NorthStar M157117I.1 Owner's Manual page 43

Cleaning Flow
Switch
Maintenance & Repair
Inspect and clean the flow switch as needed
Mineral build-up and/or debris within the flow switch can occur and may affect
burner operation if not periodically cleaned. Mineral build-up and/or debris can
stop the movement of the shuttle inside the flow switch body. Shuttle movement is
important because the burner will not fire if the shuttle does not move. The shuttle
movement actuates a switch inside the flow switch housing which allows the
burner to fire during spray mode.
1) Disconnect the swivel fitting from elbow to the inlet of the coil
2) Remove the "Cap" fitting from the flow switch.
3) Slide out the "Shuttle Assembly". If the magnet in the shuttle assembly is
damaged or missing, replace the entire flow switch assembly. To order a
replacement flow switch assembly, call Northstar Product Support at 1-
800-270-0810.
FIG03527
Cap Fitting
43
Swivel Fitting