93
5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Service
Measuring CO
2
Content
Preparing for measurement
IMPORTANT
When adjusting a burner only this one burner may be in
operation. The other boiler unit burners must be at standstill.
Take measurement readings of burners one after the other.
CO
2
Test at the upper heating input
1. Press button
Y
F
until the service display
C
has
incremented to “100“(= 100%).
2. Check the CO
2
level at the flue pipe.
3. If the CO
2
level must be adjusted:
■
Remove cap
B
.
■
Turn adjusting screw
A
in small increments
(3 mm Allen key) until the CO
2
level falls within the
specified range:
- Turning clockwise
→
CO
2
level falls (less gas)
- Turning counter-clockwise
→
CO
2
level rises
(more
gas)
4. Record the actual value in the report (on page 222).
Checking the CO
2
level
Preparing the test
1. Open the gas shut-off valve.
2. Start the burner with the emissions test switch enabled
at the boiler control unit.
3. At the same time, press button
S
E
and button
B
D
and hold for longer than 2 seconds.
The display will then show the following:
■
Under Status
C
: “P“ (= relay test)
■
Under Service
C
: Modulation level in %
“100“ = 100% = upper heating input
“0“ = 0% = lower heating input
Boiler models
Burner models
Permissible CO
2
content
Natural Gas
Liquid Propane Gas
2.5 and 3.0
1.25 MMBTU
8.9 +0.3/-0.1%
11.0 +0.0/- .2%
1.5 MMBTU
8.9 +0.3/-0.1%
11.0 +0.0/- .2%
3.5 to 6.0
1.5 MMBTU
8.9 +0.3/-0.1%
11.0 +0.0/- .2%
2.0 MMBTU
8.9 +0.3/-0.1%
11.0 +0.0/- .2%
