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HRX-OM-J049-A
Chapter 6 Unit Maintenance
HRG010-W HRG015-W 6.1 Control of Water Quality
1st edition : Aug. 2006
Rev. A: May. 2007
6-1
Chapter 6 Unit Maintenance
6.1 Control of Water Quality
Table 6-1 Water quality standards for fresh water (tap water)
Substances
Facility water
spec.
Circulating fluid spec.
pH (25°C) 6.5 to 8.2 6.0 to 8.0
Electrical conductivity (25°C) (µs/cm) 100
(*1)
to 800 100
(*1)
to 300
(*2)
Chloride ion (mgCl-/L) 200 and below 50 and below
Sulfuric acid ion (mgSO
4
2-
/L) 200 and below 50 and below
Acid consumption (pH4.8) (mgCaCO
3
/L) 100 and below 50 and below
Total hardness (mgCaCO
3
/L) 200 and below 70 and below
Calcium hardness (mgCaCO
3
/L) 150 and below 50 and below
Ion silica (mgSiO
2
/L) 50 and below 30 and below
Iron (mgFe/L) 1.0 and below 0.3 and below
Copper (mgCu/L) 0.3 and below 1.0 and below
Sulfide ion (mgS
2-
/L) Not detected
Ammonium ion (mgNH
4
+
/L) 1.0 and below 0.1 and below
Residual chlorine (mgCl/L) 0.3 and below 0.3 and below
Free carbon dioxide (mgCO
2
/L) 4.0 and below 4.0 and below
Standard
Filtering (μm) 5 and below
* Refrigeration and Air Conditioning Equipment Water Quality
Guideline JRA-GL-02-1994
(*1) Electrical conductivity: Min. 100[μS/cm]
(*2) 0.003 to 0.01 if the unit of M[Ω•cm] is used.
The 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.