Carrier PrimeLINE 69NT40-561-200 Operation And Service Manual page 141

Procedure:
1. Remove the left Upper Fresh Air Makeup Vent panel.
2. Remove the humidity sensor from the mounting hardware and bring to the front of the access panel.
3. Disconnect the humidity sensor from the harness.
4. Drill a 3 cm (1.25 in) hole in the cap of a bottle.
5. Pour approximately 100 ml (3.4 oz) of water into the empty clean bottle.
6. Add salt to the water until it is present at the bottom of the bottle.
7. Cap the bottle and tape over the drilled hole.
8. Shake the bottle until the salt dissolves and water is saturated.
To ensure saturation, add additional salt until it settles at the bottom without dissolving while shaking.
9. Remove the cap and insert the humidity sensor into the bottle through the bottle opening and pull the con-
nector back through the drilled hole in the cap. Then, secure the cap and seal the wire going through the
cap.
Make sure that the sensor is not at all in contact with the salt water.
10. Allow the saturated salt mixture to settle for approximately ten minutes.
11. Reconnect the humidity sensor to the harness and power the reefer unit on.
12. Press the CODE SELECT key on the keypad.
13. Use the UP and DOWN arrow keys until "Cd17" is displayed then press ENTER. This displays the humidity
sensor reading.
14. Verify the reading is between 60% and 85% relative humidity.
15. If the humidity sensor display is outside of this range, reconfirm the salt mixture and retest. If not in range,
replace the sensor at the next opportunity.
Cap opening (6 cm)
Salt water solution
COOL HEAT DEFROST
SETPOINT/Code
NOTE
NOTE
Cap hole (3 cm)
Humidity Sensor
IN RANGE ALARM SUPPLY RETURN
AIR TEMPERATURE/Data
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