TM 9-4120-407-14
3-39. SOLENOID VALVE TESTING AND COIL REPLACEMENT.
c. Installation
This task covers:
b. Removal
a. Testing
INITIAL SETUP
Equipment Conditions:
Tools
Service Refrigeration Unit Tool Kit
Materials/Parts
a. Testing.
(1) Tag and disconnect wire leads from the solenoid valve coil (1).
Figure 3-59. Solenoid Valve Coil
terminals 1 and 2. If continuity is not found, the coil is open and must be replaced.
(3) Check for continuity between solenoid valve coil (1) terminal 1 and 2 and coil casing. If continuity
is found the coil is shorted and must be replaced.
(4) If continuity checks are satisfactory, apply 28 volts dc across solenoid valve coil (1) terminals 1
and 2. 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. Notify supervisor.
(5) If all checks are satisfactory, connect wire leads to solenoid valve coil (1) using tags and wiring
3-132