A.O. Smith fps50, FPSE50, FPS40, FPS 75 manual Pilot Problems, shooting cont

FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK

FPSE 40 and 50 SERVICE AND OPERATION cant. FPD 40 and 50 SERVICE AND OPERATION cant.

Trouble-

shooting cont.

PILOT PROBLEMS

The following are possible causes of pilot problems:

1.An open E.C.O. (high limit) will not allow the heater to relight. (See page 49)

2.Incorrect pilot gas pressure: it should be 3.5" w.c. for natural gas. It should be 10" w.c. for propane gas.

3.Incorrect excessive equivalent foot length on vents can cause pilot outages.

4.Incorrect pilot position: The pilot should engulf the tip of the flame sensor 3/8'1to 1/2".

5.A leak in pilot tube will cause candling