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Idiomas disponibles
Idiomas disponibles
◆ Allowable length and allowable height difference of refrigerant pipe
Item
Single outdoor unit
system
Total extension of pipe
(liquid pipe, real length)
Multiple outdoor unit
system
Equivalent length
Furthest pipe length
L (*1)
Real length
Equivalent length
Max. equivalent length of
Main pipe L1
Real length
Pipe
length
Equivalent length of furthest pipe
from 1st branching Li
Equivalent length of furthest pipe between
outdoor units LO
Equivalent length of outdoor unit connecting pipe
Max. real length of indoor unit connecting pipe
Max. equivalent length between branches
Upper
outdoor
unit
Height difference
between outdoor and
indoor unit H1
Difference
Lower
in height
outdoor
unit
Upper outdoor unit
Height difference
between indoor units H2
Lower outdoor unit
Height difference between outdoor units H3
(*1) : (C) is outdoor unit furthest from the 1st branch and (j) is the indoor unit furthest from the 1st branch.
(*2) : Total charging refrigerant is 308.6 lbs (140 kg) or less.
(*3) : Extension up till 361 ft (110 m) is possible with conditions below :
- Single outdoor unit system
- Connected ratio of indoor units to outdoor units is below 105%
- Liquid side has been increased 1 size from standard size
(*4) : Extension up till 361 ft (110 m) is possible with conditions below :
- Multiple outdoor unit system
- Connected ratio of indoor units to outdoor units is below 105%
- Minimum capacity of connecting indoor units is more than 27 of capacity code
(*5) : If the connected ratio of indoor units to outdoor units is more than 105%, set 49 ft (15 m) or less.
(*6) : When the main pipe is shorter than 132 ft (40 m), please contact manufacturer's representative
for review.
27-EN
Allowable Length
Pipe section
ft
m
1640
500
LA + La + Lb + Lc + L1 + L2 +
L3 + L4 + L5 + L6 + L7 + a +
b + c + d + e + f + g + h + I + j
3937 (*2)
1200 (*2)
771
235
LA + Lc + L1 + L3 + L4 + L5
+ L6 + j
623
190
394 (*6)
120 (*6)
L1
328 (*6)
100 (*6)
H1 > 9.8 ft
213
65
(3 m)
L3 + L4 + L5 + L6 + j
H1 ≦ 9.8 ft
295
90
(3 m)
82
25
LA + Lb, LA + Lc
33
10
La, Lb, Lc
98
30
a, b, c, d, e, f, g, h, I, j
164
50
L2, L3, L4, L5, L6, L7
H2 > 9.8 ft
164
50
–
(3 m)
H2 ≦ 9.8 ft
230
70
–
(3 m)
361 (*3)
110 (*3)
H2 > 9.8 ft
98
30
–
(3 m)
H2 ≦ 9.8 ft
131
40
–
(3 m)
361 (*4)
110 (*4)
131 (*5)
40 (*5)
–
16
5
–
Airtightness test
After the refrigerant piping has been finished, execute an airtight test.
For an airtight test, connect a nitrogen gas canister as shown in the figure on this page and apply pressure.
Be sure to apply pressure from the service ports of the packed valves (or ball valves) at the liquid side and gas
side.
An airtight test can only be performed at the service ports at the liquid side and gas side on header unit.
Close the valves fully at the gas side and liquid side. As there is a possibility that the nitrogen gas will enter into
the cycle of outdoor units, re-tighten the valve rods at the liquid side before applying pressure.
For each refrigerant line, apply pressure gradually in steps at the liquid side and gas side.
Be sure to apply pressure at the gas side and liquid side.
WARNING
Never use oxygen, flammable gases, or noxious gases in an airtight test.
Main piping
Valve details
To gauge
manifold
To outdoor unit
Liquid-side
Gas-side valve
Liquid-side
valve
service port
To
outdoor
unit
Gas-side
Piping at site
service port
Piping at site
Connected to other follower units
– 14 –
Low pressure
gauge
Connected to indoor unit
Gas side valve fully closed
V
L
Header outdoor unit
Service port
Brazed
Copper pipe
Brazed
Copper
Service port
pipe
Liquid valve fully closed
High pressure
gauge
Gauge
V
H
manifold
Reducing
valve
Nitrogen
gas
EN
EN
ID
28-EN
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