Do not attempt the burner fuel pump system pressure adjustment with the
heater running. Attempting to perform this procedure with heater running may
result in severe injury to personnel.
27. Adjust the burner fuel pump pressure adjustment screw (23) as follows: If the system
pressure monitored in the previous step was less than 180 psi, rotate the adjustment screw
clockwise to increase system pressure. If the system pressure monitored in the previous step
was greater than 180 psi, rotate the adjustment screw counterclockwise to decrease system
pressure. Turn the adjustment screw no more than 1/4-turn clockwise or counterclockwise in
each adjustment attempt.
28. After making the necessary adjustment, place the main battery shutdown switch in the ON
position and close all access panels except the burner access panel. Start the LCFH and
monitor the system pressure as detailed in step 25. Ensure that system pressure is 180 psi. If
it is not, perform steps 25 through 28 as necessary until a system pressure of 180 psi is