Greenheck ERT-52 Installation, Operation And Maintenance Manual

Energy recovery unit with tempering

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PART #460945

ENERGY RECOVERY UNIT

WITH TEMPERING

Models:

ERT-52, 58, 64 & 74

ERCH-20, 45, 55 & 90

INSTALLATION, OPERATION AND MAINTENANCE MANUAL

RECEIVING AND HANDLING

The ERT/ERCH is thoroughly inspected and test run at the factory. However, damage may

occur during shipping and handling. Upon delivery, inspect the unit for both obvious and hidden

damage. If damage is found, record all necessary information on the bill of lading and file a claim

with the final carrier. In addition, ensure all accessory items are present. Some accessory items

are stored inside the unit during shipping.

SAFETY WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage,

injury or death. Read this installation, operation, and maintenance manual thoroughly before

installing or servicing this equipment. Installation and service must be performed by a qualified

installer, service agency, or the gas supplier.

INSTALLATION SUPPLEMENTS

SAVE THIS MANUAL

This manual is the property of the

Refer to the following installation supplements

owner, and is required for future

maintenance. This manual should

ERCH supplied with Indirect Gas (IG) heating:

remain with each ERT/ERCH unit when

Model PVF, Indirect Gas Fired Furnaces

the job is complete.

for Energy Recovery Units, Part #461006

ERT Curb Assembly Instruction, Part #457157

ERCH Curb Assembly Instruction, Part #460922

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Summary of Contents for Greenheck ERT-52

