Compressor Load-Unload Solenoid
RTHC-SVD01B-EN 39
4. Measure the voltage from terminal J8-2 (load) to neutral. The volt-
age should increase to approximately 115 VAC for 2.5 seconds
every 5 seconds and then decrease back to 0 VAC. Ensure that
only the load solenoid is being energized.
5. Change the “Slide Valve Control” under Service Tests from “Load”
to “Unload”.
6. Measure the voltage from terminal J10-2 (unload) to neutral. The
voltage should increase to approximately 115 VAC for 2.5 sec-
onds every 5 seconds and then decrease back to 0 VAC. Ensure
that only the unload solenoid is being energized.
7. If either solenoid is not being energized when commanded check
all wiring to and from the solenoids.
8. Measure the power supplied to the Starter module. Measure the
voltage from J4-2 to ground and J6-2 to ground. The 115 VAC
should be present at all times. If it is not present, the problem is
either from the wiring or a faulty 2T4 120 V control power trans-
former.
If the solenoids and the 1U1 board pass the electrical test but the unit
is still not loading properly, proceed to the next section.
6-3. Checkout Procedure for the Slide Valve and
Load-Unload Solenoids
1. Connect a manifold gauge set to the schrader valve located at the
end of the piston housing. This schrader allows access to the
pressure behind the piston. Use hoses that are long enough to
allow reading the gauges while viewing the CLD.
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