Hitachi FSG Series, Технический каталог

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19
/2
MAINTENANCE
19.1 REGULAR INSPECTION
The unit should be periodically inspected according to the
same items as those described in the chapter “16. TEST
RUN”.
In order to ensure dependable operation and long life, the
following additional items should be given as particular
attention.
19.1.1 FOR INDOOR UNIT AND OUTDOOR UNIT
n
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.
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Heat Exchanger
- Clogging – Inspect 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
flow, should also be removed.
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Piping Connection
- Leakage – Inspect for refrigerant leakage at piping
connections.
n
Cabinet
- Stain and Lubrication – Inspect and remove any stain
or lubrication.
- Fixing Screw – Inspect and fix loosened or lost
screws.
- Insulation – Inspect and repair peeled thermal
insulation material on cabinet.
n
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.
n
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 “ SAFETY AND CONTROL DEVICE
SETTING”.
19.1.2 FOR INDOOR UNIT
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Air Filter
- Cleaning – Inspect and remove any accumulated dirt
or dust according to “19.2 Filter Cleaning”.
n
Drain Pan, Drain-Up Mechanism and Drain Pipe
- Drain Line – Inspect and clean the condensate drain
line least twice a year.
- Drain-Up Mechanism – Inspect for activation of drain-
up mechanism.
n
Float Switch
- Activation – Inspect for activation of float switch.
19.1.3 FOR OUTDOOR UNIT
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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.
n
Reverse Valve
- Activation – Inspect for any abnormal activation sound.
n
Strainer
- Clogging – Inspect for that no temperature difference
between both ends.
n
Earth Wire
- Earth Line – Inspect for continuity to the earth.
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Oil Heater
- Activation – The oil heater should be activated at least
12 hours before start-up, by switching ON the main
power source.
19.1.4 FOR REMOTE CONTROL SWITCH
- Switch and Indication – Inspect for activation of switch.