Check Pin; Table Of Thermistor Characteristics - Sanyo C4272R Service Manual

Check Pin

Short-circuit the cooling check pin (or heating check pin) on the outdoor unit control PCB to perform the control
described below.
1. Thermistor checks
The checks listed below are performed for 1 second each, in order from the top down. The results are displayed
by LED 1 and 2.
Thermistor
Discharge temp. (TD)
Outdoor air temp. (TO)
Heat exchanger temp. (C1)
Heat exchanger temp. (C2)
Intake temp. (TS)
2. 4-way valve turns ON for 1 second.
3. Forced cooling (or heating) operation

4-4. Table of Thermistor Characteristics

1
(1) Outdoor Air Temp. (TO), Intake Temp. (TS), Heat
Exchanger Temp. (C1) Sensor, Heat Exchanger
Temp. (C2) Sensor
2
3
4
5
6
Check results
Normal
LED 1 lit
LED 2 lit
LED 1 lit
LED 1 and 2 OFF
LED 1 lit
Temperature (˚F)
Abnormal
(2) Discharge Temp. (TD) Sensors
IV-14
4. Service procedures
Temperature (°F)
SM831148