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5.7.3. Fix the unit (When hanging on the wall)
Use the tapping screw B (accessories) to set up this unit.
6. PIPE INSTALLATION
6.1. Pipe selection
Select the pipe to connect to the RB unit.
Connection example 1
(Liquid pipe)
Discharge
gas pipe
Outdoor
unit
Suction
gas pipe
Select the connection pipe from Table
2 below, based on the capacity of the
indoor unit connected downstream.
Connection example 2
(Liquid pipe)
Discharge
gas pipe
Outdoor
unit
Suction
gas pipe
Select the connection pipe from Table 3
below, based on the total capacity of the
indoor unit connected downstream.
If the size of the selected pipe is different from the Table 1 below, use reducers (ac-
cessories) to make the diameters match.
Discharge
gas pipe
Suction
gas pipe
Reducer
Install the liquid pipe after referring to the outdoor unit installation manual for its diameter.
(1) UTP-RX01AH
Table 1) RB unit pipe size
Suction gas
Discharge gas
pipe (mm (in))
pipe (mm (in))
ø12.7 (1/2")
ø9.52 (3/8")
Table 2) Connection pipe selection for when only 1 indoor unit is connected.
Indoor unit capacity
Suction gas
(kW)
pipe (mm (in))
2.2 ,2.8 , 3.6, 4.0, 4.5
ø12.7 (1/2")
ø15.88 (5/8")
5.6 ,7.1 ,8.0
+Reducer
Table 3) Connection pipe selection for when 2 to 3 indoor units are connected.
Total capacity of
Suction gas
indoor unit
pipe (mm (in))
(kW)
4.4 to 8.0
ø15.88 (5/8")
+Reducer
En-5
Gas pipe
RB
unit
Indoor
unit
Gas pipe
RB
unit
Indoor
unit
RB unit
Reducer
Gas pipe
(mm (in))
ø12.7 (1/2")
Discharge gas
pipe (mm (in))
(mm (in))
ø9.52 (3/8")
ø12.7 (1/2")
ø12.7 (1/2")
ø15.88 (5/8")
+Reducer
+Reducer
Discharge gas
pipe (mm (in))
(mm (in))
ø12.7 (1/2")
ø15.88 (5/8")
+Reducer
+Reducer
(2) UTP-RX01BH
Table 1) RB unit pipe size
Suction gas
pipe (mm (in))
ø19.05 (3/4")
Table 2) Connection pipe selection for when only 1 indoor unit is connected.
Indoor unit capacity
(kW)
2.2, 2.8, 3.6, 4.0, 4.5
5.6, 7.1, 8.0, 9.0
11.2, 12.5, 14.0
18.0
Table 3) Connection pipe selection for when 2 to 8 indoor units are connected.
Total capacity of
indoor unit
(kW)
4.4 to 11.1
11.2 to 13.9
14.0 to 18.0
(3) UTP-RX01CH
Table 1) RB unit pipe size
Indoor
unit
Suction gas
pipe (mm (in))
ø22.22 (7/8")
Table 2) Connection pipe selection for when only 1 indoor unit is connected.
Indoor unit capacity
Gas pipe
(kW)
22.4 , 25.0
Table 3) Connection pipe selection for when 2 to 8 indoor units are connected.
Total capacity of
indoor unit
(kW)
18.1 to 22.3
22.4 to 28.0
(4) Indoor unit model codes and model selection capacity
Model code
Gas pipe
Indoor unit
capacity (Kw)
Model code
Indoor unit
capacity (Kw)
6.2. Selecting the pipe material
Gas pipe
Copper pipes
It is necessary to use seamless copper pipes and it is desirable that the amount of
residual oil is less than 40 mg/10 m. Do not use copper pipes having a collapsed, de-
formed or discolored portion (especially on the interior surface). Otherwise, the expan-
sion valve or capillary tube may become blocked with contaminants.
As an air conditioner using R410A incurs pressure higher than when using conventional
refrigerant (R22), it is necessary to choose adequate materials.
Thicknesses of copper pipes used with R410A are as shown in the table. Never use
copper pipes thinner than that in the table even when it is available on the market.
Discharge gas
Gas pipe
pipe (mm (in))
(mm (in))
ø12.7 (1/2")
ø19.05 (3/4")
Suction gas
Discharge gas
pipe (mm (in))
pipe (mm (in))
ø12.7 (1/2")
ø9.52 (3/8")
+Reducer
+Reducer
ø15.88 (5/8")
ø12.7 (1/2")
+Reducer
ø19.05 (3/4")
ø12.7 (1/2")
ø15.88 (5/8")
ø19.05 (3/4")
+Reducer
Suction gas
Discharge gas
pipe (mm (in))
pipe (mm (in))
ø15.88 (5/8")
ø12.7 (1/2")
+Reducer
ø19.05 (3/4")
ø12.7 (1/2")
ø22.22 (7/8")
ø15.88 (5/8")
+Reducer
+Reducer
Discharge gas
Gas pipe
pipe (mm (in))
(mm (in))
ø19.05 (3/4")
ø22.22 (7/8")
Suction gas
Discharge gas
pipe (mm (in))
pipe (mm (in))
ø22.22 (7/8")
ø19.05 (3/4")
Suction gas
Discharge gas
pipe (mm (in))
pipe (mm (in))
ø15.88 (5/8")
ø22.22 (7/8")
+Reducer
ø22.22 (7/8")
ø19.05 (3/4")
07
09
12
14
18
4.0
2.2
2.8
3.6
5.6
4.5
45
54
60
72
90
12.5
14.0
18.0
22.4
25.0
Gas pipe
(mm (in))
ø12.7 (1/2")
+Reducer
ø15.88 (5/8")
+Reducer
ø19.05 (3/4")
ø19.05 (3/4")
Gas pipe
(mm (in))
ø15.88 (5/8")
+Reducer
ø19.05 (3/4")
ø22.22 (7/8")
+Reducer
Gas pipe
(mm (in))
ø22.22 (7/8")
Gas pipe
(mm (in))
ø22.22 (7/8")
ø22.22 (7/8")
24
30
36
8.0
7.1
11.2
9.0
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