7–23
T-372
Figure 7.13 Electronic Expansion Valve
1) Coil Boot
2) Coil
3) Electronic Expansion Valve (EEV)
4) Strainer
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7.20 Humidity Sensor
The humidity sensor is an optional component that allows setting of a humidity set point in the controller. In dehu
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midification mode, the controller will operate to reduce internal container moisture level.
7.20.1
Checking the Operation of the Humidity Sensor
This procedure is to be performed in an effort to ease the troubleshooting of the humidity sensor. When performing
this procedure and while working on the unit, always follow the proper lockout/tagout procedures.
Items Required:
• One 7/16” socket wrench or nut driver.
• One 1/4” socket wrench or nut driver.
• One clean, clear water bottle with a minimum 6 cm (2.5 in) opening and capacity to hold 500 ml (16.9 oz).
• 100 ml (3.4 oz) of fresh water - distilled if available.
• 50 gm of Salt (NaCl).
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.
NOTE
To ensure saturation, add additional salt until it settles at the bottom without dissolving while shaking.
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3
4
Flow
Direction
1
