RMXS48LVJU Installation Manual

English 10
7-7 Example of connection
Example of connection (Connection of 7 units heat pump system)
Branch with refnet joint
Maximum allowable length
Allowable length after the branch ∗2 Branch kit are recommanded to set as possible
as near the BP units. c, d, e are recommanded to be as possible as short.
Between indoor and indoor units Between BP and BP units Between outdoor and BP units Between outdoor and indoor units Between BP and indoor unit Between BP and indoor units Between outdoor and BP units
Piping length Piping length Difference in height Difference in height Difference in height Difference in height 1 room length Total piping length Total piping length
Pipe length between outdoor and BP units ≤ 180 ft (55m) Pipe length between outdoor unit and first refrigerant branch kit (refnet joint) ≥ 16.4 ft (5m) [Example] a ≥ 16.4 ft (5m) Piping length between BP and indoor units: 262ft (80m) [Example] a+b+c+d+e ≤ 180 ft (55m) Piping length between BP and indoor unit ≤ 49 ft (15m) Difference in height between outdoor and indoor units (H1) ≤ 98 ft (30m) Difference in height between outdoor and BP units (H2) ≤ 98 ft (30m)
Difference in height between BP and BP units (H3) ≤ 49 ft (15m)
Refrigerant branch kit (refnet joint) name : KHRP26M22T Difference in height between indoor and indoor units (H4) ≤ 49 ft (15m) Piping length from first refrigerant branch 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)
Allowable height
Minimum allowable length ∗1 Since the sound of refrigerant may be transferred from
the outdoor unit to the indoor unit, make the pipe length from the outdoor unit to the first junction 16.4 ft (5 m) or longer.
Refrigerant branch kit selection refrigerant branch kits can only be used with R410A
How to calculate the additional refrigerant to be charged
Additional refrigerant to be charged R (lb. /kg) R should be rounded off in units of 0.1 lb. (0.1kg).
Pipe size 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)
Table 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) φ5/8 × 0.031 (φ15.9 × 1.0) / (Liquid pipe) φ3/8 × 0.031 (φ9.5 × 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 size (Outer diameter × minimum thickness)
R=
+
Total length (ft / m) of liquid piping size at φ1/4 inch (φ6.4 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 size at φ3/8 inch (φ9.5 mm)
   
   
[Example] for refrigerant branch using refnet joint
unit : inch× ft (mm× m)
Between refrigerant branch kit and BP unit Between refrigerant branch kit and refrigerant branch kit Between outdoor unit and first refrigerant branch kit a
symbol Gas pipe Liquid pipe
b c, d, e See the table 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