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4. Remove the valve. The preferred method of removing the valve is to cut the connection between the brazed
section and the valve, using a small tube cutter. Remove the valve.
Alternatively, use a wet rag to keep the valve cool. Heat inlet and outlet connections to valve body and
remove valve.
5. Clean the valve stem with mild cleaner, if necessary.
7.19.2
Installing an EEV
1. Install the valve and a new strainer with the cone of the strainer / screen pointing into the liquid line at the
inlet to the valve.
2. During installation, make sure the EEV coil is snapped down fully, and the coil retention tab is properly
seated in one of the valve body dimples. Also, ensure that coil boot is properly fitted over valve body. See
Figure
7.13.
3. Replace the filter drier.
4. Evacuate to 500 microns by placing the vacuum pump on the liquid line and suction service valve.
5. Open the liquid line service valve and check refrigerant level.
6. Check superheat. Refer to
7. Check unit operation by running a pre-trip. Refer to
7.20 HUMIDITY SENSOR
The humidity sensor is an optional component that allows setting of a humidity set point in the controller. In dehu-
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).
T-362
Figure 7.13 Electronic Expansion Valve
Flow
Direction
Strainer
Section
3.2.
7–22
Coil Boot
Coil
Electronic Expansion
Valve
Section
4.7.
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Troubleshooting
