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Model VSU Make-Up Air
®
Burner Differential
Pressure Sensor
(Airflow Switch)
Burner Manual
Shut-Off Valve
High Gas
Pressure
Test Port
High Gas
Pressure
Switch
(Optional)
Modulating
Valve
To Burner
Combination
Shut-Off Valve/
Regulator
Low Gas
Pressure
Test Port
Low Gas
Pressure Switch
(Optional)
Gas
Connection
Typical Gas Train Layout with Direct Spark Ignition
This is a typical gas train. The gas train in your unit may be different.
Reference