Greenheck VER Installation Manual

Document 471849

Energy Recovery Ventilator

VersiVent

Installation, Operation and Maintenance Manual

Please read and save these instructions for future reference. 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!

VersiVent - Model VER

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

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.

Precaution should be taken in explosive atmospheres.

VersiVent Energy Recovery Ventilator

Table of Contents

General Safety Information ...................1

Receiving, Handling and Storage ..............3

Product Overview ...........................4

Optional Subassemblies ......................4

Installation

Unit Dimensions and Weights ..................5

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

Service Clearances ..........................7

Access Panel Descriptions and Locations ........8

Recommended Roof Openings .................9

Handling ...................................9

Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Roof Curb Mounting ........................10

Rail Mounting/Layout ........................10

Duct Connections ..........................11

Electrical Installation

Warnings .................................12

Procedure .................................12

Field-Provided Disconnect ....................13

Discharge Air Temperature Sensor .............13

Typical Control Center Components ............13

Optional Accessory Wiring Schematics ..........14

Piping Installation

Optional Gas Piping .........................15

Gas Connections ...........................15

Optional Coil Piping .........................15

Water Coils ..............................15

Direct Expansion .........................15

Condensate Drain Trap ....................16

Unit Overview

Basic Unit .................................17

Optional Component Overview

Economizer ...............................17

Frost Control ..............................18

Variable Frequency Drive .....................18

CO2 Sensor ...............................18

Phase Monitor .............................18

Rotation Sensor ............................18

Dirty Filter Sensor ..........................18

Microprocessor Controller ....................19

Unoccupied Recirculation Damper .............19

Service Outlet ..............................19

Vapor Tight Lights ..........................19

Hot Gas Bypass Valve .......................19

Hot Gas Reheat Valve .......................19

Digital Scroll Compressor ....................19

Cooling System Overview

Packaged DX ..............................20

Start-Up

Warnings .................................21

Special Tools Required ......................21

Start-Up Procedure .........................21

Voltage Imbalance ..........................21

Pre-Start-Up Checklist .......................22

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

Optional Accessories Checklist ................24

22-23

Start-Up Components

Energy Wheel ..............................25

Fans - Supply and Exhaust ................25-26

Vibration ..................................26

Hot Gas Bypass Valve .......................26

Optional Components Start-Up

Dirty Filter Sensor ..........................27

Economizer ...............................27

Frost Control ..............................28

Variable Frequency Drives ................29-30

Routine Maintenance

Maintenance Frequency ......................31

Units with Packaged DX .....................31

Maintenance Procedures

Lubrication ..............................32

Dampers ................................32

Gas Furnace .............................32

Fan Belts ...............................32

Fan Motors ..............................32

Fan Wheel and Fasteners ..................32

Bearings ................................32

Internal Filter ............................32

External Filter ............................33

Coils ...................................33

Door Seals ..............................33

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

Troubleshooting

Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Refrigeration Circuit ......................36-39

Energy Wheel ..............................39

Controller Alarms ...........................40

Rotation Sensor ............................40

Digital Scroll Compressor ....................40

Economizer ...............................41

Reference

Technical Assistance Information ..............41

Additional Installation, Operation and

Maintenance Manuals .....................41

Component Location ........................42

Maintenance Log ...........................43

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

VersiVent Energy Recovery Ventilator

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 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 thoroughly clean with Tectyl hard to reach internal surfaces or for occasional use, consider using Tectyl or the equivalent.

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

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

506 (Ashland Inc.) or the equivalent. For

511M Rust Preventive or WD-40®

VersiVent Energy Recovery Ventilator

Product Overview

The VER units bring in fresh, outdoor air and remove stale, exhaust air. Prior to discharging the exhaust air, the energy recovery wheel transfers energy from the exhaust air to the outdoor air at an efﬁciency of 7080%. Simply put, this unit preconditions the outdoor air to save money on heating and cooling costs. These particular units also have cooling and heating options available after the recovery wheel to further condition the fresh air.

Optional Subassemblies

Dampers

Backdraft dampers are always included as an integral part of the exhaust hood assemblies. Motorized outdoor air and return air dampers are optional and are factorymounted (and wired) at the intake.

