Greenheck PVe User Manual

Document 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.

Model PVe

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. 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.

Model PVe Heat Recovery Unit

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 reported to the Traffic Department. If damaged upon arrival, file claim with carrier. Any physical damage to the unit after acceptance is not the responsibility of manufacturer.

Unpacking

Verify that all required parts and the correct quantity of each item have been received. If any items are missing, report shortages to your local representative to arrange for obtaining missing parts. Sometimes it is not possible that all items for the unit be shipped together due to availability of transportation and truck space. Confirmation of shipment(s) must be limited to only items on the bill of lading.

Handling

Units are to be rigged and moved by the lifting brackets provided or by the skid when a forklift is used. Location of brackets varies by model and size. Handle in such a manner as to keep from scratching or chipping the coating. Damaged finish may reduce ability of 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.

INDOOR — The ideal environment for the storage of

units and accessories is indoors, above grade, in a low humidity atmosphere which is sealed to prevent the entry of blowing dust, rain, or snow. Temperatures should be evenly maintained between 30°F (-1°C) and 110°F (43°C) (wide temperature swings may cause condensation and “sweating” of metal parts). All accessories must be stored indoors in a clean, dry atmosphere.

Remove any accumulations of dirt, water, ice, or snow and wipe dry before moving to indoor storage. To avoid “sweating” of metal parts allow cold parts to reach room temperature. To dry parts and packages use a portable electric heater to get rid of any moisture build up. Leave coverings loose to permit air circulation and to allow for periodic inspection.

The unit should be stored at least 3½ in. (89 mm) off the floor on wooden blocks covered with moisture proof paper or polyethylene sheathing. Aisles between parts and along all walls should be provided to permit air circulation and space for inspection.

OUTDOOR — Units designed for outdoor applications

may be stored outdoors, if absolutely necessary. Roads or aisles for portable cranes and hauling equipment are needed.

The fan should be placed on a level surface to prevent water from leaking into the unit. The unit should be elevated on an adequate number of wooden blocks so that it is above water and snow levels and has enough blocking to prevent it from settling into soft ground. Locate parts far enough apart to permit air circulation, sunlight, and space for periodic inspection. To minimize water accumulation, place all unit parts on blocking supports so that rain water will run off.

Do not cover parts with plastic film or tarps as these cause condensation of moisture from the air passing through heating and cooling cycles.

Inspection and Maintenance during Storage

While in storage, inspect fans 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 the fan wheel by hand ten to fifteen revolutions to distribute lubricant on motor. Every three months, the fan motor should be energized. If paint deterioration begins, consideration should be given to touch-up or repainting. Fans 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 lintfree 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 thoroughly clean 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

REMOVING FROM STORAGE — As units are removed

from storage to be installed in their final location, they should be protected and maintained in a similar fashion, until the equipment goes into operation.

Prior to installing the unit and system components, inspect the unit assembly to make sure it is in working order.

1. Check all fasteners, set screws on the fan, wheel,

2. Rotate the fan wheel(s) by hand and assure no parts

® or the equivalent.

bearings, drive, motor base, and accessories for tightness.

are rubbing.

Model PVe Heat Recovery Unit

OUTDOOR

Table of Contents

Product Overview

Product Overview . . . . . . . . . . . . . 3

Installation

Unit Dimensions and Weights . . . . . . . . 4

Access Panel Description and Locations . . . 4

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

Handling . . . . . . . . . . . . . . . . . 5

Lifting . . . . . . . . . . . . . . . . . . 5

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

Curb Outside Dimensions and Weights . . . . 6

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

Ductwork Connections . . . . . . . . . . . 7

Electrical Installation

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

Field-Provided Disconnect . . . . . . . . . 9

Discharge Air Temperature Sensor . . . . . . 9

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

Optional Accessory Wiring Schematics . . . . 10

Piping Installation

Condensate Drain Trap . . . . . . . . . . . 11

Unit Overview . . . . . . . . . . . . . . . 11

Optional Component Overview

Economizer . . . . . . . . . . . . . . . 12

Frost Control . . . . . . . . . . . . . . . 12

Variable Frequency Drives . . . . . . . . . 12

Sensor . . . . . . . . . . . . . . . 12

Dirty Filter Sensor . . . . . . . . . . . . . 12

Service Outlet . . . . . . . . . . . . . . 12

Vapor Tight Lights . . . . . . . . . . . . . 12

Unit Start-Up

General . . . . . . . . . . . . . . . . . 13

Special Tools Required . . . . . . . . . . . 13

Start-Up Procedure . . . . . . . . . . . . 13

Voltage Imbalance . . . . . . . . . . . . . 13

Pre Start-Up Checklist . . . . . . . . . . . 13

Start-Up Checklist. . . . . . . . . . . . . 14

Optional Accessories Checklist . . . . . . . 14

Start-Up Components

Fans . . . . . . . . . . . . . . . . . . 15

Vibrations . . . . . . . . . . . . . . . .16

Optional Start-Up Components

Dirty Filter Switch . . . . . . . . . . . . . 16

Frost Control . . . . . . . . . . . . . . . 16

Variable Frequency Drives . . . . . . . . 17-18

Routine Maintenance Checklist

Overview. . . . . . . . . . . . . . . . . 19

General . . . . . . . . . . . . . . . . . 19

Procedures. . . . . . . . . . . . . . 20-21

Parts List . . . . . . . . . . . . . . . . . 21

Troubleshooting

Airﬂow. . . . . . . . . . . . . . . . . . 22

Unit . . . . . . . . . . . . . . . . . . . 23

Maintenance Log . . . . . . . . . Backcover

Our Commitment . . . . . . . . . Backcover

The unit 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.

