Lennox DM - Page 42

DC-DM-ROOFTOP-IOM-1801-E - 40 -
CODE DESCRIPTION CONDITION EFFECT RESET POSSIBLE CAUSES POSSIBLE REMEDIES
DS
MENU
118
Circuit 1, Water Evaporator,
Risk of Frosting.
The suction temperature
calculated by the LP pressure
sensor is lis too low and may
pose a risk for the water
evaporator.
Threshold: [3513] 0% Glycol <
0°C,
Threshold: [3513] 50% Glycol <
-20°C,
Delayed: 5s,
Waiting stop: 6min,
Enabled: 2s after one
compressor start in heating
mode.
Stop C1
compressors.
6/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.
[2412]
119
Circuit 1 Compressor,
Condensing T°, Too Low.
The temperature measured by
the probe is outside of the
permitted range.
Threshold: < 21.5°C,
Delayed: 6min,
Waiting stop: 30min,
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]
121
Circuit 1, Superheat T°, Too
Low.
The value calculed is outside of
the permitted range.
Threshold: < [3621] - 3K,
Delayed: 6min,
Waiting stop: 6min,
Enabled: 6min after one
compressor start, then 3min
after one compressor or
condenser fan start/stop.
Stop C1
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.
[2616]
122
Circuit 1, 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 C1
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.
[2616]
123
Circuit 1, 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.
[2623]