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Be sure to provide adequate maintenance space when installing the unit above the
ceiling.
(Refer to the installation restrictions contained in "5.2. Installation dimensions".)
5.6.1. Removing the pinch pipe
Melt the brazing fi ller metal on connecting part using a torch
and remove the pinch pipe.
If using the R-side
Pinch pipe
L-side
R-side
If using the L-side
Pinch pipe
Pinch pipe
L-side
R-side
5.6.2. Fix the unit (When hanging from the ceiling)
(1) Attach the hanger (accessories) to the hanger bolts as shown in the overview
diagram below. (in 4 places)
(2) After checking that the equipment is horizontal, fi rmly fi xed in place with the
nuts (fi eld supply) and washers (accessories).
Hanger bolt
(8 to 10)
Hexagonal nut
(Field supply)
Washers
(accessories)
Hanger
(accessories)
Hexagonal nut
(Double nut)
(Field supply)
6. PIPE INSTALLATION
6.1. Pipe selection
(1) Select the piping to connect to the RB unit.
Type A) If connecting 1 indoor unit downstream of the RB unit
Select the connection pipe from Table 1, based on the total
capacity of indoor units connected downstream.
Suction gas pipe
Liquid pipe
Discharge gas pipe
Gas pipe
Select the connection
pipe from Table 3, based
on the capacity of the
indoor unit connected.
CAUTION
Seal the unused pinch
pipe end by pinch
Pinch pipe
treating it.
Pinch pipe
Seal the pinch pipe end
on the unused side by
pinch treating it.
(Unit: mm)
RB unit
Liquid pipe
Indoor unit
Type B) If connecting 2 or more indoor units downstream of the RB unit
Select the connection pipe from Table 1, based on the
total capacity of indoor units connected downstream.
Suction gas pipe
Liquid pipe
Discharge gas pipe
Gas pipe
Select the connection pipe
from Table 2, based on
the total capacity of indoor
units connected down-
stream.
(2) If the size of the selected pipe is different from Table 4, use reducers (accessories)
to make the diameters match.
Connection pipe
Reducer
Reducer
Table 1) Indoor unit total capacity and RB unit upstream side connection pipe sizes
Total capacity of
Suction gas pipe
indoor unit (kW)
(mm (in.))
ø15.88 (5/8")
2.2 to 11.1
+Reducer
ø19.05 (3/4")
11.2 to 13.9
+Reducer
ø22.22 (7/8")
14.0 to 22.3
+Reducer
ø22.22 (7/8")
22.4 to 28.0
+Reducer
28.1 to 44.7
ø28.58 (1-1/8")
44.8 to 46.9
ø28.58 (1-1/8")
47.0 to 56.0
ø28.58 (1-1/8")
Table 2) Indoor unit total capacity and RB unit downstream side connection pipe sizes
Total capacity of
indoor unit (kW)
Gas pipe (mm (in.))
2.2 to 11.1
11.2 to 13.9
14.0 to 18.0
Table 3) Indoor unit capacity and connection pipe sizes
Downstream of RB unit
Indoor unit capacity
Gas pipe
(mm (in.))
ø12.7 (1/2")
2.2 , 2.8 , 3.6 , 4.0 , 4.5
+Reducer
ø15.88 (5/8")
5.6 , 7.1 , 8.0 , 9.0
+Reducer
11.2 , 12.5 , 14.0 , 18.0
ø19.05 (3/4")
Table 4) RB unit pipe size
Outdoor unit side
Suction gas
Discharge gas
Liquid pipe
(mm (in.))
(mm (in.))
(mm (in.))
pipe
pipe
ø28.58 (1-1/8")
ø22.22 (7/8")
ø15.88 (5/8")
RB unit
Liquid pipe
For piping from branch kit to
indoor unit, refer to the instal-
lation manual for the outdoor
unit.
Indoor unit
Indoor unit
RB unit
Upstream of RB unit
Discharge gas
Liquid pipe
pipe (mm (in.))
(mm (in.))
ø12.7 (1/2")
ø9.52 (3/8")
+Reducer
+Reducer
ø12.7 (1/2")
ø9.52 (3/8")
+Reducer
+Reducer
ø15.88 (5/8")
ø12.7 (1/2")
+Reducer
+Reducer
ø19.05 (3/4")
ø12.7 (1/2")
+Reducer
+Reducer
ø19.05 (3/4")
ø12.7 (1/2")
+Reducer
+Reducer
ø19.05 (3/4")
ø15.88 (5/8")
+Reducer
ø22.22 (7/8")
ø15.88 (5/8")
Downstream of RB unit
Liquid pipe (mm (in.))
ø15.88 (5/8")
ø9.52 (3/8")
+Reducer
ø19.05 (3/4")
ø9.52 (3/8")
ø22.22 (7/8")
ø12.7 (1/2")
+Reducer
+Reducer
Liquid pipe
(mm (in.))
ø6.35 (1/4")
+Reducer
ø9.52 (3/8")
ø9.52 (3/8")
Indoor unit side
Gas pipe
Liquid pipe
(mm (in.))
(mm (in.))
ø19.05 (3/4")
ø9.52 (3/8")
En-4
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