Inspect Heating Coil And Desoot As Needed - North Star M1574210J Owner's Manual

6) Rinse "Body"
7) When cleaning is complete reinstall the "Body"
into the "Enclosures", taking care not to cause
damage. Tighten the "Screws" into the body
until they are snug. Do not over-tighten the
screws.
8) Insert the "Shuttle Assembly" with the rounded
end first, into the body. Align with grooves.
Shuttle
(Male Tabs)
Rounded End First
9) Inspect the O-ring on the "Cap", if it is damaged,
replace the entire flow switch assembly.
a replacement flow switch assembly, call Northstar
Product Support at 1-800-270-0810. If the O-ring is
not damaged, re-install the "Cap" onto the "Body".
Torque the cap to 100lb-in.
Maintenance & Repair
TORX
T10
Screw
Enclosures
Body
Body
(female Guides)
To order
Cap Fitting;
Torque to
100lb-in
10) On the elbow on the inlet of the coil, remove
any remaining thread tape/sealant. Re-apply
new thread tape/sealant on the elbow. Re-
connect the swivel to the elbow. Hand-tighten
the swivel onto the elbow, and once snug, using
a wrench continue to tighten the swivel two
additional revolutions.

Inspect Heating Coil and Desoot as Needed

Most coils never require desooting. However, poor
grades of fuel oil or inadequate combustion air will
cause heavy soot build-up on the outside surface of the
heating coil tubing. These deposits will insulate the coil,
which then restricts air flow through the heat exchanger
and further aggravates the soot build-up. Be sure to
wipe the sight glass. See Fig06172 on next page.
If soot has built up on the exterior of the coil tubing,
clean as follows:
1) Wear Protective clothing, goggles, and gloves.
2) Disconnect Fuel line from outer cover.
Disconnect Flame sensor and High Tension
Leads from black box bolted to the guard on
side of Outer Wrap.
3) Remove (4) 5/16" Bolts from Outer Cover.
4) Remove Outer Cover set aside.
5) Remove (4) 5/16" bolts and nuts off the hold
down brackets on the Outer Wrap.
6) Remove all inlet and outlet fittings.
7) Remove the (2) 1-1/4" Jam nuts and the 3/8"
bolt underneath the base.
8) Lift off Outer Wrap, Inner Wrap and Inner Cover.
Set aside.
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