AIR

SIDE VIEW

RETURN DUCT

SUPPLY DUCT

Model PVe Heat Recovery Unit

Installation

Unit Dimensions and Weights

Bypass Damper

Outdoor Air Hood

Face

Filters

Damper

FiltersFilters

Face/Bypass Damper

Plate Heat Exchanger

Top view

Plate Heat

Exchanger

Exhaust Air Hood

Control Center

Access Panel Description and Location

Filters

Optional OA (Outdoor Air) Damper Optional RA (Return Air) Damper

Optional Face and Bypass Dampers Plate Heat Exchanger

Side view

Approx.

Unit Size A B C D E

Weight

PVe-20 104.1 59.7 41.5 20.3 20.7 1300

PVe-35 104.1 59.7 49.2 25.2 17.7 1600

PVe-45 110.6 59.7 61.1 25.2 19.0 2100

PVe-55 116.5 59.7 76.1 25.2 23.8 2700

All dimensions are shown in inches.

(lbs.)

Plate Heat Exchanger

Control Center

Blowers

Model PVe Heat Recovery Unit

Service Clearances

CLEARANCE

Unit Size A B C D

PVe-20 36 36 36 60

PVe-35 48 36 36 60

PVe-45 60 36 36 60

PVe-55 72 36 36 60

All dimensions are shown in inches. 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.

Lifting

WARNING

All factory-provided lifting lugs must be used when lifting the units. Failure to comply with this safety precaution could result in property damage, serious injury, or death.

1. Before lifting, be sure that all shipping material has been removed from unit.

2. To assist in determining rigging requirements, weights are provided in the Installation, Unit Dimensions and Weights section of this manual.

3. Unit must be lifted by all lifting lugs provided on base structure.

4. Rigger to use suitable mating hardware to attach to unit lifting lugs.

5. Spreader bar(s) must span the unit to prevent damage to the cabinet by the lift cables.

Handling

While this unit was constructed with quality and dependability in mind, damage still may occur during handling of the unit for installation. Exercise extreme caution to prevent any damage from occurring to the refrigerant system. This unit could contain a system pressurized with refrigerant that, if damaged, could leak into the atmosphere or cause bodily harm due to the extreme cold nature of expanding refrigerant. Use protective equipment such as gloves and safety glasses to minimize or prevent injury in case of a system leak during installation.

The system design and installation should follow accepted industry practice, such as described in the ASHRAE Handbook. Adequate space should be left around the unit for piping coils and drains, filter replacement, and maintenance. Sufficient space should be provided on the side of the unit for routine service and component removal should that become necessary.

6. Always test-lift the unit to check for proper balance and rigging before hoisting to desired location.

7. Never lift units by weatherhoods.

8. Never lift units in windy conditions.

9. Preparation of curb and roof openings should be completed prior to lifting unit to the roof.

10. Check to be sure that gasketing (supplied by others) has been applied to the curb prior to lifting the unit and setting on curb.

Lifting with a Forklift

Unit base rail includes forklift lifting locations. Use weights in the Installation, Unit Dimensions and Weights section of this manual to determine forklift size requirements.

Model PVe Heat Recovery Unit

Rooftop 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.

Position the unit roof opening such that the supply discharge and exhaust inlet of the unit will line up with the corresponding ductwork. Be sure to allow for the recommended service clearances when positioning opening.

Do not face the outdoor air intake of the unit into prevailing wind and keep the intake away from any other exhaust fans. Likewise, position the exhaust discharge opening away from outdoor air intakes of any other equipment.

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 recheck 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 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 unit. Verify that the unit is properly seated on the curb and is level.

Curb Outside Dimensions and WeightsRoof Curb Mounting

Unit Size L W

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.

Unit Side

1.895

4.844

Roof Curb

1.549

0.775

Dimensions are shown in inches.

Curb Cap Details for Factory Supplied Roof Curbs

Unit Base

Insulation Pan

Curb Weight

(lbs.)

Model PVe Heat Recovery Unit

Rail Mounting / Layout

POOR

1. Rails designed to handle the weight of the unit should be positioned as shown on the diagram (rails by others).

2. Make sure that rail positioning does not interfere with the supply air discharge opening or the exhaust air intake opening on the unit. Avoid areas dimensioned “B or C” below.

