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Vitorond 200, VD2A Series Installation
New Casting Design and Therm-Control Functionality
VD2 cast iron section
VD2A cast iron section
Redesigned Return Water Distribution System
Boiler supply
Return water
distribution tube
Boiler
return
Therm-Control
sensor
A specific, matching boiler control is part of the standard
equipment of the Vitorond 200, VD2A.
Boiler protection is assured by the following:
- Therm-Control
- Control of a shunt pump
- Flow rate reduction in the heating circuits
- Constant return temperature control
The cast iron mid-sections were re-designed to increase
the heat exchanger surface area and water volume, and
the number of cast iron sections was reduced by one
section.
Together with the redesigned return water distribution
system and the Therm-Control low-temperature protection
logic, this eliminates the need for a minimum return water
temperature.
The larger water volume and increased width of the flue
passages also ensure even heating of the water and
reduced burner cycling.
A new tongue-and-groove system with silicone sealant
replaces the fiber-rope seal between sections used with
the VD2 Series.
System return water enters the cast iron sections of the
VD2A boiler via a return water distribution tube now
located at the top of the cast iron block (see illustration).
Heated supply water flows at the bottom of the cast iron
block towards the rear section and upward to the supply
connection. The return water temperature is elevated
when passing through the rear cast iron section where
the supply water flows upward to the boiler supply
connection.
The pre-heated return water is then distributed to the
cast iron sections through two upward-pointing openings
in the distribution tube at each section. The size of the
opening is proportional to the amount of heat input of
each cast iron section. In each section the return water
flows downward and mixes with heated water. Once fully
heated, the supply water flows through the bottom of
the cast iron block up the rear section and out the boiler
supply to the system.
The even temperature distribution ensured by this design
reduces the thermal stress on the heat exchanger and,
in conjunction with the Vitotronic Therm-Control logic,
prevents the formation of flue gas condensate at all return
water temperatures, eliminating the need for a shunt
pump or return temperature elevation provided by a Low
Temperature Protection (LTP) Package.
General Information
9
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