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5.6. External input and external output (Optional parts)
5.6.1 External input
• Indoor unit can be Operation/Stop, Emergency stop or Forced stop by using indoor unit
PCB CNA01 or CNA02.
• "Operation/Stop" mode, "Emergency stop" mode or "Forced stop" mode can be selected
with function setting of indoor unit.
• Indoor unit can be Forced thermostat off by using indoor unit PCB CNA03 or CNA04.
• A twisted pair cable (22 AWG) should be used. Maximum length of cable is 192 ft (150
m).
• Use an external input and output 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.)
● Apply voltage terminal ([CNA01], [CNA03])
When a power supply must be provided at the input device you want to connect, use the
Apply voltage terminal ([CNA01], [CNA03]).
DC power supply
12 to 24V
Load
resistance
*a
Load
resistance
*a
Load
resistance
*a
Connected unit
*1: Make the power supply DC 12 to 24 V. Select a power supply capacity with an ample
surplus for the connected load.
Do not impress a voltage exceeding 24 V across pins 1-2, and 1-3.
*a: The allowable current is DC 5 mA to 10 mA. (Recommended: DC 5 mA)
Provide a load resistance such that the current becomes DC 10 mA or less.
Select very low current use contacts (usable at DC 12 V, DC 1 mA or less).
*b: The polarity is [+] for pin 1 and [-] for pin 2 and 3. Connect correctly.
When connected to Apply voltage terminals of multiple indoor units with a connected unit,
be sure to make a branch outside the indoor unit using a pull box, etc. as shown on below
example.
DC power supply
12 to 24V
Load
resistance
Load
resistance
Connected unit
● Dry contact terminal ([CNA02], [CNA04])
When a power supply is unnecessary at the input device you want to connect, use the Dry
contact terminal ([CNA02], [CNA04]).
*c
*c
Ch 1
Ch 2
*c
Ch 3
Connected unit
*c: Select very low current use contacts (usable at DC 12 V, DC 1 mA or less).
*d: The wiring is different from Apply voltage terminals. Be sufficiently careful when wiring.
When connected to Dry contact terminals of multiple indoor units with a connected unit,
insulate each indoor unit with relay, etc. as shown on below example.
P.C.B
*1
CNA01
*b
Operation behavior
● Input signal type
The input signal type can be selected.
It is switched by DIP switch on the indoor unit PCB.
CNA03
● When function setting is "Operation/Stop" mode.
[In the case of "Edge" input]
[In the case of "Pulse" input]
P.C.B
* The last command has priority.
* The indoor units within the same remote controller group operates in the same mode.
CNA01
● When function setting is "Emergency stop" mode.
[In the case of "Edge" input]
P.C.B
CNA01
P.C.B
[In the case of "Pulse" input]
CNA01
* All indoor units of same refrigerant system stops when Emergency stop operates.
● When function setting is "Forced stop" mode.
[In the case of "Edge" input]
P.C.B
CNA02
GND
*d
[In the case of "Pulse" input]
CNA04
* When the forced stop is triggered, indoor unit stops and Operation/Stop operation by a
* When forced stop function is used with forming a remote controller group, connect the
• Selection method of functions
"Operation/Stop" mode or "Emergency stop" mode, "Forced stop" mode can be selected
with function setting of indoor unit.
K1
K2
K3
Input device 1
Input device 2
NOTE :
When connected to multiple indoor units directly, it will cause breakdown.
DIP switch [SET2 SW2]
Input signal type
OFF (Factory setting)
Edge
ON
Pulse
Connector
Input signal
OFF → ON
Ch1 of CNA01 or CNA02
ON → OFF
Connector
Input signal
OFF → ON
Ch1
CNA01 or CNA02
OFF → ON
Ch2
Connector
Input signal
OFF → ON
Ch1 of CNA01 or CNA02
ON → OFF
Connector
Input signal
Ch1
OFF → ON
CNA01 or CNA02
Ch2
OFF → ON
Connector
Input signal
OFF → ON
Ch1 of CNA01 or CNA02
ON → OFF
Connector
Input signal
Ch1
OFF → ON
CNA01 or CNA02
Ch2
OFF → ON
remote controller is restricted.
same equipment to each indoor unit within the group.
P.C.B
K4
CNA02
P.C.B
K5
CNA02
P.C.B
K6
CNA02
K1 - K6: Relay
(Device for DC Current)
Edge
Pulse
The width of pulse must be
longer than 200 msec.
Command
Operation
Stop
Command
Operation
Stop
Command
Emergency stop
Normal
Command
Emergency stop
Normal
Command
Forced stop
Normal
Command
Forced stop
Normal
En-8
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