4. System component
DATA U3
CONTROLLER Cntr- 44
In a multi air conditioner system that is a free plan direct-expansion type, a connector for inputting and outputting signals to/
the outside is fitted as standard on the control board of the indoor, outdoor, and water-source units. Use this when you
want each unit to input/output signals individually. (Note: When ther are many control units, it is recommended that you use
MELANS.This would enable you to save on labor.) In order to have an input output signal from each connector, you must
have a dedicated adapter (sold separately) and a relay circuit (on-site arrangements).
Note : See next page for actual examples of use.
Category
Application
Input
Method of disabling cool and heat operation (thermo
o
(water-source unit).
ff) by input from the outside to the outdoor unit
Output
Method of receiving a signal from the outdoor unit
(water-source unit) to the outside.
Can be used as a device that displays the oper-
ation state.
Can be used as an interlocked control with ex-
ternal equipment.
Types of control that uses connectors for the outdoor unit / water-source unit input output signal
(connection for each type of option).
Types of control that uses connectors for the indoor unit input output signal (connection for each type of option)
Function
Connector
Category Application Function
Connector
Input
(Note 2,3)
Method of ON/OFF control by turning on and off switches or con-
tacts from an outside to each indoor unit group.
Can be used as a timer adapter (Note 1)
Can be used as a "forget to switch off prevention" or "forced stop".
Distant/local
switching (note 1)
ON/OFF (level)
CN32
Method of ON/OFF control by inverting start/stop using external
pulse (a-contact) for each indoor unit group.
ON/OFF (pulse) CN51
Output
Method of sending signals to outside for each indoor unit group.
It can be used as a device to display operation states.
It can be used as an interlocked control with the external equip-
ment.
Operation state
Error state
Error state or
frost prevention
output (note 8)
Operation ON
signal (note 9)
Operation mode
(heat) state
Operation mode
(cool, dry) state
Thermo ON
(fan) state
CN52
CN51
Comp ON/OFF
You can switch the operation mode between cooling
and heating by input from the outside to the outdoor
unit (water-source unit).
System
changeover
The lo
Forces the heat source unit to stop operation by
receiving contact signals from the pump interlock
circuit
w noise operation of the indoor unit can be
commenced by the external input to the outdoor
unit (water-source unit).
(The night mode can be adapted only under
f or heating)
Night mode
Pump Interlock
signal input
(level)
Compressor is
run state
CN3D
CN51
CN3D
CN3S
CN3D
CN51
TB8
TB8
TB8
TB8
Y, WY R2, WR2
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