Daikin VRV IV W+ Series, Инструкция для установки и пользователя

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18 | Piping installation
Installer and user reference guide
78
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
18.2 Preparing water piping
18.2.1 Water quality requirements
Cooling water
(b)
and
circulation system
Hot water system
(c)
Tendency
(d)
Item
(a)
Circulation
water
Make-up
water
Circulation
water
Make-up
water
Corrosion Scale
Standard items
pH (25°C) 6.5~8.2 6.0~8.0 7.0~8.0 ○ ○
Electrical conductivity (mS/m) (25°C) <80 <30 <30 ○ ○
Chloride ions (mg Cl
–
/l) <200 <50 <50 ○
Sulfate ions (mg SO
4
2–
/l) <200 <50 <50 ○
Acid consumption (pH 4.8) (mg
CaCO
3
/l)
<100 <50 <50 ○
Total hardness (mg CaCO
3
/l) <200 <70 <70 ○
Calcium hardness (mg CaCO
3
/l) <50 <50 ○
Ionic-state silica (mg SiO
2
/l) <50 <30 <30 ○
Reference items
Iron (mg Fe/l) <1.0 <0.3 <1.0 <0.3 ○ ○
Copper (mg Cu/l) <0.3 <0.1 <1.0 <0.1 ○
Sulfate ion (mg S
2–
/l) — ○
Ammonium ion (mg NH
4
+
/l) <1.0 <0.1 <0.3 <0.1 ○
Residual chlorine (mg Cl/l) <0.3 <0.25 <0.3 ○
Free carbon dioxide (mg CO
2
/l) <4.0 <0.4 <4.0 ○
Stability index 6.0~7.0 — — ○ ○
(a) These items represent typical causes of corrosion and scale.
(b) In a condenser water circuit that uses a closed cooling tower, the closed circuit circulating water and make-up water MUST
meet the water quality standards for the hot water system, and passing water and make-up water MUST satisfy those for
the circulation type cooling water system.
(c) Corrosion has a tendency to occur when water temperature is high (40°C or higher), and if metals with no protective
coating are directly exposed to water, it would be a good idea to take effective measures against corrosion such as adding
a corrosion inhibitor or deaeration treatment.
(d) The circle marks in the columns indicate a tendency for corrosion or scale to develop.
NOTICE
▪
The supply water MUST be clean tap water, industrial water or clean
underground water. Do NOT use purified or softened water.
▪
Do NOT use once-through water. It may cause corrosion.
18.2.2 Water circuit requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions" [ 4 8].