Troubleshooting
!WARNING
Hazardous Service Procedures!
The maintenance and trouble shooting procedures recommend- ed in this section of the manual could result in exposure to electri- cal, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concern- ing these procedures. When possi- ble, disconnect all electrical power including remote discon- nects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be in- advertently energized. When nec- essary to work with live electrical components, have a qualified li- censed electrician or other indi- vidual who has been trained in handling live electrical compo- nents per these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.
Preliminary Trouble Inspection If operational difficulties are encoun- tered, be sure to perform the prelimi- nary checks before referring to the troubleshooting chart on page 28.
•Verify that the unit is receiving elec- tric supply power.
•Ensure that the fuses in the fused disconnect are intact.
After completing the preliminary checks, inspect the unit for other obvi- ous problems such as leaking connec- tion, broken or disconnected wires, etc. If everything appears to be in or- der, but the unit still fails to operate properly, refer to the troubleshooting chart on page 28.
General Operation
The standard model is designed for in- door installation. When the unit is in- stalled in an unconditioned space, the unit may not start in cool weather (ap- proximately 45°F). It may then be nec- essary to start the unit in the cooling mode for three to five minutes. The unit may then be
Operation with a Conventional Thermostat
The unit is equipped with safety con- trols, including high pressure control, low pressure control and a freeze pro- tection thermostat, set to shut off the compressor under abnormal tempera- ture or pressure conditions. If the safe- ties shut off the compressor, a lockout relay prevents short cycling from the abnormal condition. When conditions are corrected, the lockout control can be reset by setting the thermostat sys- tem switch to OFF wait a few minutes for the system pressure to equalize, and then return to HEAT or COOL. If the condition continues, an authorized service person should check out the unit.
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