Greenheck ERVe User Manual

Document 473007

Energy 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 ERVe

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 effects motor load. If the fan RPM is changed, the motor current should be checked to make sure it is not exceeding the motor nameplate amps.

5. Do not allow the power cable to kink or come in contact with oil, grease, hot surfaces or chemicals. Replace cord immediately if damaged.

6. Verify that the power source is compatible with the equipment.

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

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

Unpacking

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

Machined parts coated with rust preventive should be restored to good condition promptly if signs of rust occur. Immediately remove the original rust preventive coating with petroleum solvent and clean with lint-free cloths. Polish any remaining rust from surface with crocus cloth or fine emery paper and oil. Do not destroy the continuity of the surfaces. Wipe clean thoroughly with Tectyl® 506 (Ashland Inc.) or the equivalent. For hard to reach internal surfaces or for occasional use, consider using Tectyl® 511M Rust Preventive or WD-40

or the equivalent.

Handling

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

Storage

Units are protected against damage during shipment. If the unit cannot be installed and operated immediately, precautions need to be taken to prevent deterioration of the unit during storage. The user assumes responsibility of the unit and accessories while in storage. The manufacturer will not be responsible for damage during storage. These suggestions are provided solely as a convenience to the user.

Inspection and Maintenance during Storage

While in storage, inspect units once per month. Keep a record of inspection and maintenance performed.

If moisture or dirt accumulations are found on parts, the source should be located and eliminated. At each inspection, rotate all moving components by hand ten to fifteen revolutions to distribute lubricant on motor and bearings. If paint deterioration begins, consideration should be given to touch-up or repainting. Units with special coatings may require special techniques for touch-up or repair.

Energy Recovery Ventilator

Table of Contents

Product Overview

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

Supplemental Installation, Operation and

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

Optional Subassemblies . . . . . . . . . . 3

Installation

Dimensional Data . . . . . . . . . . . . . 4

Recommended Roof Openings & Weights . . . 5

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

Access Panel Description and Location . . . . 5

Handling . . . . . . . . . . . . . . . . . 6

Lifting . . . . . . . . . . . . . . . . . . 6

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

Curb Outside Dimensions and Weights . . . .6-7

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

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

Outdoor Air Weatherhood . . . . . . . . . . 8

Exhaust Weatherhood . . . . . . . . . . . 8

Dampers. . . . . . . . . . . . . . . . . 8

Exhaust Air Damper Installation . . . . . . . 8

Electrical Information

General Electrical Information . . . . . . . 8-9

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

Optional Accessory Wiring Schematics . . . . 10

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

Optional Component Overview

Economizer . . . . . . . . . . . . . . . 11

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

Variable Frequency Drive . . . . . . . . . . 12

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

Rotation Sensor . . . . . . . . . . . . . . 12

Dirty Filter Switch . . . . . . . . . . . . . 12

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

Start-Up

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

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

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

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

Optional Accessories Checklist . . . . . . . 14

Start-Up Components

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

Vibration . . . . . . . . . . . . . . . . . 16

Energy Recovery Wheel . . . . . . . . . . 16

Drive Belt . . . . . . . . . . . . . . . . 16

Air Seals . . . . . . . . . . . . . . . . . 16

Optional Start-Up Components

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

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

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

Variable Frequency Drives . . . . . . . .18-20

Routine Maintenance. . . . . . . . . . .21-23

Troubleshooting

Economizer Alarms . . . . . . . . . . . . 24

Airﬂow. . . . . . . . . . . . . . . . . . 25

Unit . . . . . . . . . . . . . . . . . 25-27

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

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

The ERVe brings in fresh, outdoor air and removes stale, exhaust air. Prior to discharging the exhaust air, the energy recovery wheel transfers energy from the exhaust air to the outdoor air at an effectiveness of 70-80%. Simply put, this unit preconditions the outdoor air to save money on heating and cooling costs.

Enthalpy Wheel

Supply Air to Building

Supply Blower

Return Air from Building

Filters

Exhaust Air

Outdoor Air Weatherhood

Outdoor Air

Exhaust Blower

Exhaust Weatherhood

Supplemental IOMs

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

• Exhaust Weatherhood

Optional Subassemblies

Electric Heater Application/Operation

Factory installed electric heaters can be provided for preheat frost control. An electric preheater warms the outdoor air prior to the energy recovery wheel to prevent frosting on the wheel. Electric heaters are available in 208, 230, or 460 VAC (refer to heater nameplate for voltage).

Preheaters: Preheaters are standard as single-stage on/off control. Preheaters are single point wired at the factory. A thermodisc temperature sensor (with a 5°F set point) is mounted in the outdoor airstream after the preheater to turn the preheater on. See Frost Control Application/ Operation for typical set points. If the temperature falls below the set point and the wheel pressure drop sensor is triggered, the preheater will turn on.

Access to the preheater control panel is through the outdoor air filter door.

Energy Recovery Ventilator

Installation

Dimensional Data

D A

Exhaust Air

Weatherhood

Electrical Box

RA Intake

SA Discharge

EA Discharge

OA Intake

RA Intake

SA Discharge

OA Intake

2-inch Filters

Energy Wheel

Outdoor Air

Weatherhood

2-inch Filters

Unit Dimensions

Unit Size A

ERVe-20 67.0 50.8 46.3 17.8 20.8

ERVe-35 69.2 60.8 54.4 21.8 17.8

ERVe-45 72.2 67.1 60.2 21.8 19.2

ERVe-55 84.1 75.3 71.4 21.8 23.9

All dimensions are in inches. Door handles, hinges and other protrusions are not included in the dimensions above. Dimensions are rounded up to the nearest .1 inch.

