Hitachi RPI-0.8FSG1 Service Manual page 313

(3) Picking Up Heating Operation Signal (Except for RPK-FSGM Series)
This function is utilized to pick up the heating operation signal. The contact of RYa is closed when
heating operation signal is ON despite "Thermo-ON" or "Thermo-OFF". Connect the wires as shown
below.
(4) Picking Up "Thermo-ON" Signal during Heating Operation (Except for RPK-FSGM Series)
This function is utilized to pick up the heating "Thermo-ON" signal of compressor running to control a
circulator or a humidifier. Connect wires as shown below. The required parts are indicated in Table
4.3. The contact of RYa is closed when "THERMOSTAT" is ON during heating operation mode.
NOTE:
"Thermo-ON" indicates that one of the micro-computer control function "THERMOSTAT" is ON as a
thermostat.
CN8 Connector
CN8
(JST-XHP-3)
Picking Up Heating Operation Signal
(JST-XHP-3)
OPTIONAL FUNCTION
(4.1 Indoor Unit)
4-9