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2.3. Accessories
Do not discard the accessories required for installation until the installation work is
complete.
Name and shape
Installation Manual
Hanger
Washer
Tapping screw
(ø4×10)
Cable tie
Reducer type
Reducer-A
a
b
Reducer-B
a
b
Reducer-C
a
b
Reducer-D
a
с
b
Reducer-E
a
b
с
d
Reducer-F
a
b
с
d
Reducer-G
a
b
с
2.4. Optional parts
The following optional parts are available.
Description
Model No.
UTY-XWZXZ6
External connect kit
UTY-XWZXZB
3. CONNECTION SPECIFICATIONS
Basic connection specifi cations
O.U.
RB unit
I.U.
I.U.
Q'ty
Application
This manual
1
For suspending the RB unit from
ceiling
4
For suspending the RB unit from
ceiling
8
For suspending the RB unit from
ceiling
8
For mounting the transmission
cable
5
Q'ty
a: ø9.52 [O.D.]
b: ø12.7 [I.D.]
4
a: ø9.52 [O.D.]
b: ø6.35 [I.D.]
4
a: ø19.05 [O.D.]
b: ø22.22 [I.D.]
2
a: ø19.05 [O.D.]
b: ø12.7 [I.D.]
2
c: ø15.88 [I.D.]
a: ø28.58 [O.D.]
b: ø22.22 [I.D.]
2
c: ø19.05 [I.D.]
d: ø15.88 [I.D.]
a: ø22.22 [O.D.]
b: ø19.05 [I.D.]
2
c: ø15.88 [I.D.]
d: ø12.7 [I.D.]
a: ø15.88 [O.D.]
b: ø12.7 [I.D.]
2
c: ø9.52 [I.D.]
Application
For external input
(Dry contact terminal / CNA01)
For external input
(Apply voltage terminal / CNA02)
O.U.=Outdoor unit
I.U.=Indoor unit
I.U.
I.U.
I.U.
Up to 8 units
Table 1) Connection specifi cations
Maximum capacity of
1 RB unit
connectable indoor
units (Q)
2 RB units (in serial) *1
Maximum capacity of connectable indoor units per
branch (Q)
Maximum number of connectable indoor units per
branch
*1: Downstream of this unit, you can connect 1 RB unit of the same type.
● The total capacity of the indoor units connected downstream is calculated as follows.
Example of calculation: In the case that the model codes of the connected indoor units
are 07, 09, 12 and 18.
Q = 2.2kW + 2.8kW + 3.6kW + 5.6kW = 14.2kW
Table 2) Indoor unit model codes and model selection capacity
Model code
07
09
Indoor unit
2.2
2.8
capacity (Kw)
Model code
45
54
Indoor unit
12.5
14.0
capacity (Kw)
● For connectable indoor units, refer to the catalogue or the Design & Technical manu-
al.
● You must connect the indoor units with 3 or more branches. Consequently, a maxi-
mum of 2 spare branches is permitted per 1 refrigerant system.
RB unit
O.U.
I.U.
Restrictions on installation related to serial connections
Length:
To outdoor unit
1000 or less
RB unit
To indoor unit
4. PIPING SPECIFICATIONS
For details of piping specifi cations, refer to the outdoor unit installation manual.
5. INSTALLATION WORK
5.1. Selecting an installation location
Take into consideration whether the place you install the main unit can fully with-
stand its weight.
For hanger bolts, use embedded inserts or embedded foundation bolts in the case
of new installation, and use a hole-in-anchor if already installed, and attach in a
way so that the unit's weight can be supported.
Do not install this unit in the following areas:
• Area with high salt content, such as at the seaside. It will deteriorate metal parts,
causing the parts to fail or the unit to leak water.
• Area fi lled with mineral oil or containing a large amount of splashed oil or steam,
such as a kitchen. It will deteriorate plastic parts, causing the parts to fail or the unit
to leak water.
• Area that generates substances that adversely affect the equipment, such as sulfu-
ric gas, chlorine gas, acid, or alkali. It will cause the copper pipes and brazed joints
to corrode, which can cause refrigerant leakage.
• Area containing equipment that generates electromagnetic interference. It will cause
the control system to malfunction, preventing the unit from operating normally.
• Area that can cause combustible gas to leak, contains suspended carbon fi bers or
fl ammable dust, or volatile infl ammables such as paint thinner or gasoline. If gas
leaks and settles around the unit, it can cause a fi re.
• Area where small animals may live. It may cause failure, smoke or fi re if small
animals enter and touch internal electrical parts.
• Area where animals may urinate on the unit or ammonia may be generated.
Q ≤ 56.0kW
Q ≤ 18.0kW
Up to 8 units
→ Good
12
14
18
24
30
4.0
8.0
3.6
5.6
7.1
4.5
9.0
60
72
90
18.0
22.4
25.0
If connecting indoor
units with 3 branches,
you must connect
indoor units to the
branch furthest from
the outdoor unit.
I.U.
I.U.
(Unit: mm)
* The RB unit on the down-
stream side must be installed
at a lower height level than
the upstream RB unit.
RB unit
To indoor unit
WARNING
CAUTION
36
11.2
En-2
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