Lennox International Inc WING manual Maintenance of the Unit Possible Problems Solution

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MAINTENANCE OF THE UNIT

POSSIBLE PROBLEMS

PROBLEM

 

SOLUTION

 

 

 

 

 

1.- Unit do not work.

• Check electrical supply of the unit.

• Check electrical connexion.

 

• Check the remote controller and parameter works correctly.

 

 

 

2.- The fan of the unit

 

 

works quicker without any

• Check that the filter of the unit is clean.

￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿

• Check electrical connexion.

 

• If the problem persist, check the function of the motor.

 

 

 

3.- Noise on pipe system.

 

 

NOTE: Some noises are

• Check refrigerant charge is correct.

normal when unit stop and

• Was the vacuum done correctly?

￿￿￿￿￿￿

• Check internal temperature, could be quite low.

 

 

 

• Check possible obstructions in the condensate pan, and also out of the pan.

4.- Excess of condensation

• Check correct level of the unit.

￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿

• Check drainage pipe.

 

 

 

• Check the air filter of the indoor unit.

5.- The indoor battery

• Check the level of refrigerant.

• Check strangulation air flow or recirculation.

freeze continuously.

• If the freeze persist the expansion can be obstructed.

 

 

• ¿Is the temperature below 21 º C?

 

• Check indoor temperature sensor.

 

 

 

6.- Unit work perfectly on

• Check if you have configurate correctly the function mode of the unit.

cooling mode, but do not

• Check inverter valve of the outdoor unit.

produce heat on mode heat

• Check the plate PCB to the solenoid inverted valve.

￿￿￿￿

 

 

 

 

 

 

Check that terminal connexion are slack.

7.-External fan stop

Check the motor.

• Check the condenser situation.

 

 

• Check that that the rele of defrost is not activited

 

(Units heat pump).

 

 

 

8.-Excessive pressure of

Check that the external exchanger is not dirty and obstructed.

condensation (Working

Check that there is no condensable gas and air in the refrigerant circuit.

cooling cycle)

Check that the external fan works correctly.

 

Check that the refrigerant charge is correct

 

 

 

9.-Low pressure

Check that the refrigerant charge is correct

Check possible obstruction on the expansion system of the outdoor unit, liquid

condensation.

￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿

(Working on cooling

Check that air filter is not dirty or wrong function of indoor fan.

cycle)

 

 

 

 

 

10.-Excessive pressure

Check that the refrigerant charge is correct

on return air (Working

Check the situation of inverter valve.

on heat pump)

Check retention valve situation.

 

 

 

11.-Low pressure on

Check that the refrigerant charge is correct

return air. (working

Check possible obstruction on the expansion system of the outdoor unit

on heat pump)

Check that the external fan works correctly.

 

Check the correct function of the defrost thermostat .

 

 

 

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Contents Application Page Contents Páge Cooling only R-407C Product RangeLTX Indoor Unit in COMBINATION, with Axial FAN Outdoor Unit Heat Pump R-22C Product Range Heat PumpOn OFF System Configuration Indoor UnitSwitch Model Cooling only OFF Heat PumpOutdoor Unit General Description Indoor Unit LTXOutdoor Unit KJF/KJB Outdoor Unit Type KJF/KJBOutdoor Unit Specifications Cooling onlyModel Indoor UnitWeight Outdoor Unit with Centrifugal FANSpecifications Heat Pump 3CB 4CB 5CB Sound Level SET with Axial FAN Outdoor UnitSound Level SET with Centrifugal FAN Outdoor UnitElectric Wiring Diagram Number of Wires X SectionElectrical Connections and System Configuration LTX Outdoor Unit Cooling onlyHeat Pump LTXAIR Flow Outdoor Unit MOTOR-FAN CharacteristicsKCF 3K / KCB 3S KCF 4K / KCB 4S KCF 5K / KCB 5SOperating Limits Cooling only Units StandardOperating Limits Heat Pump Units Outdoor Unit IndoorYES Distances Between Units Outdoor U Indoor U Indoor Unit ModelOutdoor Units Tipo KCF-K/ KCB Outdoor Units Type KJF-K/ KJBModel ExampleKCF-K KCB-S Setting UPMaximum Dimensions AIR OUT Standard OptionalAccess to Electrical BOX Description Outdoor Unit KCF-K / KCB 2,8-3AIR Standard 810 Description Outdoor Unit KCF / KCB-S 4Entrance STANDARD/ Optional Outdoor Unit KCF-K / KCB KJF-K Dimensions and Setting Templates of Indoor Unit LTXKJF-K KJB LTXAIR-SWEEP Installation Indoor UnitInstallation Unit Opening in Flase CeilingIndoor Unit Optionals Electrical Heater Outdoor Unit Optionals Main Switch Winter ControlMaintenance of the Unit Possible Problems Solution Standard Guidelines to Lennox Refac equipment Page Page W. L e n n oxe u ro p e . c o m