Hot Water / Chilled Water Coils

Water coils can be used for a single purpose such as heating or cooling, or their function can be alternated between heating and cooling by changing the temperature of the water ﬂowing through the coil. Depending on the application, it may be necessary to use a glycol mixture to prevent the liquid from freezing. The water coils are engineered to operate at pressures up to 250 PSIG and temperatures up to 300°F, but ancillary equipment such as valves and pumps will often dictate lower operating temperatures. All water coils are pressure tested at the factory with 450 PSIG of dry nitrogen.

Electric Post-Heaters

The optional post-heater is used as a heat source for the building and is integrated into the supply airstream.

A temperature sensor (with a ﬁeld-adjustable set point) is mounted in the supply airstream after the post-heater to turn the post-heater on. A SCR heater allows for an inﬁnite amount of modulating control of the heat to provide an accurate discharge temperature during the call for heat.

As standard, the post-heater control panel is not single point wired to the unit control center. Separate power must be supplied to the post-heater disconnect (located in unit control center). Electric heaters are available in 208, 230, 460, or 575 VAC (refer to heater nameplate for voltage).

Indirect Gas Furnace

An optional indirect gas furnace may be installed and provides supplementary heat to the building. Refer to the PVF/PVG Indirect Gas-Fired Heat manuals provided with the unit. A unit-speciﬁc wiring diagram is located inside the furnace housing access door.

Outdoor Air Weatherhood

Outdoor air weatherhood will be factory-mounted.

Exhaust Air Weatherhood

The exhaust weatherhood is shipped separately as a kit with its own instructions. Backdraft dampers are always included as an integral part of the exhaust hood assemblies.

Packaged Direct Expansion (PDX)

The DX system comes fully charged from the factory with refrigerant and is ready for installation upon arrival. All units come standard with two compressors. This allows for staging of compressors to meet a wider range of outdoor air loads while reducing the amount of cycles per compressor.

Integral Components

All units are provided with an expansion valve, hermetic scroll compressor(s), liquid line ﬁlter drier, high pressure manual reset cutout, low pressure auto-reset cutout, time delays for compressor protection, service/charging valves, moisture indicating sight glass, and optional hot gas bypass. The compressors also come standard with a crankcase heater for additional protection.

Split DX

The unit can be equipped with two evaporator coils that will be connected to a separate condensing unit (provided by others). Depending on controlling options, the condensing unit will be controlled by others or could receive a call for stage 1 and stage 2 of cooling with the integral microprocessor controller. The microprocessor controller will only provide a call for cooling, it will not send a digital control signal to the compressors. Piping components such as thermostatic expansion valve, ﬁlter drier, sight glass, etc., shall be ﬁeld-provided.

VersiVent Energy Recovery Ventilator

Installation

Unit Weights & Dimensions

Plan View

BC D*L*EF G

Electrical Box

Wheel Cassette

Exhaust Air Discharge

Wheel

Section

2-inch Filters

4-inch Final Filters

Return Air Intake

Optional

Coil Section

Blower

Section

Optional

IG Heater Section

Supply Air Discharge

Optional

Condensing Section

2-inch Filters

Outdoor Air Intake

Intake

Section

Condensing Coil

Outdoor Air Hood

2-inch Filters

Wheel Cassette

2-inch Filters

Drain Pan Connection

4-inch Final Filters

Condensing Coil

IG Gas Connection

Elevation View

Unit Size

VER-45 16.381 28.146 44.627 30.159 36.159 44.159 50.275 36.312 47.571 63.964 65.851 18.780 69.987

VER-65 16.381 30.825 46.597 30.159 36.159 44.159 50.275 38.124 47.571 65.958 72.098 23.358 76.246 6300

VER-90 16.381 34.825 85.658 30.159 36.159 44.159 50.275 41.312 47.571 65.958 65.851 23.358 91.010 7250

All dimensions shown in inches. *L Sum the lengths of the appropriate modules to get the total length of the unit. ^Weight: The weights shown are a worse case scenario based on the sheet metal and component weights for the unit. These weights include sheet metal

ABC

weights added together with the largest fans, coils and heaters for the unit.