Page 1 PART #460945 ENERGY RECOVERY UNIT WITH TEMPERING ® Models: ERT-52, 58, 64 & 74 ERCH-20, 45, 55 & 90 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RECEIVING AND HANDLING The ERT/ERCH is thoroughly inspected and test run at the factory. However, damage may occur during shipping and handling.
Page 2 TABLE OF CONTENTS Storage and Basic Operation . . . . . . . . . . . . . . Sensors Mounted by Factory . . . . . . . . . . . . . 4 Installation .
Page 3 11) Do not use fork lifts for handling unit . UNIT WEIGHTS & RECOMMENDED ROOF OPENING Unit Approx. Unit Approx. Size Weight (lbs) Size Weight (lbs) EXHAUST INTAKE ERT-52 3590 45 ERCH-20 1640 ERT-58 5110 48 ERCH-45 750 ERT-64 5440 48 ERCH-55 300...
Page 4 . Make sure the unit is properly seated on the curb and is level . Curb Outside Dimensions and Curb Weights (lbs) Model Weight Model Weight ERT-52 ERCH-20 Curb Outside Dimensions 154 .5 65 .5 ERT-58 ERCH-45 74 .75...
Page 5 OUTDOOR Rail Rail Mounting Mounting Model Model INTAKE T u rning SUPPLY/EXHAUST HOOD Vanes OPENING ERT-52 ERCH-20 4 .75 41 .5 5 .1 5 .0 ERT-58 6 .75 47 .15 ERCH-45 7 .1 5 .1 SUPPLY/EXHAUST OPENING ERT-64 6 .75 47 .15 ERCH-55 5 .7...
Page 6 ELECTRICAL INFORMATION The unit must be electrically grounded in accordance with the current National Electrical Code, ANSI/NFPA No . 70 . In Canada, use current C .S .A . Standard C .1, Canadian Electrical Code, Part 1 . In addition, the installer should be aware of any local ordinances or electrical company requirements that might apply .
Page 7 5 . 4 VAC Control Transformer 6 . 4 VAC Terminal strip 7 . Fuses for blower motors Exploded Detail of Terminal Strip Model ERCH Model ERT ERT-52 ERT-74 ERT-58 ERT-64 Access to Control Center Components is gained through the access panel indicated.
Page 8 . Clearances for component removal may be greater than the service clearances, refer to drawings for these dimensions . ERT-52 ERT-58 *64 in.
Page 9 SERVICE CLEARANCES / ACCESS PANEL LOCATIONS FOR MODEL ERCH ERCH-0, 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 .
Page 10 DIMENSIONAL DATA / ACCESS DOOR DESCRIPTIONS AND LOCATIONS Exterior Dimensions Model ERT-52 1 .5 3 .5 ERT-58 59 .5 6 .5 19 .5 5 .5 ERT-64 59 .5 1 .375 5 .5 ERT-74 8 .75 7 .375 ERCH-20 8 .5 14 .5...
Page 11 . Be sure to replace factory installed grommets around coil connections if removed for piping . 4 . Greenheck does not supply compressor or condensing units with standard ERT and ERCH models; for further instruction on DX coil installation and operation contact your compressor and/or condenser...
Page 12 COMPONENTS SUPPLIED BY GREENHECK IN A SPLIT DX SYSTEM In a single circuit DX Coil, there will only be one liquid line and one suction line . Liquid Lines Nozzle Distributor Suction Lines Dual Circuit DX Coil DRAIN TRAP Cooling coils are provided with a stainless steel drain pan with 1-inch male NPT drain connection .
Page 13 OPTIONAL ACCESSORIES Electric Heater Application/Operation Factory installed electric heaters can be provided for preheat and/or post-heat . An electric preheater warms the outdoor air prior to the energy recovery wheel to prevent frosting on the wheel . An electric post-heater warms the air leaving the energy recovery wheel to a user specified discharge temperature .
Page 14 OPTIONAL ACCESSORIES Frost Control Application/Operation 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 Indoor RH @ 70º...
Page 15 OPTIONAL ACCESSORIES Economizer Application/Operation The energy recovery wheel operation can be altered to take advantage of economizer operation (free cooling) . Two modes are available: 1) De-energizing the wheel or ) Modulating the wheel . A field supplied call for cool (y1) is required .
Page 16 OPTIONAL ACCESSORIES Variable Frequency Drives for Blowers Optional factory installed, wired, and programmed variable frequency drives (VFD) may have been provided for modulating or multi-speed control of the blowers . One VFD is provided for each blower (outdoor air and exhaust) .
Page 17 (refer to previous page for terminal locations) . Most of the set points in the VFDs are factory defaults . There are a few, though, that are changed at Greenheck and are shown in the tables below . To gain access to change set points on the E7 drive, parameter A1-01 needs to be set at “”...
Page 18 OPTIONAL ACCESSORIES Wiring Diagram Following is an example of a typical wiring diagram located in the unit control center . This wiring diagram includes a legend highlighting which accessories were provided with the unit . Factory wiring and field wiring are also indicated .
Page 19 OPTIONAL ACCESSORIES Rotation Sensor The rotation sensor monitors energy recovery 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 C &...
Page 20 OPTIONAL ACCESSORIES CO2 Sensor This accessory is often used to provide a modulating control signal to a variable frequency drive to raise and lower airflow in relationship to the CO levels in the space . This strategy is often referred to as Demand Control Ventilation and provides further energy savings to the system .
Page 21 OPTIONAL ACCESSORIES Remote Control Panel and Wiring Schematics The remote panel is a series of junction boxes ganged together and includes a stainless steel face plate . 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 .
