Greenheck Fan PVE-20, PVE-45, PVE-35 User Manual

0 (0)

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.

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.

1 Model PVe Heat Recovery Unit

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.

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.

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 provided lifting points or fork lifting points (see page 4). Handle each piece in such a way 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.

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.

2 Model PVe Heat Recovery Unit

Table of Contents

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

 

 

 

 

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

Drain Trap . . . . . . . . . . . . . . . 8

Electrical Information

 

 

 

 

General Electrical Information

 

 

 

9

Control Center Components . . . . . .

.

. 10

Electric Heater Application/Operation . .

.

. 10

Optional Accessories

 

 

 

 

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

 

 

 

 

Start-Up

 

 

 

 

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

Basic Operation

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.

OUTDOOR

AIR

SIDE VIEW

RETURN DUCT

SUPPLY DUCT

Supplemental Installation,

Operation and Maintenance

Manuals

Refer to the following Installation, Operation and Maintenance Manuals for additional details:

Part #462844 — Exhaust Weatherhood

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.

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.

Model PVe Heat Recovery Unit 3

Installation Stages

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.

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.

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.

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.

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.

4 Model PVe Heat Recovery Unit

Lifting

Forklift lifting

points

Crane hoisting points (typical)

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 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

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 the unit and setting on the curb.

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.

Unit Weights (lbs.)

Model Approx.

Weight

PVe-20 1300

PVe-35 1600

PVe-45 2100

PVe-55 2700

Lifting with a Forklift

Unit base rail includes forklift lifting locations. Use weights shown to determine forklift size requirements.

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

Bottom

 

Top

 

 

 

Side

 

End

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OA Intake

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SA Discharge

X

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RA Intake

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EA Discharge

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OA - Outdoor Air

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SA - Supply Air (to the space)

 

 

 

 

 

 

 

 

 

RA - Return Air (from the space)

 

 

 

 

 

 

 

 

 

EA - Exhaust Air

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

EA Discharge

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SA Discharge

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SA Discharge

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OA Intake

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F

 

 

 

 

 

 

 

 

 

 

 

 

 

RA Intake

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Duct Dimensions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model

 

 

 

A

B

 

 

C

 

D

 

E

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PVe-20

 

10.7

 

12.2

 

 

10.3

 

11.8

 

22.0

14.0

 

 

(280)

 

(310)

 

 

(270)

 

(300)

 

(570)

(360)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PVe-35

 

11.9

 

13.7

 

 

11.4

 

13.1

 

34.0

14.0

 

 

(310)

 

(350)

 

 

(290)

 

(340)

 

(870)

(360)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PVe-45

 

14.1

 

16.0

 

 

13.3

 

14.5

 

46.0

14.0

 

 

(360)

 

(410)

 

 

(340)

 

(370)

 

(1170)

(360)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PVe-55

 

16.4

 

19.2

 

 

15.9

 

18.6

 

60.0

14.0

 

 

(420)

 

(490)

 

 

(450)

 

(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.

Service Clearances

 

B

CLEARANCE

C

 

 

 

CLEARANCE

 

 

 

A

 

D

 

 

D

 

 

Model

A

B

C

D

 

 

 

 

 

PVe-20

36

36

36

60

(920)

(920)

(920)

(1530)

 

 

 

 

 

 

PVe-35

48

36

36

60

(1220)

(920)

(920)

(1530)

 

 

 

 

 

 

PVe-45

60

36

36

60

(1530)

(920)

(920)

(1530)

 

 

 

 

 

 

PVe-55

72

36

36

60

(1830)

(920)

(920)

(1530)

 

 

 

 

 

 

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.

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.

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.

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.

Model PVe Heat Recovery Unit 5

Roof Curb Mounting

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.

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.

Unit Side

1.895

Unit Base

 

Insulation Pan

4.844

Roof Curb

1.549

0.775

Dimensions are shown in inches.

Curb Cap Details for Factory Supplied Roof Curbs

6 Model PVe Heat Recovery Unit

Curb Dimensions and Weights

L

W

Unit Size

L

W

Curb Weight

(lbs.)

