Example Of Connection (R-410A Type) - Daikin CMSQ200A7W1B Service Manual

SiBE28-805

5. Example of connection (R-410A Type)

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