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All installations and services must be performed by qualified personnel.
11
PRINTED CIRCUIT BOARD
MODE OF OPERATION
STATUS LED A green status LED indicates that control power is present.
A red status LED indicates DELAY ON BREAK or faults. A flashing red LED indicates:
NO FLASH COMPRESSOR IS RUNNING
1 Flash DELAY ON BREAK
2 Flash Less-than 1 Hr since loss of LPS
3 Flash Less-than 1 Hr since loss of HPS
4 Flash Less-than 1 Hr since loss of LPS & HPS
5 Flash Manual lockout LPS
6 Flash Manual lockout HPS
RANDOM START When power is first applied to the PCB, a random start time delay will occur that is
150-180 seconds long. If the thermostat is calling (Y) and the high-pressure switch is closed, the
compressor contactor will energize after the random start time is complete.
DELAY ON BREAK Breaking the circuit with the HPS, LPS, or the thermostat will de-energize the
compressor contactor and initiate the DELAY ON BREAK timer.
The compressor contactor will remain de-energized until the DELAY ON BREAK time has expired.
The DELAY ON BREAK time is 180 seconds.
HIGH PRESSURE SWITCH If the HPS opens while the compressor contactor is energized for greater
than 500 ms, the compressor contactor will de-energize until the DELAY ON BREAK time has expired
and the HPS has closed.
If the HPS opens twice within 1 hr, the fault protection feature will energize and the control will go into
lockout. The control will not reset until the thermostat and/or power is cycled and the HPS is closed.
LOW PRESSURE SWITCH
There is a 120-second bypass time for the LPS. If the LPS opens for
greater than 120 seconds, the compressor contactor will de-energize until the DELAY ON BREAK time
has expired and the LPS has closed.
NOTE: If the LPS opens twice within 1 hr, the fault protection feature will energize and the control will
go into lockout. The control will not reset until the thermostat and/or power is cycled and the LPS is
closed.