B1462

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1462/62: Room Humidity Sensor Circuit
B1462/62 - Room Humidity Sensor Circuit

DESCRIPTION

The room humidity sensor detects room humidity. The voltage of the room humidity sensor changes in accordance with room humidity. The air conditioning amplifier reads changes in the room humidity sensor.

The room humidity sensor is integrated with the room temperature sensor.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (HUMIDITY SENSOR)

(a) Use the Data List to check if the room humidity sensor is functioning properly.

Air Conditioner





OK:

The display is as specified in the normal condition.

NG -- CHECK WIRE HARNESS (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER)

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal

2. CHECK WIRE HARNESS (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER)





(a) Disconnect the L37 room humidity sensor (room temperature sensor) connector.

(b) Disconnect the L77 air conditioning amplifier connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK AIR CONDITIONING AMPLIFIER (S5-1 - SG-1 VOLTAGE)





(a) Remove the air conditioning amplifier with its connectors still connected.

(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal
OK -- Continue to next step.

4. INSPECT ROOM TEMPERATURE SENSOR (ROOM HUMIDITY SENSOR)





(a) Remove the room humidity sensor (room temperature sensor).

(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NOTICE:
* Do not touch the humidity sensor as body heat will affect the inspection results. When performing the inspection, hold the sensor by its connector.
* Allow the sensor to acclimate to the ambient temperature and humidity before performing the inspection.
* The standard voltages in the table above are based on inspections performed when the ambient temperature is 25°C (77°F).

NG -- REPLACE ROOM TEMPERATURE SENSOR Removal

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal