NGW 300 / LGW 300 / GBW 300
6 Functional tests
601
6
Function tests
6.1
General information
This section decribes the tests on heaters in both their
installed and dismounted states to prove that they are
operating properly.
CAUTION
Heaters should not be operated in closed spaces such as
garages or workshops without an exhaust system.
Due to the danger of fire, do not switch on the heater if the
burner head is dismantled.
6.2
Combustion test
6.2.1 Test of CO
2
content
The CO
2
content in the exhaust gas must be measured:
–
as part of a function test
–
if there are irregularities in combustion
–
after the burner has been repaired
–
after the gas pressure regulator has been replaced
–
when refitting the delayed-action solenoid in the NGW
300 heater
–
when retrofitting NGW 300 and LGW 300 heaters with
an adjustable nozzle
–
for the operation of the NGW 300 heater with CNG
(natural gas) whose methane content is below 95 %
by volume
–
after the installation of a replacement burner
PLEASE NOTE
The CO
2
values for the NGW 300 replacement burner are
set at the factory for utilisation with the delayed-action
solenoid.
The CO
2
-content must be in the following range:
The NGW 300 heater and
the GBW 300 heater in the
NGW 300 version
8.5 to 10.5 % by volume
The LGW 300 heater and
the GBW 300 heater in the
LGW 300 version
10.0 to 12.0 % by volume
PLEASE NOTE
In heaters that have not yet been equipped with a gas
intake nozzle, no adjustment of the CO
2
-setting is
possible.
These heaters should be retrofitted with the adjustable
gas inlet nozzle, in order to set the CO
2
value correctly.
For heaters which are already equipped with the
adjustable gas inlet nozzle the CO
2
content can be set at
the setting screw (Fig.. 601).
The following tool is needed for this:
•
NGW 300
a 6 mm Allen key
•
LGW 300
a 4 mm Allen key
Fig. 601 Setting the CO
2
-content
Setting screw
CO
2
PLEASE NOTE
When setting the CO
2
, turn the setting screw carefully,
as even a slight turn will have a strong effect on the CO
2
-
value.
