse or reset circuit breaker and check

amps.

Blown fuse or open circuit breaker.

Defective motor or capacitor.

Motor starter overloaded.

Replace.

Blower fails to

Reset starter and check amps.

operate

Check for On/Off switches. Check for correct

supply voltage.

Electrical.

Drive.

Check for broken or loose belts. Tighten loose

pulleys.

Shorten wiring run to mechanical room or

install a relay which will turn unit on/off. Consult

Factory for relay information.

Control power (24 VAC) wiring run is too long

(resistance should not exceed 0.75 ohms).

Motor starters

“chatter” or

do not pull in

Incoming supply power is less than anticipated.

Voltage supplied to starter coil must be within

Need to increase supply power or use a special

control transformer which is sized for the actual

+10% / -15% of nominal voltage stated on the coil. supply power.

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.

Motor voltage incorrect.

Check rotation and reverse if necessary.

Motor over amps

Check motor nameplate versus supplied

voltage.

See specifications and catalog for fan curves to

determine if horsepower is sufficient.

Motor horsepower too low.

Shorted windings in motor.

Unit damper not fully open.

Replace motor.

Adjust damper linkage or replace damper motor.

Improve ductwork to eliminate losses using

good duct practices.

System static pressure too high.

Blower speed too low.

Check for correct drives and rpm with catalog

data.

For 3-phase, see Direction of Fan Wheel

Rotation under Unit Start-Up section.

Fan wheels are operating backwards.

Low airflow (cfm)

Follow cleaning procedures in Routine

Maintenance section.

Dirty filter.

Leaks in ductwork.

Repair.

Elbows or other obstructions may be

obstructing fan outlet.

Correct or improve ductwork.

Adjust belt tension.

Belt slippage.

Check for correct fan rpm. Decrease fan speed

if necessary.

Blower fan speed too high.

Filter(s) not in place.

Install filters.

High airflow (cfm)

Induce Ps into system ductwork. Make sure

grilles and access doors are installed. Decrease

fan speed if necessary.

Insufficient static pressure (Ps) (airflow

resistance).

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

service information.

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Troubleshooting – Unit

Symptom

Possible Cause

Corrective Action

One or both

blowers turn off

intermittently and

back on after

Adjust frost temperature sensor set point as

needed.

Exhaust Only frost control sensors are tripping.

about 2 minutes

Adjust wheel and/or inlet cone. Tighten wheel

hub or bearing collars on shaft.

Fan wheel rubbing on inlet.

Bearings.

Replace defective bearing(s). Lubricate

bearings. Tighten collars and fasteners.

Wheel out of balance.

Loose wheel on shaft.

Loose motor or blower sheave.

Belts too loose.

Replace or rebalance.

Tighten wheel setscrew.

Tighten sheave setscrew.

Adjust belt tension after 24 hours of operation.

Excessive noise

or vibration

Loosen to maintain a 3/8 inch deflection per

foot of span between sheaves.

Belts too tight.

Worn belt.

Replace.

Motor base or blower loose.

Buildup of material on wheel.

Bearing and drive misaligned.

Tighten mounting bolts.

Clean wheel and housing.

Realign.

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.

Noise being transmitted by duct.

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

service information.

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Maintenance Log

Date __________________ Time _____________ AM/PM