4–25
T-354
AL54
Primary Supply
Temperature Sensor
Failure (STS)
Alarm 54 is activated by an invalid primary supply temperature sensor reading
that is sensed outside the range of -50 to +70
C (-58
F to +158
F) or if the probe
check logic has determined there is a fault with this sensor.
If Alarm 54 is activated and the primary supply is the control sensor, the second-
ary supply sensor will be used for control if the unit is so equipped. If the unit does
not have a secondary supply temperature sensor, and AL54 is activated, the pri-
mary return sensor reading, minus 2
C will be used for control.
NOTE
The P5 Pre-Trip test must be run to inactivate the alarm
AL56
Primary Return
Temperature Sensor
Failure (RTS)
Alarm 56 is activated by an invalid primary return temperature sensor reading that
is outside the range of -50 to +70
C (-58
F to +158
F). If Alarm 56 is activated and
the primary return is the control sensor, the secondary return sensor will be used for
control if the unit is so equipped. If the unit is not equipped with a secondary return
temperature sensor or it fails, the primary supply sensor will be used for control.
NOTE
The P5 Pre-Trip test must be run to inactivate the alarm.
AL57
Ambient Temperature
Sensor Failure
Alarm 57 is triggered by an ambient temperature reading outside the valid range
from -50 to +70
C (-58
F to +158
F).
AL58
Compressor High
Pressure Safety
Alarm 58 is triggered when the compressor high discharge pressure safety switch
remains open for at least one minute. This alarm will remain active until the pres
sure switch resets, at which time the compressor will restart.
AL59
Heat Termination
Thermostat
Alarm 59 is triggered by the opening of the heat termination thermostat and will
result in the disabling of the heater. This alarm will remain active until the thermo
stat resets.
AL60
Defrost Temperature
Sensor Failure
Alarm 60 is an indication of a probable failure of the defrost temperature sensor
(DTS). It is triggered by the opening of the heat termination thermostat (HTT) or
the failure of the DTS to go above set point within two hours of defrost initiation.
After one-half hour with a frozen range set point, or one-half hour of continuous
compressor run time, if the return air falls below 7
C (45
F), the Controller checks
to ensure the DTS reading has dropped to 10
C or below.
If not, a DTS failure alarm is given and the defrost mode is operated using the re-
turn temperature sensor. The defrost mode will be terminated after one hour by
the Controller.
AL61 Heaters Failure
Alarm 61 is triggered by detection of improper amperage resulting from heater ac-
tivation or deactivation. Each phase of the power source is checked for proper
amperage.This alarm is a display alarm with no resulting failure action, and will
be reset by a proper amp draw of the heater.
AL62
Compressor Circuit
Failure
Alarm 62 is triggered by improper current draw increase (or decrease) resulting
from compressor turn on (or off). The compressor is expected to draw a mini mum
of 2 amps; failure to do so will activate the alarm.This is a display alarm with no as-
sociated failure action and will be reset by a proper amp draw of the compressor.
AL63 Current Over Limit
Alarm 63 is triggered by the current limiting system. If the compressor is ON and
current limiting procedures cannot maintain a current level below the user select-
ed limit, the current limit alarm is activated.
This alarm is a display alarm and is inactivated by power cycling the unit, chang-
ing the current limit via the code select Cd32, or if the suction modulation valve
(SMV) is open beyond the controller desired point.
AL64
Discharge
Temperature
Over Limit
Alarm 64 is triggered if the discharge temperature sensed is greater than 135
C
(275
F) for three continuous minutes, if it exceeds 149
C (300
F), or if the sen sor
is out of range. This is a display alarm and has no associated failure action.
Table 4–6 Controller Alarm Indications (Continued)
CODE
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