BCDE

Duct Dimensions

Unit Size A

ERVe-20 11.8

ERVe-35 13.1

ERVe-45 15.8

ERVe-55 18.6

BCD

18.0 12.2 10.7 15.8 18.0 10.8 25.8

20.5 13.7 11.9 21.5 20.5 15.8 27.8

22.5 16.1 14.0 24.5 22.5 18.8 29.1

26.0 19.2 16.4 28.0 26.0 23.8 34.8

FGH

All dimensions are in inches.

Intake and Discharge Options

Unit Size Bottom

Top Side End

ERVe-20 X

ERVe-35 X X

ERVe-45 X X

ERVe-55 X

OA - Outdoor Air SA - Supply Air (to the space) RA - Return Air (from the space) EA - Exhaust Air

Energy Recovery Ventilator

Recommended Roof Opening & Weights

CLEARANCE

Service Clearances

1.63

Approx.

Weight (lbs.)

EXHAUST

INLET

SUPPLY OUTLET

Unit Size A B

ERVe-20 22 37 825

ERVe-35 25 44.5 1100

ERVe-45 27 51.5 1275

ERVe-55 27 60 1550

All dimensions are in inches. These weights include sheet metal weights added together with the largest motors, blowers and accessories for the units.

Position the unit roof opening such that the supply discharge and exhaust inlet of the unit will line up with the corresponding ductwork. Be sure to allow for the recommended service clearances when positioning opening (see Service Clearances). Do not face the outdoor air intake of the unit into prevailing wind and keep the intake away from any other exhaust fans. Likewise, position the exhaust discharge opening away from outdoor air intakes of any other equipment.

When cutting only duct openings, cut opening 1-inch (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 5. If area within curb is open, higher radiated sound levels may result.

Where the supply or warm air duct passes thru a combustible roof, a clearance of one inch must be maintained between the outside edges of the duct and combustible material in accordance with NFPA Standard 90A.

ERVe units require minimum clearances to perform routine maintenance, such as filter replacement, energy wheel cassette inspection, and fan belt adjustment. Blower and motor assemblies, energy recovery wheel cassette and filter sections are always provided with a service door or panel for proper component access.

Recommended Service Clearances

Unit Size A B C D

ERVe-20 24 24 42 35

ERVe-35 32 24 48 43

ERVe-45 32 24 54 43

ERVe-55 32 24 60 44

All dimensions are in inches.

Access Panel Description and Location

Outdoor air filters Frost control

Outdoor air sensors Preheater and controls Outdoor air intake damper

Supply blower and motor

Electric control center Main disconnect

Energy wheel cassette

Exhaust air filters Exhaust air intake damper

Exhaust blower and motor Outdoor air intake damper actuator

Energy Recovery Ventilator

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.

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

WARNING

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

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

2. To assist in determining rigging requirements, weights are shown below.

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

4. Rigger to use suitable mating hardware to attach to unit corner lifting points.

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

Roof Curb Mounting

Roof curb details including duct location dimensions, are available on Roof Curb Assembly Instructions, Part Number 472119.

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

1. Factory Supplied Roof Curbs: Roof curbs are Model GKD. The GKD ships in a knockdown kit (includes duct adapter) and requires ﬁeld assembly (by others). Assembly instructions are included with the GKD curbs.

2. Install Curb: Locate curb over roof opening and fasten in place. (Refer to Recommended Roof Openings). Check that the diagonal dimensions are within ±1/8 inch of each other and adjust as necessary. For proper unit operation, it is important that the installation be level. Shim as required to level.

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

4. Install Insulation: One-inch deep insulation pans were provided with the curb assembly. Install insulation prior to setting the unit. Insulation is not included from the factory.

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

Curb Outside Dimensions and Weights

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.

Energy Recovery Ventilator

Unit Size L W LF WF

ERVe-20 61.125 40.375 64.875 44.125 93

ERVe-35 63.375 48.5 67.125 52.25 106

ERVe-45 67.375 55.5 71.125 59.25 120

ERVe-55 78.25 65.5 82 69.188 148

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

Curb Weight

(lbs.)

Curb Outside Dimensions - continued

POOR

Unit Side

1.895

4.844

Roof Curb

1.549

0.775

Unit Base

Insulation Pan

(Insulation not included)

Curb Cap Details for Factory Supplied Roof Curbs

Ductwork Connections

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

Rail Mounting / Layout

1. Rails designed to handle the weight of the ERVe 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 ERVe unit. Avoid area dimensioned “B” below.

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

4. Set unit on rails.

Isometric view of

ERVe on rails

Length of Straight Duct

GOOD

Recommended Discharge Duct Size and Length

Model Blower Size Duct Size Straight Duct Length

ERVe-20 9 14 x 14 36

ERVe-35 10 20 x 20 36

ERVe-45 12 20 x 20 36

ERVe-55 15 28 x 28 60

All dimensions shown in inches.

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

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

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

Side view of

ERVe on rails

Unit Size A

ERVe-20 5.75 18

ERVe-35 5.75 20.5

ERVe-45 6 22.5

ERVe-55 6 26

All dimensions are in inches.

Energy Recovery Ventilator

Outdoor Air Weatherhood

Outdoor air weatherhood will be factory mounted.

Exhaust Weatherhood

The exhaust weatherhood is shipped separately as a kit with its own instructions.

Dampers

Backdraft dampers are always included as an integral part of the exhaust hood assemblies. Motorized outdoor air and exhaust air dampers are optional. Outdoor air dampers are factory mounted and wired at the intake. Exhaust air dampers, depending on the unit configuration, may require final installation. If your unit is configured as return air intake on the end of the unit, the exhaust air damper is factory installed and wired. If your unit is configured with the return air intake location on the bottom, final installation is required per the instructions provided.

