North Star M157310AC.1, Owner'S Manual

Page: 42 / 56

Maintenance and Repair
42
3) Unthread the removable outlet fitting with the swivel still attached from
the flow switch assembly
4) Remove the shuttle
5) Clean the inside of the brass flow switch body and the shuttle with water
and a soft brush
6) Insert the shuttle into the brass flow switch in the orientation shown
Note: Aligning the male tabs on the shuttle to the female guides inside
the brass flow switch body can be difficult since the shuttle is magnetic
7) Thread the removable outlet fitting with the swivel still attached into the
flow switch assembly
8) Thread the brass flow switch body onto the incoming water flow source
(hose or tee) depending on the model
9) Reconnect the swivel fitting to the inlet of the coil
Inspect heating coil
and desoot as
needed Inspect and desoot coil annually .
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.
If soot has built up on the exterior of the coil tubing, clean as follows:
Shuttle Alignment
Shuttle
male tabs
Shuttle
Swivel
Fitting
Removable
Outlet
Fitting
Flow Switch
Assembly
Brass Flow
Switch Body
female guides
Figure 20