Greenheck Fan ERH-90, ERH-55, ERH-20, ERH-45 User Manual

**WARNING**

DISCONNECT AND SECURE TO THE "OFF"

POSITION ALL ELECTRICAL POWER TO THE

UNITS PRIOR TO INSPECTION OR SERVICING.

FAILURE TO COMPLY WITH THIS SAFETY

PRECAUTION COULD RESULT IN SERIOUS

INJURY OR DEATH.

**IMPORTANT**

ALL FACTORY PROVIDED LIFTING LUGS MUST

BE USED WHEN LIFTING THE UNITS. FAILURE TO COMPLY WITH THIS SAFETY PRECAUTION

COULD RESULT IN PROPERTY DAMAGE,

SERIOUS INJURY OR DEATH.

PART #459657

READ AND SAVE THESE INSTRUCTIONS

ENERGY RECOVERY UNIT

with HEATING

Models: ERH-20, 45, 55, & 90

INSTALLATION, OPERATION AND MAINTENANCE MANUAL

Heating Section

Energy Recovery Wheel

INSTALLATION SUPPLEMENT

Refer to the following Greenheck installation supplement for ERH units supplied with Indirect Gas (IG) heating:

Model PVF, Indirect Gas Fired Furnaces for Energy Recovery Units, Part #461006

GENERAL

Greenheck Energy Recovery units with Te mpering are thoroughly inspected and test run at the factory. However, damage may occur during handling and shipping. Consequently, it is important to inspect the unit for visible and concealed damage before beginning installation. Report any damage to the shipper immediately. In addition, assure all accessory items are present. Some accessory items are stored inside the unit during shipping. Care must be taken during installation to prevent damage to units.

TABLE OF CONTENTS

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . 2

General . . . . . . . . . . . . . . . . . . . . . . . . . . 2

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

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

Lifting . . . . . . . . . . . . . . . . . . . . . . . . . .3

Recommended Roof Openings . . . . . . .3

Unit Weights . . . . . . . . . . . . . . . . . . . . .3

Roof Curb Mounting . . . . . . . . . . . . . . .4

Duct Work Connections . . . . . . . . . . . . 4

Weatherhoods . . . . . . . . . . . . . . . . . . . 4

Electrical . . . . . . . . . . . . . . . . . . . . . . . .5

Service Clearances . . . . . . . . . . . . . . . . 6

Water Coil Location and Connection . . 7

Water Coil Recommendations . . . . . . . 7

Electric Heater Application/Operation .8 Frost Control Application/Operation . .9

Dirty Filter Switch Operation . . . . . . . .9

Economizer Application/Operation . . .10

Start Up Checks . . . . . . . . . . . . . . . . . . 11

Fan wheel . . . . . . . . . . . . . . . . . . . . . . 11

Fan RPM . . . . . . . . . . . . . . . . . . . . . . . 12

Energy Recovery Wheel . . . . . . . . . . . 12

Coils . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Routine Maintenance . . . . . . . . . . . 13-14

Belts . . . . . . . . . . . . . . . . . . . . . . . . . .13

Motors . . . . . . . . . . . . . . . . . . . . . . . . .13

Blower Wheel and Fasteners . . . . . . . .13

Vibration . . . . . . . . . . . . . . . . . . . . . . .14

Filters . . . . . . . . . . . . . . . . . . . . . . . . . 14

Coil Maintenance . . . . . . . . . . . . . . . . .15

Energy Recovery Wheel Maintenance .16

Accessing Energy Recovery Wheel . . .16

Removing Wheel Segments . . . . . . . .17

Cleaning Wheel Segments . . . . . . . . .17

Parts List . . . . . . . . . . . . . . . . . . . . . . . .18

Unit Trouble Shooting . . . . . . . . . . .19-20

STORAGE

When a unit is not going to be in service for an extended amount of time, certain procedures should be followed to keep the fans in proper operating condition.

• Rotate fan wheel monthly and purge grease from bearings once every three months

• Cover unit with tarp to protect from dirt and moisture (Note: do not use a black tarp as this will promote condensation)

• Energize fan motor once every three months

• Store belts flat to keep them from warping and stretching

• Store unit in location which does not have vibration

• After storage period, purge grease from fan bearings before putting fan into service

If storage of unit is in a humid, dusty or corrosive atmosphere, rotate the fan and purge the bearings once a month. Improper storage which results in damage to the unit or components will void the warranty.

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.

See page 6 for more detail on appropriate clearances.

LIFTING

Units must be lifted as it ships from the factory. All units are equipped with lifting lugs. THE USE OF ALL LIFTING LUGS IS MANDATORY WHEN LIFTING. Lifting should only be done with all access doors closed to avoid damaging the unit. To prevent damage to the unit cabinetry, use spreader bars. Spreader bars must be in position to stop cables from rubbing the frame or panels. Before hoisting into position, test lift to insure stability and balance. Avoid twisting or uneven lifting of the unit. Never lift units by weatherhoods.

The ERH 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 efficiency of 70-80%. Simply put, this unit preconditions the outdoor air to save money on heating and cooling costs. This particular unit also has a heater option available after the recovery wheel to further increase the fresh air temperature if desired.