Exhaust Air Damper Installation

(Bottom return air intake conﬁguration only)

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

2. Remove exhaust air filters and possibly the energy wheel for more working area inside the unit.

3. Remove the two screws holding the damper in place as shown (save screws for step 7).

4. Bend the brackets holding the damper out and away from the damper as shown in the Part Removal drawing. Use caution while executing this step, as the damper is heavy. Guide it into place gently and avoid dropping it, as damage may occur.

5. Once the damper is positioned as shown in the Part Removal drawing, remove the four (4) screws holding the shipping brackets in place.

6. Remove the shipping brackets and discard.

7. Insert screws removed in step 3 through the damper flange in the same location they were removed from.

Shipping Location

Step 4

Step 5

Step 4

Part Removal

Final Installation

Electrical Information

The unit must be electrically grounded in accordance with the current National Electrical Code, ANSI/NFPA

70. In Canada, use current CSA Standard C22.1, Canadian Electrical Code, Part 1. In addition, the installer should be aware of any local ordinances or electrical company requirements that might apply. System power wiring must be properly fused and conform to the local and national electrical codes. System power wiring is to the unit main disconnect (door interlocking disconnect switch standard on most units) or distribution block and must be compatible with the ratings on the nameplate: supply power voltage, phase, and amperage (Minimum Circuit Amps - MCA, Maximum Overcurrent Protection

- MOP). All wiring beyond this point has been done by the manufacturer and cannot be modified without affecting the unit’s agency / safety certification.

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

If power supply is desired through bottom of unit, run the wiring through the curb, cut a hole in the cabinet bottom, and wire to the disconnect switch. Seal penetration in cabinet bottom to prevent leakage.

The electric supply to the unit must meet stringent requirements for the system to operate properly. Voltage supply and voltage imbalance between phases should be within the following tolerances. If the power is not within these voltage tolerances, contact the power company prior to operating the system.

Voltage Supply: See voltage use range on the rating plate. Measure and record each supply leg voltage at all line disconnect switches. Readings must fall within the allowable range on the rating plate.

Voltage Imbalance: In a 3-phase system, excessive voltage imbalance between phases will cause motors to overheat and eventually fail. Maximum allowable imbalance is 2%. To determine voltage imbalance, use recorded voltage measurements in this formula.

Key: V1, V2, V3 = line voltages as measured

VA (average) = (V1 + V2 + V3) / 3

VD = Line voltage (V1, V2 or V3) that deviates farthest from average (VA)

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

Energy Recovery Ventilator

CAUTION

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

CAUTION

High voltage wiring is run in the top roof panel(s) of this unit. Do not install sensors or other devices through the top panel(s).

Typical Control Center Components

1. Main Disconnect (non-fusible, lockable)

2. Motor Starter – Exhaust Air Fan

3. Motor Starter – Outdoor Air Fan

4. Motor Contactor – Energy Wheel

5. 24 VAC Control Transformer

6. 24 VAC Terminal strip

7. Fuses for blower motors

WARNING

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

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

0.75ohms.

Refer to Field Control Wiring Length/Gauge table for wire length maximums for a given wire gauge.

Field Control Wiring Length/Gauge

Total

Wire Length

125 ft. 18 200 ft. 16 300 ft. 14 450 ft. 12

Minimum

Wire Gauge

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

If wire resistance exceeds 0.75 ohms, an industrialstyle, plug-in relay should be added to the unit control center and wired in place of the remote switch (typically between terminal blocks R and G on the terminal strip (refer to Typical Control Center Components). The relay must be rated for at least 5 amps and have a 24 VAC coil. Failure to comply with these guidelines may cause motor starters to “chatter” or not pull in which can cause contactor failures and/or motor failures.

2 3 4

Exploded Detail

of Terminal Strip

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

• Hand/off/auto switch

• Dirty ﬁlter light

• Economizer light

• Frost control light

• Wheel rotation sensor light

Unit Interfacing Terminals

Heating/Cooling Switches & 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.

Energy Recovery Ventilator

DIRTY FILTER

Unit Overview

Optional Component Overview

Basic Unit

The ERVe units are prewired such that when a call for outside air is made (via field supplied 24 VAC control signal wired to unit control center), the supply fan, exhaust fan and energy wheel are energized and optional motorized dampers open. The ERVe is normally slaved (24 volt) to the roof top air handler. When the roof top air handler starts, the auxiliary contactor in the air handler closes to start the ERVe.

Summer Operation

Outdoor air is preconditioned (temperature and moisture levels are decreased) by the transfer of energy from the cooler, drier exhaust air via the energy recovery wheel. The preconditioned air is typically mixed with return air going back to the air handler for final conditioning.

Room Air

75° F

50% RH

Exhaust Air

Supply Air

Outdoor Air

95° F

117 grains/lb.

79° F

75 grains/lb.

Winter Operation

Outdoor air is preconditioned (temperature and moisture levels are increased) by the transfer of energy from the warmer, more humid exhaust air via the energy recovery wheel. The preconditioned air is typically mixed with return air going back to the air handler for final conditioning.

Room Air

72° F

40% RH

Exhaust Air

Economizer

The energy wheel operation can be altered to take advantage of economizer operation (free cooling). Two modes are available:

1. Stopping the wheel

2. Modulating the wheel

Stopping the wheel: A field-supplied call for cool (Y1) is required. De-energizing the wheel is accomplished one of three ways:

1. The outdoor air temperature is less than the outdoor dry bulb set point (DRYBLB SET)

2. The outdoor air temperature is less than the return air temperature

3. The outdoor air enthalpy is within the preset enthalpy curve

A low temperature lock out (LOW T LOCK) is also set to deactivate mechanical cooling when it exceeds the outdoor air temperature (factory default 32ºF). Effectively, the two sensors create a deadband where the energy recovery wheel will not operate and free cooling from outside can be brought into the building unconditioned.

