Webasto GBW 300 Installation instructions manual - page 52
GBW 300
Fuel supply
49
11
Fuel supply
IMPORTANT
The heaters may only be operated using the fuel specified on the model
plate.
NGW 300 only:
Fuel: CNG (natural gas) with a minimum methane content of 95 %. If the
methane content is less than this the heater’s gas jet must be adjusted
by Webasto trained personnel. The max. oil content of the gas is 70 ppm.
The fuel must be taken from the tank or from the immediate vicinity of
the tank. The fuel must not be taken from the filler line or from places at
which oil and condensate may collect. The fuel extractor is to be
designed such that as little oil and condensate can get into the heater
supply line as possible (outlet at the top). If the gas quality is poor
(contaminated), shorter servicing intervals (oil drainage every quarter)
or regulator replacement intervals (4 years) may be required.
Delayed-action solenoid valve:
Install the delayed-action solenoid valve in the gas intake line between
the pressure regulator and the heater as close as possible to the heater.
The valve must be installed using the fastening thread provided (bracket
of adequate strength). The possible installation positions and the flow
direction must be observed.
LGW 300 only:
IMPORTANT
The fuel must be taken in its gas phase.
11.1. Fuel lines
The fuel lines on the high pressure side must be made of stainless steel.
The couplings have double cutting rings (for example Swagelok).
All parts of the high pressure side must be approved pursuant to VdTÜV,
information sheet 757 ECE R110 and ECE R67.
Only the genuine Webasto hose may be used for the fuel line on the low
pressure side between the pressure regulator and the heater. When you
install the hose you must ensure that it is an adequate distance (min. 25 mm)
from the external casing of the heater or it must be shielded from the heat.
Fuel hoses must not be kinked or twisted and must be secured with clips
approx. every 250 mm.
The following must be observed for the installation of fuel lines:
– The lines must be protected from the effects of high temperatures.
IMPORTANT
The external casing of the heater may reach a temperature of
approx. 220 °C if it overheats.
– The lines must be protected from stone damage.
Fig. 23: Delayed-action solenoid valve
Installation positions