RVD250-A – Bộ điều khiển tưới 28CT Siemens

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

• S55370-C129
• QAE2121-015
• S55720-S514
• S55235-V145