Weishaupt WG20 1-C Z-LN Series - Setting Gas Pressure Switch

Installation and operating instruction
Gas burner WG20…/1-C Z-LN
7 Commissioning
83054602 1/2020-01 La
46-96
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 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
5
0
30
2
0
90
11
0
1
3
0
1
5
0
1
2
Set (optional) high gas pressure switch
Set high gas pressure switch to 1.3×PGas full load (flow pressure at full load).