Modulating the wheel (factory): A variable frequency drive is fully programmed at the factory. A “call for cool” must be field wired to the unit (terminals provided in unit-refer to wiring diagram in unit control center) to allow for initiation of economizer mode. The unit recognizes economizer conditions based one of the previously mention sensors and set points. The unit will then modulate the wheel speed to maintain the mixed air temperature set point (MAT SET).

Modulating the wheel (by others): A variable frequency drive is fully programmed at the factory. A field-supplied 0-10 VDC signal will be required for operation of the energy wheel. The field will be required to have full control of the energy wheel speed at all times. If no 0-10 VDC signal is provided, the energy wheel will run at the factory default of 3 Hz and no energy transfer will be captured.

Outdoor Air

10° F

5 grains/lb.

Supply Air

60° F

39 grains/lb.

Energy Recovery Ventilator

Frost Control

Extremely cold outdoor air temperatures can cause moisture condensation and frosting on the energy recovery wheel. Frost control is an optional feature that will prevent/control wheel frosting. Three options are available:

1. Timed exhaust frost control

2. Electric preheat frost control

3. Modulating wheel frost control

All of these options are provided with a thermodisc mounted in the outdoor air intake compartment and a pressure sensor to monitor pressure drop across the energy wheel.

An outdoor air temperature of below 5ºF and an increase in pressure drop would indicate that frost is occurring. Both the pressure sensor and the outdoor air thermodisc must trigger in order to initiate frost control. The two sensors together ensure that frost control is only initiated during a real frost condition.

Timed exhaust frost control includes a timer in addition to the thermodisc and wheel pressure sensor. When timed exhaust frost control is initiated, the timer will turn the supply blower off. Time exhaust using default timer setting will shut down the supply fan for 5 minutes every 30 minutes to allow exhaust to defrost energy wheel. Use the test procedure in the Optional Start-Up Accessories section for troubleshooting.

Electric preheat frost control includes an electric heater (at outdoor air intake) in addition to the thermodisc and pressure sensor on wheel. When electric preheat frost control is initiated, the electric preheater will turn on and warm the air entering the energy wheel to avoid frosting. Use the test procedure in the Optional Start-Up Accessories section for troubleshooting.

Modulating wheel frost control includes a variable frequency drive (VFD) in addition to the thermodisc and pressure sensor. When modulating wheel frost control is initiated, the VFD will reduce the speed of the wheel. Reducing the speed of the energy wheel reduces its effectiveness, which keeps the exhaust air condition from reaching saturation, thus, eliminating condensation and frosting. If the outdoor air temperature is greater than the frost threshold temperature OR the pressure differential is less than the set point, the wheel will run at full speed. If the outdoor air temperature is less than 5ºF AND the pressure differential is greater than the set point, the wheel will run at reduced speed until the pressure differential falls below the set point. The VFD will be fully programmed at the factory.

Variable Frequency Drives (VFD)

VFDs are used to control the speed of the fan as either multi-speed or modulating control. Multispeed 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 sensor is available to provide both a set point contact or a modulating 2-10 VDC signal.

CO2 Sensor

This accessory is often used in Demand Control Ventilation (VDC) 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.

Rotation Sensor

The rotation sensor monitors energy wheel rotation. If the wheel should stop rotating, the sensor will close a set of contacts in the unit control center. Field-wiring of a light (or other alarm) between terminals R and 12 in the unit control center will notify maintenance personnel when a failure has occurred.

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.

Energy Recovery Ventilator

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.

WARNING

Use caution when removing access panels or other unit components, especially while standing on a ladder or other potentially unsteady base. Access panels and unit components can be heavy and serious injury may occur.

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

CAUTION

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

 Rotate the fan wheels and energy recovery wheels

by hand and ensure no parts are rubbing. If rubbing occurs, refer to Start-Up section for more information.

 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 factory wiring

connections.

 Verify control wire gauge (refer to the Electrical

Connections section).

 Verify diameter seal settings on the energy

recovery wheel (refer to Start-Up section for more information).

 Install exhaust inlet motorized damper (see Unit

Accessories section)

SPECIAL TOOLS REQUIRED

General Start-Up Information

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

Unit Model Number _______________________________

(e.g. ERVe-20)

Unit Serial Number _______________________________

(e.g. 10111000)

Energy Wheel Date Code __________________________

(e.g. 0450)

Start-Up Date _______________________________

Start-Up Personnel Name __________________________

Start-Up Company _______________________________

Phone Number _______________________________

Pre Start-Up Checklist – check as items are

completed.

 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.

• Voltage Meter (with wire probes)

• Amperage Meter

• Thermometer

• Tachometer

• Incline manometer or equivalent

Start-Up Checklist

The unit will be in operational mode during start-up. Use necessary precautions to avoid injury. All data must be collected while the unit is running. In order to measure volts & amps, the control center door must be open, and the unit energized using a crescent wrench to turn the disconnect handle.

Check line voltage at unit disconnect _______ L1-L2 volts _______ L2-L3 volts _______ L1-L3 volts

Motor Amp Draw

• Supply Fan • Exhaust Fan

_______ L1 amps ______ L1 amps _______ L2 amps ______ L2 amps _______ L3 amps ______ L3 amps

• Energy Wheel

_______ L1 amps _______ L2 amps _______ L3 amps

Fan RPM _______ Supply Fan ______ Exhaust Fan

Correct fan rotation direction Supply Fan Yes / No Exhaust Fan Yes / No

Energy Recovery Ventilator

Optional Accessories Checklist

Refer to the respective sections in this Installation, Operation and Maintenance Manual for detailed information.

Refer to wiring diagram in unit control center to determine what electrical accessories were provided.

