16
For 246 and 311 kW rated heating output only
A
C
D
B
Fig. 8
1.
Open the gas shut-off valve.
2.
Check the position of the rotary damper with the
burner in idle mode. Rotary damper windows
B
must be fully opened. Scale ring
D
on the air
damper servomotor must be set to "0", relative to
marking
C
.
3.
Check control cable
A
between gas train and
Venturi mixing pipe:
■
Connection and kink-free routing
■
Fixing
4.
Start the burner.
5.
Check the position of the rotary damper during the
start-up phase. Rotary damper windows
B
must
be almost closed for approx. 5 s. During this time,
scale ring
D
must be at the following settings:
Rated heating output in
kW
Rotary damper set-
ting
246
35°
311
35°
Checking the CO
2
content
Preparing the test
Status Service
S
R
Fig. 9
1.
Open the gas shut-off valve.
2.
Start the burner with emissions test mode enabled
(
"Test mode"
in control unit menu).
Vitotronic operating instructions
3.
Hold down
S
and longer than 2 s.
The display will then show the following:
■
Status: "P" (= controlled stop)
■
Service: Modulation level in % ("100" = 100 % =
upper heating output, "0" = 0 % = lower heating
output)
Commissioning, inspection, maintenance
Checking the rotary damper setting
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