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Output
Function
Application
External output of operation
Operation
status signal for each coolant
status
circuit of indoor unit.
External output of fault signal
Fault
for each coolant circuit of
indoor unit.
[Fig. 7.5.1] (P.6)
<A> Model 250
<B> Model 500
A With-voltage input
C Start/Stop
E Common
G Relay contact output
I Operation status
K External I/O board
M Connector connection
A With-voltage input
Pulse input of start or stop
External
DC12 - 24 V
power supply
Input current (per contact)
Approximately 10 mA (DC12 V)
Remote Start/Stop switch
SW12
* Toggles ON/OFF each time switch is pressed (pulse input).
D No-voltage input
Remote Start/Stop switch
SW11
* Toggles ON/OFF each time switch is pressed (pulse input).
Contact: Minimum applicable load DC 12 V 1 mA
Contact rating DC 12 V 0.1 A and over
G Relay contact output
Display
DC30 V 1 A or less
power supply
AC220 - 240 V 1 A
L1, L3
Operation status
L2, L4
Fault status
XA ~ XE
Relay (allowable current 10 mA - 1 A)
•
Settings for indoor unit
Check that the following settings have been entered when using external input.
1) Control board DIP SW3 - 8 ON
(Set to ON prior to shipment from factory. External input disabled when set to
OFF.)
2) Address board DIP SW1 - 10 OFF
(Set to OFF prior to shipment from factory. External input disabled when set to
ON.)
3) Normal/Check switch inside unit control box set to Normal.
(Set to Normal prior to shipment from factory. External input disabled when set
to Check.)
8. Remote Controller Operation Problems and Solutions
Phenomenon
Not appear "'" mark on MA remote
controller display (MA dose not re-
ceive the power supply)
Not disappear of "HO"
Appear "'" mark but hot operated.
Operates or stops the unit without
push the remo-con button
14
Signal specifications
Relay "a" contact output
DC30 V or AC220 - 240 V
Contact rated current: 1 A
Contact minimum load: 10 mA
B External power supply
D No-voltage input
F Start/Stop
H Display power supply
J Fault
L Terminal block connection
N Wiring distance 100 m or less.
Cause
• Power failure of indoor unit
• Power failure of outdoor unit
• Over connection of MA remote controller (Max. 2 remo-con)
• Transmission line connects to TB7 of outdoor unit (Should be
connected to TB3)
• MA remo-con connects to TB5 of indoor unit (Should be con-
nected to TB15)
• MA remo-con line is shorted or broken.
• Power supply line or transmission line is shorted or broken.
• Blow out fuse on indoor control board.
• Power failure of outdoor unit
• MA setting is "Sub"
Main setting: SW1 ON
Sub setting: SW1 OFF
• MA remo-con connects to TB5 of indoor unit (Should be con-
nected to TB15)
• Transmission line connects to TB7 of outdoor unit (Should be
connected to TB3)
• Transmission line is shorted, broken or connection failure.
• Blow out fuse on indoor control board.
• Timer operation with remo-con
• Operation with external I/O controller
Wiring Method
1. Check the indoor unit settings (Refer to 7. Electrical Wiring Diagram).
2. When using the external output function, connect the signal lines to the exter-
nal output terminal (TB22) of the unit as appropriate for the application. Peel
the cover of wires and connect to the terminals.
3. When using the external input function, connect the signal lines to the external
input terminal (TB21 or TB23) of the unit as appropriate for the application.
Peel the cover of wires and connect to the terminals.
Caution:
1. TB21 is a dedicated terminal for no-voltage contact input. Connection to
a voltage may result in a fault in the indoor control board.
2. TB23 is a dedicated terminal for voltage contact input. Connect only after
checking polarity. Failure to do so may result in a fault.
3. When using AC220 - 240 V, ensure that input wiring and communication
cables are installed separately from output wiring.
4. External signal lines may be extended up to 100 m.
[Fig. 7.5.2] (P.6)
A Site wiring
B Fix low-voltage system (DC30 V or less) wiring with clamps and pass to unit via
transmission line wiring holes.*1
C Fix high-voltage system (AC220 - 240 V) wiring with clamps and pass to unit via
power supply wiring holes.*2
D To CN51 on control board (air-conditioner internal wiring).
E model 500 only
*1 Installation together with AC220 - 240 V high-voltage system wiring may result
in mis-operation of the unit due to noise.
*2 Installation together with DC30 V (or less) low-voltage system wiring may re-
sult in mis-operation of the unit due to noise.
<Arrangement parts on site>
External output functions
Product name
Model and specifications
Use plastic-sheathed cord or cable.
External
Wiring type: CV, CVS, or equivalent.
output
Wiring size: Twisted 0.5 mm
signal lines
Single wire: ø0.65 mm - ø1.2 mm
Display
No-voltage "a" contacts
lamps etc.
External input functions
Product name
Model and specifications
Use plastic-sheathed cord or cable.
External
Wiring type: CV, CVS, or equivalent.
input signal
Wiring size: Twisted 0.5 mm
lines
Single wire: ø0.65 mm - ø1.2 mm
Switches
No-voltage contacts
The power will not be supplied to MA remo-con after finishing the
initial mode correctly.
"HO" is flashing during the initial mode. (Max. 20sec.)
The units cannot operate if transmission line is incorrect.
2
- 1.25 mm
2
DC30 V 1 A or less
AC220 - 240 V 1 A or less
2
2
- 1.25 mm
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