Siemens RVD250-A, S55370-C125

Multifunctional heating controller for use in district heating substations and district heating plants with LPB and M-bus communication. Suited for one heating circuit with d.h.w. heating in instantaneous systems or with storage tank. 28 programmed plant types. Operating voltage AC 230 V.

Key features:

• Optimized for low return temperatures in district heating networks.

• Display of time of day‚ time program‚ setpoints‚ actual values‚ limitations‚ errors‚ etc.

• Optional remote operation via room unit

• 2 independent switching programs each with 3 occupancy times per day

• Yearly clock with automatic summer- / wintertime changeover

• Power and / or volumetric flow limitation in combination with heat meter

• Pump and valve protection

• Automatic monitoring of sensors with display of alarm

• Locking function for district heat parameters

• Optional suppression of hydraulic creep

• Frost protection function

• DRT limitation for the reduction of peak loads and of idle heat

• Maximum limitation of the return temperature on the primary side

• Minimum and maximum limitation of the flow temperature

• Optimum start / stop control of the heating system

• Automatic ECO function

• Legionella function

• Forced charging function for plant with storage tank

• Cooling down protection for the primary supply lines

• Solar d.h.w. heating

• D.h.w. heating with electric immersion heater

• Refill function

• Selectable heating period

Plant-specific:

• Precontrol internal and interconnected

• 1 mixing or pump heating circuit

• D.h.w. heating with selectable priority:

• Instantaneous systems

• Storage charging system

• Storage system with integrated heat exchanger

• Circulating pump, 2 charging pump

HS Code: 90321020

Coo: Switzerland