The Siemens RDG400 Zone VAV Controller is a single zone controller with automatic heat/cool change-over function.

• VAV control of a single zone
• Temperature controlled
• 24V AC
• Duct sensor included

Designed for the following types of systems:

• Single-duct system 
• Single-duct system with electric heater
• Single-duct system and radiator / floor heating
• Single-duct system with heating / cooling coil
• Room temperature control via built-in temperature sensor or external room temperature / return air temperature sensor.  External remote sensor included
• Automatic or manual changeover between heating and cooling mode
• Selection of applications via DIP switches
• Selection of operating mode with operating mode button on the thermostat
• Display of current room temperature or setpoint in °C and/or °F
• Minimum and maximum setpoint limitation
• Button lock (automatic or manual)
• 3 multifunctional inputs, freely selectable for:
  • Operating mode switchover contact (keycard, window contact, etc.)
  • Changeover sensor for automatic heating / cooling mode
  • External room temperature or return air temperature
  • Dewpoint sensor
  • Electric heater enable
  • Faults 
• Minimum and maximum limitation of air flow signal DC 0…10 V
• Floor heating temperature limit
• Reload factory settings for commissioning and control parameters
• Wizard function to select working temperature unit °C or °F