D1 D2 D3 D4

HW HW + DX CW + HP HW + CW + HP

CW HW + CW DX + HP HW + DX + HP

DX EH + CW DX + HGRH EH + DX + HP

EH EH + DX DX + HW + HGRH EH + CW + HP

D1 D2 D3 D4

D* Coil Module Options

DX + EH + HGRH

EFGH IWL*

HW = Hot Water

CW = Chilled Water

DX = Direct Expansion

EH = Electric Heat

HP = Wrap-around Heat Pipe

HGRH = Hot Gas Reheat

^Weight

see

note

(lbs.)

4900

VersiVent Energy Recovery Ventilator

Curb Outside Dimensions and Weights

Outdoor Air Weatherhood

Intake

Section

2-inch Filters

Wheel

Section

Wheel Cassette

2-inch Filters

Optional

Coil Section

4-inch Final Filters

Blower Section

IG Heater Section

Optional

Condensing Section

Condensing Coil

L* - 3.75 inches

W - 3.75 inches

A B C* D

Drain Pan Connection IG Gas Connection

Subtract 3.75 inches from dimensions W & L* to get the outside curb dimensions.

Elevation View

Unit Size

C1 C2 C3 C4

DEFWL*

VER-45 28.146 44.627 30.159 36.159 44.159 50.275 36.312 47.571 27.909 69.987

VER-65 30.825 46.597 30.159 36.159 44.159 50.275 38.124 47.571 27.909 76.246 473

VER-90 34.825 85.658 30.159 36.159 44.159 50.275 41.312 47.571 27.909 91.010 621

All dimensions shown in inches. L* — Sum up the applicable section dimensions (A–F) for your unit to get the overall length. ^ — Curb weights shown are for the worst case scenario (largest curb) possible for each size unit.

C* Coil Module Options

C1 C2 C3 C4

HW HW + DX CW + HP HW + CW + HP

CW HW + CW DX + HP HW + DX + HP

DX EH + CW DX + HGRH EH + DX + HP

EH EH + DX DX + HW + HGRH EH + CW + HP

DX + EH + HGRH

HW = Hot Water EH = Electric Heat

CW = Chilled Water HP = Wrap-around Heat Pipe

DX = Direct Expansion HGRH = Hot Gas Reheat

Most factory-supplied electrical components are prewired. To determine what electrical accessories require additional ﬁeld wiring, refer to the unit-speciﬁc wiring diagram located on the inside of the unit control center access door. The low voltage control circuit is 24 VAC and control wiring should not exceed 0.75ohms.

Control wires should not be run inside the same conduit as that carrying the supply power. Make sure that ﬁeldsupplied conduit does not interfere with access panel operation.

Curb Weight^

(lbs.)

447

see

note

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

Side of Unit

1 in.

2½ in.

1.195 in. 1 in.

and wired in lieu 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

1 in.

to comply with these guidelines may cause motor starters to “chatter” or not pull in which can cause contactor failures and/or motor failures.

Note: Standard factory-installed electric post-heaters

have their own disconnect separate from the unit disconnect. Thus, each electric post-heater requires its own separate power connection.

Roof Curb

Recommended 2-inches of Insulation

Curb Cap Details

VersiVent Energy Recovery Ventilator

Service Clearances

VER-45, 65 and 90 units require minimum clearances for access on all sides for routine maintenance. Filter replacement, drain pan inspection and cleaning, energy wheel cassette inspection, fan bearing lubrication and belt adjustment are examples of routine maintenance that must be performed. Blower and motor assemblies, energy recovery wheel cassette, coil and ﬁlter sections are always provided with a service door or panel for proper component access. Clearances for component removal may be greater than the service clearances, refer to drawings for these dimensions.

Additional clearances for units with packaged DX

Clearances must be maintained on all sides of this unit. This especially is true with the top of this unit. Hot air is being discharged through the condensing fans during operation, and the more clearance available, the better the chance of avoiding recirculation or coil starvation. This unit should never be placed under an overhang or inside a building. A minimum of 48 inches over the condensing fans is recommended.

