10-19-00 Air Conditioner Heat Pump Service Manual - Bryant RV ...

Section C - Components, cont’d.C6. Overload ProtectorAn overload protector is a component that will open the ACcircuit to the compressor if the compressor overheats dueto an electrical problem. Some compressors have the overloadprotector built inside the compressor. This type, if defective,requires a complete compressor replacement.Most compressors have the overload protector mountedon the exterior of the compressor casing. To check thistype of protector, turn the air conditioner circuit breaker OFF.Make sure that the overload is at ambient temperature andmeasure continuity across its terminals. If open, it shouldbe replaced. A weak overload protector in the electricalsystem will cause the compressor to start and stop rapidlyor short-cycle. This situation would be difficult to test. Anexact replacement overload protector should be used whenevera replacement is required. See FIG. C9.C7. Cold (Freeze) Control(Low Temperature Protection Device)The cold (freeze) control is used on roof top air conditionersONLY. If used with roof top heat pumps it can causepremature shutoff of the compressor.The cold control is normally open (no continuity), and closedwhen the temperature is below 41 to 49 degrees. The switchwill return to the open position at 52 to 62 degrees.Check continuity through the switch, in temperatures over62 degrees it should show open (no continuity) and in temperaturesbelow 41 degrees it will be closed. Any variationrequires the switch to be replaced. See FIG. C10 & C11.FIG. C11600 & 630 FREEZE CONTROLDokdkdmfmfFIG. C10579 & 595 FREEZE CONTROLC8. Electric Heater StripThe heater is an optional component. To diagnose the heatstrip, turn the air conditioner circuit breaker OFF. Unplugthe heater and take an ohm reading across the two wiringterminals. You should have an ohm reading of 9.5 ohms±10%. if the ohm reading is outside of these parameters,replace the heater.To check the heater limit switch, check for continuity acrossthe limit switch terminals with the limit switch at ambienttemperature. If you have an open limit switch, replace it.Also make sure the heater plug is properly connected.30