10
ComPac 9/04-12
Normal
24 VAC power must be continuously applied to “R” and “C”. Upon a call for cooling “Y” and
with the high pressure switch (HPS) closed, the compressor will be energized. (Note: See the
delay on make feature.) The compressor will remain energized during the 3 minute timed low
pressure by-pass cycle, if the low pressure switch (LPS) is open the compressor will de-
energize.
Lock-out
If either of the fault conditions (LPS or HPS) occurs twice, the control board will enter into
and indicate the lockout mode. In the lockout mode, the compressor is turned off. If there is
a call for indoor air flow “G”, the blower remains energized, the alarm output is energized and
the status led will blink to indicate which fault has occurred. When the lockout condition is
cleared, the unit will reset if the demand for the thermostat is removed or when the power is
reset. With the control board, the user can now have normally closed contacts by moving a
wire on the control board. The ComPac
®
air conditioners are factory wired to be normally
open.
Delay on Break
If the compressor is de-energized due to a loss of a cooling “Y” call or the first fault, the unit
re-start will be delayed 3 minutes from the time the contactor is de-energized. (Note: There
is no delay on break if the lockout condition is reset.)
Delay on Make
On initial power up only, the unit will wait 0.03 to 10 minutes from the cooling “Y” call before
allowing the contactor to energize. The delay can be adjusted by the DOM wheel on the
board. Factory recommended wait is 3 minutes.
Low Pressure By-Pass Time
While running or starting, the low pressure switch (LPS) fault condition will be by-passed
for 3 minutes before de-energizing the contactor.
Post Purge
Upon a call for indoor airflow “G” the blower will energize immediately. When in the cooling
mode, the blower will remain energized for 10 to 90 seconds (adjustable) after the compressor
has been de-energized. The time period can be changed by fan purge wheel on the board.
Factory setting is 90 seconds.
LED Indicator Lights
COLOR TYPE
STATUS
DESCRIPTION
Green
Power
Constant On
24 VAC power has been applied
Constant On
Normal operation
1 Blink
High pressure switch has opened twice
Red
Status
2 Blinks
Low pressure switch has opened twice
1.6
A
E
LECTRONIC
C
ONTROL
B
OARD
M
ODE
OF
O
PERATION
(AVP20-60)
(S
EE
S
ECTION
1.6B
FOR
M
ECHANICAL
C
ONTROLS
)
