Checking The Co2 Content - Viessmann Vitocrossal 300 Service Instructions Manual

Commissioning, inspection, maintenance

Checking the CO2 content

Preparing the test
C
D
E
F
Fig. 5
CO test at the upper heating output
2
C
D
E
F
Fig. 6
B A
Fig. 7
12
1. Open the gas shut-off valve.
2. Start the burner.
3. Press "S" and "-"
E D
Display then shows the following:
C
Status: "d" (= control stop)
■
■ Service: Modulation level in % ("00" = 100 % =
upper heating output, "0" = 0 % = lower heating
output)
1. Press "+" until the service display has incre-
F
mented to "00" (= 100 %).
2. Note
The CO content for all natural gases must be
2
between 7.5 and 10.5 %.
Check the CO content at the flue pipe.
2
Rated heating Permissible CO
output in kW
%
400 8.6
500 8.6
630 8.6
3. If the CO content needs adjusting:
2
■ Remove cap B .
■ Turn setting screw
A
Allen key) until the CO
specified range:
Turning clockwise
–
CO content falls
→
2
– Turning anti-clockwise
CO content rises
→
2
4. Record the actual value in the report (on page
54).
!
Please note
The CO content must always be lower in
2
partial load than it is in full load.
simultaneously.
content in
2
0.3
±
0.3
±
0.3
±
in small increments (3 mm
content lies within the
2