10. Operation Pressure Switch
Scroll Recycle Delay Timer
The defrost board is equipped with a recycle delay timer which will
delay the start of the compressor for 5 minutes in the event of a
power interruption. This sequences power throughout the
system and prevents possible reverse rotation of the scroll
compressor. The output of the timer controls the compressor
contactor via a normally open contact of K3 (T2). The timer starts
the delay cycle when the compressor is turned off by removal of
"Y." If application of "Y" occurs before the timer has expired, the
compressor contactor will not be energized until the timer has
expired.
Loss of Charge Pressure Switch: Units are equipped with a low
pressure switch on the liquid line (high side) which has been
installed to prevent system damage due to a loss of charge. The
switch will open and de-energize the contactor if the high side
pressure drops below the set point of the switch.
High Pressure Switch: The PHM348-54 are equipped with a high
pressure switch to protect the compressor.
REDUCED EQUIPMENT LIFE HAZARD
Failure to follow this caution may result in premature
component failure.
Do NOT operate unit on cooling when the outdoor
temperature is below 45°F or PHM324 and 40°F for
PHM330-54. This is necessary to prevent possible
damage to the compressor.
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