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Si39-303 Refrigerant Piping
Installation Manual
173
6.3 Example of Connection
Example of connection
(Connection of 8 indoor units Heat pump system)
One outdoor
unit installed
(RXYQ5~16)
Branch with refnet joint Branch with refnet joint and refnet header
Branch with refnet header
a
A B C D E F G
A B C
D
E F G
b c d e f
g
h i j k l m n
1 2 3 4 5 6 7
8
H2
H1
P
Outdoor unit
REFNET joint (A-G)
Indoor units (1-8)
H1
H1
H2
H2
a a
i
b
a
i
b
c d e f
g
h
1 2 3 4 5 6
Outdoor unit
Outdoor unit
REFNET joint (A • B)
Indoor units (1-8)
c d e f
g
h
1 2 3 4 5 6
Indoor units (1-8)
Refnet header
Refnet header
k
j
7 8
k
j
7 8
H1
H2
H2
Outdoor unit Refnet header
Indoor units (1-8)
c d e
f
g
h
b
1 2 3 4 5 6 7
8
8
a b c d e f
g
8
H2
H1
H3 H3
P
Indoor units (1-8)
Outdoor unit
REFNET joint (A-G)
REFNET joint (A • B)
h i j k l m n
1 2 3 4 5 6 7
First outdoor
branch
H1
H3
a
Outdoor unit
Refnet header
Indoor units (1-8)
c d e
f g
h b
1 2 3 4 5 6 7
When multiple
outdoor units
installed
(RXYQ18~) ∗
If the system capacity is RXYQ18 or more, re-read to
the first outdoor branch as seen from the indoor unit.
Maximum
allowable
length
Between outdoor
and indoor units
Between outdoor branch and indoor unit
(Only for RXYQ18 or more)
Between outdoor and indoor units
Between indoor and indoor units
Between outdoor and outdoor units
Actual pipe length
Actual pipe length
Actual pipe length
Difference in height
Difference in height
Difference in height
Equivalent length
Total extension length
Pipe length between outdoor and indoor units
≤
150m
Example unit 8: a + b + c + d + e + f + g + p
≤
150m
Example unit 8: b + c + d + e + f + g + p
≤
40m
Equivalent pipe length between outdoor and indoor units
≤
175m (assume equivalent pipe length of refnet joint to be 0.5m, that of refnet header to be 1m, calculation purposes)
Piping length from outdoor branch to outdoor unit
≤
10m Approximately length: max 13m
Difference in height between outdoor and indoor units (H1)
≤
50m (Max 40m if the outdoor unit is below)
Difference in height between adjacent indoor units (H2)
≤
15m
Difference in height between outdoor unit (main) and outdoor unit (sub) (H3)
≤
5m
Pipe length from first refrigerant branch kit (either refnet joint or refnet header ) to indoor unit
≤
40m
Total piping length from outdoor unit* to all indoor units
≤
300m
Allowable
height
length
Allowable length after the branch
Refrigerant branch kit selection
Pipe size selection
Example unit 8: a + i
≤
150m Example unit 6: a + b + h
≤
150m, unit 8: a + i + k
≤
150m
Example unit 8: i
≤
40m Example unit 6: b + h
≤
40m, unit 8:i + k
≤
40m
r
t
s
Outdoor unit
r
≤
10m (Approximately length: max 13m)
s
≤
10m (Approximately length: max 13m)
t
≤
10m (Approximately length: max 13m)
Refrigerant branch kits can only be
used with R410A.
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.
Piping between outdoor unit and refrigerant branch kit (part A)
• Match to the size of the connection piping on the outdoor unit.
Outdoor unit connection piping size
Piping between refrigerant branch kits
• Choose from the following table in accordance with the total capacity of all the
indoor units connected below this.
• Do not let the connection piping exceed the refrigerant piping size chosen by
general system model name.
For an outdoor unit multi installation (RXYQ18~48MY1B), make the
settings in accordance with the following figure.
How to calculate the additional refrigerant
to be charged
If a negative result is gotten for R from the formula at right, no refrigerant
needs to be added.
Additional referigerant to be charged R (Kg)
R should be rounded off in units of 0.1Kg.
Piping between outdoor branch
and indoor unit (part C)
Oil-equalizing line (part D)
Piping between outdoor branches (part B)
Piping between outdoor unit and refrigerant
branch kit (part A)
RXYQ5 type
RXYQ8, 10 type
RXYQ12~22 type
RXYQ24 type~
KHRP26M22T
