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Reference – Greenheck DG / DGX with Direct Spark (470652) User Manual

Page 36

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Direct Spark Ignition Make-Up Air

36

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Typical Gas Train Layout with Direct Spark Ignition

Reference

This is a typical gas train. The gas train in your unit may be different.

Direct Spark Ignition Gas Train

Burner Differential

Pressure Sensor

(Airflow Switch)

Modulating

Valve

to Burner

Combination Shut-Off

Valve/Regulator

Low Gas Pressure

Switch (optional)

Low Gas Pressure

Test Port

Gas Connection

High Gas Pressure

Test Port

Burner Manual

Shut-Off Valve