Maintenance
Technical Catalogue
TCGB0051 rev 0 - 09/2009
68
Components
The unit should be periodically inspected according to the same items as those described in
the paragraph titled
“Test Running“. In order to ensure dependable performance and long life operation, the
following additional items should be given for particular attention.
11.1. Components
¡ Compressor
The semi-hermetic screw compressor requires periodic maintenance, including
replacement of parts. See the HITACHI Service Handbook for Screw Compressors, for
details.
¡ Electrical Equipment
Always pay careful attention to working voltage, amperage and phase balance. Check for
faulty contact caused by loosened terminal connections, oxidised contacts, foreign matter,
and others.
¡ Control and Protective Devices
Do not readjust the settings in the eld unless the setting is maintained at the point other
than the point listed in the table on chapter 8..
11.2. Lubrication
¡ Compressor
The compressors are charged at the factory with the correct oil listed in “Component
Data” and the compressor nameplate. It is not necessary to add oil, if the refrigerant cycle
remains sealed.
11.3. Deposits
Lime and other minerals in the condenser water or chilled water tend to deposit on
inside surfaces of plates over a long period of operation. As deposits of these minerals
increase, excessive high discharge pressure or lower operation pressure are detected,
indicating evidence of deposits on the condenser or the water cooler. The gure in page
31 indicates the range where cleaning is required.
(Condenser: In the case of water-cooled type)
CAUTION:
- Cleaning of plate type heat exchangers shall be performed by specialists. Please contact your
contractor or dealer of HITACHI.
- Clean the water strainer lter periodically according to its clogging degree. If not cleaned
periodically, the water strainer will be broken due to an excessive pressure to the strainer
screen.
WARNING:
- This product is equipped with plate type heat exchangers. In the plate type heat exchanger,
water ows through a narrow space between plates. Therefore, there is a possibility that freezing
may occur if foreign particles or dusts are clogged. In order to avoid this clogging, provide a
20 mesh water strainer at the inlef of the chilled water piping near the product. If clogging in
the plate type heat exchanger occurs seriously, this will cause insufcient cooling performance
or local freezing in the plate type heat exchanger. It is strongly recommended that the heat
exchanger be cleaned at the same time when the lter is cleaned.
- Pay attention to the following caution and normal cleaning method. For details, contact your
Hitachi installer.
WARNING:
If a re accidentally
occurs, turn OFF the
main switch and use an
extinguisher for an oil
re and an electric re.
Do not operate the unit
near ammable gases
such lacquer, paint oil,
etc. to avoid a re or an
explosion.
Turn OFF the main
switch when electrical
box covers are
removed for setting the
temperature. Do not
operate the unit without
xing panels.
DANGER:
Switch OFF main
interruptor (M.I.) for any
work inside electrical
box.
CAUTION:
Perform periodical
maintenance
according to the
“INSTRUCTIONS“ to
maintain the unit in a
good condition.
Do not touch the parts
at the discharge gas
side by hand, since the
pipes at the discharge
side are heated by
refrigerant and the
temperature becomes
higher than 100 °C.
Do not utilize this unit
for cooling or heating of
drinking water or food.
Comply with local codes
and regulations.
Turn OFF all the main
switches if refrigerant
leakage or chilled / hot
water leakage occurs.
Also, if the unit can
not be stopped by the
control switch, turn
OFF all the switches for
power source.
Refrigerant
Water
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