Greenheck ERVe Installation, Operation And Maintenance Manual page 26

Troubleshooting – Unit
Symptom Possible Cause
Blown fuse or open circuit breaker.
Defective motor or capacitor.
Blower fails to
Motor starter overloaded.
operate
Electrical.
Drive.
Control power (24 VAC) wiring run is too long
(resistance should not exceed 0.75 ohms).
Motor starters
"chatter" or
Incoming supply power is less than anticipated.
do not pull in
Voltage supplied to starter coil must be within
+10% / -15% of nominal voltage stated on the coil.
CFM too high.
Static pressures are higher or lower than
design.
Blower rotation is incorrect.
Motor over amps
Motor voltage incorrect.
Motor horsepower too low.
Shorted windings in motor.
Unit damper not fully open.
System static pressure too high.
Blower speed too low.
Fan wheels are operating backwards.
Low airflow (cfm)
Dirty filter or energy wheel.
Leaks in ductwork.
Elbows or other obstructions may be
obstructing fan outlet.
Belt slippage.
Blower fan speed too high.
Filter(s) not in place.
High airflow (cfm)
Insufficient static pressure (Ps) (airflow
resistance).
Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or
service information.
26 Energy Recovery Ventilator
Corrective Action
Replace fuse or reset circuit breaker and check
amps.
Replace.
Reset starter and check amps.
Check for On/Off switches. Check for correct
supply voltage.
Check for broken or loose belts. Tighten loose
pulleys.
Shorten wiring run to mechanical room or
install a relay which will turn unit on/off. Consult
Factory for relay information.
Need to increase supply power or use a special
control transformer which is sized for the actual
supply power.
Check cfm and adjust drives if needed.
If higher, ductwork should be improved.
If lower, fan rpm should be lower.
Check rotation and reverse if necessary.
Check motor nameplate versus supplied
voltage.
See specifications and catalog for fan curves to
determine if horsepower is sufficient.
Replace motor.
Adjust damper linkage or replace damper motor.
Improve ductwork to eliminate losses using
good duct practices.
Check for correct drives and rpm with catalog
data.
For 3-phase, see Direction of Fan Wheel
Rotation under Unit Start-Up section.
Follow cleaning procedures in Routine
Maintenance section.
Repair.
Correct or improve ductwork.
Adjust belt tension.
Check for correct fan rpm. Decrease fan speed
if necessary.
Install filters.
Induce Ps into system ductwork. Make sure
grilles and access doors are installed. Decrease
fan speed if necessary.