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12.15  External Room Thermostat Control (Optional) 
Purpose: 
1  Better room temperature control to fulfill different temperature request by external room thermostat. 
Recommended external room thermostat: 
 
Maker Characteristic 
Siemen (REV200)  Touch panel 
Siemen (RAA20)  Analog 
 
Connection of external room thermostat: 
Wire Connection and thermo characteristic of Siemen REV200: 
 
Setting  L/L1 (H)  Heat Thermo  L/L2 (C)  Cool Thermo 
Set Temp < Actual Temp  Open Circuit OFF Short Circuit  ON 
Set Temp > Actual Temp  Short Circuit  ON  Open Circuit  OFF 
 
Cooling
Heating
Siemen REV200
Connect only heating line for heating only model. And connect both
heating and cooling line for heat + cool model.
Indoor Unit
9 L (label)
10
11
12
L1 (label)
L2 (label)
9 : Terminal Bord No.
 
 
 
Wire Connection and thermo characteristic of Siemen RAA20: 
 
Setting  L/Y1 (H) Heat Thermo L/Y2 (C) Cool Thermo 
Set Temp < Actual Temp  Open Circuit OFF Short Circuit  ON 
Set Temp > Actual Temp  Short Circuit  ON  Open Circuit  OFF 
 
Cooling
Heating
Siemen RAA20
Connect only heating line for heating only model. And connect both
heating and cooling line for heat + cool model.
Indoor Unit
9 L (label)
10
11
12
Y1 (label)
Y2 (label)
9 : Terminal Bord No.
 
 
Control Content: 
  External room thermostat control activate only when remote thermostat connection select YES by Indoor control 
panel. 
  When indoor running heat mode, refer thermo On/Off from heating line feedback. And when indoor running cool 
mode, refer thermo On/Off from cooling line feedback. 
  Heat pump Off immediately when receive thermo off feedback.