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

Yes No Frost Control set point 5ºF

Differential 2ºF Timer Refer to IOM

Yes No Frost Control Modulating Refer to IOM

Economizer Application / Operation section:

Yes No Economizer (temperature)

Set point 65ºF

Offset 20ºF

Differential 2ºF

Yes No Economizer (enthalpy)

Set point D

Yes No Economizer (modulating) Refer to IOM

Optional Accessories section: Operational

Yes No Wheel Rotation Sensor Yes No N/A

Yes No OA Dirty Filter Sensor Yes No N/A

Yes No EA Dirty Filter Sensor Yes No N/A

Yes No C O

Sensor Yes No N/A

Yes No Service Outlet Yes No N/A

Yes No Remote Control Panel Yes No N/A

Variable Frequency Drives section: Operational

Yes No Blower VFDs Yes No N/A

Yes No Wheel VFD Yes No N/A

Damper section: Operational

Yes No Outdoor Air Damper Yes No N/A

Yes No Exhaust Air Damper Yes No N/A

Energy Recovery Ventilator

Start-Up Components

Fans

The ERVe models contain two forward curved (supply & exhaust) fans. These forward curved fans should be checked for free rotation. If any binding occurs, check for concealed damage and foreign objects in the fan housing. Be sure to check the belt drives per the start-up recommendations in the following section.

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

belts, as this could result in damage to the cords in the belts.

6. With the fan off, adjust the belt tension by moving

the motor base. (See belt tensioning procedures in the Routine Maintenance section of this manual). When in operation, the tight side of the belts should be in a straight line from sheave to sheave with a slight bow on the slack side.

Forward Curved

Exhaust Fan

CAUTION

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

Fan Performance Modiﬁcations

Due to job specification revisions, it may be necessary to adjust or change the sheave or pulley to obtain the desired airflow at the time of installation. Start-up technician must check blower amperage to ensure that the amperage listed on the motor nameplate is not exceeded. Amperage to be tested with access doors closed and ductwork installed.

Fan Belt Drives

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

• Fan Shaft • Bearings • Motor

• Fan Wheel • Belt

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

Belt Drive Installation

1. Remove the protective coating from the end of the fan shaft and assure that it is free of nicks and burrs.

2. Check fan and motor shafts for parallel and angular alignment.

3. Slide sheaves on shafts. Do not drive sheaves on as this may result in bearing damage.

4. Align fan and motor sheaves with a straight-edge or string and tighten.

WRONG WRONG

WRONG CORRECT

Direction of Fan Wheel Rotation

Blower access is labeled on unit. Check for proper wheel rotation by momentarily energizing the fan. Rotation is determined by viewing the wheel from the drive side and should match the rotation decal affixed to the fan housing (see Rotation Direction figures). If the wheel is rotating the wrong way, direction can be reversed by interchanging any two of the three electrical leads.

Check for unusual noise, vibration, or overheating of bearings. Refer to the Troubleshooting section of this manual if a problem develops.

Airﬂow

Forward Curved

Fan RPM

Supply fan and exhaust fan will have an adjustable motor pulley (on 15 HP and below) preset at the factory to the customer specified RPM. Fan speed can be increased or decreased by adjusting the pitch diameter of the motor pulley. 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. Do not operate units with access doors open or

without proper ductwork in place as the fan motors will overload.

Energy Recovery Ventilator

Vibration

Excessive vibration may be experienced during initial start-up. Left unchecked, excessive vibration can cause a multitude of problems, including structural and/or component failure. The most common sources of vibration are listed.

Many of these conditions can be discovered by

careful observation.

Wheel Unbalance Drive Pulley Misalignment Incorrect Belt Tension Bearing Misalignment Mechanical Looseness Faulty Belts Drive Component Unbalance Poor Inlet/Outlet Conditions Foundation Stiffness

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.

Energy Recovery Wheel

The ERVe models contain a total energy recovery wheel. The wheels are inspected for proper mechanical operation at the factory. However, during shipping and handling, shifting can occur that may affect wheel operation. The wheel is accessible through the access door marked “Energy Wheel Cassette Access”.

Turn the energy recovery wheels by hand to verify free operation. The wheel should rotate smoothly and should not wobble.

Inside layout of ERVe

Drive Belt

Inspect the drive belt. Make sure the belt rides smoothly through the pulley and over the wheel rim.

Air Seals

Check that the air seals located around the outside of the wheel and across the center (both sides of wheel) are secure and in good condition. Air seal clearance is determined by placing a sheet of paper, to act as a feeler gauge, against the wheel face. To access seals, follow the instructions in the Energy Recovery Wheel Maintenance section. To adjust the air seals, loosen all eight seal retaining screws. These screws are located on the bearing support that spans the length of the cassette through the wheel center. Tighten the screws so the air seals tug slightly on the sheet of paper.

Replace cassette into unit, plug in wheel drive, replace access door and apply power. Observe by opening door slightly (remove filters if necessary to view wheel) the wheel should rotate freely at about 20-40 RPM.

Optional Start-Up Components

Dirty Filter Switch

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

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

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.

Adjustable

Air Seals

Drive Belt

Drive Pulley

Energy Recovery Ventilator

Bearing Support

Label showing cassette

serial #

and date

code

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).

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.

