SOLENOID VALVES (L1 AND L2) TEST AND COIL REPLACEMENT

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