Initial start-up
2
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
27
Subject to modifications resulting from technical improvements!
Boulter Buderus Ltd. • http://www.boulter-boilers.com
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.
z
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
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).
Type of gas
Factory settings of gas burners
Natural gas
E
(includes
natural gas
H
)
When delivered ready for operation and set to
Wobbe index 14.1 kWh/m
3
(referred to 15 °C,
1013 mbar), applicable for Wobbe index range
11.3* to 15.2 kWh/m
3
.
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
Gas nozzles
∅
[mm]
Venturi
tubes
600 - 28C
Natural gas
E
(G20)
(includes natural gas
H
)
4.45
Standard
Venturi tubes
Propane
P
(G31)
3.45
Standard
Venturi tubes
Table 8
Gas-nozzle diameter
fig. 40 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.
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.