Economizer

Relevant Set Points

1. MAT SET The mixed air temperature set point after the energy wheel. The control will modulate the energy wheel to maintain temperature as best as it can. (Set point menu, default 53°F )

2. LOW T LOCK The set point for the low temperature mechanical cooling lockout. (Set point menu, default 32°F)

3. DRYBLB SET The outdoor air set point to call for economizer. (Set point menu, default 63°F)

4. MIN POS The minimum signal voltage sent to the energy wheel. This must be set to 2 VDC. (Set point menu, default 2.8 VDC)

5. AUX1 O The controllers operating sequence structure. (Set point menu, default ‘None’)

6. ERV OAT SP The set point for low temperature economizer lockout. This is the low temperature set point when AUX1 O is set to ERV. (Set point menu, default 32°F)

7. STG3 DLY Time delay after second cooling stage is enabled (Advanced setup menu, default 2hrs.)

Using the Keypad with Settings and Parameters

To use the keypad when working with Set points, System and Advanced Settings, Checkout tests, and Alarms:

1. Navigate to the desired menu.

2. Press currently displayed menu.

3. Use the and buttons to scroll to the desired parameter.

4. Press currently displayed item.

5. Press the button to increase (change) the displayed parameter value.*

6. Press the displayed parameter value.*

7. Press (enter) to accept the displayed value and store it in non-volatile RAM.

8. CHANGE STORED displays.

9. Press parameter.

10. Press parameter.

* When values are displayed, pressing and holding the or button causes the display to automatically increment.

(enter) to display the ﬁrst item in the

(enter) to display the value of the

button to increase (change) the

(enter) to return the current menu

(escape) to return to the current menu

The table shows which set points are relevant to the given sequences. Refer to the wiring diagram for the units’s sequence.

MODULATE WHEEL STOP WHEEL

Temp

Enthalpy

DRYBLB SET X X

MAT SET X X X X X X

LOW T LOCK X X X X X X

ERV OAT SP X X X

MIN POS X X X

AUX1 OUT ERV ERV ERV

STG3 DLY X X X X X X

OA/RA

Temp

Differential

Temp

Enthalpy

OA/RA

Temp

Differential

Stop Wheel

1. Navigate to the Checkout menu and press (enter).

2. The energy wheel and cooling should stop.

3. Navigate to Connect ERV and press (enter) twice to run the test.

4. Voltage between AUX1-O and C should be 24 VAC. The energy wheel should activate.

Modulate Wheel

1. Navigate to the Checkout menu and press (Enter).

2. The cooling should turn off and the wheel should be rotating at full speed.

3. Navigate to Damper Open and press twice to run the test.

4. Voltage between terminals ACT 2-10 and ACT COM should be 10 VDC. This will slow the wheel down to minimum speed.

5. Press

(escape), navigate to Damper Close and

press (enter) twice to run the test.

6. Voltage between terminal ACT 2-10 and ACT COM should be 2 VDC. This will speed the wheel up to maximum speed.

(enter)

Energy Recovery Ventilator

Frost Control

Timed Exhaust

1. Remove power from unit.

2. Jumper the frost indicating wheel pressure switch in the unit control center.

3. Jumper the temperature indicating thermodisc in the unit control center. Thermodisc has a pre-set temperature of 5ºF.

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

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

6. Remove power from unit and remove jumpers that were placed. Re-set timer settings.

• T1 timer setting set to 5 and

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

Timer Scale

Timer

Settings

Timer Scale

• T2 timer setting set to 5 and

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

Electric Preheat

1. Remove power from unit.

2. Jumper the frost indicating wheel pressure switch in the preheat control center.

3. Jumper the temperature indicating thermodisc in the preheat control center. Thermodisc has a preset temperature of 5º F.

4. Apply power to unit. Preheater should turn on.

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

V1000

OPTION 1 - 0-10 VDC CONTROL

USER TO PROVIDE ISOLATION AS REQUIRED

A1 AC

SEE VFD INSTALLATION MANUAL FOR MORE DETAIL

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

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

J1000

MA MB MCACAMAC+VA1SCS5S4S3S2S1

Energy Recovery Ventilator

OPTION 2 - MULTI SPEED CONTROL

USER TO PROVIDE CONTACTS AND ISOLATION AS REQUIRED

S5S4 SC

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

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.

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 60 Hz

• Multi-speed: Digital contact closures by others command the VFD to run at multiple speed settings: ż Open - Drive runs at 60 Hz

ż SC to S4 - Drive runs at 40 Hz

ż SC to S5 - Drive runs at 30 Hz

• CO

Sensor:

ż 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 CO

= 50% fan speed and

800 PPM or greater CO2 = 100% fan speed.

ż 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 CO2 = 50% fan speed and 1000 PPM or greater CO2 = 100% fan speed. Modulation of VFD occurs proportional to CO

between 500 and 1000PPM.

The terminal locations for modulating and multispeed 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

ż SC to S1 contact for On/Off

ż 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.

MODULATING CONTROL FOR FAN SPEED

(0-10 VDC)

Parameter

Setting

V1000 J1000 A1-01 Access Level 2 2 B1-17 VFD Start-Up Setting 1 1 C6-02 Carrier Frequency 1 1 D2-02 Ref Lower Limit 50% 50%

E2-01 Motor Rated FLA

Motor

FLA

Motor

FLA H2-01 Terminal MA, MC Function 5 5 H3-04 Terminal A1 Bias 50% 50%

L4-01 H2-01 Frequency Detection 15 15 L5-01 Auto Restart Attempt 5 5

A1-01 Access Level 0 0

CO2 SENSOR CONTROL FOR FAN SPEED

(1/2 SPEED WHEN CO2 DROPS BELOW 700 PPM)

(FULL SPEED WHEN CO2 RISES ABOVE 800 PPM)

MULTI-SPEED CONTROL FOR FAN SPEED

(1/3 OR 1/2 SPEED REDUCTION)

Parameter

Setting

V1000 J1000

A1-01 Access Level 2 2

B1-01

Reference Source

(Frequency)

B1-17 VFD Start-Up Setting 1 1 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 Iw D2-02 Ref Lower Limit 50% 50%

E2-01 Motor Rated FLA

H1-04

H1-05

H1-06

Multi-Function Input Sel 4

(Terminal S4)

Multi-Function Input Sel 5

(Terminal S5)

Multi-Function Input Sel 6

(Terminal S6)

