Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 1040

FDC-HKXR
(12) Multiple Units Control-Simultaneous Control of 16 unit with one remote controller
(a) Function
Multiple units (even of outdoor different systems, 16 units maximum) can be simultaneously controlled by using a remote
control switch (a special order item). The remote control switch is used to set the "operation mode", and all the unit can be
operated and stopped at intervals of 0.5 to 1 second in the order of unit number. Thermostat and protective functions of each
unit functions independently.
Note(1) When part of the group gets out of order (the protective device operates), the relevant unit comes to an abnormal stop, but other normal units keep operating.
(b) Wiring Procedures
(i) Lay power cable of each unit and signal wire as usual. (Remove the remote control switches from all units excluding only one unit.)
Lay wiring for the remote controller separately from power cable and wires for all other electrical equipment.
(ii) Arrange the terminal block (X, Y, Z) of the remote controller as shown next page for the simultaneous control, and lay
cross over in each indoor unit.
Outdoor
unit
Indoor
unit
No.1
Notes (1) The overall length of the signal wire shall be less than 1000m.
(2) The length of remote control signal wire and crossover for remote controller between room shall be less than 600m.
(13) External control (remote display)/control of input signal
(a) External control (remote display) output
Following output connectors (CNT) are provided on the control circuit board of indoor unit.
(i) Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation.
(ii) Heating output: Power to engage DC 12V relay (provided by the customer) is outputted during the heating operation.
(iii) Compressor ON output: Power to engage DC 12V relay (provided by the customer) is outputted while the compressor is
operating.
(iv) Error output: When any error occurs, the power to engage DC 12V relay (provided by the customer) is outputted.
(b) Control of input signal
(Make sure to connect the standard remote control unit. Control of input signal is not available without the standard remote control
unit.) Control of input signal (switch input, timer input) connectors (CNT) are provided on the control circuit board of the
indoor unit. However, when the operation of air conditioner is under the Center Mode, the remote control by CnT is invalid.
(i) At shipping from factory (SW
1) Input signal to CnT OFF → ON [Edge input] Air conditioner ON
2) Input signal to CnT ON → OFF [Edge input] Air conditioner OFF
CnT Input
A Unit
B Unit
1038
Signal
wire
Signal wire
Indoor Indoor
unit unit
No.2 No.3
(2)
Remote control
signal wire
on PCB OFF)
5-1
ON
OFF
ON
OFF
ON
ON
(1)
(1)
Indoor
unit
No.16
Remote control
signal wire
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
Outdoor
unit
(2)