Specifications

SiBE28-805 Example of connection (R-410A Type)
Appendix 245
5. Example of connection (R-410A Type)
Example of connection
(Connection of 4 indoor units Heat Pump system)
Branch with refnet joint Branch with refnet joint and refnet header Branch with refnet header
One outdoor unit installed
Maximum allowable length Between outdoor and indoor units
Actual pipe length
Pipe length between outdoor and indoor units ≤165 m
[Example] unit 4: a+b+c+d+h≤165 m [Example] unit 3: a+b+e≤165 m, unit 4: a+f+g≤165 m [Example] unit 4: a+e≤165 m
Equivalent length
Equivalent pipe length between outdoor and indoor units ≤190 m (Assume equivalent pipe length of refnet joint to be 0.5 m and of the refnet header to be 1.0 m.
(for
calculation purposes))
Total extension length Total piping length from outdoor unit to all indoor units ≤200 m
Allowable height
Between outdoor and indoor units
Difference in height Difference in height between outdoor and indoor units (H1)≤30 m
Between indoor and indoor units
Difference in height Difference in height between adjacent indoor units (H2)≤4 m
Allowable length after the branch
Actual pipe length
Pipe length from first refrigerant branch kit (either refnet joint or refnet header) to indoor unit ≤40 m (See note on next page)
[Example] unit 4: b+c+d+h≤40 m
[Example] unit 3: b+e≤40 m, unit 4: f+g≤40 m
[Example] unit 4: e≤40 m
Refrigerant branch kit selection
Refrigerant branch kits can only be used with R-410A.
How to select the refnet joint
• When using refnet joints at the first branch counted from the outdoor unit side.
Choose from the following table in accordance with the capacity of the outdoor unit.
• For refnet joints other than the first branch, select the proper branch kit model based on
the total capacity index.
How to select the refnet header
• Choose from the following table in accordance with the total capacity of all the indoor
units connected below the refnet header.
Example of downstream indoor units
[Example]
in case of refnet joint C; indoor units 3+4
[Example]
in case of refnet joint B; indoor unit 4,
in case of refnet header; indoor units 1+2+3
[Example]
in case of refnet header;
indoor units 1+2+3+4
indoor unit
refnet joint
refnet header
ab c d
H1
h
ABCD
123
4
H2
efg
H1
H2
a
f
b
cde
g
4
A
B
12 3
a
H1
H2
cd
e
b
123
4
Outdoor unit capacity type Refrigerant branch kit name
CMSQ200 KHRQ22M20T
CMSQ250 KHRQ22M29T9
Indoor capacity type Refrigerant branch kit name
<200 KHRQ22M20T
200≤x<250 KHRQ22M29T9
Indoor capacity type Refrigerant branch kit name
50~125 KHRQ22M29H