LG KCHH Series Installation Manual page 138

WATER SYSTEM MAINTENANCE
3
After cleaning work is completed, operate the product to see if it works properly once again.
Gate valve (locked)
Drain valve (locked)
Daily inspection management
1
Water quality management
Plate type heat exchanger does not have the structure for disassembly, cleaning, or parts replacement.
To prevent corrosion or scale accumulation in the plate type heat exchanger, you have to take a special
caution for water quality management. Water quality shall satisfy the minimum suggested water quali-
ty category standard. If corrosion prevention solution or corrosion restraining solution is added, you
have to use ingredients with no corrosive property against stainless and copper. To prevent the con-
tamination of the circulation water by external air, it is recommended to periodically drain the water
inside the water pipe and fill water again even if the circulation water is not contaminated.
2
Flow amount management
If the flow amount is insufficient, freeze and burst may occur in the plate type heat exchanger.
Check if strainer is blocked or filled with air, and check whether flow amount is insufficient by check-
ing the difference of temperature or pressure between the outdoor unit inlet and outlet water pipe. If
there is a difference of temperature or pressure above appropriate level, it shows that the flow amount
is decreased, so immediately stop the operation and remove the cause before the re-operation. (* If
there is an air, make sure to perform purge work. The air inside water pipe hinders the heat source
water circulation to cause flow amount insufficiency, and it may also cause freeze and burst.)
3
Brine concentration management
If Brine(antifreeze) is used in the heat source water, use the designated type and concentration.
Calcium chloride Brine causes corrosion of the plate type heat exchanger, so it may not be used.
If the antifreeze is left alone, it absorbs moisture from the air and the concentration will decrease and
may lead to freeze and burst of the plate type heat exchanger, so minimize the contact area with air
and periodically measure the concentration of Brine, and maintain the concentration of Brine by adding
Brine as necessary.
138
Service plug
Strainer
[Plate type heat exchanger cleaning]
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Gate valve (locked)
Chiller
Pump
Hose
Filtering
net