En-11
9. EXTERNAL INPUT
•
RB unit can be switched cooling priority and heating priority by using RB unit
PC board CNA01 or CNA02.
•
The "external input priority mode" must be set by changing DIP switch SET2-
1,2 on PC board of RB unit.
•
A twisted pair cable (22AWG) should be used. Maximum length of cable is
492 ft (150 m).
•
Use an external input cable with appropriate external dimension, depending
on the number of cables to be installed.
• The wire connection should be separate from the power cable line.
INPUT SELECT
Use either one of these types of terminal according to the application. (Both types of
terminals cannot be used simultaneously.
Dry contact terminal ([CNA01])
When a power supply is unnecessary at the input device you want to connect, use
the Dry contact terminal ([CNA01]).
*a: Select very low current use
contacts (usable at DC12V,
DC1mA or less).
*b: The wiring is different from
Apply voltage terminals. Be suf-
fi
ciently careful when wiring.
1
2
connected unit
PC Board
GND
*a
*b
CNA01
When connected to Dry contact terminals of multiple RB units with a connected unit,
insulate each RB unit with relay, etc. as shown on below example.
RB
u
n
it
RB
u
n
it
P
ow
er s
up
pl
y f
or r
el
ay
Input device
K1-K2 : Relay
(Device for DC current)
PC board
PC board
K1
K2
CNA 01
CNA 01
NOTE :
When connected to multiple RB units directly, it will cause breakdown.
Apply voltage terminal ([CNA02])
When a power supply must be provided at the input device you want to connect, use
the Apply voltage terminal ([CNA02])
1
2
3
+
+
-
-
Input
de
vic
e
Load
resistance
*1
DC power sup-
ply 12 - 24V
connected unit
PC board
CNA02
*c
*d
*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 10 mA. (Recommended: DC 5mA)
Provide a load resistance such that the current becomes DC 10mA or less.
Select very low current use contacts (usable at DC 12V, DC 1mA 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.
In
p
u
t d
ev
ic
e
RB
u
n
it
RB
u
n
it
Load
resistance
DC power
supply 12 - 24V
connected unit
PC board
PC board
CNA
02
CNA
02
COOLING/HEATING PRIORITY FUNCTION
"Edge" input only
Connector
Input signal
Command
CNA01 or CNA02
OFF
→
ON
Heating priority
ON
→
OFF
Cooling priority
CNA01 or CNA02
Priority mode
Heating
On
Off
Cooling
10. TEST RUN
10.1. Test run using Outdoor unit (PC board)
• Refer to the Installation Manual for the outdoor unit to perform the test run using the
outdoor unit.
10.2. Test run using Remote Controller
• Refer to the Installation Manual for the remote controller to perform the test run
using the remote controller.
11. CHECK LIST
Pay special attention to the check items below when installing the RB unit (s). After
installation is complete, be sure to check the following check items again.
CHECK ITEMS
If not performed correctly
CHECK
BOX
Has the RB unit been installed
correctly?
Vibration, noise, RB unit may
drop
Has there been a check for gas
leaks (refrigerant pipes)?
No cooling, No heating
Has heat insulation work been
completed?
Water leakage
Is the voltage of the power source
the same as that indicated on the
label on the RB unit?
No operation, heat or burn
damage
Is the address setting correctly
configured?
No operation
Are the wires and pipes all
connected completely?
No operation, heat or burn
damage
Is the RB unit earthed (grounded)?
Short circuit
Is the connection cable the specified
thickness?
No operation, heat or burn
damage
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2015/2/26 13:11:34
