RVD250-A

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

• Operating voltage: AC 230 V
• Frequency: 50 Hz
• Power consumption: 5.5 VA
• Communication: LPB (interconnected controller) , M-bus (slave)
• Analog input, signal: DC 0...10 V, LG-Ni1000 , NTC 575
• Digital inputs, number: 1
• Digital inputs: Pulse transmitter , Status contact
• Digital outputs: 1 × PWM, DC 12 V, 2 × AC 230 V 2(2) A, 8 × AC 230 V 1(1) A
• Dimensions (W x H x D): 144 x 96 x 109 mm
• Warranty: 24 Months

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