Carrier 69NT40-541-001, Operation And Service

Page: 61 / 156

4–25 T-316
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 ther-
mostat (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 read-
ing has dropped to 10°C or below. If not, a DTS failure alarm is given
and the defrost mode is operated using the return 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 activation or deactivation. Each phase of the power source is
checked for proper amperage.This alarm is a display alarm with no result-
ing 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) re-
sulting 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 be-
low the user selected 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 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 sensor is out of range. This is a display alarm and has no asso-
ciated failure action.
AL65
Discharge Pressure
Transducer Failure
Alarm 65 is triggered by a compressor discharge transducer reading
outside the valid range of 73.20 cm Hg (30 in Hg) to 32.34 Kg/cm
2
(460
psig). This is a dis play alarm and has no associated failure action.
AL66
Suction Pressure
Transducer Failure
Alarm 66 is triggered by a suction pressure transducer reading outside
the valid range of 73.20 cm Hg (30 in Hg) to 32.34 Kg/cm
2
(460 psig).
This is a display alarm and has no associated failure action.
AL67 Humidity Sensor Failure
Alarm 67 is triggered by a humidity sensor reading outside the valid
range of 0% to 100% relative humidity. If alarm AL67 is triggered when
the dehumidification mode is activated, then the dehumidification mode
will be deactivated.
AL68
Condenser Pressure
Transducer Failure
Alarm 68 is triggered by a condenser pressure transducer reading out-
side the valid range of 73.20 cm Hg (30 in Hg) to 32.34 Kg/cm
2
(460
psig). This is a dis play alarm and has no associated failure action.
AL69
Suction Temperature
Sensor Failure
Alarm 69 is triggered by a suction temperature sensor reading outside
the valid range of -60°C (-76°F) to 150°C (302°F). This is a display alarm
and has no associated failure action.
NOTE
If the Controller is configured for four probes without a DataCORDER, the DataCORDER alarms
AL70 and AL71 will be processed as Controller alarms AL70 and AL71.
Table 4–6 Controller Alarm Indications (Continued)
CODE # TITLE DESCRIPTION