North Star M157594AF.1 Owner's Manual page 45

Inspect electrodes
Maintenance & Repair
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:
1) Wear protective clothing,
goggles, and gloves.
2) Disconnect high-pressure
hose on inlet side of coil
and thermostat on outlet
side of coil.
3) Remove the lid and
insulation lid from the
heating chamber and hoist
the coil out. Be careful, the
coil weighs 125 lbs.
4) Clean the coil.
5) Reassemble the coil and lids
to the machine. Make sure
the white insulation remains
in place.
6) Reattach high-pressure hose
and thermostat and make
sure all fittings are tight
before using the machine.
Inspect electrodes yearly and make adjustments as needed.
1) Remove the 4 nuts that attach the burner to the heating chamber. You
do not have to disconnect the fuel lines or the electric cords.
2) Pull the burner out from underneath the heat exchanger.
3) Clean off carbon deposits, which may have accumulated on the tips of
the electrodes.
Lid
Insulation
lid
Heating
Coil
Heating
Chamber
Figure 20
45
Figure 19
Heating chamber
Nuts
Burner