Technical data

Vitorond 200, VD2 Series 320 to 1080 Installation
5285 429 - 03
34
Burner
Burner Installation (continued)
Fully modulating burner
When the Vitorond 200, VD2 is operated with a fully
modulating burner, the minimum boiler water temperature
is as follows:
Oil-fired burner. . . . . . . . . . . . . . . . . . . .140°F (60°C)
Gas-fired burner. . . . . . . . . . . . . . . . . .. 149°F (65°C)
Return water temperature elevation must be adjusted
to a minimum temperature of 129°F (54°C).
Model Flue gas resistance
mbar “w.c.
VD2-320 0.50 0.20
VD2-380 0.90 0.35
VD2-440 1.30 0.51
VD2-500 1.70 0.67
VD2-560 1.90 0.75
VD2-630 2.10 0.83
VD2-700 2.80 1.10
VD2-780 3.90 1.54
VD2-860 4.90 1.93
VD2-950 4.50 1.77
VD2-1080 6.72 2.70
Model Input Input Min.1-stage
input
Min.1-stage
input
Oil
MBH
Gas
MBH
Oil
MBH
Gas
MBH
VD2-320 1255 1300 753 780
VD2-380 1490 1544 895 926
VD2-440 1726 1787 1036 1072
VD2-500 1961 2031 1177 1219
VD2-560 2196 2275 1318 1365
VD2-630 2471 2559 1483 1535
VD2-700 1745 2843 1647 1706
VD2-780 3059 3168 1835 1901
VD2-860 3373 3493 2024 2096
VD2-950 3727 3860 2236 2316
VD2-1080 4236 4387 2542 2632
Weishaupt burners / Riello burners
A Vitorond 200, VD2 boiler with a high-performance gas
burner installed can achieve a combustion efficiency
of up to 85%, and up to 88% if equipped with a #2 oil
burner as follows:
Gas-fired
10% volume CO
2
, 280°F (138°C) net stack temperature,
CO in ppm < 50
Oil-fired
13% volume CO
2
, 300°F (149°C) net stack temperature,
smoke spot 0 - 1 (on the Bacharach Scale)
The maximum input published for each boiler size must
not be exceeded.
Vitorond 200, VD2 with Viessmann Vitotronic controls
To further protect the Vitorond 200, VD2 from dew-point
corrosion, the following minimum inputs on a 2-stage
burner must be adjusted for the first stage when the
boiler is used in conjunction with a Viessmann Vitotronic
controls, and when operating with modulating boiler
water temperatures.
See separate instructions supplied
with the burner.
Under partial load conditions, a minimum flue gas
temperature must be met. How high that minimum
flue gas temperature must be depends largely on the
configuration of the chimney insulation and height
of the chimney; however, it should be a minimum
of 248°F (120°C).
Two-stage burner
With a two-stage burner, when the boiler water
temperature falls below the minimum 140ºF (60ºC),
the burner automatically switches to the second stage
(full input) to protect the boiler from the effects of
dew-point condensation, i.e. condensation/corrosion.
In order to provide this protection, the burner must not
be limited to first stage operation during the summer
months.
System Preparation (continued)
See separate instructions supplied with the
burner. The maximum input published for each
boiler size must not be exceeded.