Buderus 500-24S Installation And Maintenance Instructions Manual page 38

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Commissioning
2.1.4 Checking the gas type
Ensure that the boiler is set up to run on the gas type avail-
able. If this is not the case, then the boiler must not be put
into operation.
V Check the gas type with your gas supplier and com-
pare this to the boiler's gas type as registered on the
identfication tag ( table 5).
It is possible to change the boiler to another gas type
( table 4). This accessory can be ordered from your
supplier.
2.1.5 Measuring the gas-supply pressure
(flow pressure)
There are two ways to measure the gas-supply pressure:
– measuring the standing gas-supply pressure (boiler not
in operation);
– measuring the working gas-supply pressure (boiler
operating at full power).
NOTE
The difference between the standing and
working pressure may never be greater than
5 mbar. If the difference between the two is
greater than 5 mbar then the pressure loss in
the gas pipe is too great.
Measuring the standing gas-supply pressure
V Take the boiler out of service by pressing the mains
switch ( fig. 55, item 1) to "0".
V Close the gas shut off valve (
V Set the pressure gauge to "0".
V Loosen the gas test nipple screw two turns.
V Attach a tube from the pressure gauge to the gas test
nipple (the lower one,
V Slowly open the gas shut off valve (
V Measure the standing gas-supply pressure.
V Pull off the tube from the gas test nipple.
V Tighten the gas testing nipple screw.
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fig. 56, item 1).
fig. 57, item 2).
fig. 56, item 2).
Buderus 500-24S - Subject to modifications resulting from technical improvements
Type of gas Factory settings of gas burners
Natural gas When delivered ready for operation and
H set to Wobbe index 14.1 kWh/m
(referred to 15 °C, 1013 mbar), appli-
cable for Wobbe index range 11.3 to
15.2 kWh/m
indicating label:
Category setting: 2H G 20_20 mbar
LPG After adaptation by a CORGI regis-
tered installer, the unit can be run on
LPG. Inscription on gas-type indicating
label:
Category setting: 3P G 31_37 mbar
Tab. 4 Gas-supply types
Type of gas
Natural gas H (G20)
LPG
Tab. 5 Gas injector diameter
1 2
Fig. 55 DBA front
3
. Inscription on gas-type
Buderus 500-24S
Gas injectors ∅
Venturi
[mm] tubes
4.45 Standard
3.45 Standard
7215 3100-56.1TD
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