HRX-OM-L014
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HRGC001-A HRGC002-A HRGC005-A
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1
st
edition : Jun. 2007
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-1
Chapter 7 Control, Inspection and
Cleaning
7.1 Control of Recirculating Fluid Quality
Table 7-1 Quality standard for fresh water (tap water)
Standard value
Item
Unit
For recirculating
fluid
For facility water
pH (at 25
o
C)
-
6.0~8.0
6.5~8.2
Electric conductance (at
25
o
C)
[µS/cm]
100~300
100~800
Chloride ion
[mg/L]
50 or less
200 or less
Sulfuric acid ion
[mg/L]
50 or less
200 or less
Acid consumption (at pH
4.8)
[mg/L]
50 or less
100 or less
Total hardness
[mg/L]
70 or less
200 or less
calcium hardness
[mg/L]
50 or less
150 or less
Standard
item
Ion silica
[mg/L]
30 or less
50 or less
Iron
[mg/L]
0.3 or less
1.0 or less
Copper
[mg/L]
0.1 or less
0.3 or less
Sulfide ion
[mg/L]
Not detected
Not detected
Ammonium ion
[mg/L]
0.1 or less
1.0 or less
Residual chlorine
[mg/L]
0.3 or less
0.3 or less
Referential
item
Separation carbonic acid
[mg/L]
4.0 or less
4.0 or less
*Quoted from JRA-GL-02-1994, The Japan Refrigeration and Air Conditioning Industry Association.
B
Use specified recirculating fluids only. If Other fluids are used, they
may damage the unit or result in dangerous hazards.
When using fresh water (tap water) ensure that it satisfies the water
standard shown in the table below.
Clean the tank, recirculating fluid circuit, and change the recirculating
fulid in the tank if any problems are seen in the regular check.
Additionally, even if no problems are found, it is necessary to change
the fluid once every 3 months considering evaporated fluid and
concentrated. Refer to the page containing "7.2 Inspection and
Cleaning" for the regular check.