3. Rails should run the width of the unit and extend beyond the unit a minimum of 12 inches on each side.

4. Set unit on rails.

Isometric view of unit on rails

Ductwork Connections

Examples of poor and good fanto-duct connections are shown. Airflow out of the fan should be directed straight or curve the same direction as the fan wheel rotates. Poor duct installation will result in low airflow and other system effects.

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.

Length of Straight Duct

GOOD

A B

Side view of unit 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

Electrical Installation

WARNING

The roof lining contains high voltage wiring. To prevent electrocution, do not puncture the interior or exterior panels of the roof.

WARNING

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

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

IMPORTANT

Before connecting power to the unit, read and understand the following instructions and wiring diagrams. Complete wiring diagrams are attached on the inside of the control center door(s).

IMPORTANT

All wiring should be done in accordance with the latest edition of the National Electrical Code ANSI/NFPA70 and any local codes that may apply. In Canada, wiring should be done in accordance with the Canadian Electrical Code.

IMPORTANT

The equipment must be properly grounded and bonded. Any wiring running through the unit in the airstream must be protected by metal conduit, metal clad cable or raceways.

CAUTION

If replacement wire is required, it must have a temperature rating of at least 105°C, except for an energy cut-off or sensor lead wire which must be rated to 150°C.

DANGER

High voltage electrical input is needed for this equipment. This work should be performed by a qualified electrician.

CAUTION

Any wiring deviations may result in personal injury or property damage. Manufacturer is not responsible for any damage to, or failure of the unit caused by incorrect final wiring.

1. Determine the Size of the Main Power Lines The unit’s nameplate states the voltage and the unit’s MCA. The main power lines to the unit should be sized accordingly. The nameplate is located on the outside of the unit on the control panel side.

2. Provide the Opening(s) for the Electrical Connections

Electrical openings vary by unit size and arrangement and are ﬁeld-supplied.

3. Connect the Power Supplies Connect the main power lines and electric heater power lines to the disconnect switches or terminal blocks and main grounding lug(s). Torque ﬁeld connections to manufacturer’s recommendations.

4. Wire the Optional Convenience Outlet The convenience outlet requires a separate 115V power supply circuit. The circuit must include short circuit protection which may need to be supplied by others.

5. Connect Field-Wired Low Voltage Components Most factory-supplied electrical components are prewired. To determine what electrical accessories require additional ﬁeld-wiring, refer to the unitspeciﬁc wiring diagram located on the inside of the control center access door.

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. All low voltage wiring should be run in conduit wherever it may be exposed to the weather.

The low voltage control circuit is 24 VAC and

control wiring should not exceed 0.75 ohms. If wire resistance exceeds 0.75 ohms, an isolation 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. 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

Field-Provided Disconnect

If field-installing an additional disconnect switch, it is recommended that there is at least four feet of service room between the switch and system access panels. When providing or replacing fuses in a fusible disconnect, use dual element time delay fuses and size according to the rating plate.

Discharge Air Temperature Sensor

The discharge air temperature sensor is factory-mounted in the blower discharge section of the unit behind the blower cut off plate.

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

2 3

Model PVe Heat Recovery Unit

Optional Accessory Wiring Schematics

The remote panel is a series of interconnected junction boxes with a stainless steel faceplate. The remote panel is available with a number of different alarm lights and switches to control the unit. The remote panel ships loose and requires mounting and wiring in the field

The remote panel is available with the following options:

• Unit on/off switch

• Unit on/off light

• 7-day time clock

• Hand/off/auto switch

• Time delay override

• Economizer light

• Frost control light

• Exhaust air dirty ﬁlter light

• Outdoor air dirty ﬁlter light

Indicator Lights powered by the ER Unit

PS2

PS3

Unit On/Off

Frost Control

Economizer

Supply Dirty Filter

Exhaust Dirty Filter

Refer to Electrical Connections section for Field Control Wiring recommendations.

7-Day Timer or On/Off Switch

7-Day Timer

Terminal Block

S1 - Unit On/Off

in Unit

Control Center

For 7-Day Timer, use blue and black wires. Red wires should be capped off.

Hand/Off/Auto Switch

Dirty Filter Indicator (power by others)

PS2

Hot

PS3

Refer to Pressure Switch for voltage and load ratings.

Supply Dirty Filter

Exhaust Dirty Filter

Terminal Block

Control Center

On 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.

Model PVe Heat Recovery Unit

in unit

Piping Installation

Unit Overview

Condensate Drain Trap

This unit is equipped with a stainless steel condensate pan with a 1-inch MPT stainless steel drain connection. It is important that the drain connection be fitted with a P trap to ensure proper drainage of condensate while maintaining internal static pressures.

A P trap assembly (kit) is supplied with each unit and is to be assembled and installed as local conditions require and according to the assembly instructions provided with the P trap. If local and area codes permit, the condensate may be drained back onto the roof, but a drip pad should be provided beneath the outlet. If local and area codes require a permanent drain line, it should be fabricated and installed in accordance with Best Practices and all codes.

