Chapter 2 — Burner Operation and Control
Part No. 750-184 2-7
10.Leakage Connection: The body of the gas valve has a plugged opening
that is used whenever it is necessary to conduct a test for possible
leakage across the closed valve.
E. CONTROLS COMMON TO OIL-FIRED BOILERS
(INCLUDING COMBINATION)
See Figure 2-10. The following items are applicable to all oil fired
or gas and oil fired boilers.
1. Oil Drawer Switch: Opens the limit circuit if oil drawer burner gun
is not latched in the forward position required for burning oil.
2. Atomizing Air Proving Switch: Pressure-actuated switch whose
contacts are closed when sufficient atomizing air pressure from
Figure 2-9 Gas Train
Shut Off Valve
Low Gas Pressure Switch
Main Gas Valve
Gas Valve w/POC
High Gas Pressure Switch
Pilot Shut Off Cock
Pilot Pressure Regulator
Pressure Gauge
Gas Pilot Valve
MAIN GAS TRAIN
PILOT GAS TRAIN
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