6-4
SM-18006
FIELD WORK INSTRUCTIONS
6.4 Maintenance Work for Cycle Operation
(1) For Water Source 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 sounds or vibration.
•
Rotation - Check that the fan rotates counterclockwise and inspect the rotating speed.
•
Insulation - Inspect for electrical insulation resistance.
(b) Heat Exchanger
• Clogging - Inspect for any accumulated dirt and dust and remove any at regular intervals. As for a
water source unit, inspect for any accumulated scale formed.
(c) Piping Connection
•
Leakage - Inspect for refrigerant leakage at piping connections.
(d) Cabinet
• Stain and Lubricant - Inspect for any stain or lubricant and remove it, if any.
• Securing Screw - Inspect for loose or missing screws and secure or replace as required.
• Insulation - Inspect for peeling thermal insulation material on the cabinet and repair it, if any.
(e) Electrical Equipment
• Activation - Inspect for abnormal activation of the magnetic contactor, auxiliary relay, or printed
circuit board (PCB).
• 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.
(2) For Water Source Unit Only
(a) Compressor
•
Sound and Vibration - Inspect for abnormal sounds or vibration.
•
Activation - Check that the voltage drop of the 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
•
Clogging - Check that there is no temperature difference between the ends.
(d) Ground Wiring
•
Ground Line - Inspect for continuity to the earth ground.
(e) Crankcase Heater
•
Activation - Apply power to the water source unit(s) at least 12 hours prior to operation of the
system for preheating of the compressor oil.
(3) For Indoor Unit Only
(a) Air Filter
•
Cleaning - Inspect for, and remove, any accumulated dirt and dust and remove according to the
“Engineering Manual”.
(b) Condensate Pan, Condensate Mechanism and Condensate Pipe
•
Drain Line - Inspect and clean the condensate 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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