Thermo Pride OPA Installation And Service Manual page 55

All installations and services must be performed by qualified service personnel.
6. Open the inspection cover on the upper mounting plate.
7. Turn on the electrical power to start the burner. If the burner does not start,
immediately reset the manual overload switch on the motor (if so equipped)
and the safety switch of the burner primary control. Bleed air from the fuel oil
line as soon as the burner motor starts rotating. To bleed the fuel pump,
attach a clear plastic hose over the vent plug, refer to Figure 13. Loosen the
plug and catch the expelled oil in an empty container. Tighten the plug when
all the trapped air appears to be purged. If the burner stops during bleeding,
wait three to five minutes for the control safety switch to cool. Then manually
reset the switch. Continue bleeding the line until the air is completely
removed.
8. Follow the previous Initial Burner Operation procedures.
Figure 13: Location of Oil Pump Vent Plug
54