4-4
FIELD WORK INSTRUCTION
4.4 Maintenance Work
(1) For Indoor Unit and Outdoor Unit
(a) Fan and Fan Motor
Lubrication - All fan motors are pre-lubricated and sealed at the factory. Therefore, no lubricating
maintenance is required.
Sound and Vibration - Inspect for abnormal sound and vibration.
Rotation - Inspect for clockwise rotation and rotating speed.
Insulation - Inspect for electrical insulation resistance.
(b) Heat Exchanger
Clog - Inspect and remove any accumulated dirt and dust from the heat exchanger at regular
intervals. As for outdoor unit, other obstacles such as growing grass and pieces of paper, which
might restrict air flow, should also be removed.
(c) Piping Connection
Leakage - Inspect for refrigerant leakage at piping connection.
(d) Cabinet
Stain and Lubrication - Inspect and remove any stain and lubrication.
Fixing Screw - Inspect and fix loosened or lost screws.
Insulation - Inspect and repair peeled thermal insulation material on cabinet.
(e) Electrical Equipment
Activation - Inspect for abnormal activation of the magnetic contactor, auxiliary relay, PCB and
etc.
Line Condition - Pay attention to working voltage, amperage and phase balance. Inspect for
faulty contact caused by loosened terminal connections, oxidized contacts, foreign matter, and
other items. Inspect for electrical insulation resistance.
(f) Control and Protective Devices
Setting - Do not readjust the setting in the field unless the setting is maintained at a point other
than the point listed in “9. SAFETY AND CONTROL DEVICE SETTING” of “TCII”.
(2) For Indoor Unit
(a) Air Filter
Cleaning - Inspect and remove any accumulated dirt and dust according to “Common Chapter -
1.2 Filter Cleaning” of “TCII”.
(b) Drain Pan, Drain-up Mechanism and Drain Pipe
Drain Line - Inspect and clean the condensate drain line at least twice a year.
Drain-up Mechanism - Inspect for activation of drain-up mechanism.
(c) Float Switch
Activation - Inspect for activation of float switch.
(3) For Outdoor Unit
(a) Compressor
Sound and Vibration - Inspect for abnormal sound and vibration.
Activation - Inspect for that the voltage drop of power supply line is within 16% at start and within
2% during operation.
(b) Reverse Valve
Activation - Inspect for any abnormal activating sound.
(c) Strainer
Clog - Inspect for that no temperature difference between both ends.
(d) Earth Wire
Earth Line - Inspect for continuity to the earth.
(e) Oil Heater
Activation - The oil heater should be activated at least 12 hours before start-up, by switching ON
the main power source.
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