Table 4-2. Main pipe (L1) and first branch joint (A)
Outdoor Unit
Capacity (HP)
Pipe Diameter (mm OD)
Liquid
pipe
Low Pressure
Gas Pipe
High Pressure
Gas Pipe
Branch joint kit
Table 4-3. Outdoor unit connection pipes (g1 to g3, G1 )
Outdoor unit
Capacity (HP)
Liquid
pipe
Low Pressure
Gas Pipe
Table 4-4. Outdoor unit branch joint kits (L, M)
8
10
12
14-16
18
20-22
24
26-34
36
38-54
8
10
12
14-16
18
+
26-34
36
]X
2
3
L: FQZHW-02SB1
L+M: FQZHW-03SB1
_`
_`
{
{
`_
`_
`_
_
_
_
_`
_`
{
{
`_
`_
_
_
_
_
X|
X|
X|
X|
+_
+_
+
+
`_
_
_
X|
X|
X|
X|
+_
_
X|
X|
X|
+_
+_
+
+
`_
_
_
X|
X|
X|
+_
FQZHN-02SB1
FQZHN-02SB1
FQZHN-03SB1
FQZHN-03SB1
FQZHN-03SB1
FQZHN-03SB1
FQZHN-04SB1
FQZHN-04SB1
FQZHN-05SB1
FQZHN-05SB1
Table 4-5. Indoor unit main pipes (L2 to L8) and indoor
unit branch joint kits
Table 4-6. HT hydro modules pipes (L9, n, o) and branch
joint kits (only hydro modules connected downstream)
High Pressure
Gas Pipe
Pipe Diameter (mm OD)
Pipes
g1 to g3
G1
Number of outdoor units
Branch joint kit
Liquid
pipe
Low Pressure
Gas Pipe
_`
_`
_`
{
`_
_
_
A < 168
|X~ +
+~
~+{
+{~{
{~+
+
`_
_
X|
X|
+_
+
{
`_
_
_
X|
X|
X|
FQZHN-01SB1
FQZHN-02SB1
FQZHN-02SB1
FQZHN-03SB1
FQZHN-03SB1
FQZHN-04SB1
FQZHN-05SB1
High Pressure
Gas Pipe
Pipe Diameter (mm OD)
Total capacity
of downstream
indoor units
(× 100W)
Branch joint kit
Liquid pipe
_`
_`
_`
{
`_
_
_
B < 168
|X~ +
+~
~+{
+{~{
{~+
+
{
`_
_
_
X|
X|
X|
FQZHN-01SB1
FQZHN-02SB1
FQZHN-02SB1
FQZHN-03SB1
FQZHN-03SB1
FQZHN-04SB1
FQZHN-05SB1
Gas Pipe
Pipe Diameter (mm OD)
Total capacity
of downstream
hydro modules
(× 100W)
Branch joint kit
Note:
When the equivalent piping length from outdoor units to
the farthest indoor unit exceed 90 m, or the level
difference is greater than 50 m (outdoor unit is above) or
40 m (outdoor unit is below), the liquid pipe of the main
pipe (L1) should be increased as Table 4-12. More
details are explained in the part of “4.3.4 Permitted
piping lengths and level differences”.
NOTE
Notes:
1. Choose indoor main pipes from the above table in
accordance with total downstream indoor capacity,
which is the total capacity of all the indoor units, exclude
HT hydro modules, connected downstream. Do not let
the indoor unit main pipe exceed the main pipe chosen
by outdoor unit capacity.
2. The downstream indoor units do not include HT hydro
modules when calculate downstream indoor units
capacity. If one or more HT hydro modules are
connected to the system, the pipes (L9, n, o), only HT
hydro modules connected downstream, are selected
according to Tabe 4-6.
3. When the piping length between the farthest indoor
unit and first branch joint (A) exceed 40 m, increase the
diameter of the indoor main liquid pipes (the piping
between the first branch joint and MS box) as Table
4-12. If the increased liquid pipe size is larger than the
pipe size of the main liquid pipe (L1), also increase the
size of the main liquid pipe. More details are explained in
the part of “4.3.4 Permitted piping lengths and level
differences”.
Notes:
1. One or more HT hydro modules can be connected in
the system with the first branch joint or its downstream
branch joints, but never be connected under MS box or
header branches, as Fig. 4-1.
2. Choose HT hydro module pipes from the above table
in accordance with total downstream HT hydro modules
capacity, which is the total capacity of all the HT hydro
modules connected downstream.
9
