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If the required pipe size is not available, you can use
other diameters by considering the following factors:
▪
If the standard size is not available in local
market, a pipe that is one size larger should be
used.
▪ In some circumstances, the pipe size needs to
be one size larger than the standard size; this is
the "Size up Size" (for example: when the
equivalent length of all the liquid piping is larger
than 90m, the pipe size needs to be one size up;
when the piping length from the farthest indoor
unit to the first indoor unit is more than 40m, the
indoor main pipe size needs to be one size up to
allow a piping length of up to 120m). If the "Size
up Size" is not available in the local market, the
standard size pipe must be used.
▪
Pipe sizes bigger than the corresponding "Size up
Size" cannot be used under any circumstances.
▪ Calculation for the additional refrigerant must be
adjusted according to section 5.9 on the
determination of the additional refrigerant volume.
3) Select the branch joint diameters for the
outdoor unit
Select the branch joint of the outdoor unit from the table
below.
For JR8V combinable series
Table 4.10
Outdoor
Illustration
unit Qty.
2 units
g2
g1
3 units
g3
g2
NOTE
For systems with multiple units, the branch joints
of the outdoor unit are sold separately.
Main pipe
L
g1
Main pipe
L
M
G1
23
For JR8V combinable series
Table 4.11
Total parallel
Outdoor
Outdoor connection
capacity of
unit Qty.
pipes diameter
outdoor units
g1, g2:
252~335: Φ25.4/Φ12.7;
56HP
400~670: Φ31.8/Φ15.9;
785~900: Φ38.1/Φ19.1;
2 units
g1, g2
≥56HP
560~670: Φ31.8/Φ15.9;
785~900: Φ38.1/Φ19.1;
g1, g2, g3
252~335 Φ25.4/Φ12.7
400~670 Φ31.8/Φ15.9
≤96HP
3 units
785~900 Φ38.1/Φ19.1
G1 Φ41.3/Φ22.2
4) Indoor unit auxiliary connection pipe
Table 4.12
Indoor unit capacity
Gas side
(mm)
A (×100W)
A≤56
Φ12.7
56<A≤160
Φ15.9
CAUTION
If the indoor unit capacity exceeds the range
in the table above, select the pipe diameter
according to the manual of the indoor unit.
The size of the indoor branch pipe shall not
be larger than that of the main pipe. If the size
of the main pipe selected according to the
above table is larger than that of the main
pipe, the size of the branch pipe shall be
reduced to make it the same as that of the
main pipe.
5) An example of refrigerant piping selection
The example below illustrates the piping selection
procedure for a system consisting of two outdoor
units (900+560)
and
11
system's
equivalent length of all liquid pipes is less
than 90m; the piping between the farthest indoor
unit and the first indoor branch joint is less than 40m
in length, and each indoor auxiliary pipe (from each
indoor unit to its nearest branch joint) is less than 10m
in length.
Branch
joint kit
L:
EVRO-BP2
L:
EVRO-BP2G
L+M:
EVRO-BP3
Liquid side
(mm)
Φ6.35
Φ9.52
indoor
units.
The
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