Carrier 69NT40-541-001 Operation And Service page 61

CODE # TITLE
Defrost Temperature
AL60
Sensor Failure
AL61 Heaters Failure
AL62 Compressor Circuit Failure
AL63 Current Over Limit
Discharge Temperature
AL64
Over Limit
Discharge Pressure
AL65
Transducer Failure
Suction Pressure
AL66
Transducer Failure
AL67 Humidity Sensor Failure
Condenser Pressure
AL68
Transducer Failure
Suction Temperature
AL69
Sensor Failure
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)
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.
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.
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.
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.
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.
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
psig). This is a dis play alarm and has no associated failure action.
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
This is a display alarm and has no associated failure action.
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.
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
psig). This is a dis play alarm and has no associated failure action.
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
DESCRIPTION
4–25
2
(460
2
(460 psig).
2
(460
T-316