Measuring The Co 2 Content - Viessmann Vitocrossal CRU 800 Service Instructions For Contractors

Commissioning, inspection, maintenance
Checking the static pressure and supply pressure
Supply pressure Measure
(flow pressure) nat-
ural gas E and LL
17 to 25 mbar Start the boiler.
1.7 to 2.5 kPa
> 25 mbar Install a separate gas pressure governor with zero off upstream of the boiler system. Set
> 2.5 kPa it to 20 mbar (2 kPa) (nominal supply pressure).
Note
The nominal supply pressure must be set subject to regional conditions, see type plate of
the burner.
Measuring the CO
Programming unit on the burner control unit
Status Service
R
S
Fig. 7
01. Check control cables:
Connection and kink-free routing
■
■ Fixing and firm seating of the connecting points
02. Open the gas shut-off valve.
03. Activate emissions test mode.
Vitotronic control unit operating instructions
04. On the burner control unit, hold down S+ simulta-
neously for longer than 2 s.
"P" is displayed under "Status" (controlled stop).
■
The current modulation level in % is shown
■
under "Service".
16
content
2
Adjusting screws on the gas train
Fig. 8
05. To measure the CO2, set the upper and lower
heating output in turn:
■
■
06. Measure the CO
For permissible CO
Note
At the lower heating output, the CO
always be lower than at the upper heating output.
(cont.)
B A
Upper heating output:
≙
Press until "100" ( 100 %) is shown under
"Service".
Lower heating output:
≙
Press until "0" ( 0 %) is shown under "Serv-
ice".
content at the flue pipe.
2
content, see the table.
2
content must
2