North Star M157595BE Owner's Manual page 48

Inspect electrodes
Maintenance & Repair
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.
4) Reset the spacing as shown below in Figure 21.
1/8"
7/16"
Figure 20
48
Heating chamber
Nuts
Burner
Electrodes
1/16"
Figure 21