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Siemens Building Technologies Basic documentation RVD240 CE1P2384en
HVAC Products 1 Summary 27.05.2004
1 Summary
1.1 Brief description and key features
• The RVD240 is a multifunctional heating controller for controlling the flow tempera-
ture of 2 heating circuits and for controlling d.h.w. heating
• The controller’s field of use covers exclusively plants with district heat connections. It
has been designed specifically for small to medium-size residential and non-
residential buildings with 2 heating circuits
• The RVD240 has 4 heating circuit types and 11 d.h.w. plant types preprogrammed.
By combining the different plants, it is possible to configure 14 plant types. The con-
figuration activates all functions and settings required for the respective type of plant
• In terms of control, the RVD240 is designed as a flow temperature controller. Control
can be effected in one of 5 different ways:
− Only weather-compensated control of the heating circuit flow temperatures
− Weather- and room-compensated control of the heating circuit flow temperatures
− Only room-compensated control of the heating circuit flow temperatures
− Demand-dependent control of the common heating circuit flow temperature
• In terms of d.h.w. control, the RVD240 is designed for the following types of applica-
tions:
− D.h.w. heating with coil type storage tanks
− D.h.w. heating with stratification storage tanks
− Direct d.h.w. heating via heat exchanger
− Common or separate heat exchangers for the heating circuit and d.h.w. heating
− Two-stage separation of the d.h.w. from district heating
• The RVD240 is suited for the control of 2-port and 3-port valves and pumps, includ-
ing variable speed pumps
• For the direct adjustment of the nominal room temperature setpoint, there is a setting
knob available. All the other parameters are set digitally based on the operating line
principle
• Key design features: Operating voltage AC 230 V, CE conformity, overall dimensions
to DIN 43700 (96 × 144 mm)
1.2 Type summary
The RVD240 is a compact controller and requires no accessories such as inserts, plug-
in modules, etc. The controller is supplied complete with base.
1.3 Equipment combinations
1.3.1 Suitable sensors
• For the flow temperatures:
Suitable are all types of temperature sensors that use a sensing element LG-
Ni 1000. The following types are presently available:
− Strap-on temperature sensor QAD22
− Immersion temperature sensors QAE2...
For the control of the d.h.w. flow temperature (B3), it is also possible to use commer-
cially available sensors with Pt 500 sensing elements
• For the return temperatures:
The following types of temperature sensors are presently available:
− Strap-on temperature sensor QAD22
− Immersion temperature sensors QAE2...
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