Installation and operating instruction
Gas burner WG10…/0-D ZM-LN
7 Commissioning
83300902 1/2019-02 La
57-112
7.3 Set pressure switches
7.3.1 Set gas pressure switch
Low gas pressure switch/valve proving gas pressure switch
The switch point must be checked and if necessary adjusted during commission-
ing.
Connect pressure measuring device to test point 1 of the low gas pressure
switch.
Start burner and drive to full load.
Slowly close gas isolating valve until either:
the O2 content in the flue gas increases to above 7%,
the flame stability considerably worsens,
the CO content increases,
the gas pressure reaches 12mbar,
or the gas flow pressure drops to 50 %.
Determine gas pressure.
Slowly open gas isolating valve.
Set the pressure determined as switch point at the setting cam 2, minimum
value 12mbar.
Check switch point
Restart the burner.
Slowly close gas isolating valve.
If the low gas program starts, the gas pressure switch has been set correctly.
If a lockout occurs or if the combustion reaches a critical condition, the low gas
pressure switch reacts too late.
If lockout occurs:
Increase switch point at setting cam 2.
Slowly open gas isolating valve.
Re-check switch point.
Set (optional) high gas pressure switch
Depending on the burner application, optional equipment may be required for op-
timum operation.
Set high gas pressure switch to 1.3×PGas full load (flow pressure at full load).
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