38
ComPac 9/04-12
The control board (see section 1.6a for a complete description of the control board) has
a red diagnostic LED which indicates the lockout fault. The control board will enter into and
indicate lockout if either of the fault conditions (LPS or HPS) occur twice.
The contactor must be closed before the first fault condition can be recognized by the control
board. The contactor will be closed 3 minutes after the unit is energized and only if cooling
is required. The first fault condition will open the contactor and shutdown the unit. The
contactor on the unit that has the fault condition must be closed before the second fault
condition can be recognized by the control board. The contactor on the unit with the fault
condition will close after 3 minutes if the unit is still calling for cooling and if the fault condition
no longer exists. If you get a second fault condition, the contactor will open and shutdown
the unit. The “red” led will have one blink if the high pressure switch has opened twice and
will have two blinks if the low pressure switch has opened twice. The unit must be in the
cooling mode (compressor contactor Closed) before a fault condition can occur.
4.4 C
ONTROL
B
OARD
D
IAGNOSIS
