Lennox DM User Manual

DC-DM-ROOFTOP-IOM-1801-E - 47 -
CODE DESCRIPTION CONDITION EFFECT RESET POSSIBLE CAUSES POSSIBLE REMEDIES
DS
MENU
314
Circuit 3, Compressor,
Electrical Failure.
An electrical failure happened
in the compressors of the
circuit.
Waiting stop: 30min,
Enabled: 5s after one
compressor start.
Stop C3
compressors.
3/day
• Problem with wiring
connection, pressure switch or
compressor internal safety
switch
• Coil condenser dirty,
• Fan condenser not operating.
• Check the wiring connection,
• Clean the coil condenser,
• Check the fan operating.
#
315
Circuit 3, Safety High
Pressure, Cut-off.
The condensing pressure read
by the pressure transducer
exceeds the maximum limit.
Threshold: > 42bar/64°C,
Waiting stop: 30min,
Enabled: 5s after one
compressor start.
Stop C3
compressors.
3/day
• Too much Refrigerant charge,
• Problem with wiring
connection, pressure
transducer
• Coil condenser dirty,
• Fan condenser not operating.
• Check the circuit operating,
• Check the wiring connection,
• Clean the coil condenser,
• Check the fan operating.
#
316
Circuit 3 Compressor, Delta
Pressure (HP-LP), Too Low.
The Δp(|High-Low|) pressure is
lower than the safety limit.
Threshold: < 1bar,
Delayed: 5s,
Waiting stop: 1min,
Enabled: 1min after one
compressor start.
Stop C3
compressors.
3/day
• Electric circuit breaker cut,
• Problem with wiring
connection,
• Reversing valve locked
• Check the compressor,
• Check the wiring connection,
• Check the reversing valve
swap
#
317
Circuit 3, Safety Low
Pressure, Cut-off.
The suction temperature
calculated by the LP pressure
sensor is lower than the
permitted threshold.
Threshold: < -27°C,
Delayed: 2min,
Waiting stop: 30min,
Enabled: 6min after one
compressor start.
Or
Threshold: < -33°C,
Delayed: Immediately,
Enabled: immediately.
Stop C3
compressors.
3/day
or
Manually
• Refrigerant charge • Check the circuit operating #
319
Circuit 3 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.
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.
#

Lennox DM Specifications

General

Brand	Lennox
Model	DM
Category	Monitor
Language	English