Gas/Air Ratio Control - DeDietrich C230 ECO-A 120 Installation, Operating And Service Manual

6 Gas-side connections
6.3

Gas/air ratio control

24
Gas system pressure checks

The boiler main gas cock shutoff valve and piping must be
isolated from any gas piping pressure testing in excess of 0.5 psi
(35 mbar).

The boiler main gas cock shutoff valve and piping must be
isolated by closing the main gas cock shutoff valve during gas
piping pressure testing less than 0.5 psi (35 mbar).

The boiler main gas piping and gas train must be leak tested prior
to placing the boiler in operation.
The boiler has a zero governor gas valve. This gas valve maintains
the ratio between the gas and air quantities in the burner at a constant
level under variable loads. This ensures clean and reliable combustion
and high efficiency across the entire load range. There is no need to
vent the gas valve.
C230 ECO-A