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SERVICE VALVES - 506780234
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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Figure 4-73. Solenoid Valve Coil Removal
TM 5-4120-359-14
b. Installation
(1) Place service valve on condenser housing and aline screw holes.
(2) Apply locking compound, item 15, Appendix E, to screw threads.
(3) Using screwdriver, install service valve with two screws.
(4) Using wrench connect and tighten flare nut to back of valve.
(5) Replace the dehydrator. (See paragraph 4-73.)
(6) Leak test the newly connected joints and all connections in those areas. (See paragraph 4-8.)
(7) Evacuate and charge the system. (See paragraphs 4-9 and 4-10.)
Follow-on Procedures: 1. Install right end condenser cover. (See paragraph 3-26.)
2. Install condenser section electrical module assembly. (See paragraph 4-90.)
3. Connect power.
4-69. SOLENOID VALVES (L1 AND L2) TEST AND COIL REPLACEMENT
Preliminary Procedures:
1. Disconnect power.
2. Remove top condenser cover. (See paragraph 3-25.)
a. Test
WARNING
Disconnect input power from the air conditioner before performing maintenance
on any part of the electrical system. The voltages used can be lethal.
NOTE
The following basic instructions apply to both the equalizing solenoid L1 and the
liquid line solenoid L2.
(1) Disconnect the solenoid valve leads at the quick disconnect terminals.
(2) Use multimeter set on the lowest ohms scale to check for resistance between leads. If resistance is not
between 40 and 70 ohms, the coil is bad and must be replaced.
(3) Use multimeter to check for continuity between each lead and the coil casing. If continuity is found between
either lead and the case, the coil is grounded and should be replaced.
(4) If resistance checks are satisfactory, apply 24 volts dc from an external power supply across the leads and
listen for a sharp click when the valve changes position. If a click is not heard, internal valve problems are indicated and
the entire valve should be replaced. See paragraph 4-70 for complete valve replacement.
4-146

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