Hitachi RCUE40AG2 Service Manual page 158

Maintenance
Other maintenance item

To maintain good water quality, it is necessary to consider the installation place. See the below for your
reference.
Before installation
−
Maintenance item
1. Installation place
a). Study if installation place is suitable.
(*). Abnormal wastewater from boiler or refrigerating
machine is not mixed with the chilled water.
2. System
a). Study if materials of heat exchanger, pipe, tank, valve
etc are suitable.
b). Prohibition of open the pipe connected with tank to
ambient air.
c). Study of temperature, fl ow, pressure and minimum
holding water volume of chilled and heating water.
3. Water for use
a). Study of specifi cation in case of brine.
b). Study of specifi cation in case of special water like pure
water.
After working
−
Maintenance item
1. Confi rm if there is no leakage in pump, valve, pipe etc.
2. Study of temperature, fl ow, pressure and minimum
holding water volume of chilled and heating water
pag. 156
SMGB0003 rev.0 - 11/2006
Measures
Analysis of water quality should be asked to a specialised
−
company in water treatment. If it is a negative result,
water source should be changed or treatment system
should be changed after consulting with the company.
Corrosion may concentrate to only one part due to the
−
difference of material in chilled and heating water system.
Open the pipe to ambient air may promote the corrosion.
−
Pipe should be put inside the water.
Control that these values be within the usage range.
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Suitable brine for Hitachi's product should be selected. Its
−
specifi cation is accorded with Hitachi technical handbook
"caution in use of brine".
There is a case that special water like pure water may not
−
use in standard Chiller unit. Especially, in case of pure
water, material should be made in SUS or certain water
treatment should be performed.
Measures
Suitable measurement should be taken in case of
−
the leakage
Control that these values be within the usage
−
range. (once a day)