![](/images/new-backgrounds/1010201/1020165x1.webp)
Reference
Typical Gas Train Layout with Modulating Valve (Pilot Ignition)
Burner Differential |
| Pilot | Pilot |
| Solenoid | ||
| Regulator | ||
Pressure Sensor |
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| Pilot Gas Pressure |
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| Test Port |
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High Gas | Modulating | Low Gas | Manual Pilot |
Valve | Pressure Switch | ||
Pressure Switch |
| (optional) |
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(optional) |
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Burner Gas | Burner Manual | Safety | Regulator | |||
Pressure | Valves |
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Test Port |
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Typical Gas Train Layout with Modulating Regulator (Pilot Ignition)
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| Pilot | Pilot |
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| Solenoid | |
|
| Regulator | |
Burner Differential |
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| |
Pilot Gas Pressure |
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| |
Pressure Sensor | Test Port |
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| Modulating/Regulator | Low Gas |
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| Pressure Switch | Manual Pilot | |
High Gas | Valve | (optional) | |
Pressure Switch |
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(optional) |
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Burner Gas | Burner Manual | Safety |
Pressure | Valves | |
Test Port |
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Model VSU
®