In some climates, it will be necessary to provide freeze protection for the P trap and drain line. The P trap should be kept filled with water or glycol solution at all times and it should be protected from freezing to protect the P trap from damage. If severe weather conditions occur, it may be necessary to fabricate a P trap and drain line of metal and install a heat tape to prevent freezing.

Basic Unit

The 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 unit is normally interlocked (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 unit.

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.

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.

Model PVe Heat Recovery Unit

Optional Component Overview

Economizer

Under certain conditions, the most efficient use of the unit 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 unit 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.

Frost Control

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 two 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.

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.

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.

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.

Plate (cube) bypass. The plate bypass frost control function is essentially the same as economizer mode except that it is initiated by temperature sensors for the purpose of frost removal or prevention.

Variable Frequency Drives (VFD)

Variable frequency drives are used to control the speed of the fan as either multi-speed or modulating control. Multi-speed VFDs reference a contact which can be made by a switch or a sensor with a satisfied set point. Modulating control references a 2-10 VDC signal to the VFD which will vary the fan speed from a minimum 50% to full 100% rpm. An optional CO provide both a set point contact or a modulating 2-10 VDC signal.

sensor is available to

CO2 Sensor

This accessory is often used in Demand Control Ventilation (DCV) applications. The factory-provided sensors can either be set to reference a set point for multi-speed operation, or output a 2-10 VDC signal to modulate the fan speed. These can either be shipped loose to mount in the ductwork, or can be factory-mounted in the return air intake. Follow instructions supplied with sensor for installation and wiring details.

Dirty Filter Sensor

Dirty filter sensors monitor pressure drop across the outdoor air filters, exhaust air filters, or both. If the pressure drop across the filters exceeds the set point, the sensor will close a set of contacts in the unit control center. Field-wiring of a light (or other alarm) to these contacts will notify maintenance personnel when filters need to be replaced. The switch has not been set at the factory due to external system losses that will affect the switch. This switch will need minor field adjustments after the unit has been installed with all ductwork complete. The dirty filter switch is mounted in the exhaust inlet compartment next to the unit control center or in 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.

Vapor Tight Lights

Vapor tight lights provide light to each of the compartments in the energy recovery unit. The lights are wired to a junction box mounted on the outside of the unit. The switch to turn the lights on is located in the unit control center. The switch requires a separate power source to allow for power to the lights when the unit main disconnect is off for servicing.

Model PVe Heat Recovery Unit

Unit Start-Up

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.

CAUTION

Do not operate energy recovery ventilator without the filters and birdscreens installed. They prevent the entry of foreign objects such as leaves, birds, etc.

CAUTION

Do not run unit during construction phase. Damage to internal components may result and void warranty.

Pre Start-Up

Every installation requires a comprehensive start-up to ensure proper operation of the unit. As part of that process, the following checklist must be completed and information recorded. Starting up the unit in accordance with this checklist will not only ensure proper operation, but will also provide valuable information to personnel performing future maintenance. Should an issue arise which requires factory assistance, this completed document will allow unit experts to provide quicker resolve. Qualified personnel should perform start-up to ensure safe and proper practices are followed.

Unit Model Number _______________________________

Unit Serial Number _______________________________

Start-Up Date _______________________________

Start-Up Personnel Name __________________________

Start-Up Company _______________________________

Phone Number _______________________________

(e.g. PVe-20)

(e.g. 10111000)

SPECIAL TOOLS REQUIRED

• Voltage Meter (with wire probes)

• Amperage Meter

• Thermometer

• Tachometer

• Incline manometer or equivalent

Start-Up Procedure

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 and amps, the control center door needs to be open and the unit energized.

• Make sure Pre-Start-Up checklist is complete.

• Jumper R to G to enable unit.

Voltage Imbalance

In a three-phase system, excessive voltage imbalance between phases will cause motors to overheat and eventually fail. Maximum allowable imbalance is 2%. To determine voltage imbalance, use recorded voltage measurements in this formula.

Key: V1, V2, V3 = line voltages as measured VA (average) = (V1 + V2 + V3) / 3 VD = Line voltage (V1, V2 or V3) that deviates farthest from average (VA)

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

Pre Start-Up Checklist

 Disconnect and lock-out all power switches

 Remove any foreign objects that are located in the

energy recovery unit.

 Check all fasteners, set-screws, and locking collars

on the fans, bearings, drives, motor bases and accessories for tightness.

 Rotate the fan wheels by hand and ensure no parts

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

 Check the fan belt drives for proper alignment

and tension (refer to Start-Up section for more information).

 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).

 Verify that non-motorized dampers open and close

properly.

 Check the tightness of all electrical wiring

connections.

 Verify control wire gauge.

Model PVe Heat Recovery Unit

Start-Up Checklist

Line Voltage. Check at unit disconnect.

L1-L2 Volts L2-L3 Volts L1-L3 Volts

Motor Amp Draw

Supply Motor Amps L1 Amps L2 Amps L3 Amps

Exhaust Motor Amps L1 Amps L2 Amps L3 Amps

Fan RPM

Supply Fan RPM Supply Fan Yes / No

Measured Airflow CFM

Exhaust Fan RPM Exhaust Fan Yes / No

Measured Airflow CFM

Correct fan rotation direction?

