Lennox CLIMATIC series User Manual page 44

COMMUNICATION
ALARM 001:
BLOWER, FLOW SWITCH CUT OFF
Description
The differential pressure between the treatment unit and the fi lters is too small, although the fan has been running for more than 3
minutes.
Action
Immediate shut down of the complete unit.
Reset
Once the fl ow has been detected for 2 minutes, the alarm is automatically deleted. Up to 3 trips can occur during a day and are saved
in the alarm history. The two fi rst trips don't give the alarm alert, and the alarm counter is reset every day at 11 am. The third trip
activates the fault report and must be manually reset.
Possible cause(s)
• Air system obstructed or closed,
• Belts broken,
• Problem with the fan wiring,
• Problem with the pressure transmitter wiring,
• Incorrect settings of the safety threshold.
Remedies
• Check the system,
• Replace the belts,
• Check the connections,
• Check the settings.
ALARM 002:
WATER CONDENSER, FLOW SWITCH CUT OFF
Description
The fl ow switch has detected a low water fl ow rate in the condenser heat exchanger for more than 20 seconds whereas the unit was
enabling.
Action
Immediate shut down of the compressors.
Reset
Once the fl ow has been detected for 2 minutes, the alarm is automatically deleted. Up to 3 trips can occur during a day and are saved
in the alarm history. The two fi rst trips don't give the alarm alert, and the alarm counter is reset every day at 11 am. The third trip
activates the fault report and must be manually reset.
Possible cause(s)
• Problem with the pump control wiring,
• Problem with the fl ow switch wiring,
• Dirty or clogged water fi lter,
• Wrong setting of the fl ow switch,
Remedies
• Check the pump connections,
• Check the fl ow switch connections,
• Clean the water fi lter,
• Check the fl ow switch settings.
• 42 • CLIMATIC RT_UNITARY-IOM-1508-E