Low Pressure Switch Bypass Operation; Figure 22 Defrost Control Board - Bard 11EER WH Series Installation Instructions Manual

In order to terminate the defrost test, the SEN JMP
jumper must be removed. If left in place too long, the
compressor could stop due to the high pressure control
opening because of high pressure condition created
by operating in the cooling mode with outdoor fan off.
Pressure will rise fairly fast as there is likely no actual
frost on the outdoor coil in this artificial test condition.
There is also a 5-minute compressor time delay
function built into the HPC. This is to protect the
compressor from short cycling conditions. The board's
LED will have a fast blink rate when in the compressor
time delay. In some instances, it is helpful to the
LOW PRESSURE BYPASS TIMER SWITCH
*(FACTORY SETTING 120 SECONDS)
Manual 2100-711C
Page 26 of 45
service technician to override or speed up this timing
period and shorting out the SPEEDUP terminals for a
few seconds can do this.

Low Pressure Switch Bypass Operation

The control has a selectable (SW1) low pressure switch
bypass set up to ignore the low pressure switch input
during the first (30, 60, 120 or 180 seconds) of "Y"
operation.
After this period expires, the control will then monitor
the low pressure switch input normally to make sure
that the switch is closed during "Y" operation.
FIGURE 22
Defrost Control Board
ACCUMULATED DEFROST TIME TIMER
(FACTORY SETTING 60 MIN.)
Model Setting
W42HC
W48HC
W60HC
SW SW
1 2 TIME (SEC)
OFF OFF 30
ON OFF 60
OFF ON 120*
ON ON 180
OFF
ON
MIS-2668 A
60
60
60