Installation and operating instruction
Gas burner WG40…/1-A ZM-LN
7 Commissioning
83300002 1/2019-02 La
64-128
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 O
2
content in the flue gas increases to above 7 %,
the flame stability considerably worsens,
the CO content increases,
the gas pressure reaches 12 mbar,
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 12 mbar.
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.
70
50
30
20
90
110
130
150
1
2
Set (optional) high gas pressure switch
Depending on the burner application, optional equipment may be required for op-
timum operation [ch. 12.1].
Set high gas pressure switch to 1.3 × P
Gas full load
(flow pressure at full load).