KHRP26M33T
KHRP26M72T
KHRP KHRP73TP
• For refnet joints other than the first branch, select the proper branch kit model based on the total capacity index.
< 200
200
≤
x< 290
290
≤
x< 640
640 <
KHRP26M22T
KHRP26M33T
KHRP26M72T
KHRP KHRP73TP
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.
• Note: 250 type cannot be connected below the REFNET header.
< 200
< 290
290
≤
x< 640
640 <
KHRP26M22H (Max. 4 kit)
KHRP26M33H (Max. 8 kit)
KHRP26M72H (Max. 8 kit)
KHRP26M73H (Max. 8 kit) + KHRP26M73HP
How to choose an outdoor branch kit (needed if the outdoor unit capacity type is RXYQ18 or more.)
• Choose from the following table in accordance with the number of outdoor units.
2 unit
3 unit
BHF BHFP22M90P
BHFP BHFP22M135P
example in case of refnet joint C; indoor units 3 + 4 + 5 + 6 + 7 + 8
example in case of refnet joint B indoor units 7 + 8,
example in case of refnet header; indoor units 1 + 2 + 3 + 4 + 5 + 6
example in the case of refnet header; indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
Example of downstream indoor units
φ
9.5 × 0.80
φ
12.7 × 0.80
φ
15.9 × 0.99
φ
19.1 × 0.80
RXYQ5 type
RXYQ8 type
RXYQ10 type
RXYQ12, 14, 16 type
RXYQ18~22 type
RXYQ24 type
RXYQ26~34 type
RXYQ36~48 type
φ
15.9 × 0.99
φ
19.1 × 0.80
φ
22.2 × 0.80
φ
28.6 × 0.99
φ
34.9 × 1.21
φ
41.3 × 1.43
Gas pipe
indoor capacity index
Piping size (outer diameter x minimum thickness)
Liquid pipe
φ
9.5 × 0.80
φ
12.7 × 0.80
φ
15.9 × 0.99
φ
19.1 × 0.80
< 200
200
≤
x< 290
290
≤
x< 420
420
≤
x< 640
640
≤
x< 920
920 <
φ
15.9 × 0.99
φ
22.2 × 0.80
φ
28.6 × 0.99
φ
34.9 × 1.21
φ
41.3 × 1.43
Piping between outdoor branches (part B)
• Choose from the following table in accordance with the total capacity of all the
outdoor units connected above this.
Between refrigerant branch kit and indoor unit
• Pipe size for direct connection to indoor unit must be the same as the
connection size of indoor unit.
φ
6.4 × 0.80
φ
9.5 × 0.80
20, 25, 32, 40, 50 type
63, 80, 100, 125 type
200 type
250 type
φ
12.7 × 0.80
φ
15.9 × 0.99
φ
19.1 × 0.80
φ
22.2 × 0.80
Piping between outdoor branch and indoor unit (part C)
Gas pipe
outdoor capacity type
Piping size (outer diameter x minimum thickness)
Liquid pipe
φ
12.7 × 0.80
φ
9.5 × 0.80
RXYQ8 type
RXYQ10 type
RXYQ12, 14, 16 type
φ
19.1 × 0.80
φ
22.2 × 0.80
φ
28.6 × 0.99
a:
φ
19.1 × 30m
b:
φ
15.9 × 10m
c:
φ
0 9.5 × 10m
d:
φ
9.5 × 10m
e:
φ
9.5 × 10m
f :
φ
9.5 × 10m
g:
φ
1 6.4 × 10m
h:
φ
1 6.4 × 20m
i :
φ
12.7 × 10m
j :
φ
1 6.4 × 10m
k:
φ
1 6.4 × 1 9m
Oil-equalizing line (Only for RXYQ18 or more) (part D)
φ
6.4 × 0.80 Piping size (outer diameter x minimum thickness)
φ
15.9 × 0.99
φ
19.1 × 0.80
< 22HP
24HP
26HP <
φ
28.6 × 0.99
φ
34.9 × 1.21
(Unit:mm)
(Unit:mm)
(Unit:mm)
(Unit:mm)
(Unit:mm)
(Unit:mm)
R= +
indoor capacity index
Refrigerant branch kit name
Number of outdoor units Branch kit name
Outdoor unit capacity type Refrigerant branch kit name
indoor capacity index
Refrigerant branch kit name
Gas pipe
Outdoor unit capacity type
Piping size (outer diameter x minimum thickness)
Liquid pipe
Gas pipe
outdoor capacity index
Piping size (outer diameter x minimum thickness)
Liquid pipe
Gas pipe
indoor capacity type
Piping size (outer diameter x minimum thickness)
Liquid pipe
+ +
+ + _
If the outdoor unit is
RXYQ34MY1B and the
piping lengths are as at
right
R= 30 0.25 + 10 0.17 + 10 0.11 + 40 0.054 + 49 0.022 - 6 =7.538
b a c+d+e+f g+h+j+k i 7.5
NOTE:
Total length (m)
of liquid piping
size at
φ
22.2






×0.35
Total length (m)
of liquid piping
size at
φ
19.1






×0.25
Total length (m)
of liquid piping
size at
φ
15.9






×0.17
Total length (m)
of liquid piping
size at
φ
12.7






×0.11
Total length (m)
of liquid piping
size at
φ
9.5






×0.054
Total length (m)
of liquid piping
size at
φ
6.4






×0.022
Model name
RXYQ5~16MY1B
RXYQ18~32MY1B
RXYQ34~48MY1B 0 kg
3 kg
6 kg
Amount of refrigerant
Example for refrigerant branch using refnet joint and refnet header for RXYQ34MY1B
A B
A B
i