Greenheck ERCH-20 - User Manual

Questions and Answers

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cyoungAug 21, 2025
Why is my Greenheck Fan making excessive noise or vibration?
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  Christina DoyleAug 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.
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Mary SteinAug 26, 2025
How to troubleshoot a Greenheck Fan when the blower fails to operate?
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  Katie HolmesAug 26, 2025
  If your Greenheck fan's blower isn't working, start by checking the fuse or circuit breaker. If they're blown or open, replace the fuse or reset the breaker, and then check the amps. If that's not the issue, the motor might be overloaded; in that case, reset the VFD and check the amps. Also, check for any On/Off switches, ensure the correct supply voltage, and inspect the control wiring. The motor or capacitor could also be defective, requiring replacement.
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james14Aug 29, 2025
Why is the motor over amping in my Greenheck Fan?
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  Donald SmithAug 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.
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Teresa GomezAug 30, 2025
What causes a Greenheck Fan compressor to start but cut out on low pressure?
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  Alexander Hall MDAug 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.
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Heather ReidSep 1, 2025
Why does the Greenheck Fan compressor start but cut out on high pressure switch?
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  Ann OwensSep 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.
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Brian RichardsSep 4, 2025
Why is my Greenheck Fan compressor humming, but not starting?
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  Mr. Dylan CooperSep 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.
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Tony MillerSep 6, 2025
Why do the motor starters “chatter” or not pull in on my Greenheck Fan?
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  Shane DennisSep 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.
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Brian CampbellSep 7, 2025
Why is the airflow (cfm) high in my Greenheck Fan?
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  Kimberly HannaSep 7, 2025
  If your Greenheck fan is experiencing high airflow (CFM), several factors could be the cause. The blower fan speed might be too high, so check for the correct maximum fan RPM and decrease it in the VFD if necessary. The absence of filters can also lead to high airflow, so install them. Insufficient static pressure (Ps) can be a factor, so induce Ps into the system ductwork, ensure grilles and access doors are installed, and decrease the fan speed if necessary.
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Kim ValenzuelaSep 12, 2025
What causes high discharge pressure in my Greenheck Fan?
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  Samuel Gilmore PhDSep 12, 2025
  If your Greenheck fan is experiencing high discharge pressure, several factors could be contributing. The thermal expansion valve setting might be off, so check the setting and calibrate superheat/subcooling. Too much refrigerant in the system can also cause this, so check subcooling and remove excess refrigerant. Non-condensables in the system can lead to high discharge pressure, so remove them. High load conditions can also be a factor; consider adding more equipment or reducing the load.
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kristygeorgeSep 14, 2025
What causes low discharge pressure in my Greenheck Fan?
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  Justin CrawfordSep 14, 2025
  If your Greenheck fan is experiencing low discharge pressure, several factors could be contributing. An insufficient refrigerant charge is a common cause, so check subcooling and look for leaks, repairing any leaks and adding refrigerant as needed. A defective or improperly adjusted expansion valve can also lead to this issue, so check superheating and adjust the thermal expansion valve. Additionally, low suction pressure itself can result in low discharge pressure; refer to the troubleshooting steps for “low suction pressure.”