North Star 1574210, Owner'S Manual, Page: 27 / 64

27
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.
4) Observe the “Shuttle Assembly” and internal
portion of “Body” for obstructions, hard water
deposits and any other foreign debris. Remove
the foreign debris with light scraping or
compressed air. If no additional cleaning is
required continue to Step 7. If additional
cleaning is required continue to step 5.
5) Remove the “Body” from the plastic “Enclosure”
and soak the “Body” in CLR or similar solution
to dislodge excess buildup. The screws (QTY 5)
in the “Enclosure” are TORX T10.
Swivel Fitting
Cap Fitting
Shuttle Assembly
(Bottom View)
Magnet
Shuttle
Assembly
(Side View)
Internal
Sections