Panasonic WH-MXC09J3E8 Service Manual page 143

16.1.4 Specifications
16.1.4.1 Specifications of Fresh Water was Heat Transfer Medium in Brazed Heat
Exchanger
Parameter Quality Limits for Tap Water on the Secondary Side
Temperature Below 60°C
pH 7 to 9
Alkalinity 60mg/I <HCO
Conductivity < 500μS/cm
Hardness [Ca
Chloride < 200mg/l at 60°C
Sulphate [SO
Nitrate NO
Chlorine < 0.5mg/l
16.1.4.2 External Filter
Solids in the water must be filtered.
Minimum filter mesh size required for the field supply external filter in the water inlet is 20 mesh.
<300mg/I
3
+ , Mg + ] / [HCO - ] > 5
3
2-
] > 100mg/I and [HCO
4
< 100mg/I
3
- 2-
] / [SO ] > 1
3 4
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