External Control (Remote Display)/Control Of Input Signal - Mitsubishi Electric SRK19CIS Technical Manual

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

(1) External control (remote display) output
Following output connectors (CnT) are provided on the printed circuit board of indoor unit.
• Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation.
• Heating output: Power to engage DC 12V relay (provided by the customer) is outputted during the heating operation.
• Compressor OPERATION output: Power to engage DC 12V relay (provided by the customer) is outputted while the com-
• MALFUNCTION output: When any error occurs, the power to engage DC 12V relay (provided by the customer) is outputted.
(2) Control of input signal
Control of input signal (switch input, timer input) connectors (CnT) are provided on the control circuit board of indoor unit.
(a) Level input
If the factory settings (Jumper wire J1 EXTERNAL INPUT on the PCB of indoor unit) are set.
1) Input signal to CnT OFF → ON
2) Input signal to CnT ON → OFF
CnT Input
Unit
(CASE A)
Unit
(CASE B)
(b) Pulse input
When Jumper wire J1 on the PCB of indoor unit is cut at the field.
Input signal to CnT becomes valid at OFF → ON only and the motion of air conditioner [ON/OFF] is inverted.
CnT Input
Unit
(CASE A)
Unit
(CASE B)
pressor is operating.
Air conditioner ON
Air conditioner OFF
ON
OFF
ON
OFF
*ON
ON
ON
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
*ON
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
20
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Note (1) The ON with the * mark indicates an
ON operation using the remote control
unit switch, etc.