Preventive Maintenance - Lennox CMC 020S Installation, Operating And Maintenance Manual

4.- MAINTENANCE

4.1.- PREVENTIVE MAINTENANCE

- AIR FILTER :
The air fi lter can be removed through the side by sliding it over the rail or downwards.
(See fi gure).
For downwards removal, remove the two profi les that support it (depending on the model)
which are under the fi lter guide rail and screwed onto the unit.
The fi lter should be cleaned with a vacuum cleaner or washed in soapy water.
The frequency for cleaning or changing the air fi lters will depend on the quality air in the area (fumes, vapors, suspended dust
particles, etc.).
Remember that the metal grille should always be toward the inside of the unit.
- GENERAL STATE OF THE CASING:
Furniture, paint, damage due to shocks, rust spots, levelling and supporting, condition of the shock
absorbers, if installed, screwed panels, etc.
- ELECTRICAL CONNECTIONS:
State of hoses, tightness of screws, earthing, current consumption of the compressor and fans and check
that the unit is receiving the correct voltage.
- COOLING CIRCUIT:
Check that the pressures are correct and that there are no leaks. Check that there is no damage to the
pipe insulation, that the condition of the coils is good and that they are not blocked by bits of paper or
plastic drawn in by the air fl ow, etc.
- COMPRESSOR:
If a sight glass is fi tted, check the oil level.
Check the condition of the silentbloc mountings.
- FANS:
Check that fans turn freely and in the correct direction without excessive noise.
- CONTROL:
Check Set Points and normal operation.
4.2.- CORRECTIVE MAINTENANCE
MAKE SURE THAT THE UNIT IS FULLY DISCONNECTED FROM THE POWER SUPPLY WHEN CARRYING OUT
If any component in the cooling circuit is to be replaced, follow these recommendations:
- Always use original replacement parts.
- If the component can be isolated, it is not necessary to remove the entire refrigerant charge, if the component cannot be isolating
and the refrigerant charge is removed, it should be removed through the Schrader valves located in the outdoor section. Create a
slight vacuum as a safety measure.
- Regulation prohibits the release of refrigerant into the atmosphere.
- If cuts must be made in the pipe work, use pipe cutters. Do not use saws or any other tools that produce fi lings.
- All brazing must be carried out in a nitrogen atmosphere to prevent corrosion forming.
- Use silver alloy brazing rod.
- Take special care that the fl ame from the torch is directed away from the component to be welded and cover with a wet rag to
prevent overheating.
PREVENTIVE MAINTENANCE PREVENTS COSTLY REPAIRS.
THIS REQUIRES PERIODIC INSPECTIONS:
IMPORTANT
ANY TYPE OF WORK ON THE MACHINE.
Wet rag
Nitrogen
30
SIDE
REMOVAL
Direction of the fl ame
Silver alloy welding rod
Component to be welded