RWF50 Siemens Temperature Controller

The RWF50 Siemens Temperature Controller is used primarily for the control of temperature or pressure in boilers. Whether used independently or as part of an entire Siemens combustion control system, RWF5 units optimize temperature or pressure control on modulating burners.

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  • RWF50.20A9 is a universal controller with 3-position output, thermal shock protection
  • Same as RWF50.20A9 with analog output
  • Same as RWF50.30A9 with Modbus, setpoint changeover, setpoint shifting, outdoor air reset and limit comparator
  • Same as RWF55.50A9 plus Profibus-DP interface


Input Voltage 110-240 VAC (+10/-15%), 48-63 Hz
Power Consumption Max 20 VA
Operating Temperature -20 to 50 °C, -4 to 122 °F
Enclosure Rating IP66 keypad display, rel. humidity <95% (non-condensing)
Aux. DC Power Output 24 VDC, 30 mA
Output Relay Contact Rating 24-240 VAC, 2 A max
Analog Output Rating 0-10 VDC (500 Ω load min), 0-20 mA or 4-20 mA (500 Ω load max)
Modbus RTU Port Configurable baud rate (4800, 9600, 19200, 38400)

Address 1-254

Size 1/8 DIN, 122 mm mounting depth
Data Storage Non-volatile EEPROM
Approvals UL, CSA, CE