Lennox DM User Manual

DC-DM-ROOFTOP-IOM-1801-E - 49 -
CODE DESCRIPTION CONDITION EFFECT RESET POSSIBLE CAUSES POSSIBLE REMEDIES
DS
MENU
328
Circuit 3 Compressor, LOP
operating, (Low Operating
Press.).
The suction temperature
calculated by the LP pressure
sensor is outside of the
permitted range.
Threshold: (HP < 35°C) < -
25°C,
Threshold: (HP < 55°C) < -5°C,
Threshold: (HP > 65°C) <
12.5°C,
Delayed: 1min,
Enabled: 3min after one
compressor or condenser fan
start/stop.
Signalling. Automatic
• Limit indoor/outdoor
temperature conditions,
• Refrigerant charge,
• Problem with the expansion
valve.
• Wait normal tempetaure
conditions,
• Check the circuit operating,
• Replace the expansion valve.
#
329
Circuit 3 Compressor,
Condensing T°, Too High.
The temperature measured by
the probe is outside of the
permitted range.
Threshold: > 61°C,
Delayed: 20s,
Waiting stop: 6min,
Enabled: 3min after one
compressor or condenser fan
start/stop.
Signalling. Automatic
• Limit indoor/outdoor
temperature conditions,
• Refrigerant charge,
• Problem with the expansion
valve.
• Wait normal tempetaure
conditions,
• Check the circuit operating,
• Replace the expansion valve.
#
341
Circuit 3, High Pressure,
Faulty Sensor.
The value of the sensor
measured is incorrect.
Delayed: 15s.
Stop C3
compressors.
Automatic
• Sensor failure,
• Problem with wiring of sensor.
• Check the sensor
• Check the wiring connections.
#
342
Circuit 3, Low Pressure,
Faulty Sensor.
The value of the sensor
measured is incorrect.
Delayed: 15s.
Stop C3
compressors.
Automatic
• Sensor failure,
• Problem with wiring of sensor.
• Check the sensor
• Check the wiring connections.
#
343
Circuit 3, Liquid
Temperature, Probe.
The value of the sensor
measured is incorrect.
Delayed: 15s.
Stop C3
compressors.
Automatic
• Probe failure,
• Problem with wiring of probe.
• Check the probe
• Check the wiring connections.
#
344
Circuit 3, Suction T°, Probe.
The value of the sensor
measured is incorrect.
Delayed: 15s.
Stop C3
compressors.
Automatic
• Probe failure,
• Problem with wiring of probe.
• Check the probe
• Check the wiring connections.
#

Lennox DM Specifications

General

Brand	Lennox
Model	DM
Category	Monitor
Language	English