Greenheck ERV-251 User Manual

Greenheck ERV-251

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GREENHECK

P.O. BOX 410 SCHOFIELD, WISCONSIN 54476-0410

PH. 715-359-6171

ENERGY RECOVERY VENTILATORS

Models ERV-251, 361, 521, 581, 522 & 582

INSTALLATION, OPERATION AND MAINTENANCE MANUAL

**WARNING**

DISCONNECT ALL ELECTRICAL POWER TO THE ERV PRIOR TO INSPECTION OR SERVICING BY

SECURING THE MAIN DISCONNECT SWITCH TO THE "OFF" POSITION. 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 ANY ERV.

FAILURE TO COMPLY WITH THIS SAFETY PRECAUTION COULD RESULT IN PROPERTY

DAMAGE, SERIOUS INJURY OR DEATH.

PART #455924

READ AND SAVE THESE INSTRUCTIONS

Questions and Answers:

J
Jonathan TuckerAug 8, 2025
How to fix excessive noise in Greenheck ERV-251?
- R
  Rodney VazquezAug 8, 2025
  Excessive noise in your Greenheck Fan can stem from several sources. Start by checking if the fan wheel is rubbing against the inlet and adjust the wheel or inlet cone accordingly. Then, tighten the wheel hub or bearing collars on the shaft. Also, examine the bearings. If they are defective, replace them and lubricate the new bearings, tightening any loose collars and fasteners. Check the belts and tighten sheaves on the motor/fan shaft. Adjust belt tension and ensure sheaves are properly aligned. If belts or sheaves are worn, replace them. Finally, if the wheel is out of balance, replace or rebalance it.
J
James ZimmermanAug 12, 2025
What to do if my Greenheck ERV-251 Fan is not operating?
- D
  Deborah ReevesAug 12, 2025
  If your Greenheck Fan is not operating, begin by checking the electrical components. Examine the fuses and circuit breakers, replacing them if necessary. Also, check for any On/Off switches that may be in the off position. Finally, ensure that the unit is receiving the correct supply voltage. If the electrical components are functioning correctly, check the drive components for broken or loose belts and tighten any loose pulleys. If the issue persists, inspect the motor to ensure that the motor hp is correct and not tripping overloads.
M
Mrs. Alexis BrandtAug 17, 2025
Why is there low airflow (cfm) in my Greenheck Fan?
- M
  Mathew RodriguezAug 17, 2025
  If your Greenheck Fan has low airflow (CFM), first check if the blower fan speed is too low and verify that the drives and RPMs match the catalog data. Also, check the blower rotation. Ensure correct fan-to-duct connections and make sure dampers open appropriately. Increasing the fan speed may also help.
M
Mark WilliamsAug 21, 2025
Why is there high airflow (cfm) in my Greenheck ERV-251?
- P
  pacekeithAug 21, 2025
  If your Greenheck Fan has high airflow (CFM), check if the blower fan speed is too high and verify the correct fan RPM. Also, ensure that grilles, filters, and access doors are installed properly. Decreasing the fan speed may also help.
R
Robert RodriguezAug 25, 2025
What to do if one or both blowers turn off in my Greenheck ERV-251?
- K
  kathleen47Aug 26, 2025
  If one or both blowers of your Greenheck Fan turn off, it may be due to blower fan motor overloads tripping, in which case you should decrease the fan speed. It could also be that the exhaust only or On/Off frost control sensors are tripping; if so, adjust the frost temperature sensor set point as needed.
M
marykingAug 29, 2025
Why does the energy wheel not turn on my Greenheck Fan?
- R
  Robert LewisAug 29, 2025
  If the energy wheel on your Greenheck Fan does not turn, ensure the wheel drive is plugged in and that power is available. Check for loose or broken belts and replace them if necessary. Also, adjust temperature or enthalpy set points as needed.
P
pwilsonSep 2, 2025
Why does the energy wheel run intermittently on my Greenheck Fan?
- E
  Edgar ArnoldSep 3, 2025
  If the energy wheel on your Greenheck Fan runs intermittently, recheck the air seals to ensure they are not too tight.

Greenheck ERV-251 Specifications

General

Brand	Greenheck
Model	ERV-251
Category	Fan
Language	English

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