Viessmann Vitocrossal 300 CA3 2.5 Installation And Service Instructions Manual page 94

Service
Measuring CO
Boiler models
2.5 and 3.0
3.5 to 6.0
94
Content
(continued)
2
Burner models
1.25 MMBTU
1.5 MMBTU
1.5 MMBTU
2.0 MMBTU
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Measuring CO at lower heating output
2
1. Press button
dropped down to "0" (lower heating output).
2. Measure CO
2
IMPORTANT
CO content in partial load must always be at least 0.6%
2
lower than in full load.
3. If the CO content must be changed:
2
Unscrew cover cap B. Turn adjustment screw A in
small increments (Torx 40) until CO
indicated level:
Turning clockwise → CO
Turning counter-clockwise → CO
4. Record measurement reading in record (on page 222).
Check measurement readings again.
Start up the upper and lower heating output via the
burner control unit. If the values do not correspond
with the permissible CO
the steps for the upper and lower heating output must
be repeated.
5. Press buttons S E and
than 2 sec. Burner changes to operating mode.
Permissable CO
Natural Gas
8.3 +0.1/-0.2%
8.3 +0.1/-0.2%
8.3 +0.1/-0.2%
8.3 +0.1/-0.2%
D until the service indicator has
content at the flue gas pipe.
content is at the
2
content increases,
2
content decreases.
2
contents as per the tables,
2
D simultaneously for longer
content
2
Liquid Propane Gas
10.3 +0.0/- .2%
10.3 +0.0/- .2%
10.3 +0.0/- .2%
9.9 +0.0/- .2%