Daikin VRV W T-series - Setting the Cool; Heat Changeover Master

4 Preparation
Installation manual
15
RWEQ96~432TAYCU
VRV W T-Series water-cooled system air conditioner
4P540122-1B – 2018.11
4.3.7 Piping length requirements
In case of heat pump mode
10
12 13
11 17
16
987
1
Y
14 15
6
b
a
a
b
c
*b *b
b
b b
First branch
Furthest
branch
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)
please size up both liquid pipe and gas pipe until the closest branch.
(14, 16)
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
987
1
Y
14
6
d d
d
B3
c
B4 dB6
*b
*b
b
b
b b
a
a
18 19
15
B5
c
*b b
First branch
Furthest
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 ○