12.6 Maintenance work
For outdoor and indoor units
(A) Fan and fan motor.
•
Lubrication. All the fan motors are lubricated and sealed in the factory. Consequently, lubrication is not necessary.
•
Noise and vibrations. Check there are no strange noises or vibrations.
•
Rotation. Check that fan rotates clockwise and that the speed is suitable.
•
Insulation. Check the electric insulation resistance.
(B) Heat exchanger.
•
Clogging. Check regularly that there is no accumulated dirt or dust. Regarding the outdoor unit, also check there are
no obstacles for the air circulation such as pieces of paper, twigs, grass, etc. If necessary, remove them.
(C) Pipe connection.
•
Leakage. Check there is no leakage in the connections of the refrigerant pipes.
(D) Cabinet.
•
Stains and lubricant. Check there are no stains or lubricant.
•
Tightening of screws. Check all screws are correctly tightened. If not, tighten them to the prescribed torque.
•
Insulation. Check for imperfections in the thermal insulation of the unit cabinet and repair if necessary.
(E) Electrical equipment.
•
Activation. Check the normal operation of the magnetic contactor, auxiliary relay, PCB, etc.
•
State of the power supply line. Check the power supply, the current consumption (amperage) and the phase balance
in particular. Check that there are no contact faults caused by loose terminals, rusty contacts, foreign objects or other
causes. Check the electric insulation resistance.
(F) Control and protection devices.
•
Setting. Do not readjust the setting in the field, except those indicated in section
, see on page 111
.
Only for outdoor units
(A) Compressor.
•
Noise and vibrations. Check there are no strange noises or vibrations.
•
Activation. Check that the voltage drop of the power supply line is within 16% at start-up and within 2% during operation.
(B) Reversing valve.
•
Activation. Check there is no abnormal activation noise.
(C) Filter.
•
Clogging. Check there are no differences in temperature between the two ends.
(D) Earthing connection wire.
•
Earth line. Check the continuity to earth.
(E) Compressor crankcase heater.
•
Activation. The crankcase heater should be activated at least 12 hours before start-up, by switching ON the main power
source.
Only for indoor units
(A) Air filter.
•
Cleanliness. Check regularly that there is no accumulated dirt or dust.
(B) Drain pan, drain-up mechanism and drain pipe.
•
Drain line. Check and clean the drainage system at least twice a year.
•
Drain-up mechanism. Check the activation of the drain-up mechanism.
(C) Float switch.
•
Activation. Check the activation of the float switch.
12 Maintenance notes
354
SMGB0065 rev. 1 - 12/2010
