Viessmann CT3U, Инструкция по эксплуатации

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13
CO
2
testing at the lower heating output
C
D
E
F
Fig. 8
1. Press "-"
D
until the service display has decre-
mented to "0" (lower heating output).
2. Note
The CO
2
content for all natural gases must be
between 7.5 and 10.5 %.
Check the CO
2
content at the flue pipe. The CO
2
content must be 0.3 % lower in partial load than it
is in full load.
Rated heating
output in kW Permissible CO
2
content in
%
400 8.3
±
0.3
500 8.3
±
0.3
630 8.3
±
0.3
B A
Fig. 9
3. If the CO
2
content needs adjusting:
■ Undo cover
B
.
■
Turn adjusting screw
A
in small increments
(Torx 40) until the CO
2
content lies within the
specified range:
–
Turning clockwise
→
CO
2
content rises
–
Turning anti-clockwise
→
CO
2
content falls
4. Record the actual value in the report (on
page 54).
!
Please note
The CO
2
content must always be lower in
partial load than it is in full load.
Rechecking the values
Regulate to the upper and lower heating output
again using the programming unit in the burner
control unit. If the values do not match the permis-
sible CO
2
content according to the table on
page 12, repeat the steps for the upper and lower
heating output.
5. Press "S"
E
and "-"
D
simultaneously. The
burner continues at the original modulation level at
which status "d" (= control stop) was initiated. The
burner then returns to operating mode.
Checking the CO content
Commissioning, inspection, maintenance
Checking the CO
2
content
(cont.)
5783 337 GB