SYSVRF2 IM

18
5.4 Branch joints installation
5.2.5 Indoor auxiliary pipes selection (a to q)
Unit: mm
g1, g2:
8~12HP: Φ25.4/Φ12.7;
14~22HP: Φ31.8/Φ15.9
24-32HP:38.1/19.1
R:
FQZHW-02N1E
R+S:
FQZHW-03N1E
g1, g2,g3:
8~12HP: Φ25.4/Φ12.7;
14~22HP: Φ31.8/Φ15.9;
24-32HP:38.1/19.1
G1: Φ41.3/Φ22.2
5.3 Refrigerant piping selection example
Liquid side
(mm)
Gas side
(mm)
Liquid side
(mm)
Gas side
(mm)
Indoor unit
capacity
A(×100W)
A≤45
A≥56
Φ12.7 Φ6.4
Φ15.9 Φ9.5 Φ19.1
Φ12.7
Φ15.9 Φ9.5
Table.5-8
Table.5-7 Outdoor connection pipes and branch joints selection
Outdoor
unit Qty.
2 units
3 units
Outdoor connection
pipes diameter
outdoor branch
joint kits
Note: For systems with two or more outdoor units, outdoor branch
joints (sold separately) are required.
The example below illustrates the piping selection procedure for a
system consisting of three outdoor units (32HP + 22HP + 12HP) and
17 indoor units. The system's equivalent total liquid piping length
is in excess of 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, refert to Fig. 5-3.
Select indoor auxiliary pipes
Refer to Table 5-8 to select indoor auxiliary pipes (a-q)
Select indoor main pipes and indoor branch joints B to P
The indoor units (N3 and N4) downstream of indoor branch joint E
h ave total capacity of 14 + 7.1 = 21.1kW. Refer to Table 5-3.
Indoor main pipe L5 is Φ19.1 / Φ9.5. Indoor branch joint E is
FQZHN-01D.
The indoor units (N1 to N8) downstream of indoor branch joint B
have total capacity of 14 x 5 + 11.2 + 7.1 + 2.8 = 91.1kW. Refer to
Table 5-3. Indoor main pipe L2 is Φ31.8 / Φ19.1. Indoor branch
joint B is FQZHN-03D.
The other indoor main pipes and indoor branch joints are selected
in the same fashion.
Select main pipe and indoor branch joint A
The indoor units (N1 to N17) downstream of indoor branch joint A
have total
capacity of 14 x 9 + 11.2 x 2 + 7.1 x 2 + 5.6 x 2 + 2.8 x
2 = 179.4kW.
The system's equivalent total piping length is in
excess of 90m. The total capacity of the outdoor units is 32 + 22 +
12 = 66HP. Refer to Tables 5-3 and 5-5. Main pipe L1 is the larger
of Φ41.3 / Φ19.1 and Φ44.5 / Φ22.2, hence Φ44.5 / Φ22.2. Indoor
branch joint A is FQZHN-05D.
Select outdoor connection pipes and outdoor branch joints
The master unit is 32HP and the slave units are 22HP and 12HP.
Refer to Table 5-7. Outdoor connection pipes g1 isΦ25.4 / Φ12.7,
g2 is Φ31.8 / Φ15.9 and g3 is Φ38.1 / Φ19.1. Outdoor connection
pipe G1 is Φ41.3 / Φ22.2.
There are three outdoor units in the system. Refer to Table 5-7.
Outdoor branch joints L and M are FQZHW-03N1E.
Indoor branch joints may be installed either horizontally or vertically.
Horizontal branch joints must be installed at an angle to the
horizontal not exceeding 10° in order to avoid uneven distribution of
refrigerant and possible malfunction. Refer to Figure 5-4.
When branch joint’s
length ≤ 10m
When the branch’s
joint’s is length＞10 m
10°
10°
A
Fig.5-4
CorrectIncorrect
U-shaped branch joint
Horizontal surface
Directional view
To avoid accumulation of oil in the outdoor units, outdoor branch
joints should be installed horizontally and must not be higher than the
outdoor unit refrigerant outlets. Refer to Figure 5-5 to 5-8.
Fig.5-5
Fig.5-6