514
Thermo G
5 Troubleshooting
5.5.10 Heat protection cover inspection
Check the heat protection cover visually. For that remove
the burner head (see 8.4).
NOTE:
Cracks and small outbreaks in heat protection cover are
permitted and do not constitute a impairment.
The area of the heat protection cover in which outbreaks
are permitted is gray marked in Fig. 506.
5.5.11 Gas pressure regulator inspection
ATTENTION:
The gas pressure regulator must not be disas-
sembled.
NOTE:
The check is performed when the gas pressure regulator
is installed.
5.5.11.1 General tests
–
Check the plug pins for corrosion and tight fit.
–
Was the gas pressure regulator replaced after 4 years
of operation?
–
When the heater is switched off, no gas may escape
through the outlet to the heater, even when solenoids
are open.
–
The supply line connection must be checked for im-
permeability.
5.5.11.2 Examination of the solenoid valves at the
gas pressure regulator
During heater operation disconnect plug connection to the
gas pressure regulator.
The combustion must stop immediately. If the combustion
Fig. 504 Distance of the ignition electrodes
to the flame pipe
Fig. 505 Distance between ignition electrodes
Fig. 506 Outbreaks at the heat protection cover
Heat protection
cover
Area of the heat protection cover
are permitted
in which outbreaks
