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IDX-OM-Y002
Chapter 5
Checks
, Maintenance and Adjustment
IDF60/70/80/90 Series
5.2
Regular maintenance
5-3
2
)
Water quality check (monthly)
When tap water (well
)
or ground water is used as cooling water for water-cooled condenser, test
the water quality based on
(
Testing Methods for industrial Water) or methods compliant with
JISK0101 for items in Table -1.
When the value is outside of the standard value, take actions below.
a) Change the source of water supply. For example, change the well water to tap water.
b) Ask water treatment consultant about appropriate method.
c) Change the cooling method. Change once-through water cooling method to
circulated-water cooling.
When cooling water passing through the cooling towers, initially it may satisfy with water quality
standards. However, in places where contaminated air is present, sulfite gas in the air may
dissolve into the facility water and become sulfuric acid, corroding the heating surface. Inspect
the quality of the cooling water and replace the circulating water on a regular basis.
Fig. 1 shows the possible issues due to water quality
9
8
Within criteria
7
6
5
4
2
3
4 5
10
3
2
3
4 5
10
4
×10
2
×10
2
×10
2
×10
2
×10
2
×10
2
×10
2
×10
2
Electric conductivity
(
μS/cm
)
Fig. 1 Relation between pH conductivity and trouble
(3) Maintenance and inspection of the strainer (monthly)
CAUTION
If the mesh of the Y shaped air strainer becomes clogged with foreign matter such as algae,
heat radiation performance declines. This will start the safety device and stop operation.
WARNING
Stop the cooling water system or stop the cooling water circuit to release the residual
pressure.
p
H (
25
o
C)
10
2
Trouble due to
corrosion is likely to
occur
Trouble due to scale is
likely to occur