Lift using lifting lugs and spreader bar

FIGURE 1

Unit Size Approx. Weight (lbs)

ERH-20 1000

ERH-45 1800

ERH-55 2500

ERH-90 4500

UNIT WEIGHTS (dry weights)

RECOMMENDED ROOF OPENING

BASIC OPERATION

EXHAUST

INLET

SUPPLY

OUTLET

Model U V

ERH-20 46 37

ERH-45 54 39

ERH-55 65 47

ERH-90 85 49

Dimensions shown are in inches.

FIGURE 2

TABLE 2

TABLE 1

Outdoor Air

Exhaust Air discharged outside

Exhaust Air from building

Preconditioned Air sent to conditioning system

Optional Heater

Energy Recovery Wheel

Length of Straight Duct

GOOD

POOR

FIGURE 4

DUCT WORK CONNECTIONS

Examples of good and poor fan-to-duct connections are shown below (See FIGURE 4). 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.

1. Factory Supplied Roof Curbs

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

2. Cut Roof Opening and Locate Curb

Layout the unit roof opening such that the supply discharge & exhaust inlet of the unit will line up with the corresponding ductwork (refer to Recommended Roof Openings on page 3). Be sure to allow for the recommended service clearances. Keep the supply inlet of the unit away from any other exhaust fans.

3. 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. Shim as required to level. Lower unit onto curb by following the LIFTING instructions on page 3 of this manual. Note, roof curbs fit inside the unit base.

4. Install Duct Work

Installation of all ducts should be done in accordance with SMACNA and AMCA guidelines.

Model L W

ERH-20 73 51

ERH-45 80.75 60.63

ERH-55 94 71.5

ERH-90 106.25 90.75

ROOF CURB MOUNTING

Curb Outside Dimensions

Dimensions shown are in inches.

FIGURE 3

Roof curb details, including duct location dimensions, are available on ERH roof curb submittals.

Recommended Discharge

Duct Size and Length

ERH

Duct

Straight

Model

Blower

Size

Duct

Size Length

20 10 14 x 14 40 45 12 20 x 20 48 55 15 28 x 28 60 90 18 32 x 32 72

Dimensions shown are in inches.

TABLE 3

TABLE 4

Main Disconnect

Off

Exhaust

Hood

Control Center

Intake

Hood

INSTALLATION (continued)

WEATHERHOODS

Supply weatherhood will be factory mounted. The exhaust weatherhood is shipped separately as a kit with its own instructions.

EXHAUST DAMPERS

Backdraft dampers for exhaust discharge are mounted in the unit. Motorized dampers are shipped loose (inside ERH) and must be field installed.

ELECTRICAL CONNECTIONS

The electrical supply must be compatible with that shown on the nameplate: voltage, phase, and amperage capacity. The electrical supply line must be properly fused and conform to local and national electrical codes.

All internal electrical components are pre-wired at the factory. Field electrical connections only need to be made inside the unit to the main disconnect (See FIGURE 5, Item #1) and the 24 volt control circuit (See FIGURE 5, Item #7). A door interlocking safety disconnect is provided as standard feature.

Note: Standard factory installed electric post heaters have their own disconnect separate from the unit

disconnect. Thus, electric post heaters require a separate power connection.

IMPORTANT: Use minimum 14 ga. wire for 24 volt control power.

Control wire resistance should not exceed 0.75 ohms (approximately 285 feet total length for 14 ga. wire; 455 feet total length for 12 ga. wire). If wire resistance exceeds 0.75 ohms, an industrial-style, plug-in relay should be added to the unit control center and wired in place of the remote switch (between terminal blocks 2 and 3 on the control strip — See FIGURE 5, Item #7). 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.

1. Main Disconnect

2. Motor Starter — Exhaust/Scavenger Air Fan

3. Motor Starter — Outdoor Air Fan

4. Motor Contactor — Energy Wheel

5. Control Power Transformer (24 VAC Secondary)

6. Energy Wheel Motor Transformer (230 VAC Secondary) (for ERH-20 & ERH-45 units with primary voltage greater than 230 Vac)

7. 24 VAC Terminal strip

8. Fuses for the control circuit, wheel drive transformer, and blower motors.

TYPICAL CONTROL CENTER COMPONENTS

FIGURE 5

Wheel Cassette

2 in. filters

Exhaust Air

Intake

Electrical Box

Access Panel

Cassette

Slides Out

52 in.

Clearance with

IG Heater

0 in.

Clearance without

IG Heater

Exhaust

Hood

Outdoor Air Hood

IG Heater

*48 in. **64 in.

36 in.

TOP VIEW

SERVICE CLEARANCES / ACCESS PANEL LOCATIONS for Model ERH

ERH-20, 45, 55, 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 FIGURES 6 and 7 below for these dimensions.

FIGURE 6

Wheel Cassette

2 in. filters

Exhaust Air

Intake

Electrical Box

Access Panel

52 in.

Clearance with

IG Heater

0 in.

Clearance without

IG Heater

Exhaust

Hood

Outdoor Air Hood

IG Heater

42 in.

TOP VIEW

FIGURE 7

Clearances for service and component removal on ERH-20 and ERH-45

*Clearance for energy wheel removal on ERH-20. **Clearance for energy wheel removal on ERH-45.

Clearances for service on ERH-55 and ERH-90

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