Minimum 48 inches clearance

ACCESS

PANEL

ACCESS

PANEL

VER-90

ONLY

ACCESS

PANEL

ACCESS

PANEL

ACCESS

PANEL

TRTR

Minimum 24 inches clearance

Condensing Coil Intake

Keep this area clear

Unit Clearances

Unit Size A B C D

VER-45 65 42 36 24

VER-65 70 42 36 24

VER-90 65 42 65 24

All dimensions shown in inches.

ACCESS

PANEL

ACCESS

PANEL

TRTR

ACCESS

PANEL

ACCESS

PANEL

ACCESS

PANEL

Access Panels may change depending on options selected.

VersiVent Energy Recovery Ventilator

Access Panel Descriptions and Locations

Following is a list of items accessible through the access doors shown on the diagrams. Some items are optional and may not have been provided.

#8 – Supply Fan

#9 – Compressors

#6 – Control Panel

#2 – OA Intake Damper

and Electric Preheat

#7 – IG Furnace

Control Center

#5 – Packaged DX

Coil and Final Filter

1. Aluminum mesh ﬁlters (intake hood)

2. Outdoor air intake damper Electric pre-heater

3. Exhaust fan, motor, and drives

4. Energy recovery wheel, motor, belt, and seals Exhaust air ﬁlters Return air intake damper (optional) Outdoor air ﬁlters Frost control sensors (optional) Economizer sensors (optional)

5. Coil access / drain pan / ﬁnal ﬁlters Bypass damper (optional)

#4 – Filter & Wheel

6. Control center All electrical controls VFD for energy recovery wheel (optional)

7. Indirect gas furnace control center

8. Supply air fan, motor, and drives (with indirect gas furnace) Electric post-heater control center (optional)

9. Compressor(s) –

(optional)

#3 – Exhaust Fan

VersiVent Energy Recovery Ventilator

Recommended Roof Opening

Refer to weight and dimension data to determine the exact location of the section containing the outdoor air discharge opening. If the unit is equipped with an Indirect Gas Heater (IG) section, the outdoor air discharge opening will be in that section; if not, it will be in the blower section. The return air intake will be consistent for all units. The dimensions of these openings and their locations are illustrated below.

Return Air Intake

Supply Air Discharge

VER-45 A B C D E F G H

1 56.9 4.7 51.5 15.9 26.9 42.7 3.3 11.8 2 56.9 4.7 51.5 15.9 33.8 34.1 7.4 14.4 3 56.9 4.7 51.5 15.9 33.8 34.1 35.3 14.4 4 56.9 4.7 51.5 15.9 26.9 42.7 31.2 11.8

VER-65 A B C D E F G H

1 59.9 6.3 56.1 15.9 29.9 51.9 2.7 10.3 2 59.9 6.3 56.1 15.9 30.9 49.9 7.3 7.1 3 59.9 6.3 56.1 15.9 30.9 49.9 35.2 7.1 4 59.9 6.3 56.1 15.9 29.9 51.9 30.6 10.3

VER-90 A B C D E F G H

1 77.9 4.7 99.2 15.9 33.8 61.9 2.0 12.7 2 77.9 4.7 99.2 15.9 33.8 51.9 7.5 17.7 3 77.9 4.7 99.2 15.9 33.8 51.9 35.3 17.7 4 77.9 4.7 99.2 15.9 33.8 61.9 29.9 12.7

All dimensions are in inches. IG = Indirect Gas Furnace; PDX = Packaged DX Cooling 1 = Any unit without IG and PDX.

Blower Module is at the end of the unit. 2 = Any unit with IG that does not have PDX. 3 = Any unit with IG and PDX 4 = Any unit without IG and with PDX

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.

Lifting

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 Unit Weights & Dimensions section.

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.

When cutting only duct openings, cut opening oneinch (25 mm) larger than duct size to allow clearance for installation. Area enclosed by roof curb must comply with clearance to combustible materials. If the roof is constructed of combustible materials, area within the roof curb must be ventilated, left open, or covered with non-combustible material which has an “R” value of at least ﬁve. If area within curb is open, higher radiated sound levels may result.

