Setting The Gas Pressure Switch; 20/25-Mbar Version; 300-Mbar Version; Attaching The Label - DeDietrich DTG 320 Eco.NOx Series Manual

4 Setting the gas pressure switch

20/25-mbar version

300-mbar version

5 Attaching the label

Affix the label which indicates for which type of gas the boiler is fitted
and set.
01/10/07 - 94858180 - 8358-4140fF Adapting to another gas - DTG 320 Eco.NOx - DTG 330 Eco.NOx
The minimum gas pressure switch on the safety valve is set in the
factory to a value of 12.5 mbar, which corresponds to the setting for
natural gas.
To operate on propane, set the start-up pressure to 20 mbar.
If there is a drop in the gas supply pressure, the minimum pressure
switch shuts down the boiler.
I Minimum gas pressure switch: 150 mbar
J Maximum gas pressure switch: 50 mbar
K Reset button - Maximum gas pressure switch
The gas line on the 300-mbar version of the boiler is fitted with 2 gas
pressure switches.
• The minimum pressure switch monitors the pressure upstream
(supply pressure).
It is set in such a way that the boiler is shut down whenever the
supply pressure falls to a minimum which cannot be used by the
burner (factory setting: 150 mbar).
• The maximum pressure switch monitors the pressure
downstream (injector pressure)
It is set in such a way that the boiler is shut down whenever the
pressure is too high (factory setting: 50 mbar).
These pressure switches are fitted to the 300-mbar gas multiblock
valve and are electrically connected in series.
The maximum gas pressure switch is reset manually.
If the manifold pressure exceeds the set value of 50 mbar
(abnormal increase in mains pressure, fracture of a gas
pressure regulator, etc.), the maximum pressure switch shuts
down the supply of electricity to the safety control box and is
locked out. To restart the heater, press the safety thermostat
reset button and repeat the starting operations.
5