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.

Frost Control Application / Operation Section: Setting Factory Default

Yes No Frost Control set point 5°F

Differential 2°F

Timer Refer to IOM

Yes No Frost Control Modulating Refer to IOM

Economizer Application / Operation Section:

Yes No Economizer (temperature)

Set point 65°F

Offset 20°F

Differential 2°F

Yes No Economizer (enthalpy)

Set point B

Optional Accessories Section: Operational

Yes No OA Dirty Filter Sensor Yes No N/A

Yes No EA Dirty Filter Sensor Yes No N/A

Yes N o CO2 Sensor Yes No N/A

Yes No Service Outlet Yes No N/A

Yes No Vapor Tight Lights Yes No N/A

Yes No Remote Control Panel Yes No N/A

Variable Frequency Drives Section: Operational

Yes No Blower VFDs Yes No N/A

Damper Section: Operational

Yes No Outdoor Air Damper Yes No N/A

Yes No Exhaust Air Damper Yes No N/A

Model PVe Heat Recovery Unit

Start-Up Components

Fans

The unit contains a forwardcurved supply fan and a forward curved exhaust fan. These forward-curved fans should be checked for free rotation. If any binding occurs, check for concealed damage and foreign objects in the fan housing. Be sure to check the belt drives per the start-up recommendations in the following section.

CAUTION

When operating conditions of the fan are to be changed (speed, pressure, temperature, etc.), consult manufacturer to determine if the unit can operate safely at the new conditions.

Centering of the fan wheel can be accomplished by loosening the wheel hub set screw and moving the wheel to the desired position.

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. The start-up technician must check blower amperage to ensure that the amperage listed on the motor nameplate is not exceeded. Amperage to be tested with access doors closed and ductwork installed.

Fan Belt Drives

The fan belt drive components, when supplied by manufacturer, have been carefully selected for the unit’s specific operating condition. Utilizing different components than those supplied could result in unsafe operating conditions which may cause personal injury or failure of the following components:

• Fan Shaft • Bearings • Motor

• Fan Wheel • Belt

Tighten all fasteners and set screws securely and realign drive pulleys after adjustment. Check pulleys and belts for proper alignment to avoid unnecessary belt wear, noise, vibration and power loss. Motor and drive shafts must be parallel and pulleys in line (see diagrams in Belt Drive Installation section).

Forward Curved

Exhaust Fan

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.

1.5 in.

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 straightedge to centerline.

5. Place belts over sheaves. Do not pry or force belts, as this could result in damage to the cords in the belts.

6. With the fan off, adjust the belt tension by moving the motor base. (See belt tensioning procedures in the Routine Maintenance section of this manual).

Pulley

alignment

example

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.

WRONG WRONG

WRONG CORRECT

Proper alignment of motor and drive shaft.

Direction of Fan Wheel Rotation

Blower access is labeled on unit. Check for proper wheel rotation by momentarily energizing the fan. Rotation is determined by viewing the wheel from the drive side and should match the rotation decal affixed to the fan housing.

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.

Forward Curved

0.25 in.

centerline

straightedge

2 in.

Airﬂow

Model PVe Heat Recovery Unit

Fan RPM

Supply fan and exhaust fan will have an adjustable motor pulley (on 15 HP and below) preset at the factory to the customer-specified RPM. Fan speed can be increased or decreased by adjusting the pitch diameter of the motor pulley. Multi-groove variable pitch pulleys must be adjusted an equal number of turns open or closed. Any increase in fan speed represents a substantial increase in load on the motor. Always check the motor amperage reading and compare it to the amperage rating shown on the motor nameplate when changing fan RPM. All access doors must be installed except the control center door.

Vibration

Excessive vibration may be experienced during initial start-up and can cause a multitude of problems, including structural and/or component failure.

Vibration Causes

Off axis or loose components Drive component unbalance Poor inlet / outlet conditions Foundation stiffness

Many of these conditions can be discovered by careful observation. Refer to the Troubleshooting section of this manual

for corrective actions. If observation cannot locate the source of vibration, a qualified technician using vibration analysis equipment should be consulted. If the problem is wheel unbalance, in-place balancing can be done.

Generally, fan vibration and noise is transmitted to other parts of the building by the ductwork. To eliminate this undesirable effect, the use of heavy canvas connectors is recommended.

Optional Start-Up Components

Setscrew (on front of switch) must be manually adjusted after the system is in operation.

4. 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.

5. Open the ﬁlter compartment and remove the obstructing material.

6. 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.

Frost Control

Timed Exhaust

1. Remove power from unit.

2. Jumper the temperature indicating thermodisc in the unit control center. Thermodisc has a pre-set temperature of 5°F.

3. Set the frost control timer scale for T1 and T2 to 1m. Set the timer settings for T1 and T2 to 10.

4. Add power to the unit. Blower should cycle on for one minute, then turn off for one minute.

5. Remove power from unit and remove jumpers that were placed. Reset timer settings.

• T1 timer

setting set to 5 and timer scale set to 10m for 5 minutes of wheel off time.

