Lennox DM - Page 47

DC-DM-ROOFTOP-IOM-1801-E - 45 -
CODE DESCRIPTION CONDITION EFFECT RESET POSSIBLE CAUSES POSSIBLE REMEDIES
DS
MENU
222
Circuit 2, Superheat T°, Too
High.
The value calculed is outside of
the permitted range.
Threshold: (LP < 5°C) < 15K,
Threshold: (LP > 5°C) < 25K,
Delayed: 6min,
Waiting stop: 6min,
Enabled: 6min after one
compressor start, then 3min
after one compressor or
condenser fan start/stop.
Stop C2
compressors.
3/day
• Limit indoor/outdoor
temperature conditions,
• Refrigerant charge,
• Problem with the expansion
valve.
• Wait normal tempetaure
conditions,
• Check the circuit operating,
• Replace the expansion valve.
[2636]
223
Circuit 2, Subcooling, Too
Low.
The value calculed is outside of
the permitted range.
Threshold: < 0.6K,
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.
[2643]
224
Circuit 2, 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.
[2643]
227
Circuit 2 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.
[2442]
and
[2444]
228
Circuit 2 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.
[2442]
and
[2444]