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Greenheck ERCH - User Manual

Greenheck ERCH
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®
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with instructions could result in personal injury and/or property damage!
Energy Recovery Ventilator with Heating and Cooling 1
®
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,
including environmental. 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.
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 Electrical Code (CE) 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 affect 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. Verify that the power source is compatible with the
equipment.
6. Never open access doors to the unit while it is
running.
General Safety Information
DANGER
• Always disconnect power before working on or near
this equipment. Lock and tag the disconnect switch
or breaker to prevent accidental power up.
• If this unit is equipped with optional gas
accessories, turn off gas supply whenever power is
disconnected.
CAUTION
This unit may be equipped with a compressed
refrigerant system. If a leak in the system should
occur, immediately evacuate and ventilate the area.
An EPA Certified Technician must be engaged to
make repairs or corrections. Refrigerant leaks may
also cause bodily harm.
CAUTION
When servicing the unit, the internal components may
be hot enough to cause pain or injury. Allow time for
cooling before servicing.
WARNING
The roof lining contains high voltage wiring. To
prevent electrocution, do not puncture the interior or
exterior panels of the roof.
Document 476054
Model ERCH
Energy Recovery Ventilator
with Heating and Cooling

Table of Contents

Questions and Answers

  • B
    Brandon GutierrezSep 6, 2025
    Why do the motor starters “chatter” or not pull in on my Greenheck Fan?
    • K
      Karina KimSep 6, 2025
      If the motor starters in your Greenheck fan are chattering or not pulling in, it could be due to a long control power wiring run, causing excessive resistance (over 0.75 ohms). Shorten the wiring run to the mechanical room or install a relay to turn the unit on/off; consult the factory for relay information. Alternatively, increase the wire gauge size to reduce resistance to 0.75 ohms or less. Another cause could be insufficient incoming supply power; the voltage supplied to the starter coil must be within +10% / -15% of the nominal voltage stated on the coil. Increase the supply power or use a special control transformer sized for the actual supply power.
  • R
    rgibsonSep 4, 2025
    Why is my Greenheck Fan compressor humming, but not starting?
    • T
      tyler29Sep 4, 2025
      If your Greenheck fan's compressor is humming but not starting, several issues could be the cause. Check for improperly wired connections by reviewing the wiring schematics. Low line voltage could be the problem, so verify the voltage. Loose wiring can also prevent starting, so check all connections. A defective start relay or damaged motor winding might be the reason, requiring replacement of the relay or compressor. Finally, internal mechanical damage to the compressor could be the cause, necessitating replacement.
  • C
    Cynthia JonesSep 1, 2025
    Why does the Greenheck Fan compressor start but cut out on high pressure switch?
    • A
      Adrian EstradaSep 1, 2025
      If your Greenheck fan's compressor starts but cuts out on the high pressure switch, it could be due to several reasons. There might be a refrigerant overcharge, so check pressures and charge by subcooling. Air or non-condensables in the system can also cause this, so check high side equalized pressures and thermal expansion valves. A defective high pressure switch itself could be the problem, requiring replacement. Additionally, a restriction in the discharge or liquid line could be the cause; check refrigerant line pressures and thermal expansion valves, replacing any defective components. Finally, the condensing fan relay might not be pulling in, necessitating replacement.
  • C
    Courtney CarterAug 30, 2025
    What causes a Greenheck Fan compressor to start but cut out on low pressure?
    • M
      Melissa MuellerAug 31, 2025
      If your Greenheck fan's compressor starts but then cuts out due to low pressure, several factors could be at play. It might be due to low or lost refrigerant charge, so check the refrigerant pressures and temperatures, including subcooling. Restricted airflow can also cause this issue; inspect for dirty evaporator coils and filters, closed dampers, iced evaporator coils, and improper belt conditions, and check the motor amps and duct design. A restriction in the refrigerant line could be the cause, look for frosted tubing and components, and check the pressure drop across the filter drier. Lastly, a defective low pressure switch could be the culprit, requiring replacement.
  • L
    Lauren BradyAug 29, 2025
    Why is the motor over amping in my Greenheck Fan?
    • W
      William GarciaAug 29, 2025
      If the Greenheck fan's motor is drawing excessive amps, it could be due to several reasons. The static pressures might be higher than designed; check for dirty filters and improve the ductwork. The motor voltage may be incorrect, so verify the motor wiring and compare the motor nameplate with the supplied voltage. It's also possible that the motor horsepower is too low; consult the specifications and catalog for fan curves to determine if the horsepower is sufficient. Finally, shorted windings in the motor can cause this issue, requiring the motor to be replaced.
  • J
    James PierceAug 21, 2025
    Why is my Greenheck Fan making excessive noise or vibration?
    • D
      Debbie MooreAug 21, 2025
      If your Greenheck fan is exhibiting excessive noise or vibration, several factors could be contributing. The fan wheel might be rubbing on the inlet, requiring adjustment of the wheel and/or inlet cone, and tightening of the wheel hub or bearing collars on the shaft. Defective bearings can also cause this issue, needing replacement, lubrication, and tightening of collars and fasteners. A loose wheel on the shaft or a loose motor base or blower can be the problem, requiring tightening of the wheel hub or mounting bolts. Noise transmitted by the ductwork can also contribute; ensure the ductwork is properly supported, the metal thickness is adequate for stiffness, and the duct size at the discharge is appropriate to avoid high air velocities.
  • J
    Joshua ClementsDec 3, 2025
    Why does my Greenheck Fan compressor cut out on thermal overload?

    Greenheck ERCH Specifications

    General IconGeneral
    ModelERCH
    CategoryEnergy Recovery Ventilator
    TypeEnergy Recovery Core
    EfficiencyUp to 80% sensible effectiveness
    Voltage Options460/3/60
    ApplicationsCommercial buildings, schools, hospitals, offices
    ConstructionGalvanized steel casing with insulated panels
    Motor TypeEC motor

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