• T2 timer

setting set to 5 and timer scale set to 1h for 30 minutes of wheel on time.

Timer Scale

Timer

Settings

Timer Scale

Settings

Negative pressure connection is toward the ‘front or top’ of the switch. (Senses pressure on

the blower side of filters)

Positive pressure connection is toward the ‘back or bottom’ of the switch. (Senses pressure at air inlet side of filters)

Dirty Filter Switch

To adjust the switch, the unit must be running with all of the access doors in place, except for the compartment where the switch is located (exhaust intake compartment). The adjusting screw is located on the top of the switch.

1. Open the ﬁlter compartment and place a sheet of plastic or cardboard over 50% of the ﬁlter media.

2. Replace the ﬁlter compartment door.

3. Check to see if there is power at the alert signal leads (refer to electrical diagram).

Model PVe Heat Recovery Unit

Variable Frequency Drives

Optional factory-installed, wired, and programmed variable frequency drives (VFDs) may have been provided for modulating or multi-speed control of the blowers and energy recovery wheel for economizer and frost control modes. One VFD, either Yaskawa model V1000 or J1000, is provided for each blower (supply air and exhaust) and one Yaskawa model J1000 is provided for the energy recovery wheel.

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. 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.

IGS-S+R-R+

MPACAMAC+VA2A1PCP2P1

MA MB MCRPH1SCHCS7S6S5S4S3S2S1

J1000

V1000

A1 AC

SEE VFD INSTALLATION MANUAL FOR MORE DETAIL

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

USER TO PROVIDE CONTACTS AND ISOLATION AS REQUIRED

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

0-10 VDC CONTROL SIGNAL (BY OTHERS) WIRED TO A1 (+) AND AC (COMMON) 0 VDC=30 Hz 10 VDC=60 Hz

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

OPTION 2 - MULTI SPEED CONTROL

S5S4 SC

NEITHER S4 OR S5 CONTACT CLOSED DRIVE SPEED = 60 Hz.

S4 TO SC CONTACT CLOSED (BY OTHERS) DRIVE SPEED = 40 Hz.

S5 TO SC CONTACT CLOSED (BY OTHERS) DRIVE SPEED = 30 Hz.

MA MB MCACAMAC+VA1SCS5S4S3S2S1

Factory Set Points

Variable frequency drives (VFDs) for the blowers are factory setup to operate in one of the three following modes:

• Modulating: 0-10 VDC signal wired in the ﬁeld by others varies the speed of the blower between 30 and 60Hz

• Multi-speed: Digital contact closures by others command the VFD to run at multiple speed settings:

- Open - Drive runs at 60Hz

- SC to S4 - Drive runs at 40Hz

- SC to S5 - Drive runs at 30Hz

• CO

Sensor:

Set Point Control: A carbon dioxide sensor is

provided from the factory for ﬁeld-mounting OR unit mounting in the space(s) being served by the energy recovery unit. The CO

sensors are wired

to the unit VFD’s with two preset speeds of 700 PPM or less CO2 = 50% fan speed and 800 PPM or greater CO2 = 100% fan speed.

Proportional Control: A carbon dioxide sensor is

provided from the factory for ﬁeld-mounting OR unit mounting in the space(s) being served by the energy recovery unit. The CO

sensors are wired

to the unit VFD’s with default factory settings of 500 PPM or less CO

= 50% fan speed and

1000 PPM or greater CO2 = 100% fan speed. Modulation of VFD occurs proportional to CO2 between 500 and 1000 PPM.

The terminal locations for Modulating and Multi-speed are shown on the previous page. 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. These settings are based on the VFD mode selected.

Change Set Points

To gain access to change set points on the V1000 and J1000 drives, parameter A1-01 needs to be set at “2”. To prevent access or tampering with drive settings on either drive, change parameter A1-01 to “0”.

• Drive Operation

- SC to S1 contact for On/Off

- A1 (0-10 VDC) referenced to AC

Can use +15 VDC from +V

Resetting the V1000 drive to factory defaults

To reset the V1000 drive back to Greenheck factory defaults go to parameter A1-01 and set it to “2”. Then go to A1-03 and change it to “1110” and press enter. The drive is now reset back to the settings programmed at Greenheck. This option is not available on the J1000.

Model PVe Heat Recovery Unit

MODULATING CONTROL FOR FAN SPEED

(0-10 VDC)

Parameter

A1-01 Access Level 2 2 b1-17 VFD Start-Up Setting 1 1 C1-01 Acceleration Time 30 sec. 30 sec. C1-02 Deceleration Time 30 sec. 30 sec. C6-02 Carrier Frequency 1 1 d2-02 Ref Lower Limit 50% 50%

E2-01 Motor Rated FLA

H3-04 Terminal A1 Bias 50% 50% A1-01 Access Level 0 0

Setting

V1000 J1000

Motor

FLA

Motor

FLA

MULTI-SPEED CONTROL FOR FAN SPEED

(1/3 OR 1/2 SPEED REDUCTION)

Parameter

A1-01 Access Level 2 2

b1-01 Reference Source (Frequency) 0 0

b1-17 VFD Start-Up Setting 1 1

C1-01 Acceleration Time 30 sec. 30 sec.

