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Apply voltage terminal (CNA02, CNA102, CNA202, CNA302)
When a power supply must be provided at the input device you want to connect, use
the Apply voltage terminal (CNA02, CNA102, CNA202, CNA302)
DC power sup-
ply 12 - 24V
-
Load
resistance
*c
connected unit
*1: Make the power supply DC12 to 24V. Select a power supply capacity with an
ample surplus for the connected load.
Do not impress a voltage exceeding 24V across pins 1-3.
*c: The allowable current is DC 5mA to 10mA. (Recommended: DC5mA)
Provide a load resistance such that the current becomes DC10mA or less.
Select very low current use contacts (usable at DC12V, DC1mA or less).
*d: The polarity is [+] for pin 1 and [-] for pin 3. Connect correctly.
When connected to Apply voltage terminals of multiple RB units with a connected
unit, be sure to make a branch outside the RB unit using a pull box, etc. as shown on
below example.
DC power sup-
ply 12 - 24V
Load
resistance
connected unit
9.2. Cooling/heating priority function
"Edge" input only
Connector
Input signal
OFF → ON
CNA01 or CNA02
ON → OFF
On
CNA01 or CNA02
Off
Heating
Priority mode
Cooling
*1
PC board
+
+
1
2
CNA02
-
3
*d
PC board
CNA
02
PC board
CNA
02
Command
Heating priority
Cooling priority
10. MERGING 2 OR 4 BRANCHES
•
An indoor unit with a capacity exceeding 8.0 kW can be connected by
merging 2 or 4 indoor-unit-side outlet branches.
•
This chapter should be read only if 2- or 4-branch merging is planned.
•
To connect an indoor unit with a capacity exceeding 8.0 kW, use the option-
ally available separation tube kit.
•
For the installing of the separation tube kit, refer to the installation manual
for the kit.
10.1. Connection specifi cations
Typical examples
O.U.
I.U.
I.U.
Separation tube kit
(UTP-EX096A)
Connection specifi cations
Maximum capacity of
2-branch merging
connectable indoor
units per branch (Q)
4-branch merging
RB unit
I.U.
I.U.
I.U.
It is not possible to connect multiple indoor units downstream of the point where 2 or 4
branches are merged together.
10.2. Pipe installation (pipe selection)
Suction gas pipe
Liquid pipe
Discharge gas
Gas pipe
Select the connection
pipe from Table 1 ,
based on the capacity
of the indoor unit con-
nected.
Table1 ) Indoor unit capacity and connection pipe sizes
Indoor unit capacity
(kW)
Gas pipe
15.88(5/8'')
9.0, 10.0
+Reducer
11.2, 12.5, 14.0, 18.0
19.05(3/4'')
22.4, 25.0, 28.0
22.22(7/8'')
RB unit
Separation
I.U.
tube kit
(UTP-
EX060A)
8 < Q ≤ 18 KW
18 < Q ≤ 28 KW
I.U.
I.U.
RB unit
Liquid pipe
I.U.
I.U.
Downstream of RB unit
Outside diameter [mm(in)]
Liquid pipe
9.52(3/8'')
9.52(3/8'')
12.70(1/2'')
En-12
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