Carrier 69NT40-489-100 Series, Operation And Service Manual

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36 T-305
Table 7 Controller Alarm Indications (Sheet 2 of 3)
AL53 Battery Pack Failure
Alarm 53 is caused by the battery pack charge being too low to provide sufficient
power for battery-backed recording. Renew replaceable batteries. If this alarm
occurs on start up, allow a unit fitted with rechargeable batteries to operate for up
to 24 hours to charge rechargeable batteries sufficiently to deactivate the alarm
AL54
Primary Supply Tem-
perature 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 secondary supply sen-
sor 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 primary return
sensor reading, minus 2
_
C will be used for control.
NOTE
The P5 Pre-Trip test must be run to inactivate the alarm
AL55 DataCORDER
Failure
This alarm activates to indicate the DataCORDER has a software failure. To clear
this alarm, reconfigure the unit to the current model number. This failure may be
the result of a voltage dip in excess of 25%.
AL56
Primary Return Tem-
perature 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 acti-
vated 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 Tempera-
ture Sensor Failure
Alarm 57 is triggered by an ambient temperature reading outside the valid range
from --50
_
C (--58
_
F) to +70
_
C (+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 return tempera-
ture 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
activation 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 associated 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 se-
lected limit, the current limit alarm is activated.This alarm is a display alarm and
is inactivated by power cycling the unit, changing the current limit via the code
select Cd32, or if the suction modulation valve (SMV) is open beyond the control-
ler desired point.