Viessmann Vitocrossal CRU 1000, Инструкции по обслуживанию для подрядчиков

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16
Supply pressure
(flow pressure) nat-
ural gas E and LL Measure
17 to 25 mbar
1.7 to 2.5 kPa Start the boiler.
> 25 mbar
> 2.5 kPa Install a separate gas pressure governor with zero off upstream of the boiler system. Set
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
2
content
Programming unit on the burner control unit
Status Service
S
R
Fig. 7
Adjusting screws on the gas train
A B
Fig. 8
0 1. Check control cables:
■ Connection and kink-free routing
■ Fixing and firm seating of the connecting points
0 2. Open the gas shut-off valve.
0 3. Activate emissions test mode.
Vitotronic control unit operating instructions
0 4. 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".
0 5. To measure the CO2, set the upper and lower
heating output in turn:
■ Upper heating output:
Press until "100" (
≙
100 %) is shown under
"Service".
■ Lower heating output:
Press until "0" (
≙
0 %) is shown under "Serv-
ice".
0 6. Measure the CO
2
content at the flue pipe.
For permissible CO
2
content, see the table.
Note
At the lower heating output, the CO
2
content must
always be lower than at the upper heating output.
Commissioning, inspection, maintenance
Checking the static pressure and supply pressure
(cont.)
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