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Field Work Instruction
5.2 Maintenance Work
(1) For Outdoor Unit and Indoor 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
● Clogging - Inspect the heat exchanger and remove any accumulated dirt or 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 ow,
should also be removed.
(c) Piping Connection
● Leakage - Inspect for refrigerant leakage at piping connections.
(d) Cabinet
● Stain and Lubrication- Inspect and remove any stain or lubrication.
● Fixing Screw - Inspect and x 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 contractor, 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 eld unless the setting is maintained at a point other than the point listed in
“Safety and Control Device Setting” of TC.
(2) For Outdoor Unit Only
(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) Reversing Valve
● Activation - Inspect for any abnormal activating sound.
(c) Strainer
● Clog - Inspect for that no temperature dierence between both ends.
(d) Earth Wire
● Earth Line - Inspect for continuity to the earth.
(e) Crankcase Heater
● Activation - The crankcase heater should be activated at least 12 hours before start-up, by switching ON the main
power supply.
(3) For Indoor Unit Only
(a) Air Filter
● Cleaning - Inspect and remove any accumulated dirt or dust according to “Filter Cleaning” of manual.
(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 oat switch
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