Page 22 OPTIONAL ACCESSORIES Remote Panel Wiring Schematics Indicator Lights powered by the ER Unit Unit On/Off Frost Control Economizer Rotation Sensor Dirty Filter Dirty Filter Indicator (Power by Others) Dirty Filter Refer to Pressure Switch for voltage and load ratings .
Page 23 OPTIONAL ACCESSORIES Remote Panel Wiring Schematics Unit On/Off Econ/First Stage Cooling Second Stage Cooling Terminal Block Heat Unit Control Center Night Setback Timer Night Setback Switch...
Page 24 OPTIONAL ACCESSORIES Sensors Mounted by Factory Factory mounted temperature, pressure, and current sensors are available in the locations indicated on the unit diagram below . A list of available sensors is shown below . The specific sensors provided on a given unit are labeled in the unit control center on the terminal strip .
Page 25 START-UP CHECKLIST FOR UNIT SAFETY DANGER! SAFETY CAUTION! Electric shock hazard . Can cause injury or death . Use caution when removing access panels or other Before attempting to perform any service or unit components, especially while standing on a maintenance, turn the electrical power to unit to OFF ladder or other potentially unsteady base .
Page 26 START-UP CHECKLIST FOR UNIT Special Tools Required Voltage Meter (with wire probes) Amperage Meter Incline manometer or equivalent Tachometer Thermometer 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 .
Page 27 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 Frost Control set point...
Page 28 . SAFETY 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 . Overlap Approx .
Page 29 Belt Span Deflection = MOTOR UNIT START-UP MOTOR 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 . Belt Span . Check fan and motor shafts for parallel and angular alignment . 3 .
Page 30 Backward Inclined UNIT START-UP Direction of Fan Wheel Rotation Airflow 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) .
Page 31 UNIT START-UP Inside layout of ERT Inside layout of ERCH Energy Recovery Wheel The ERT/ERCH 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 .
Page 32 ROUTINE MAINTENANCE SAFETY CAUTION! SAFETY DANGER! Use caution when removing access panels or other Electric shock hazard . Can cause injury or death . unit components, especially while standing on a Before attempting to perform any service or ladder or other potentially unsteady base . Access maintenance, turn the electrical power to unit to OFF panels and unit components can be heavy and at disconnect switch(es) .
Page 33 ROUTINE MAINTENANCE 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 .
Page 34 Filter Size Supply Exhaust and exhaust airstreams . These filters should be checked per a routine maintenance schedule ERT-52 0 in . x 5 in . and replaced as necessary to ensure proper ERT-58 16 in . x 0 in .
Page 35 ROUTINE MAINTENANCE External Filter Maintenance Aluminum mesh, -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 .
Page 36 **WARNING: Disconnect power to the unit before performing outdoor air filter door any type of service. REMOVING THE ENERGY RECOVERY WHEEL SEGMENTS Models ERCH-20, 45, 55 & 90 Models ERT-52, 58, 64 & 74 Bracket Segment Retainer Steel retainers are located on the Lift Away From Segment inside of the wheel rim (see diagram at right) .
Page 37 . Be sure to inspect wheel for smooth and unrestricted rotation . If a belt requires replacement, contact the local Greenheck representative . Instructions for replacement will ship with the new belt .
Page 38 PARTS LIST Model ERT (shown with optional cooling and heating coil) Model ERCH (shown with optional chilled water coil and indirect gas heater) 1 . Supply blower 7 . Optional supply and exhaust air filter racks for - Forward curved fan (ERCH models) in .
Page 39 . The ERCH and ERT units can be supplied with or without heating and cooling coils . For units with coils, controls can be supplied by Greenheck or by the controls contractor . If supplied by the controls contractor, they would provide, mount, and wire any temperature controllers and temperature or relative humidity sensors required for the unit to discharge air at the desired conditions .
Page 40 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 .
Page 41 Troubleshooting Symptom Possible Cause Corrective Action Blown fuse or open circuit Replace fuse or reset circuit breaker and check amps . breaker . Defective motor or capacitor . Replace . Blower Fails to Operate Motor starter overloaded . Reset starter and check amps . Electrical .
Page 42 Troubleshooting Symptom Possible Cause Corrective Action One or Both Blower fan motor overloads are Decrease fan speed . Blowers Turn Off tripping and auto-resetting . Intermittently and Exhaust Only frost control Adjust frost temperature sensor set point as needed . Back on After sensors are tripping .
Page 43 Notes:...
Page 44 Warranty Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the purchase date . The energy recovery wheel is warranted to be free from defects in material and workmanship for a period of five years from the purchase date .

This manual is also suitable for:

Ert-58 Ert-64 Ert-74 Erch-20 Erch-45 Erch-55 ... Show all