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Commissioning
2.1.4
Checking the gas type
It is very important that the gas type to which the boiler will be
connected corresponds to the gas type the boiler is equipped
with. If this is not the case, then the boiler must not be put into
operation.
Check the gas type with your gas supplier and compare
this to the boiler's gas type as registered on the identfica-
tion tag (see table 5).
It is possible to change the boiler to another gas type (see
table 4). This accessory can be ordered from your supplier.
2.1.5
Adjusting the DHW flow regulator
CAUTION
It is important to adjust the flow of hot water,
due to the resistance of the pipes in the instal-
lation and the differences in water pressure.
The DHW flow regulator is located on the bottom frame of the
boiler (see fig. 48).
Adjust the DHW flow regulator (fig. 48) to the desired
setting:
– To increase the flow of hot water:
turn valve clockwise "+".
– To reduce the flow of hot water:
turn valve counterclockwise "-".
Factory setting:
10 l/min of 48 °C, assuming that the DHW cold is 10 °C and
there is a pre-pressure of 2.5 bar.
2.1.6
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.
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for Buderus 500 - 24/C and 500 - 28/C • 02/2005
Type of gas
Factory settings of gas burners
When delivered ready for operation and set
to Wobbe index 14.1 kWh/m
15 °C, 1013 mbar), applicable for Wobbe
Natural gas H
index range 11.3 to 15.2 kWh/m
Inscription on gas-type indicating label:
Category setting: G 20 - 2E_20 mbar
After adaptation by a CORGI registered
installer, the unit can be run on propane.
LPG P
Inscription on gas-type indicating label:
3P G 31_37 mbar
table 4
Gas-supply types
Gas injectors
Type of gas
24/C
Buderus 500
Natural gas H
4.45
(G20)
Propane P
3.45
(LPG)
table 5
Gas injector diameter
fig. 48 DHW flow regulator
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
2
3
(referred to
3
.
∅
[mm]
Venturi
tubes
28/C
4.45
Standard
3.45
Standard
35
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