Lennox FWCK User Manual

13
•The unit under supply, has rotating objects and generates high temperatures into the pipes.
FAILURE DIAGNOSIS
SERVICE AND MAINTENANCE
(*) Reset the unit, turning the power off/on after the cause which produced the cut on high/low pressure switch has been repaired.
• Air filter: Clean the filter periodically (maximum each 6 months), but the clean of the filter depends on the ambient where the
unit is working.
Make sure to turn off electrically the unit before to access for maintenance or revision.
PROBLEMS CAUSES
• Low pressure cut (electrical reset) (*).
• Low cooling capacity.
• Freeze on coil.
• Very low air inlet temperature.
• Low air flow, due to dirty air filter, or wrong design of ducts.
• Very low water inlet temperature.
• There is not enough refrigerant (Check leaks).
• Very high water inlet temperature.
• Low water flow or water flow interruption (check water pump
selection, water valve regulation or water filter cleaning).
• Very high air temperature.
• There is a lot of refrigerant.
• High pressure cut (electrical reset) (*).
• High consumption.
• Thermal compressor protection cut.
• Low pressure cut (electrical reset) (*).
• Low evaporating temperature cut (*).
• Flow water cut (*).
• Low water flow or water flow interruption (check water pump
selection, water valve regulation or water filter cleaning).
• Very low water inlet temperature.
• There is not enough refrigerant (Check leaks).
• Very low air inlet temperature.
• Check expansion valve regulation.
• High pressure cut (electrical reset) (*).
• High consumption.
• Compressor thermic protection cut.
• Very high water inlet temperature.
• Very high air inlet temperature.
• Low air flow, due to dirty air filter or wrong design of ducts.
• There is a lot of refrigerant.
• Security elements: The unit includes electrical elements of security (Internal thermal protections on the compressor and motor
fan, external thermal protections on the compressor and three-phase motor) and cooling elements of security like high and
low pressure switches with electrical reset. Heat pump units include as standard a differential water switch in the water circuit.
If unit operating limits are out of working conditions, some protections will be on.
• Water filter: Clean the filter periodically.
COOLING MODE
(FWCK/FWHK)
HEATING MODE
(FWHK)
Risk of evaporator freezing.

Lennox FWCK Specifications

General

Brand	Lennox
Model	FWCK
Category	Air Conditioner
Language	English