156
• The PWM valve is a normally closed valve and requires
a solenoid coil to be energized to open the valve. The
PWM valve is equipped with a manual lifting stem,
when front seated, will force the valve fully open.
• Once the PWM valve is brazed in-place, the solenoid
coil can be installed. Use Carlyle solenoid coil
8ADB000688 or 8ADB000689. These coils have been
qualified and life-cycle tested with the PWM valve. The
use of any other coil is not approved by Carlyle.
• The PWM valve solenoid coil should wire back to the
Smart Control, Coil #1 position as shown in electrical
schematic Fig. 37.
• The PWM valve should not be cycled by the smart con-
troller when the compressor is not operating. Power to
the PWM valve solenoid coil should be interrupted
whenever the compressor trips off or is intentionally
taken out of service.
• The PWM valve is designed to open/close at a specified
rate to modulate compressor capacity. Upon valve clo-
sure, the compressor crankcase will pull into a vacuum.
The 06D, 06CC, and 06M compressors have all been
functionally tested and approved to operate in this
manner.
Fig. 41 — Refrigerant Flow Direction
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