Table of Contents
Advertisement
5.5.2. Fix the unit (When hanging from the ceiling)
(1) Attach the hanger 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 (locally purchased) and washers (accessories).
Hanger bolt
(8 to 10)
Washers
(accessories)
Hanger
Hexagonal nut
(locally purchased)
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
Select the connection
pipe from Table 3, based
on the capacity of the
indoor unit connected.
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
En-5
(Unit: mm)
Hexagonal nut
(locally purchased)
RB unit
Gas pipe
Liquid pipe
Indoor unit
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
Table 1) Indoor unit total capacity and RB unit upstream side connection pipe sizes
Total capacity of
indoor unit (kW)
Liquid pipe
ø9.52 (3/8")
1.1 to 11.1
+ Reducer
ø9.52 (3/8")
11.2 to 13.9
+ Reducer
ø12.70 (1/2")
14.0 to 22.3
+ Reducer
ø12.70 (1/2")
22.4 to 28.0
+ Reducer
ø12.70 (1/2")
28.1 to 44.7
+ Reducer
ø15.88 (5/8")
44.8 to 46.9
+ Reducer
ø15.88 (5/8")
47.0 to 56.0
+ Reducer
ø15.88 (5/8")
56.1 to 80.0
+ Reducer
80.1 to 95.0
ø19.05 (3/4")
• If there is a plan or possibility of adding indoor units in the future, select a pipe
diameter that can support the increased connected capacity.
Table 2) Indoor unit total capacity and RB unit downstream side connection
pipe sizes
Total capacity of
indoor unit (kW)
2.2 to 8.0
• To make sure that the piping diameters match, cut the RB unit outlet branch fi rst
before connecting it to the mating pipe.
Table 3) Indoor unit capacity and connection pipe sizes
Indoor unit capacity (kW)
1.1, 2.2, 2.8, 3.6, 4.0, 4.5
5.6, 7.1, 8.0
To connect an indoor unit with a capacity exceeding
8.0 kW, an optionally available separation tube kit
Over 8.0
must be used to merge 2 or 4 outlet pipe branches.
For more detail, refer to the separation tube kit instal-
lation manual.
*1) To make sure that the piping diameters match, cut the RB unit outlet branch fi rst
before connecting it to the mating pipe.
Table 4) RB unit pipe size
Outdoor unit side
Outside diameter [mm(in)]
Suction gas pipe Discharge gas pipe
ø34.92 (1-3/8")
ø28.58 (1-1/8")
(3) Indoor unit model codes and model selection capacity
Model code
04
07
Indoor unit
1.1
2.2
capacity (Kw)
Model code
34
36
Indoor unit
10.0
11.2
capacity (Kw)
Upstream of RB unit
Outside diameter [mm(in)]
Discharge gas pipe
Suction gas pipe
ø12.70 (1/2")
ø15.88 (5/8")
+ Reducer
+ Reducer
ø12.70 (1/2")
ø19.05 (3/4")
+ Reducer
+ Reducer
ø15.88 (5/8")
ø22.22 (7/8")
+ Reducer
+ Reducer
ø19.05 (3/4")
ø22.22 (7/8")
+ Reducer
+ Reducer
ø19.05 (3/4")
ø28.58 (1-1/8")
+ Reducer
+ Reducer
ø19.05 (3/4")
ø28.58 (1-1/8")
+ Reducer
+ Reducer
ø22.22 (7/8")
ø28.58 (1-1/8")
+ Reducer
+ Reducer
ø28.58 (1-1/8")
ø34.92 (1-3/8")
ø28.58 (1-1/8")
ø34.92 (1-3/8")
Downstream of RB unit
Outside diameter [mm(in)]
Gas pipe
Liquid pipe
ø15.88 (5/8")
ø9.52 (3/8")
Downstream of RB unit
Outside diameter [mm(in)]
Gas pipe
Liquid pipe
ø12.70 (1/2")
ø6.35 (1/4")
ø15.88 (5/8") *1
ø9.52 (3/8") *1
Indoor unit side
Outside diameter [mm(in)]
Liquid pipe
Gas pipe
Liquid pipe
ø19.05 (3/4")
Φ12.7 (1/2")
Φ6.35 (1/4")
09
12
14
18
24
4.0
2.8
3.6
5.6
7.1
4.5
45
54
60
72
90
12.5
14.0
18.0
22.4
25.0
30
8.0
9.0
96
28.0
Advertisement
Table of Contents
