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3 Technical description
3
.3.1 Air supply
Air damper
The air damper actuator controls the amount of combustion air for optimum combustion.
When the burner is in stand-by position, the air damper closes automatically.
Blower fan
The blower fan is driven by the burner motor. It supplies air through the air inlet via air
damper to the mixing head.
Air pressure switch
In case of failed air supply, the air pressure switch initiates a safety lockout.
Mixing head
The air gap between the flame tube and the diffuser is adjusted depending on the burner
maximum firing rate.
3.3.2 Gas supply
Gas train
Weishaupt gas and dual fuel burners are equipped as standard with dual safety gas
valves, in single or double valve body configuration.
* This gas train configuration is for reference only. Actual gas train configuration may
vary depending on applicable codes/ regulations
1 Gas shut off valve
The gas shut off valves open and shut off the gas supply to the burner and/or pilot.
2 Gas pressure regulator SKP25
The SKP25 is a motorized valve actuator with integrated pressure regulator. It opens and
shuts the V2 valve according to the burner startup or shutdown sequence and it also
regulates the gas pressure to the burner corresponding to the burner’s firing rate.
3 Dual gas valves
The dual gas valves open and shut the gas supply to the burner and are controlled by the
combustion manager.
4 Gas butterfly valve
The butterfly valve controls the amount of gas corresponding to the burner firing rate.
The combustion manager controls the gas butterfly valve via dedicated stepping motor.
5 High gas pressure switch
A high gas pressure switch is connected to the safety interlock causing a lockout
whenever the gas pressure is higher than the set point.
Installation and Operating Instructions
G
as burner WG20.../1-C ZM-LN (W-FM 25)
83055116 • 1/2016-05
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