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Model ERCH-HP Energy Recovery Unit
Symptom Possible Cause Corrective Action
Blower fails to
operate
Blown fuse or open circuit breaker. Replace fuse or reset circuit breaker and check amps.
Defective motor or capacitor. Replace.
Motor starter overloaded. Reset starter and check amps.
Electrical.
Check for On/Off switches. Check for correct supply
voltage.
Drive.
Check for broken or loose belts. Tighten loose
pulleys.
Motor starters
“chatter” or
do not pull in
Control power (24 VAC) wiring run is too long
(resistance should not exceed 0.75 ohms).
Shorten wiring run to mechanical room or install a
relay which will turn unit on/off. Consult Factory for
relay information. Increase wire gauge size so that
resistance is .075 ohms or less.
Incoming supply power is less than anticipated.
Voltage supplied to starter coil must be within
+10% / -15% of nominal voltage stated on the
coil.
Need to increase supply power or use a special
control transformer which is sized for the actual
supply power.
Always have a completed Pre Start-Up Checklist and Unit Start-Up Checklist prior to requesting parts or service information.
Troubleshooting – Unit
Troubleshooting – Airflow
The Test and Balance Report (TAB) is utilized to determine whether the appropriate amount of outdoor air
and exhaust air is being supplied and removed from a building, respectively. There are no set rules on what
information must be included in a TAB report. As such, if a TAB report indicates that the airflow on a unit is low,
prior to contacting the factory, please determine the following information:
Unit #1 Unit #2 Unit #3 Unit #4
Model Number
Serial Number
Nameplate Information
Voltage
Hertz
Phase
Outdoor Air Fan Amps
Outdoor Air Fan Horsepower
Design Airflow
Outdoor Air
Measured Airflow
Outdoor Air
Measured Data
Blower Rotation
Outdoor Air Fan RPM
Outdoor Air Fan Amp Draw
Airflow problems can often be tied back to improper ductwork installation. Be sure to install ductwork in accordance
with SMACNA and AMCA guidelines.