Compressor Load-Unload Solenoid
38 RTHC-SVD01B-EN
Volt lamp, to the terminals when testing the outputs may help. Refer to
the chiller control wiring diagrams and component location drawings
for the following procedure.
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this prod-
uct, it may be necessary to work with live electrical components. Have a
qualified licensed electrician or other individual who has been properly
trained in handling live electrical components perform these tasks. Fail-
ure to follow all electrical safety precautions when exposed to live elec-
trical components could result in death or serious injury.
The following procedure is done with power applied to the modules and
control circuits. Use extreme caution when performing this procedure.
As mentioned above, the unload solenoid valve will be powered by the
1U1 and remain energized if the compressor is off. Also, the compressor
and associated solenoids. may be started or energized at any time
under automatic control.
When a triac is off, about 1-2 VAC should be measured on its terminal
with the solenoid load connected. When it is on, the voltage should be
close to 115 VAC (the drop across the triac is about 1-2 volts).
To determine if the solenoids are being energized perform the following
steps:
1. Wire a low wattage (25-40 watt 120 VAC) lamp in series with the
solenoids. If a low wattage lamp is not available, check for mag-
netism on top of the solenoids during each pulse with the tip a of a
screwdriver.
2. Enter the Service Test Menu and change the “Slide Valve Control
Setting is:” from Auto to Load. This will cause the compressor to
load immediately
NOTE: The red alarm light on the front pannel will energize and remain
steady any time an item in the Service Test menu is set to something
other than “AUTO”.
NOTE: Adaptive control can alter the test if the chiller is in a limit or
near setpoint. Monitor the operating mode to verify that the test is
accurate.
3. Increase the next menu item, under the Service Test Menu, “Man-
ual Load/Unload Duty Cycle”, up to 50%. This will provide a 2.5
second pulse every 5 seconds sent to the solenoids to ease in
testing.
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