English
10
7-7 Example of connection
Example of connection
(Connection of 7 units heat pump system)
Branch with refnet joint
Maxim
um
allo
w
ab
le
length
Allo
w
ab
le length after the br
anch
∗
2 Br
anch kit are recommanded to set as possib
le
as near the BP units
.
c, d, e are recommanded to be as possib
le as shor
t.
Betw
een indoor and indoor units
Betw
een BP and BP units
Betw
een outdoor and BP units
Betw
een outdoor and indoor units
Betw
een BP and indoor unit
Betw
een BP and indoor units
Betw
een outdoor and BP units
Piping length
Piping length
Diff
erence in height
Diff
erence in height
Diff
erence in height
Diff
erence in height
1 room length
Total piping length
Total piping length
Pipe length betw
een outdoor and BP units
≤
180 ft (55m)
Pipe length betw
een outdoor unit and first refr
iger
ant br
anch kit (refnet joint)
≥
16.4 ft (5m)
[Example] a
≥
16.4 ft (5m)
Piping length betw
een BP and indoor units:
262ft (80m)
[Example] a+b+c+d+e
≤
180 ft (55m)
Piping length betw
een BP and indoor unit
≤
49 ft (15m)
Diff
erence in height betw
een outdoor and indoor units (H1)
≤
98 ft (30m)
Diff
erence in height betw
een outdoor and BP units (H2)
≤
98 ft (30m)
Diff
erence in height betw
een BP and BP units (H3)
≤
49 ft (15m)
Refr
iger
ant br
anch kit (refnet joint) name :
KHRP26M22T
Diff
erence in height betw
een indoor and indoor units (H4)
≤
49 ft (15m)
Piping length from first refr
iger
ant br
anch kit (refnet joint) to indoor unit
≤
131 ft (40m)
[Example] unit 6:
b+c+k
≤
131 ft (40m)
[Example] unit 5:
b+e+j
≤
131 ft (40m)
[Example] unit 3:
d+h
≤
131 ft (40m)
Allo
w
ab
le
height
Minim
um allo
w
ab
le length
∗
1 Since the sound of refr
iger
ant ma
y be tr
ansf
erred from
the outdoor unit to the indoor unit, mak
e the pipe length
from the outdoor unit to the first junction 16.4 ft (5 m) or longer
.
Refr
iger
ant br
anch kit selection refr
iger
ant br
anch kits can only be used with R410A
Ho
w to calculate the ad
ditional refrig
erant to be c
har
g
ed
Additional refr
iger
ant to be charged R (lb
. /kg)
R should be rounded off in units of 0.1 lb
. (0.1kg).
Pipe siz
e selection
φ
1/2
×
0.031 (
φ
12.7
×
0.8)
φ
5/8
×
0.039 (
φ
15.9
×
1.0)
φ
1/4
×
0.031 (
φ
6.4
×
0.8)
φ
3/4
×
0.039 (
φ
19.1
×
1.0)
φ
5/8
×
0.031 (
φ
15.9
×
1.0)
φ
3/8
×
0.031 (
φ
9.5
×
0.8)
φ
3/8
×
0.031 (
φ
9.5
×
0.8)
φ
3/8
×
0.031 (
φ
9.5
×
0.8)
Tab
le A
∗
Qc
, Qd, Qe is total connected indoor capacity
[Example]
indoor 1:
9000 Btu/h
indoor 2:
12000 Btu/h
indoor 3:
18000 Btu/h
=>
(Gas pipe)
φ
5/8 × 0.031 (
φ
15.9 × 1.0) / (Liquid pipe)
φ
3/8 × 0.031 (
φ
9.5 × 0.8)
∗
c, d, e indicates the symbols in the figure
Gas pipe
Total indoor capacity Q
Liquid pipe
Qc
, Qd, Qe
≤
17000 Btu (5.0 kW)
Qc
, Qd, Qe
>
17000 Btu (5.0 kW)
•
Piping siz
e (Outer diameter × minim
um thic
kness)
R=
+
Total length (ft / m)
of liquid piping siz
e at
φ
1/4 inch (
φ
6.4 mm)
×
0.015 lb
./ft
(0.022 kg/m)
R=[(a+b+d+e)
×
]+[(c+f+g+h+i+j+k+ )
×
]=[ × ]+[ × ]=
0.036 (0.054)
0.015 (0.022)
0.036 (0.054)
0.015 (0.022)
8.118
→
8.1 lb
.
(3.766
→
3.8kg)
234 (73)
128 (40)
×
0.036 lb
./ft
(0.054 kg/m)
Total length (ft / m)
of liquid piping siz
e at
φ
3/8 inch (
φ
9.5 mm)
[Example] f
or refr
iger
ant br
anch using refnet joint
unit :
inch× ft (mm× m)
Betw
een refr
iger
ant br
anch kit and BP unit
Betw
een refr
iger
ant br
anch kit and refr
iger
ant br
anch kit
Betw
een outdoor unit and first refr
iger
ant br
anch kit
a
symbol
Gas pipe
Liquid pipe
b
c, d, e
See the tab
le A
indoor unit
BP unit
refrigerant branch kit (refnet joint)
Qd = 39000 Btu/h
BP
A
1
1
a
12
BP
BP
3
45
6
d
fg
h
ij
k
e
bc
H1
H4
H2
H3
A
1
2
BP
3
B
7
[Example] f+g+h+i+j+k+
≤
262ft (80m)
[Example] f
, g, h, i, j, k,
≤
49 ft (15m)
a:
φ
3/8 × 32 (
φ
9.5 × 10)
b:
φ
3/8 × 32 (
φ
9.5 × 10)
c:
φ
1/4 × 32 (
φ
6.4 × 10)
d:
φ
3/8 × 32 (
φ
9.5 × 10)
e:
φ
3/8 × 32 (
φ
9.5 × 10)
f :
φ
1/4 × 32 (
φ
6.4 × 10)
g:
φ
1/4 × 32 (
φ
6.4 × 10)
h:
φ
1/4 × 32 (
φ
6.4 × 10)
i :
φ
1/4 × 32 (
φ
6.4 × 10)
j :
φ
1/4 × 32 (
φ
6.4 × 10)
k:
φ
1/4 × 16 (
φ
6.4 × 5)
:
φ
1/4 × 26 (
φ
6.4 × 8)
unit :
inch (mm)
01_EN_3P329623-1.fm Page 10 Friday, November 9, 2012 6:50 PM