Where the supply or warm air duct passes thru a combustible roof, a clearance of one inch must be maintained between the outside edges of the duct and combustible material in accordance with NFPA Standard 90A. Position the unit roof opening such that the supply discharge and exhaust inlet of the unit will line up with the corresponding ductwork. Be sure to allow for the recommended service clearances when positioning opening (see Service Clearances). Do not face the outdoor air intake of the unit into prevailing wind and keep the intake away from any other exhaust fans. Likewise, position the exhaust discharge opening away from outdoor air intakes of any other equipment.

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

7. Never lift units by weatherhoods.

8. Never lift units in windy conditions.

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

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

11. Do not use fork lifts for handling unit.

VersiVent Energy Recovery Ventilator

Roof Curb Mounting

Roof curb details, including duct location dimensions, are available on VER roof curb assembly instructions.

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

1. Factory-Supplied Roof Curbs

Roof curbs are Model GKD, which are shipped in a knockdown kit (includes duct adapter) and require ﬁeld-assembly (by others). Assembly instructions are included with the curb.

2. Install Curb

Locate curb over roof opening and fasten in place. Check that the diagonal dimensions are within ±1/8 inch of each other and adjust as necessary. For proper coil drainage and unit operation, it is important that the installation be level. Shim as required to level.

3. Install Ductwork

Installation of all ducts should be done in accordance with SMACNA and AMCA guidelines. Duct adapter provided to support ducts prior to setting the unit.

4. Set the Unit

Lift unit to a point directly above the curb and duct openings. Guide unit while lowering to align with duct openings. Roof curbs ﬁt inside the unit base. Make sure the unit is properly seated on the curb and is level.

Rail Mounting and Layout

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

• Make sure that rail positioning does not interfere with the supply air discharge opening or the return air intake opening on the VER unit.

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

• Set unit on rails.

Rails are positioned in random places. See table for proper location

Isometric View

Return Air

Intake

AB CD

Side View

Unit A B C D

VER-45 53.3 16

VER-65 58.1 16

VER-90 105.3 16

All dimensions shown in inches. IG = Indirect Gas

CS = Condensing Section

33.8 w/IG 27 w/o IG

31.0 w/IG 30 w/o IG

33.8 w/IG 34 w/o IG

Supply Air Discharge

9.2 IG w/o CS; 37.1 IG w/CS

5.2 w/o IG and CS

33.1 w/o IG and w/ CS

9 IG w/o CS; 36.9 IG w/CS

4.6 w/o IG and CS

32.5 w/o IG and w/ CS

9.2 IG w/o CS; 37.1 IG w/CS

3.7 w/o IG and CS

31.6 w/o IG and w/ CS

VersiVent Energy Recovery Ventilator

Ductwork Connections

Supply Fan

The supply fan in this unit is a plenum style fan. The discharge opening dimensions are provided. For proper fan performance, match the duct size to the dimensions listed. Installation of all ducts should be done in accordance with SMACNA.

Supply Fan Discharge Opening Dimensions

Supply Air

Unit

Discharge Location

Top End Bottom

VER-45 38.5 x 30 41.8 x 27

VER-65 50 x 31 50 x 31

VER-90 62 x 34 59.7 x 35

All dimensions shown in inches.

See diagram in Recommended Roof Openings section for the

Bottom Discharge opening sizes.

Exhaust Fan

The exhaust fan in this unit is a forward-curved fan. Good and poor fan-to-duct connections are shown. Airﬂow out of the fan should be directed straight or curved the same direction as the fan wheel rotates. Poor duct installation will

result in low airﬂow and other system effects.

Length of

Straight Duct

(Supply Fan)

POOR

Length of Straight Duct

GOOD

Recommended Exhaust Fan Discharge Duct Size

Length of

Straight Duct

(Exhaust Fan)

Unit Duct Size

Exhaust

Blower Size

VER-45 20 x 20 12 48

VER-65 28 x 28 15 60

VER-90 32 x 32 18 60

All dimensions shown in inches.

• Recommended duct sizes are based on velocities across the cfm range of each model at approximately 800 feet per minute (FPM) at minimum airflow and up to 1600 fpm at maximum airflow. Recommended duct sizes are only intended to be a guide and may not satisfy the requirements of the project. Refer to plans for appropriate job specific duct size and/or velocity limitations.

