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Initial start-up
2.1.5
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 may 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 8).
It is possible to change the boiler to another gas type (see
table 7). This accessory can be ordered from your supplier.
2.1.6
Adjusting the hot-water 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.
Adjust the hot-water flow regulator (fig. 40) to the desired
setting:
– To increase the flow of hot water:
turn valve towards "+".
– To reduce the flow of hot water:
turn valve towards "-".
Factory setting:
8 l/min of 60 °C, assuming that the DHW cold is 10 °C.
2.1.7
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 in the gas pipe
is too great.
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
Type of gas
Factory settings of gas burners
Natural gas E
When delivered ready for operation and set to
Wobbe index 14.1 kWh/m
(includes
1013 mbar), applicable for Wobbe index range
H
natural gas
)
11.3* to 15.2 kWh/m
Inscription on gas-type indicating label:
Category setting: G 20 - 2E_20 mbar
Propane P
After adaptation by a CORGI registered installer,
the unit can be run on propane. Inscription on
gas-type indicating label: 3P G 31_30-50 mbar
Table 7
Gas-supply types
Type of gas
Natural gas E (G20)
(includes natural gas H)
Propane P (G31)
Table 8
Gas-nozzle diameter
fig. 40 Hot-water flow regulator
Boulter Buderus Ltd. • http://www.boulter-boilers.com
3
(referred to 15 °C,
3
.
Gas nozzles
Venturi
∅ [mm]
tubes
600 - 28C
4.45
Standard
Venturi tubes
3.45
Standard
Venturi tubes
2
27
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