maintenance
Maintenance procedures
Troubleshooting
Use the following steps and procedures to help correct these common problems.
WARNING
Hazardous voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Problem
The entire unit does not operate.
Possible cause
1. Power interruption
2.Thermostat not operating
3.Electrical panel: a)
Remedy
1.Check for blown fuses or tripped circuit breakers. Replace or reset if necessary.
2.Setting may be too high; check unit and reset. Thermostat may be out of calibration or otherwise defective; replace.
3.Correct as required.
Problem
Fan runs but compressor does not start.
Possible cause
1.Low voltage
2.Remote thermostat
3.Compressor contactor open or burned
4.High pressure control cutting out unit
5.Refrigerant leak - no gas
6.Loose or defective wires.
7.Compressor shorted, open or burned
8.Defective compressor
Problem
Unit held off by safety.
Possible cause
1.Unit cutout on high pressure control, set at 385 psig
2.Refrigerant leak
3.Air restriction, dirty coils
4.Partial restriction in refrigerant system
5.High pressure control
6.TXV power element charge loss
7. Loose connection in electrical unit
Problem
Noisy operation.
Possible cause
1.Copper tubing vibrating
2.Machine vibrating out of level
3.Loose cabinet or internal component
4.Loose fan wheel
5.Blower wheel hitting shroud
6.Blower motor bearing defective
7.Blower bearing defectiv
Remedy
1.Check power supply for voltage outside the acceptable voltage range.
2.Check the control unit for loose wires. Firm any loose connections.
3.Replace.
4.Check for loose wire connection, broken or burned contacts. If defective, replace.
5.Locate leak and repair. Recharge unit.
6.Tug on wires to see if they will separate from connections. Replace terminals if necessary.
7.Check for shorts, opens, and grounded. Remove and replace compressor.
8.Remove and replace.
Remedy
1.Verify the airflow is uninterrupted. Also, verify that the low ambient damper is set properly, allowing condensing temperatures of
2.See if unit is low on refrigerant charge. Repair leak and recharge unit.
3.Verify if the air filter is dirty or has an airflow restriction, and correct problem.
4.Locate restriction by inspecting refrigerant lines for temperature changes. Remove restriction, evacuate, and recharge.
5.Replace, if defective.
6.Evacuate, replace element, recharge.
7.Trace and firm up connection.
Remedy
1.Adjust tubes by bending slightly to firm position without touching other unit parts.
2.Level unit base. Fully support base.
3.Check and tighten loose screws.
4.Tighten screws on fan wheel shaft.
5.Adjust wheel position on motor shaft
6.Replace fan motor.
7.Replace fan bearing.
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