16
2.
Check the supply pressure (flow pressure); see the
following table.
Note
Set supply pressure (flow pressure):
■
Natural gas 18 to 50 mbar (1.8 to 5 kPa)
■
LPG 42.5 to 57.5 mbar (4.25 to 5.75 kPa)
Nominal supply pressure:
■
Natural gas 20 mbar (2 kPa)
■
LPG 50 mbar (5 kPa)
The nominal supply pressure can differ from these
values subject to country; see type plate.
The gas pressure switch on the gas train is set to
10 mbar (1 kPa). For operation with LPG, set the
gas pressure switch to 20 mbar (2 kPa).
3.
Record the actual value in the report (on
page 56).
4.
Close the gas shut-off valve.
5.
Remove pressure gauge. Close test connector
A
.
Supply pressure (flow pressure)
Measure
Natural gas
LPG
< 15 mbar
< 1.5 kPa
< 20 mbar
< 2 kPa
Never adjust any settings. Notify your gas supply utility or
LPG supplier.
15 to 18 mbar
1.5 to 1.8 kPa
20 to 42.5 mbar
2 to 4.25 kPa
Please note: the boiler may only be operated temporarily
with this setting (emergency mode).
Notify your gas supply utility or LPG supplier.
18 to 50 mbar
1.8 to 5 kPa
42.5 to 57.5 mbar
4.2 to 5.75 kPa
Start the boiler.
> 50 mbar
> 5 kPa
> 57.5 mbar
> 5.75 kPa
Install a separate gas pressure governor with zero off up-
stream of the boiler system. Set pressure to 20 mbar/2 kPa
for natural gas, or 50 mbar/5 kPa for LPG.
Checking the CO
2
content
Preparing the test
Status Service
S
R
Fig. 9
1.
Open the gas shut-off valve.
2.
Start the burner with emissions test mode enabled
(
"Test mode"
in control unit menu).
Vitotronic operating instructions
3.
Hold down buttons and
S
simultaneously for lon-
ger than 2 s.
The display will then show the following:
■
Status: "P" (= controlled stop)
■
Service: Modulation level in % ("100" = 100 % =
upper heating output, "0" = 0 % = lower heating
output)
Delivered condition, nominal CO
2
value, gas type
G20
Upper heating output: 9.0 % (-0.1/+0.3)
Lower heating output: CO
2
value of upper heating out-
put minus 0.7 % (-0/+0.4)
The specified CO
2
difference of at least 0.3 % must be
ensured. If the CO
2
difference between the lower and
upper heating output is smaller than this, the CO
2
value must be adjusted.
Commissioning, inspection, maintenance
Checking static pressure and supply pressure
(cont.)
5831036