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Freshman Series - Owner's Manual - Installation, Operation, and Service Instruction - Version 1.1 EN
Changeair is not responsible for injury to untrained or unauthorized personnel who
attempt to do repairs based on the trouble shooting procedures outlined in this section.
8.6 General Air Handler Troubleshooting
Problem - Unit Tripped Breakers
1. Incorrect fuse; check fuse size.
2. Short circuit or incorrect unit wiring line voltage; check wiring (see diagram
located in unit electrical box).
3. Transformer short-circuited to ground.
4. Incorrect low voltage wiring; check wiring (see diagram located in unit electrical
box)
Problem - Supply Fan Not Running
1. Check for speed control operation.
2. Check for proper control signal at fan motor and relay.
3. Check for "supply VAC" at fan relay and motor.
Problem - Excessive Noise
1. Blower wheel rubbing- Check for proper positioning and clearance of blower
wheel. Adjust wheel as necessary.
2. Loosen blower wheel - Ensure wheel is properly tightened on motor shaft.
3. Blower wheel out of balance - Replace blower
4. Motor mounting - Motor mounts may have come loose.
Problem - Damper Not Opening or Working Improperly
1. Does ventilator require “occupied signal” to enable actuator? Check for any open
“safety circuits”.
2. Ensure damper circuitry is enabled; check for 24vac at actuator, check for dc
signal at actuator. If signals are present and actuator not functioning replace
actuator.
3. Determine if damper position is controlled from an Air Quality device. If an
Air Quality device is present test device output for DC voltage and actuator for
corresponding DC voltage “during occupied state”.
4. Check for mechanical obstruction.
NOTE:
Replacement Fuses must
be of the same rating,
type and size.
Troubleshooting Guide
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