C1-02 Deceleration Time 30 sec. 30 sec.

C6-02 Carrier Frequency 1 1

d1-01 Frequency Reference 1 60 Hz 60 Hz

d1-02 Frequency Reference 2 40 Hz 40 Hz

d1-03 Frequency Reference 3 30 Hz 30 Hz

d1-04 Frequency Reference 4 60 Hz 60 Hz

d2-02 Ref Lower Limit 50% 50%

E2-01 Motor Rated FLA

H1-04

H1-05

H1-06

H3-10 A2 Not Used F NA

A1-01 Access Level 0 0

Multfunction Input Sel 4

(Terminal S4)

Multifunction Input Sel 5

(Terminal S5)

Multifunction Input Sel 6

(Terminal S6)

Setting

V1000 J1000

Motor

FLA

5NA

Motor

FLA

CO2 SENSOR CONTROL FOR FAN SPEED

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

(FULL SPEED WHEN C02 RISES ABOVE 800 PPM)

Parameter

A1-01 Access Level 2 2

b1-01 Reference Source (Frequency) 0 0

b1-17 VFD Start-Up Setting 1 1

C1-01 Acceleration Time 30 sec. 30 sec.

C1-02 Deceleration Time 30 sec. 30 sec.

C6-02 Carrier Frequency 1 1

d1-01 Frequency Reference 1 60 Hz 30 Hz

d1-02 Frequency Reference 2 30 Hz 60 Hz

d2-02 Ref Lower Limit 50% 50%

E2-01 Motor Rated FLA

H3-10 A2 Not Used F NA

A1-01 Access Level 0 0

Setting

V1000 J1000

Motor

FLA

Motor

FLA

Model PVe Heat Recovery Unit

Routine Maintenance

Overview

The unit 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 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 psi. Do not force sharp objects against the heat transfer surfaces or damage to the flat plates may occur.

DANGER

CAUTION

Once the unit has been put into operation, a routine maintenance program should be set up to preserve reliability and performance. Items to be included in this program are:

Lubrication

Apply lubrication where required

Dampers

Check for unobstructed operation

Fan Belts

Check for wear, tension, alignment

Motors

Check for cleanliness

Blower Wheel & Fasteners

Check for cleanliness Check all fasteners for tightness Check for fatigue, corrosion, wear

Bearings

Check for cleanliness Check set screws for tightness Lubricate as required

External Filter

Check for cleanliness - clean if required

Internal Filter

Check for cleanliness - replace if required

Door Seal

Check if intact and pliable

Model PVe Heat Recovery Unit

Maintenance Procedures

WARNING

REFER TO GENERAL SAFETY INFORMATION

Do not operate this unit without the filters and birdscreen installed. They prevent the entry of foreign objects such as leaves, birds, etc.

Do not remove access panels or other unit components while standing on a ladder or other unsteady base. Access panels and unit components are heavy and serious injury may occur.

Lubrication

Check all moving components for proper lubrication. Apply lubrication where required. Any components showing excessive wear should be replaced to maintain the integrity of the unit and ensure proper operation.

Dampers

Check all dampers to ensure they open and close properly and without binding. Backdraft dampers can be checked by hand to determine if blades open and close freely. Apply power to motorized dampers to ensure the actuator opens and closes the damper as designed.

Fan Belts

Belts must be checked on a regular basis for wear, tension, alignment, and dirt accumulation. Premature or frequent belt failures can be caused by improper belt tension (either too loose or too tight) or misaligned sheaves. Abnormally high belt tension or drive misalignment will cause excessive bearing loads and may result in failure of the fan and/or motor bearings. Conversely, loose belts will cause squealing on startup, excessive belt flutter, slippage, and overheated sheaves. Both loose and tight belts can cause fan vibration.

When replacing belts on multiple groove drives, all belts should be changed to provide uniform drive loading. Do not pry belts on or off the sheave. Loosen belt tension until belts can be removed by simply lifting the belts off the sheaves. After replacing belts, insure that slack in each belt is on the same side of the drive. Belt dressing should never be used.

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

Belt Span

The proper belt setting is the lowest tension at which the belts will not slip under peak load operation. For initial tensioning, set the belt deflection at 1/64-inch for each inch of belt span (measured halfway between sheave centers). For example, if the belt span is 64 inches, the belt deflection should be oneinch (using moderate thumb pressure at mid-point of the drive). Check belt tension two times during the first 24hours of operation and periodically thereafter.

Model PVe Heat Recovery Unit

Deflection =

Belt Span

Fan Motors

Motor maintenance is generally limited to cleaning and lubrication. Cleaning should be limited to exterior surfaces only. Removing dust and grease buildup on the motor housing assists proper motor cooling. Never washdown motor with high pressure spray. Greasing of motors is only intended when fittings are provided. Many fractional motors are permanently lubricated for life and require no further lubrication.