Motor

FLA

Motor

FLA

5NA

H2-01 Terminal MA, MC Function 5 5 H3-10 A2 Not Used F NA

L4-01 H2-01 Frequency Detection 15 15 L5-01 Auto Restart Attempt 5 5

A1-01 Access Level 0 0

Energy Recovery Ventilator

CO2 PROPORTIONAL CONTROL

Parameter

Setting

V1000 J1000

B1-17 VFD Start-Up Setting 1 1

C6-02 Carrier Frequency 1 1

D2-02 Ref Lower Limit 50% 50% E2-01 Motor Rated FLA FLA FLA

H3-03

H3-04

Analog Frequency

Reference (Gain)

Analog Frequency

Reference (Bias)

150% 150%

25% 25%

L2-01 Ride Thru Power Loss 2 2 L4-05 Frequency Ref Loss 0 NA

L5-01 Auto Restart Attempt 5 5

A1-01 Access Level 0 0

VARIABLE FREQUENCY DRIVES

FOR ENERGY RECOVERY WHEEL

Parameter Setting – J1000

A1-01 Access Level 2 B1-17 VFD Auto Start 1 C1-04 Decel Time 600

*C4-01 Torque Gain 0.6

C6-02 Carrier Frequency 2 D2-01 Ref Upper Limit 40 or 50* D2-02 Ref Lower Limit 5% E2-01 Motor Rated FLA Motor FLA

E2-03 Motor No-Load Current

H1-02

H2-01

H1-04

Multi-Function Input

(Terminal S2)

Multi-Function Output

(MA, MB, MC)

Multi-Function Input Sel 4

(Terminal S4)

Economizer Signal Source

(0-10 VDC)

H3-03

H3-04

Analog Frequency

Reference (Gain)

Analog Frequency

Reference (Bias)

Must be less

than FLA

Setting

Honeywell

Module

Controller

40 or

50**

Carel

40 or

L1-01 Elect Thermal Overload 2 L2-01 Ride Thru Power Loss 2

L4-01

Frequency Detection

Level

L5-01 Auto Restart Attempt 5 A1-01 Access Level 0

* 208/230 volt only **36 through 52 inch wheels are 40 (24 Hz) 58 or 74 inch wheel is 50 (30 Hz)

50*

Energy Recovery Ventilator

Routine Maintenance

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

Energy Recovery Wheel

Check for cleanliness - clean if required Check belt for wear Check pulley, bearings, and motor

Maintenance Procedures:

Lubrication

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

Dampers

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

Fan Belts

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

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

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

The proper belt setting is the lowest tension at which the belts will not slip under peak load operation. For initial tensioning, set the belt deflection at 1/64- inch for each inch of belt span (measured halfway between sheave centers). For example, if the belt span is 64 inches, the belt deflection should be oneinch (using moderate thumb

Deflection =

Belt Span

pressure at mid-point of the drive). Check belt tension two times during the first 24hours of operation and periodically thereafter.

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 wash-down motor with high pressure spray. Greasing of motors is only intended when fittings are provided. Many fractional motors are permanently lubricated for life and require no further lubrication.

Energy Recovery Ventilator

Fan Wheel & Fasteners

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

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

Bearings

Most bearings are permanently lubricated and require no further lubrication under normal use. Normal use being considered -20ºF to 120ºF and in a relatively clean environment. Some bearings are 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.

Pleated Filter Size and Quantities

Unit Size

ERVe-20 20 x 20 2 20 x 20 2

ERVe-35 16 x 20 3 16 x 25 3

ERVe-45 20 x 25 3 20 x 25 3

ERVe-55 16 x 20 6 16 x 20 6

All dimensions in inches.

Supply Exhaust

Size Qty Supply Exhaust

Outdoor Air Filters: Access to the outdoor air filters is through the door labeled as “Filter Access” on the outdoor air side of the unit.

Exhaust Air Filters: Access to the exhaust air filters is through the door labeled as “Filter Access” on the exhaust air side of the unit.

Refer to Access Door Descriptions section for additional information on filter locations.

Door Seal Maintenance

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

Internal Filter Maintenance

The ERVe units are always provided with 2-inch, pleated filters in the outdoor air and exhaust airstreams. These filters should be checked per a routine maintenance schedule and replaced as necessary to ensure proper airflow through the unit. See table for pleated filter size and quantity for each unit. Replacement filters shall be of same performance and quality as factory installed filters. Filter type must be pleated design with integral metal grid. Two acceptable filter replacements are Aerostar Series 400 or Farr 30/30

Energy Recovery Ventilator

Energy Recovery Wheel Maintenance

Annual inspection of the energy recovery wheel is recommended. Units ventilating smoking lounges and other non-clean air spaces should have energy recovery wheel inspections more often based upon need. Inspections for smoke ventilation applications are recommended bimonthly to quarterly until a regular schedule can be established.

Accessing the Energy Recovery Wheel

Disconnect power to the ERVe. Open door labeled “Energy Wheel Cassette Access”.

Unplug the wheel drive motor.

Pull the wheel cassette halfway out.

Removing the Energy Recovery Wheel Segments (stainless steel rim)

Steel retainers are located on the inside of the wheel rim. Push the retainer towards the center of the wheel, then lift up and away to release segments.

Bracket Segment Retainer

Lift away from segment

Catch Segment Retainer

Push toward center

Important! Place retainers back in the original position before rotating the energy recovery wheel, otherwise damage to retainer will occur.

Wheel segment removed

Inside of wheel rim

Spoke

Center of Wheel

Cleaning the Energy Recovery Wheel

If the wheel appears excessively dirty, it should be cleaned to ensure maximum operating efficiency. Only excessive buildup of foreign material needs to be removed. Discoloration and staining of energy recovery wheel does not affect its performance.

