Bard PH13242-A Installation Instructions Manual - page 21
Manual 2100-468J
Page
21 of 29
There is an initiate defrost jumper (sen jump) on the control
that can be used at any outdoor ambient during the heating
cycle to simulate a 0° coil temperature.
This can be used to check defrost operation of the unit
without waiting for the outdoor ambient to fall into the
defrost region.
By placing a jumper across the
SEN JMP
terminals (a
¼ inch QC terminal works best) the defrost sensor mounted
on the outdoor coil is shunted out & will activate the timing
circuit. This permits the defrost cycle to be checked out in
warmer weather conditions without the outdoor temperature
having to fall into the defrost region.
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 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.
High Pressure Switch Operation
- The control has a built-in
lockout system that allows the unit to have the high pressure
switch trip up to two times in one hour and only encounter
a “soft” lockout. A “soft” lockout shuts the compressor off
and waits for the pressure switch to reset, which at that point
then allows the compressor to be restarted as long as the
5-minute short cycle timer has run out. If the high pressure
switch trips a third time within one hour, the unit is in
“hard” lockout indicating something is certainly wrong and
it will not restart itself.