HRX-OM-J022
6 Unit Maintenance
HRG001-W HRG002-W HRG005-W
6.1 Control of water quality
1
st
edition :Jul. 2005
6-1
6. Unit Maintenance
6.1 Control of water quality
Table 6-1 Water quality standards for fresh water (tap water)
Substances
Cooling water system/ Circulating
fluid
pH (25°C)
6.8 to 8.0
Electrical conductivity (25°C) (µs/cm)
1 to 400
Chloride ion (mgCl-/L)
50 and below
Sulfuric acid ion (mgSO
4
2-
/L)
50 and below
Acid consumption (pH4.8) (mgCaCO
3
/L)
50 and below
Total hardness (mgCaCO
3
/L)
70 and below
Calcium hardness (mgCaCO
3
/L)
50 and below
Standard
Ion silica (mgSiO
2
/L)
30 and below
Iron (mgFe/L)
1.0 and below
Copper (mgCu/L)
1.0 and below
Sulfide ion (mgS
2-
/L)
Don’t be detected
Ammonium ion (mgNH
4
+
/L)
1.0 and below
Residual chlorine (mgCl/L)
0.3 and below
Reference
Free carbon dioxide (mgCO
2
/L)
4.0 and below
*Excerpt from the Refrigeration and Air Conditioning Equipment Water Quality
Guideline JRA-GL-02-1994
circulating fluid used in this unit is fresh water (tap water). This unit
may be damaged when unpermitted fluids are used. Potential fluid leak
may occur if disregarded, which results in electric shock and ground
fault.
ONLY use fresh water (tap water) which satisfies water quality
standards as shown in the table below.
If the periodic inspection finds a nonconforming substance in the
facility water, wash the tank and the cirulating circuit, and replace the
water in the tank. Water will evaporate, and impurities will build up.
Even if no abnormal event occurs, it is recommended to replace the
water in the tank once every three months. Refer to section "6.2
Inspection and Cleaning" for the periodic inspection.
