Hitachi RCI-1.0FSR Service Manual page 109

5 Optional functions
Indoor units input and output signals
Specifications for field-supplied room thermostat:
• Manufacturer or type: equivalent to YAMAKATE R7031P005, R7031Q005.
• Contactor charge: 12 Vdc
• Difference of over 1.5 degrees.
• Do not use a mercury thermostat.
• The remote control must remain connected to the unit. When the power supply is reconnected, start the unit by
pressing the on button. The compressor will then run under the control of the field-supplied thermostat. All other
functions are controlled in the normal manner via the remote control.
Remote ON/OFF 1 (Level signal input)
On-screen display: 03.
This is an optional on/off signal that uses the signal levels ON and OFF. Connect the wiring and use the materials as
indicated in "5.1.1 Available ports". (Example: terminals 1 and 3 of CN3)
Indoor unit PCB
CN3
3
2
1
2
1
3P Connector
Control using the
?
N O T E
• When the unit is started using the remote ON/OFF switch, the fan speed depends on the mode stored in the remote control.
• The collection of signals during the first 10 seconds after connecting the power supply is not available due to component initialization.
Do not change the signal in this period.
• Operation priority is given to the remote on/off signal or to the remote control, whichever is transmitted last.
• If multiple indoor units are connected to the same transmission wiring for remote control switch, input the signal to any of these indoor
units. When the transmission wiring is not used in a multiple indoor unit system for simultaneous operation, input the signal to the
main indoor unit.
Remote ON/OFF 2 (pulse signal input)
Function 2: remote switching ON of the unit (pulse signal input)
On-screen display: 04.
This is an optional remote on/off signal that uses the pulse signal.
Connect the wiring and use the materials as indicated in
99 SMGB0137 rev.0 - 05/2021
X1
Remote ON/OFF is set to terminals 1 and 2 of CN3
CN3 signal
ON
(Terminal 1
OFF
and 2)
RCS
ON
OFF
Unit operation
"5.1.1 Available
SS3: Remote ON/OFF
SS3
X1
Control circuit
Press the RUN/
STOP switch
Time
ports". (Example: terminal 2 and 3 of CN3).
5
Power
supply