Greenheck Fan VSU Make-Up Air Unit with Direct-Fired Gas Heater 470654 - Manual (Page 33)

33 Model VSU Make-Up Air
®
Burner Differential
Pressure Sensor
High Gas Pressure
Switch (optional)
Low Gas Pressure
Switch (optional)
Manual Pilot
Shut-Off Valve
Pilot Gas Pressure
Test Port
Pilot Solenoid
Pilot Regulator
Burner Gas
Pressure Test Port
Burner Manual
Shut-Off Valve
Modulating
Valve
Safety Shut-Off Valves Regulator
Airflow
Reference
Typical Gas Train Layout with Modulating Valve (Pilot Ignition)
Typical Gas Train Layout with Modulating Regulator (Pilot Ignition)
Burner Differential
Pressure Sensor
High Gas Pressure
Switch (optional)
Low Gas Pressure
Switch (optional)
Manual Pilot
Shut-Off Valve
Pilot Solenoid
Pilot Regulator
Burner Gas
Pressure Test Port
Burner Manual
Shut-Off Valve
Safety Shut-Off Valves
Pilot Gas Pressure
Test Port
Modulating/Regulator
Valve
Airflow