EMRQ8~16ABY1
Daikin Altherma outdoor unit
4P501819-1 – 2017.08
Installation manual
12
9.3.
Selection of refrigerant branch kits
Refrigerant refnets
■
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 (example: refnet joint a)
■
For refnets joints other than the first branch (example refnet
joint b), select the proper branch kit model based on the total
capacity index of all indoor units connected after the refrigerant
branch.
■
Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units
connected below the refnet header:
9.4.
System piping limitations
Piping length restrictions
Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable level difference and
allowable length after branching as indicated below:
Maximum allowable lengths
Actual pipe length between outdoor and indoor unit
≤
100 m
Example 1: a+b+c+d+e
≤
100 m
Example 2: a+f+h
≤
100 m
Example 3: a+f
≤
100 m
Equivalent piping length between indoor and outdoor units
≤
120 m
(equivalent pipe length of refnet to be taken 0.5 m and for header
1.0 m)
Total piping length from outdoor to all indoor units
≤
300 m
Pipe length from first branch kit (either refnet joint or refnet header) to
indoor unit
≤
40 m
[Example 1]: unit 5: b+c+d+e
≤
40 m
[Example 2]: unit 3: b+e
≤
40 m, unit 5: f+h
≤
40 m
[Example 3]: unit 5: f
≤
40 m
Maximum allowable height difference
Difference in height between outdoor and indoor units H1
≤
40 m
Difference in height between lowest and heighest indoor unit
H2
≤
15 m
Refrigerant branch kit name
Outdoor unit
capacity type (Hp)
2 pipes
8+10
KHRQ22M29T9
12~16
KHRQ22M64T
Refrigerant branch kit name
Indoor unit
capacity index
2 pipes
<200
KHRQ22M20T
200
≤
x<290
KHRQ22M29T
290
≤
x<520
KHRQ22M64T
Refrigerant branch kit name
Indoor unit
capacity index
2 pipes
<200
KHRQ22M29H
200
≤
x<290
KHRQ22M29H
290
≤
x<520
KHRQ22M64H
NOTE
Refrigerant branch kits can only be used with R410A.
Example 1: Branch with refnet joint
Example 2: Branch with refnet joint and refnet header
Example 3: Branch with refnet header
a
b
c
d
e
H1
A
B
C
D
1
2
3
4
5
H2
f
g
h
i
H1
H2
a
f
b
c
d
e
h
g
4
5
A
B
1
2
3
a
H1
b
c
d
1
2
3
e
4
f
5
H2
NOTE
When the equivalent pipe length between outdoor and
indoor units is 90 m or more, the size of the main liquid
pipe must be increased. Never increase discharge gas
pipe sizes.
Depending on the length of the piping, the capacity
may drop, but even in such a case it is possible to
increase the size of the main liquid pipe.
Make sure to perform the piping installation within the
range of the maximum allowable pipe length, allowable
level difference and allowable length after branching as
indicated above.
HP
Liquid Ø (mm)
8+10
9.5
→
12.7
12~16
12.7
→
15.9
4PEN501819-1.book Page 12 Wednesday, September 13, 2017 12:52 PM
