4–39
T-340
AL17
Compressor
Pressure Delta
Fault
Compressor has at
-
tempted to start in both
directions and fails to
generate sufficient
pressure differential
between SPT and
DPT.
N/A
Controller will attempt
restart every 20 minutes
and deactivate the alarm
if successful.
Resume normal
operation.
Discharge Pres
-
sure Transducer
(DPT)
Confirm accurate DPT
pressure readings, refer
to MANIFOLD GAUGE
.
Replace DPT if defec
-
tive.
Suction Pressure
Transducer (SPT)
Confirm accurate SPT
pressure readings, refer
to MANIFOLD GAUGE
.
Replace SPT if defec
-
tive.
Monitor Unit
Alarm is display only the
alarm may clear itself
during operation.
If alarm remains active
or is repetitive replace
compressor at next
available opportunity.
AL18
Discharge
Pressure High
Discharge pressure is
over the maximum for
10 minutes within the
last hour.
Restrictions in the
refrigeration sys
-
tem.
Ensure Liquid Line Ser
-
vice Valve is fully open.
Open Liquid Line Ser
-
vice Valve as needed.
Filter Drier
Check the filter drier, if it
is iced up or very cold it
indicates that the filter
drier needs replacement.
Replace the filter drier if
needed, refer to FILTER
DRIER Service
Condenser Fan
Check Condenser Fan
for proper operation.
Correct as required.
Discharge Pres
-
sure Transducer
(DPT)
Confirm accurate DPT
pressure readings, refer
to MANIFOLD GAUGE
.
Replace DPT if defec
-
tive.
Non-condens
-
ables in the refrig
-
eration system.
With the unit off allow
system to stabilize to
ambient temperature.
Check system pressure
against PT Chart for
Correct as required, re
-
fer to Refrigerant Charge
.
Refrigerant
Check refrigerant level. Correct as required, re
-
fer to Refrigerant Charge
.
Table 4–6 Controller Alarm Indications
Alarm Code
Cause
Components
Troubleshooting
Corrective Actions
