6.2. Preventive Maintenance – Frequency Schedule
WEEKLY
1 - Clean or change the air return filter.
2 - Inspect the general conditions, the tensioning and the alignment of the compressor and alternator belts.
MONTHLY
1 - Perform the weekly preventive maintenance routines.
2 - Clear the condenser coil. (Use only mild soap and water, not abrasive to cooper and aluminum).
3 - Check the evaporator hoods closure to prevent the entry of false air into the equipment.
4 - Check the refrigerant gas load: After 15 minutes of operation the refrigerant must flow through sight glass
without bubbles.
5 - Check the compressor oil level: After 15 minutes of operation it must be between 3/4 and 1/4 of the sight glass.
6 - Test the equipment functions: cooling mode/ ventilation mode (high and low speed)/ heating/ air refreshment.
QUARTERLY
1 - Perform the monthly preventive maintenance routines.
2 - Measure the suction and discharge pressure and check the temperature and condition of the suction line.
3 - Tighten the alternator power cables, main fuse, relay plate and starter.
4 - Measure the current consumption of the condenser fans and the evaporator blower (check the air flow).
5 - Measure the magnetic resistance of the clutch.
6 - Measure the voltage and current of the alternator.
EVERY SIX
MONTHS
1 - Perform the quarterly preventive maintenance routines.
2 - Clean the evaporator coil (use only mild soap and water, not abrasive to cooper and aluminum).
3 - Clean the evaporator drains.
4 - Check the retention of oil felt of compressor sealing.
5 - Visually check the air conditioner components to see whether they show signs of leaking refrigerant and oil.
6 -
Observe if there are parts loose, damaged, broken or showing signs of wear, rust, deterioration and friction with
the body.
ANNUAL
1 - Perform the six months preventive maintenance routines.
2 - Test compressor efficiency at 1500 rpm.
3 - Check the compressor oil pump pressure at 1000 rpm.
4 - Check the open and closure pressure of the high and low pressure switches.
5 - Tighten all screws from the compressor support and the unit, observing the applied torques.
6 - Remove dirt deposited on the components condenser, controller, relay plate, compressor, clutch, alternator.
All preventive maintenance described in this manual is considered for operating under normal conditions. Should the conditions be
other than expected and environmental contamination a possibility, the frequency of actions must be more intense.
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