Vitorond 200, VD2 Series 320 to 1080 Technical Data
5285 428 - 03
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Product Information
Technical Data
(continued)
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
VD2-
320
380
440
500
560
630
700
780
860
950
1080
20° F
∆
t
GPM
109
130
150
171
191
215
239
266
293
324
369
40° F
∆
t
GPM
55
65
75
85
96
108
119
133
147
162
184
11° C
∆
t
L/sec.
6.9
8.2
9.5
10.8
12.1
13.6
15.1
16.8
18.5
20
23.2
22° C
∆
t
L/sec.
3.4
4.1
4.7
5.4
6.0
6.8
7.5
8.4
.9.3
10.2
11.6
∆
t = temperature difference
Legend
A
VD2-320, VD2-380 and VD2-440
B
VD2-500, VD2-560 and VD2-630
C
VD2-700, VD2-780 and VD2-860
D
VD2-950 and VD2-1080
Note:
This boiler does not require a flow switch.
Pressure Drop
Flow Rate
