Hitachi YUTAKI M R32 RASM-4VR1E Manual De Instrucciones página 24

REFRIGERANT AND WATER PIPING
• Insulate the unions and flare-nuts at the piping connection part
completely.
• Insulate the liquid piping completely to avoid a decrease of
performance; if not, it will cause sweating on the surface of the
pipe.
• Charge refrigerant correctly. Overcharging or insufficient
charging could cause a compressor failure.
7.3 Water Control
It is necessary to analyse the quality of water by checking pH, electrical conductivity, ammonia ion content, sulphur
content, and others. The following is the recommended standard water quality.
Standard Quality pH (25 °C)
Electrical Conductivity (mS/m) (25 °C)
{µS/cm} (25 °C)
(2)
Chlorine Ion (mg CI¯/I)
Sulphur Acid Ion (mg SO
The Amount of Acid Consumption (pH 4.8)
(mg CaCO /I)
3
Total Hardness (mg CaCO
Calcium Hardness (mg CaCO
Silica L (mg SIO /I)
2
Reference Quality Total Iron (mg Fe/I)
Total Copper (mg Cu/I)
Sulphur Ion (mg S
Ammonium Ion (mg NH
Remaining Chlorine (mg CI/I)
Floating Carbonic Acid (mg CO
Index of Stability

NOTE
• (1) The mark " " in the table means the factor concerned with the tendency of corrosion or deposits of scales.
• (2) The value showed in "
EN
PMML0578 rev.0 - 04/2022
Item
¯/I)
2
4
/I)
3
/I)
3
¯/I)
2
/I)
+
4
/I)
2
{}
" are for reference only according to the former unit.
• Check for refrigerant leakage in detail. If a large refrigerant
leakage occurred, it would cause difficulty with breathing or
harmful gases would occur if a fire were being used in the room.
• If the flare nut is tightened too hard, the flare nut may crack after
a long time and cause refrigerant leakage.
Chilled Water System
Circulating Water
Supply Water
(20 C Less than)
6.8 ~ 8.0
Less than 40 Less than 30
Less than 400 Less than 300
Less than 50 Less than 50
Less than 50 Less than 50
Less than 50 Less than 50
Less than 70 Less than 70
Less than 50 Less than 50
Less than 30 Less than 30
Less than 1.0 Less than 0.3
Less than 1.0 Less than 0.1
It shall not be detected.
Less than 1.0 Less than 0.1
Less than 0.3 Less than 0.3
Less than 4.0 Less than 4.0
6.8 ~ 8.0
Tendency
Corrosion
6.8 ~ 8.0
-
(1)
Deposits
of Scales
8