Bard W48A2PQ, Installation And Service Instructions Manual

Page: 60 / 82

Manual 2100-642
Page 60 of 82
Signal Description Possible Cause Component to Check Recommended Action
Device
Actions
Low Pressure
Alarm
If the alarm activates
once or twice in
an hour, it is reset
automatically. If it
occurs three times
in an hour, the
compressor and
condenser fan are
locked.
Lack of refrigerant
Run the unit and
check if the low
pressure value is in
the normal range.
Charge appropriate
amount of
refrigeration. Compressor/
Condensor Fan:
Off
The switch is defective.
Check if the pressure
switch is OK.
If defective, replace.
Check if the
connection to the
corresponding input
terminal is ok or if
the controller board is
defective.
Check if the
connection is OK.
Check is the
controller board is
OK.
Reconnect the cables.
If the PLC controller
is defective, replace.
High Pressure
Alarm
If the alarm activates
once or twice in
an hour, it is reset
automatically. If it
occurs three times
in an hour, the
compressor and
condenser fan are
locked.
Abnormal site
condition
Check open door or
for abnormal site
condition. Check if
the high pressure
value is in the normal
range.
Clean the condenser.
Compressor/
Condensor Fan:
Off
Condenser fan has
failed. The condenser
fan speed controller
has failed.
Check the condenser
fan status while the
high pressure is
outside the normal
setting.
Replace the
condenser fan.
Replace the
condenser low
ambient (fan speed)
controller.
The switch is defective.
Check if the high
pressure switch is
OK.
If defective, replace.
Check if the
connection to the
corresponding input
terminal is ok or if
the controller board is
defective.
Check if the
connection is OK.
Check is the
controller board is
OK.
Reconnect the cables.
If the PLC controller
is defective, replace.
Dirty Air Filter
Alarm
The alarm is a warning
to check the filter.
Alarm can only be
reset manually.
Filter is clogged.
Check if the filter is
dirty. Clean or replace the
filter.
Check if the
connection to the
corresponding input
terminal is OK or if the
PLC controller board is
defective.
Check if the
connection is OK.
Reconnect the cable.
If the PLC controller
board is defective,
replace.
The value set for the
differential air pressure
switch is too low. Check the differential
air pressure switch
value. Correct the value of
the switch to standard
value.
Free Cooling
Damper Fails to
Open Alarm
Alarm is reset
automatically. DC free cooling damper
fails to open.
Check the damper
linkage. Check to see
if anything is in the
way of the damper.
Indoor Blower:
On
Damper: Off
TROUBLESHOOTING TEC-EYE ALARMS