HRX-OM-I051
Chapter 7 System Maintenance
HRZ Series
7.1 Water Quality Management
7-1
Chapter 7 System Maintenance
7.1 Water Quality Management
Table 7-1 Water Quality Standards for Fresh Water (Tap Water)
Substance
Facility water
spec.
Circulating water
spec.
Standards
pH (25°C)
6.5 to 8.2
6.0 to 8.0
Electrical conductivity (25°C) (µs/cm)
*Circulating fluid 1 to 500
100 to 800
0.5 to 300
Chloride ion (mgCl-/L)
Max. 200
Max.50
Sulfate ion (mgSO
4
2-
/L)
Max.200
Max.50
Acid consumption (pH4.8)
(mgCaCO
3
/L)
Max.100
Max.50
Total hardness (mgCaCO
3
/L)
Max.200
Max.70
Calcium hardness (mgCaCO
3
/L)
Max.150
Max.50
Ionic silica (mgSiO
2
/L)
Max.50
Max.30
Iron (mgFe/L)
Max.1.0
Max.0.3
Copper (mgCu/L)
Max.0.3
Max.0.1
Sulfide ion (mgS
2-
/L)
Not be detected
Ammonium ion (mgNH
4
+
/L)
Max.1.0
Max.0.1
Residual chlorine (mgCl/L)
Max.0.3
Max.0.3
Free carbon dioxide (mgCO
2
/L)
Max.4.0
Max.4.0
Filtering (µm)
Max.5
* According to the Water quality guideline for refrigeration air-conditioning equipment: JRA-GL-02-1994
Only designated circulating fluid is permitted to use for this system.
Potential system failure and fluid leak may occur if disregarded, which
results in electric shock, ground fault, and freeze.
Be sure to use fresh water (tap water) compliant with water quality
standards in the table below for ethylene glycol aqueous solution and
facility water.
If the periodic inspection finds a nonconforming substance in the
facility water, clean the facility water circuit and recheck the quality of
the facility water.