• Straight duct lengths were calculated based on 100% effective duct length requirements as prescribed in AMCA Publication

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

VersiVent Energy Recovery Ventilator

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.

WARNING

If unit is equipped with a microprocessor, terminals Y1, Y2 and W1 cannot be wired to a thermostat. Wiring to these terminals will bypass unit’s internal safeties.

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. Determine the Size of Electric Heater Wiring

An optional electric heater may require a separate power supply. The power connection should be made to the factory-provided electric heater disconnect and must be compatible with the ratings on the nameplate, supply power voltage, phase and amperage. Consult ANSI/NFPA 70 and CSA C22.1 for proper conductor sizing.

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

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

4. 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.

5. 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.

6. 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.

If unit is equipped with a microprocessor, terminals Y1, Y2 and W1 cannot be wired to a thermostat. Wiring to these terminals will bypass unit’s internal safeties.

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.

VersiVent Energy Recovery Ventilator

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

Without Indirect Gas Furnace

For units without an indirect gas furnace, the discharge air temperature sensor is factory-mounted in the blower discharge section of the unit behind the blower cut off plate.

WARNING

Discharge air temperature sensor is to be fieldinstalled prior to unit start-up on units with an indirect gas furnace.

With Indirect Gas Furnace

For units with an indirect gas furnace, the discharge air temperature sensor is to be ﬁeld-installed prior to unit start up at least three duct diameters downstream of the heat exchanger or where good mixed average temperature occurs in the ductwork. The discharge air sensor is shipped loose and can be found in the unit’s control center. See the unit-speciﬁc wiring diagram for connection locations.

Typical Control Center Components

1. Main Disconnect (non-fusible, lockable)

2. Motor Starter - Exhaust Air Fan

3. Motor Starter - Supply Air Fan

4. Motor Contactor - Energy Wheel

5. 24 VAC Control Transformer

6. 24 VAC Terminal strip

7. Fuses for blower motors*

8. Grounding lug

9. Distributor block*

10. Compressor fuse blocks*

11. Compressor contactors*

12. Condensing fan contactors*

13. Compressor relay*

14. Terminal block*

15. Compressor cycle timers*

Optional Control Center Components

16. DDC controller*

17. Dirty ﬁlter pressure switches*

18. Terminal block

19. Energy recovery wheel VFD*

*Not always provided

3 4 19

VersiVent Energy Recovery Ventilator

Optional Accessory Wiring Schematics

Remote Panel

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

• On/off/auto switch

• Dirty ﬁlter light

• Economizer light

• Frost control light

• Wheel rotation sensor light

Unit Interfacing Terminals

Heating/Cooling Switches and Night Setback Switch/ Timer

TERMINAL BLOCKS IN

UNIT CONTROL CENTER

UNIT ON/OFF

COOL STAGE 1 / ECONOMIZER

COOL STAGE 2

HEAT

7-Day Timer

TERMINAL BLOCKS IN

UNIT CONTROL CENTER

BLACK BLUE

RED

(CAPPED)

TIMER

On/Off/Auto Switch & Indictor Light Wiring

TERMINAL BLOCKS IN

UNIT CONTROL CENTER

UNIT ON/OFF

FROST CONTROL

ECONOMIZER

WHEEL ROTATION

OFF

AUTO

* -- BMS, TIMECLOCK,

TSTAT, RTU, ETC.

UNOCCUPIED RECIRCULATION

Dirty Filter Indicator

(Powered by others)

HOT COMMON

SUPPLY DIRTY FILTER SWITCH

EXHAUST DIRTY FILTER SWITCH

DIRTY FILTER

SUPPLY DIRTY FILTER SWITCH

EXHAUST DIRTY FILTER SWITCH

ON/OFF/AUTO SWITCH ALLOWS THREE MODES OF OPERATION "ON" - UNIT IS TURNED ON MANUALLY "OFF" - UNIT IS TURNED OFF MANUALLY "AUTO" - UNIT IS CONTROLLED VIA SCHEDULER OF BMS, TIMECLOCK, TSAT, ETC.

VersiVent Energy Recovery Ventilator

DIRTY FILTER

+ 30 hidden pages