External Control (Remote Display)/Control Of Input Signal - Mitsubishi Heavy Industries SRK20ZD-S1 Technical Manual

(15) External control (remote display)/control of input signal

Make sure to connect the wired remote control unit. Control of input signal is not available without the wired remote control unit.
(a) External control (remote display) output
Following output connectors (CNT) are provided on the printed 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
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) If the factory settings (Jumper wire J1 EXTERNAL INPUT on the PCB) are set, or "LEVEL INPUT" is selected in the wired
remote control's indoor unit settings.
Input signal to CnT OFF → ON
1)
Input signal to CnT ON → OFF
2)
CnT Input
A Unit
B Unit
(ii) When Jumper wire J1 on the PCB of indoor unit is cut at the field or "PULSE INPUT" is selected in the wired remote
control's indoor unit settings.
Input signal to CnT becomes valid at OFF → ON only and the motion of air conditioner [ON/OFF] is inverted.
CnT Input
A Unit
B Unit
ON
OFF
ON
OFF
*ON
ON
ON
OFF
OFF
ON
OFF
ON
OFF
Air conditioner ON
Air conditioner OFF
ON
OFF
OFF
*ON
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
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Note (1) The ON with the * mark indicates an
ON operation using the remote control
unit switch, etc.