Lennox DM User Manual

DC-DM-ROOFTOP-IOM-1801-E - 41 -
CODE DESCRIPTION CONDITION EFFECT RESET POSSIBLE CAUSES POSSIBLE REMEDIES
DS
MENU
124
Circuit 1, Subcooling, Too
high.
The value calculed is outside of
the permitted range.
Threshold: > 16K,
Delayed: 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.
[2623]
127
Circuit 1 Compressor, MOP
operating, (Max Operating
Press.).
The suction temperature
calculated by the LP pressure
sensor is outside of the
permitted range.
Threshold: (HP < 20°C) < 5°C,
Threshold: (HP > 45/30°C) <
26/15°C,
Delayed: 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.
[2412]
and
[2414]
128
Circuit 1 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.
[2412]
and
[2414]
129
Circuit 1 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.
Stop C1
compressors.
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.
[2414]
130
Circuit 1 Compressor,
Discharge T°, Too High.
Over-temperature detected on
the 1st circuit discharge
temperature.
Threshold: > 140°C,
Delayed: 20s,
Waiting stop: 6min,
Enabled: 5s after one
compressor start.
Stop C1
compressors.
3/day • Compressor failure • Check the compressor
[2426]
[2436]
132
Circuit 1, Elec. Expansion
Valve, Motor.
The driver of EEV signals a
failure on the system.
Delayed: 1s.
Stop C1
compressors.
Automatic • EEV failure • Check the EEV #
141
Circuit 1, High Pressure,
Sensor.
The value of the sensor
measured is incorrect.
Delayed: 15s.
Stop C1
compressors.
Automatic
• Sensor failure,
• Problem with wiring of sensor.
• Check the sensor
• Check the wiring connections.
[2414]

Lennox DM Specifications

General

Brand	Lennox
Model	DM
Category	Monitor
Language	English