Viessmann VITOROND 200 Technical Data Manual page 10

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.
VD2-125 and VD2-160
VD2-195
VD2-230 and VD2-270
Recommended Flow Rates
Boiler model
*1
20°F ∆t
40°F ∆t
11°C ∆t
22°C ∆t
*1
∆t = temperature difference
10
VD2- 125
GPM 43
GPM 21
ltrs/s 2.7
ltrs/s 1.3
mbar
"W.C.
400 1000
320 800
280 700
240 600
200 500
400
160
350
140
120 300
100 250
80
200
60 150
100
40
32 80
70
28
24 60
20 50
16 40
35
14
30
12
10 25
8 20
6 15
4 10
3.2 8
2 5
3 4 5
13 18 22
160 195
55 67
27 33
3.4 4.2
1.7 2.1
A
B
C
8 10 15 20 25 30
35 44 66 88 110 132
Flow rate
230
79
39
5.0
2.5
VITOROND 200, VD2
3
m /h
USG/min
270
92
46
5.8
2.9