COOK ERV - Manual (Page 12)

12
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the blower wheels rotate in same di-
rection as the arrows on the motor or belt drive assembly.
•Poor fan inlet conditions. There should be a straight clear duct at the inlet.
•Improper wheel alignment.
Overheated Bearings
• Improper bearing lubrication
• Excessive belt tension.
High Pressure Drop
• Check air flow compared to design.
• Check filters and clean/replace as necessary.
• Check energy recovery wheel media for pluggage and clean per cleaning in-
structions.
Inadequate Energy Recovery Wheel Performance
• Check wheel rotation speed.
• Check for wheel integrity and adjust seals or replace worn seals.
• Check entering air conditions and compare design.
• Check ducting for leakage and fix any leaks.
• Check media for dirt and clean per cleaning instructions.
Excessive Vibration and Noise
• Damaged or unbalanced blower wheel.
• Belts too loose; worn or oily belts.
• Speed too high.
• Incorrect direction of rotation. Make sure the blower wheels rotate in same
direction as the arrows on the motor or belt drive assembly.
• Bearings need lubrication or replacement.
• Fan surge.
• Check seals and adjust as necessary.
• Check the bearings for source of noise.
• Check the belts for slippage.
Overheated Motor
• Motor improperly wired.
• Incorrect direction of rotation. Make sure the fan rotates in same di-
rection as the arrows on the motor or belt drive assembly.
• Cooling air diverted or blocked.
• Improper inlet clearance.
• Incorrect fan RPMs.
• Incorrect voltage.
Improper Blower Wheel Rotation
• Check drive belts for engagement with sheave.
• Check drive motor.
• Check drive motor wiring for proper voltage. Supply and/or exhaust blower motors turned off
• Motor overloads could be tripping.
• If the unit is equipped with an on/off or exhaust only frost protection,
then check frost temperature set point and adjust if required.
Energy Recovery Wheel Is Not Turning — or runs intermittently
• Check for loose or broken wheel drive belt.
• Bulb seals could be too tight against sealing surfaces.
• If unit is equipped with an economizer control, then check temperature or en-
thalpy set points and adjust if required.