4 Preparation
Installation manual
16
RWEQ96~432TAYD
∗
+ RWEQ96~432TATJ
∗
VRV W T-Series water-cooled system air conditioner
If the actual pipe length difference after the first branch is more than
130 ft (40 m), please size up the piping until the last branch. (
Liquid
pipe and gas pipe at Heat pump mode) (7, 8, 9).
The total piping length:
1+(7+8+9+14+16
)×2+
6+10+11+12+13+15+17
)≤980 ft (300 m)
If size exceeds the main pipe size due to size increase, please also
size up main pipe according to "4.3.2 To select the piping size" on
page 11.
In case of heat recovery mode
B1
B2
10
12
13
11
17
16
9
8
7
1
Y
14
6
d
d
d
B3 c
B4
d
B6
*b
*b
b
b
b
b
a
a
18
19
15
B5 c
*b
b
First branch
Farthest
branch
B1-B6
Branch selector unit
If actual piping length of indoor units 48 types, 54 types, and 72
types, 96 type where difference from the indoor unit (Y) nearest to
the outside unit is more than 130 ft (40 m),
Example:
b is neither 48 types nor 54 types nor 72 types nor 96 type
*b is 48 types or 54 types or 72 types or 96 type
(6+11)–(6+10)<130 ft (40 m)
(7+12+17)–(6+10)<130 ft (40 m)
(7+13+17)–(6+10)<130 ft (40 m)
(7+8+14)–(6+10)>130 ft (40 m)
(7+8+9+15)–(6+10)>130 ft (40 m)
(7+8+9+16)–(6+10)>130 ft (40 m)
(7+8+9+15+18)–(6+10)>130 ft (40 m)
(7+8+9+15+19)–(6+10)>130 ft (40 m)
please size up both liquid pipe and gas pipe until the closest branch.
(14, 16, 18)
If the actual pipe length difference after the first branch is more than
130 ft (40 m), please size up the piping until the last branch. (
Liquid
pipe only at Heat Recovery mode) (7, 8, 9).
The total piping length:
1+(7+8+9+14+16+18
)×2+
6+10+11+12+13+15+17+19
)≤980 ft (300 m)
If size exceeds the main pipe size due to size increase, please also
size up main pipe according to "4.3.2 To select the piping size" on
page 11.
4 .4
Preparing water piping
4 .4 .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
(68~140°F)
(20~60°C)
Make-up
water
Corrosion
Scale
Standard items
pH (77°F (25°C))
6.5~8.2
6.0~8.0
7.0~8.0
○
○
Electrical conductivity (mS/ft (mS/m)) (77°F
(25°C))
<24.4 (80)
<9.1 (30)
<9.1 (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)
<150
<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 (104°F 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.
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2020/07/29 16:16:41
