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Technical Data
Natural gas
Burner Model
N200
Boiler
VB2-18
MBH
Input
kW
3
ft
/h
Flow Rate
3
m
/h
Model
MVD-LE 205/6
Gas Valve
"w.c.
Manifold
Pressure
3
1 ft
T in seconds
3
0.01 m
Combustion
Head Setting
Air Gate
Setting
The above specifications are for 0-2000 ft. above sea level.
Burner test results
The indicated values for manifold and
air gate settings are the result of
production line testing under ideal
conditions.
Final burner adjustment to suit local
field conditions is necessary for safe
operation.
IMPORTANT
Observe the stated minimum and
maximum supply gas pressures.
Exposing the burner gas train to supply
pressures other than the stated values
can cause unsafe conditions.
Viessmann strongly recommends the
installation of an approved type CO
detector in the vicinity of any gas
burning equipment. Observe national
and/or local code requirements. If in
doubt consult your local gas company.
N200
N200
VB2-22
VB2-33
90
116
26
34
90
116
2.55
3.29
MVD-LE 205/6
1.6
2.1
40.00
31.03
14.1
10.86
0.3
2.0
2.0
2.0
Verification of results
The burner adjustment values indicated
serve as a starting point only.
Combustion results must be field
verified using properly calibrated
Bacharach or equivalent instruments.
Each burner is certified for one input
only. Do not overfire or underfire
burner.
Technical data
Fuel
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Average
heating value
. . . . . . . . . . . . . . . . . . .
N200
VB2-40
146
42
146
4.13
5.24
MVD-LE 205/6
MVD-LE 205/6
2.0
1.5
24.65
19.45
8.70
6.86
2.0
2.8
3.5
The burner settings above do not
guarantee safe operation. Burner
settings serve to help provide smooth
operation at initial start-up.
Do not overfire or underfire burner.
Factory settings to be verified or
changed by qualified heating
contractor, depending on field
measured combustion results.
Specifications
Inlet gas pressure
Draft regulator
VB2-18 to -40
VB2-50 to -63
Overfire draft
Max. breeching draft
INPUT = 3600/T x 1000
where
natural gas
T
3
1000 MBH/ft
INPUT = (3600 x 0.01 x 1000 x 35.31)/T
where
T
gas
Appendix
N400
N400
VB2-50
VB2-63
185
238
54
69
185
238
6.74
MVD-LE 207/6
MVD-LE 207/6
1.2
15.12
5.34
3.5
1.0
2.5
CAUTION
CAUTION
min. 4.0" w.c.
. . . . . . . . . . .
max. 10.5" w.c.
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
+0.01" w.c.
. . . . . . . . . . . . . . . . . . . . .
-0.02" w.c.
. . . . . . . . . .
3
= TIME (sec.) for 1 ft
= TIME (sec.) for 0.01 m
300
88
300
8.5
1.1
12.00
4.23
5.0
2.8
MG1 6"
MG1 7"
natural gas
3
natural
15
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