Operating instructions

37
6C. OVERLOAD PROTECTOR
An overload protector is a component that will open the AC volt
circuit to the compressor if the compressor overheats due to
an electrical problem. Some compressors have the overload
protector built inside the compressor. This type, if defective,
requires a complete compressor replacement.
Most compressors have the overload protector mounted on
the exterior of the compressor casing. To check this type of
protector, turn the air conditioner circuit breaker OFF. Make
sure that the overload is at ambient temperature and measure
continuity across its terminals. If open, it should be replaced.
A weak overload protector in the electrical system will cause
the compressor to start and stop rapidly or short-cycle. This
situation would be difficult to test. An exact replacement
overload protector should be used whenever a replacement is
required.
7C. COLD (FREEZE) CONTROL
(Low Temperature Protection Device)
The cold (freeze) control is used on rooftop air conditioners
ONLY. If it is used with rooftop heat pumps, it can cause
premature shutoff of the compressor.
8C. HEATER
The heater is an optional component. To diagnose the heat
strip, turn the air conditioner circuit breaker OFF. Unplug the
heater and take an ohm reading across the two wiring termi-
nals. 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 across
the limit switch terminals with the limit switch at ambient
temperature. If you have an open limit switch, replace it. Also
make sure the heater plug is properly connected.
600 & 630 FREEZE CONTROL
Do
kdkd
mfmf
579 & 595 FREEZE CONTROL