Thoroughly spray wheel matrix with household cleaner such as Fantastik® or equivalent. Gently rinse with warm water and using a soft brush remove any heavier accumulation. A detergent/water solution can also be used. Avoid aggressive organic solvents, such as acetone. The energy recovery wheel segments can be soaked in the above solution overnight for stubborn dirt or accumulation.

After cleaning is complete, shake the excess water from the wheel or segments. Dry wheel or segments before placing them back into the cassette. Place wheel or segments back into cassette by reversing removal procedures.

CAUTION

Do not clean energy recovery wheel segments with water in excess of 140ºF (60ºC).

Do not dry energy recovery wheel segments in air in excess of 140ºF (60ºC).

The use of a pressure washer to clean segments is not recommended. Damage could result.

Energy Recovery Wheel Belt

Inspect belts each time filters are replaced. Belts that look chewed up or are leaving belt dust near the motor pulley may indicate a problem with the wheel. Be sure to inspect wheel for smooth and unrestricted rotation. If a belt requires replacement, contact the local Greenheck

Wheel Belt & Pulley

representative. Instructions for replacement will ship with the new belt.

Energy Recovery Wheel Bearing

In the unlikely event that a wheel bearing fails, the bearing is behind a removable plate on the wheel support beam. Contact the local Greenheck representative for detailed instructions on how to replace the bearing.

Wheel Bearing

Energy Recovery Ventilator

Troubleshooting - Economizer Alarms

Addressing Alarms

Alarms will signify a faulty sensor. When this occurs, verify all connections to the sensor and controller are secure. Press enter twice to clear the alarm. If the issue persists, consult the factory.

Clearing Alarms

Once the alarm has been identified and the cause has been removed (e.g. replaced faulty sensor), the alarm can be cleared from the display.

To clear an alarm, perform the following:

1. Navigate to the desired alarm.

2. Press the

3. ERASE? displays.

4. Press (enter).

5. ALARM ERASED displays.

6. Press return to the previous menu.

If an alarm still exists after you clear it, it redisplays within 5 seconds.

(enter).

(escape) to complete the action and

NOTE

Energy Recovery Ventilator

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

Pressure Drop Across Energy Recovery Wheel

Outdoor Air Side

Exhaust Side

Airflow problems can often be tied back to improper ductwork installation. Be sure to install ductwork in accordance with SMACNA and AMCA guidelines.

Energy Recovery Ventilator

Troubleshooting – Unit

Symptom Possible Cause Corrective Action

Blown fuse or open circuit breaker.

Defective motor or capacitor. Replace.

Replace fuse or reset circuit breaker and check amps.

Blower fails to

operate

Motor starters

“chatter” or

do not pull in

Motor over amps

Motor starter overloaded. Reset starter and check amps.

Electrical.

Drive.

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.

CFM too high. Check cfm and adjust drives if needed.

Static pressures are higher or lower than design.

Blower rotation is incorrect. Check rotation and reverse if necessary.

Motor voltage incorrect.

Motor horsepower too low.

Shorted windings in motor. Replace motor.

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

Check for broken or loose belts. Tighten loose pulleys.

Shorten wiring run to mechanical room or install a relay which will turn unit on/off. Consult Factory for relay information.

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

If higher, ductwork should be improved. If lower, fan rpm should be lower.

Check motor nameplate versus supplied voltage.

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

Low airflow (cfm)

High airflow (cfm)

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

System static pressure too high.

Blower speed too low.

Fan wheels are operating backwards.

Dirty filter or energy wheel.

Leaks in ductwork. Repair.

Elbows or other obstructions may be obstructing fan outlet.

Belt slippage. Adjust belt tension.

Blower fan speed too high.

Filter(s) not in place. Install filters.

Insufficient static pressure (Ps) (airflow resistance).

Improve ductwork to eliminate losses using good duct practices.

Check for correct drives and rpm with catalog data.

For 3-phase, see Direction of Fan Wheel Rotation under Unit Start-Up section.

Follow cleaning procedures in Routine Maintenance section.

Correct or improve ductwork.

Check for correct fan rpm. Decrease fan speed if necessary.

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

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

Energy Recovery Ventilator

Troubleshooting – Unit

Symptom Possible Cause Corrective Action

One or both

blowers turn off

intermittently and

back on after

about 2 minutes

Exhaust Only frost control sensors are tripping.

Adjust frost temperature sensor set point as needed.

Energy wheel does

NOT turn

Energy wheel runs

intermittently

Air seals are too tight.

“Economizer” sensors are operating.

No power to wheel motor.

Wheel drive belt.

VFD overload. (OL1 on readout)

Wheel motor overloads are tripping, due to rubbing between wheel and air seals.

Fan wheel rubbing on inlet.

Bearings.

Wheel out of balance. Replace or rebalance.

Loose wheel on shaft. Tighten wheel setscrew.

Loose motor or blower sheave. Tighten sheave setscrew.

See Energy Recovery Wheel under Unit Start-Up section.

Adjust temperature or enthalpy set points as needed.

Make sure wheel drive is plugged in. Verify power is available.

Check for loose or broken belts. Replace belts (consult factory).

Refer to VFD section. Compare motor amp rating to setting in VFD. Adjust accordingly.

Recheck air seals, make sure they are not too tight. See Energy Recovery Wheel under Unit Start-Up Section.

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

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

Belts too loose. Adjust belt tension after 24 hours of operation.

Excessive noise

or vibration

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

Belts too tight.

Worn belt. Replace.

Motor base or blower loose. Tighten mounting bolts.

Buildup of material on wheel. Clean wheel and housing.

Bearing and drive misaligned. Realign.

Noise being transmitted by duct.

Loosen to maintain a 3/8 inch deflection per foot of span between sheaves.

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.

Energy Recovery Ventilator