Technical data

Vitorond 200, VD2A Technical Data
5354 787 - 01
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Technical Data
Waterside Flow
The Vitorond 200 boiler is designed for closed loop,
forced circulation, hot water heating systems only.
The recommended water flow rate through the Vitorond
200 is based on a temperature difference of between
20° F and 40° F (11° C and 22° C) (see table below).
When a balancing valve is used for proper balancing
and water flow through the boiler, the valve should be
installed 5 pipe diameters from any fittings and 10 pipe
diameters from circulation pumps to allow for laminar
flow.
The consulting engineer or contractor should review
the system design if more balancing valves are required
to properly balance the system.
Viessmann can supply TA (Victaulic) balancing valves
upon request. The balancing should be carried out by
a certified balancing firm prior to boiler start-up. Please
contact Viessmann for your closest certified balancing
firm.
Recommended Flow Rates
Boiler model VD2A- 125 160 195 230 270
20° F ∆t GPM 43 55 67 79 92
40° F ∆t GPM 21 27 33 39 46
11° C ∆t L/s 2.7 3.4 4.2 5.0 5.8
22° C ∆t L/s 1.3 1.7 2.1 2.5 2.9
∆t = temperature difference
Legend
A VD2A-125, VD2A-160
B VD2A-195
C VD2A-230 and VD2A-270
Pressure Drop
Flow Rate