Bard MULTI-TEC W18AAPA Installation And Service Instructions Manual page 41

TROUBLESHOOTING MULTI-TEC WALL-MOUNT UNIT ALARMS
In the event that a problem is encountered with a wall-mount unit, the TEC-EYE
diagnose the cause. If the problem can't be resolved using these guidelines, contact the BARD Technical Service
Department at 419.636.0439 for assistance.
Signal Description
Alarm is activated
when a low pressure
Low Pressure event is present in the
Alarm refrigeration system
and the compressor is
running.
Alarm is activated
High Pressure when a high pressure
Alarm event is present in the
refrigeration system.
The alarm is a warning
Dirty Air Filter to check the filter.
Alarm Alarm can only be
reset manually.
Low temperature
Freeze Alarm detected at evaporator
coil.
Possible Cause Component to Check
Run the unit and
check if the low
Lack of refrigerant
pressure value is in
the normal range.
Check if the pressure
The switch is defective.
switch is OK.
Connection to the
corresponding Check if the
input terminal is connection is OK.
disconnected or the Check if the controller
controller board is board is OK.
defective.
Check open door or
for abnormal site
Abnormal site condition. Check if
condition the high pressure
value is in the normal
range.
Check the condenser
Condenser fan has
fan status while the
failed. The condenser
high pressure is
fan speed controller
outside the normal
has failed.
setting.
Check if the high
The switch is defective. pressure switch is
OK.
Connection to the
corresponding Check if the
input terminal is connection is OK.
disconnected or the Check if the controller
controller board is board is OK.
defective.
Check if the filter is
Filter is clogged.
dirty.
Connection to the
corresponding Check if the
input terminal is connection is OK.
disconnected or the Check if the controller
controller board is board is OK.
defective.
The value set for the Check the differential
differential air pressure air pressure switch
switch is too low. value.
Low airflow Blower
Space temperature
Low load
input
hand-held tool may be used to
TM
Recommended Action
Charge appropriate Compressor/
amount of Condensor Fan:
refrigeration. Off
If defective, replace.
Repair connection. If
the controller board is
defective, replace.
Compressor/
Clean the condenser. Condensor Fan:
Off
Replace the
condenser fan.
Replace the
condenser low
ambient (fan speed)
controller.
If defective, replace.
Repair connection. If
the controller board is
defective, replace.
Clean or replace the
filter.
Repair connection. If
the controller board is
defective, replace.
Correct the value of
the switch to standard
value.
Ensure blower is
operating correctly.
Compressor: Off
Blower: On
Ensure sensor is
operating correctly.
Manual 2100-665A
Page
Device
Actions
41 of 51