Fan Wheel & Fasteners

Wheels require very little attention when moving clean air. Occasionally oil and dust may accumulate on the wheel causing imbalance. When this occurs the wheel and housing should be cleaned to assure smooth and safe operation. Inspect fan impeller and housing for fatigue, corrosion or wear.

Routinely check all fasteners, set screws and locking collars on the fan, bearings, drive, motor base and accessories for tightness. A proper maintenance program will help preserve the performance and reliability designed into the fan.

Bearings

Most bearings are permanently lubricated and require no further lubrication under normal use. Normal use being considered -20º 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.

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 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

Parts List

1. Supply blower

• Forward curved fan

• Adjustable motor mount for belt tensioning

• Adjustable sheaves for speed control

Filter Size and Quantities

Unit Size

PVe-20 12 x 25 x 2 3 3

PVe-35 16 x 25 x 2 3 3

PVe-45 20 x 25 x 2 3 3

PVe-55 24 x 24 x 2 3 3

All dimensions in inches.

Pleated Filter Size Quantity

Supply and Exhaust Supply Exhaust

Door Seals

Slip-on type seal is installed on the door. Inspect at least annually to ensure that seal is still pliable and intact.

2. Vibration isolators (quantity 4 per blower)

• Neoprene

3. Aluminum plate heat exchanger

4. Supply weatherhood with 2-inch aluminum mesh

filter

5. Exhaust weatherhood with birdscreen

6. Supply and exhaust air filter racks for

2-inch pleated, 30% efficient filters

7. Electrical control box (standard features)

• Single point power

• Disconnect interlocked with access door

• Motor starters for the supply and exhaust blower

• 24 VAC, control circuit with terminal strip

Not depicted on this image

8. Exhaust blower

• Forward curved fan

• Adjustable motor mount for belt tensioning

• Adjustable sheaves for speed control

Model PVe Heat Recovery Unit

Troubleshooting – Airﬂow

Test and Balance Report

The Test and Balance Report (TAB) is utilized to determine whether the appropriate amount of outdoor air and exhaust air is being supplied and removed from a building, respectively. There are no set rules on what information must be included in a TAB report. As such, if a TAB report indicates that the airflow on a unit is low, prior to contacting the factory, please determine the following information:

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

Troubleshooting – Unit

Symptom Possible Cause Corrective Action

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

Blower fails to operate

Motor starters “chatter” or do not pull in

Motor over amps

Defective motor or capacitor. Replace.

Motor overloaded. Reset VFD and check amps.

Electrical.

Control power (24 VAC) wiring run is too long. (Resistance should not exceed 0.75 ohms).

Incoming supply power is less than anticipated. Voltage supplied to starter coil must be within +10% / -15% of nominal voltage stated on the coil.

Static pressures are higher than design. Check for dirty filters. Improve ductwork.

Motor voltage incorrect.

Motor horsepower too low.

Shorted windings in motor. Replace motor.

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

System static pressure too high.

Blower speed too low.

Check for On/Off switches. Check for correct supply voltage. Check Control wiring.

Shorten wiring run to mechanical room or install a relay to turn unit on/off. Consult factory for relay information. Increase wire gauge size so that resistance is 0.75 ohms or less.

Need to increase supply power or use a special control transformer which is sized for the actual supply power.

Check motor wiring. Check motor nameplate versus supplied voltage.

See specifications and catalog for fan curves to determine if horsepower is sufficient.

Improve ductwork to eliminate losses using good duct practices.

Check maximum motor RPM and compare with catalog data. Verify that external control wiring is in place if required.

Low airflow (cfm)

High airflow (cfm)

Excessive noise or vibration

Fan wheels are operating backwards.

Dirty filter.

Leaks in ductwork. Repair.

Elbows or other obstructions may be obstructing fan outlet.

Blower fan speed too high.

Filter(s) not in place. Install filters.

Insufficient static pressure (Ps). (airflow resistance)

Fan wheel rubbing on inlet.

Bearings.

Loose wheel on shaft. Tighten wheel hub.

Motor base or blower loose. Tighten mounting bolts.

Noise being transmitted by duct.

For 3-phase, see Direction of Fan Wheel Rotation Direction in Start-Up Components section.

Replace filters or follow cleaning procedures in Routine Maintenance section of this manual.

Correct or improve ductwork.

Check for correct maximum fan RPM. Decrease maximum fan speed if necessary in the VFD.

Induce Ps into system ductwork. Make sure grilles and access doors are installed. Decrease fan speed if necessary.

Adjust wheel and/or inlet cone. Tighten wheel hub or bearing collars on shaft.

Replace defective bearing(s). Lubricate bearings. Tighten collars and fasteners.

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.

Always have a completed Pre-Start-Up Checklist and Start-Up Checklist prior to requesting parts or service information.

Model PVe Heat Recovery Unit