 

 

 

 

 

 

 

PVe-20

99.4

36.8

195

 

 

 

 

PVe-35

99.4

44.6

216

 

 

 

 

PVe-45

105.9

56.3

261

 

 

 

 

PVe-55

111.7

71.3

316

 

 

 

 

All dimensions are shown in inches.

Ductwork Connections

Examples of poor and good 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

 

 

 

tion

 

 

a

 

t

 

R

o

 

 

result in low

 

 

 

 

 

 

 

airflow and other

 

 

 

 

system effects.

 

 

 

 

 

 

 

tion

 

 

a

 

t

 

R

o

 

 

 

 

 

POOR

Length of Straight Duct

GOOD

Recommended Discharge Duct Size and Length

Unit Size

Blower Size

Duct Size

Straight Duct Length

 

 

 

 

PVe-20

9

14 x 14

36

 

 

 

 

PVe-35

10

20 x 20

36

 

 

 

 

PVe-45

12

20 x 20

36

 

 

 

 

PVe-55

15

28 x 28

60

 

 

 

 

All dimensions are 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.

Greenheck Fan PVE-20, PVE-45, PVE-35 User Manual

Rail Mounting / Layout

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.

Access Panel Description and

Location

5

4

3

2

1

Filters

1Optional OA Damper Optional RA Damper

Optional Face and Bypass Dampers

2Plate Heat Exchanger Optional Preheater

3Plate Heat Exchanger

4Control Center

5Blowers

Isometric view of

PVe on rails

A

B

C

D

Side view of

PVe on rails

Unit Size

A

B*

C*

D

 

 

 

 

 

PVe-20

5

14

13.25

7.75

 

 

 

 

 

PVe-35

5

14

12.00

6.50

 

 

 

 

 

PVe-45

5

14

15.50

10.5

 

 

 

 

 

PVe-55

5

14

18.75

13.25

 

 

 

 

 

All dimensions are shown in inches.

*Zones B and C identify regions/zones where rails may not be place due to ductwork.

Model PVe Heat Recovery Unit 7

Dimensional Data

Exhaust

Air Hood

 

 

 

 

Bypass

 

Hood

Filters

 

 

Damper

 

 

 

 

 

 

 

 

 

 

 

 

 

OutdoorAir

 

 

Face

Plate Heat

 

 

 

 

 

 

 

 

Damper

Exchanger

 

 

 

 

 

 

Control Center

Top view

D

 

 

A

 

Filters

Face/Bypass

Damper

Outdoor

 

Air Hood

 

Plate Heat

 

 

 

 

 

 

 

 

Exchanger

 

Filters

 

 

Side view

E

C

B

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.

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.

4 in.

2 in.

Unit

A

B

C

D

E

Size

 

 

 

 

 

 

 

 

 

 

 

PVe-20

104.1

59.7

41.5

20.3

20.7

(2650)

(1520)

(1060)

(520)

(530)

 

 

 

 

 

 

 

PVe-35

104.1

59.7

49.2

25.2

17.7

(2650)

(1520)

(1250)

(640)

(450)

 

 

 

 

 

 

 

PVe-45

110.6

59.7

61.1

25.2

19.0

(2810)

(1520)

(1560)

(640)

(490)

 

 

 

 

 

 

 

PVe-55

116.5

59.7

76.1

25.2

23.8

(2959)

(1520)

(1940)

(640)

(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).

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.

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.

8 Model PVe Heat 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 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 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.

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.

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 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

CAUTION

If any of the original wire as supplied with the appliance must be replaced, it must be replaced with wiring material having a temperature rating of at least 105ºC.

WARNING

To prevent injury or death due to electrocution or contact with moving parts, lock disconnect switch open.

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.

Field Control Wiring Length/Gauge

Total

Minimum

Wire Length

Wire Gauge

125 ft.

18

200 ft.

16

300 ft.

14

450 ft.

12

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 industrialstyle, 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.

Model PVe Heat Recovery Unit 9

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)

8. Dirty Filter Sensor

9. Dirty Filter Sensor

1 5

6

4

7

2

3

8

9

 

 

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

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.

10 Model PVe Heat Recovery Unit

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