62-11785 8–24
d. Replacing Expansion Valve & Strainer
1. Pump down the low side. Refer to
Section 8.5.2
.
2. Remove coil and unbraze valve. Clean all tube stubs so new valve fits on easily.
3. Verify the strainer is in place.
4. Use a wet rag to keep the replacement valve cool and braze in place.
5. Leak check and evacuate the low side. Refer to
Section 8.5.3
and
Section 8.5.4
.
The strainer for the ECXV is located in the tube above the LIV connection, refer to Figure 8.8.
8.7.9 Liquid Injection Solenoid Valve
a. Replacing the Coil:
The coil may be replaced without removing the refrigerant.
1. Ensure the unit will not start automatically by placing the START/RUN-OFF switch in the OFF position. Dis-
connect the high voltage source and lockout/tagout the receptacle.
2. Disconnect coil connector.
3. Remove locking nut, upper O-ring, threaded collar coil and lower O-ring (See
Figure 8.14
).
4. Verify coil type, voltage and frequency of old and new coil. This information appears on the coil housing.
5. Ensure upper and lower O-rings are installed on top and bottom of coil and tighten locking nut to 1.2 to 1.4 Nm
(10 to 18 inch-pounds).
b. Repairing the Valve:
1. Pump down the low side. Refer to Section 8.5.2.
2. Remove the armature tube, taking care the armature and spring do not drop out.
3. Ensure the spring is properly seated in the armature and install into the armature tube.
4. Install a new internal O-ring into the valve body and then reinstall the enclosing tube with armature and spring.
c. Replacing the Valve:
1. To replace a valve, pump down the low side. Refer to Section 8.5.2.
2. Ensure the unit will not start automatically by disabling any two way communication and placing the START/
RUN-OFF switch in the OFF position. Disconnect the high voltage source and lockout/tagout the receptacle.
3. Remove coil, refer to “Replacing the Coil” above.
4. Unbraze valve from unit and braze new valve in place. Wrap valve in wet rag and point flame away from valve
during brazing operation.
5. Install coil, refer to “Replacing the Coil” above. Leak check, evacuate the unit and charge in accordance with
Section 8.5
.
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