User Guide

50
Service Manual NeoTherm 80 - NeoTherm 285
The ame sensor is a single-rod system, and is mounted
in the front cover of the heat exchanger. Over time, this
sensor can become tarnished or coated. (This will hap-
pen more quickly if the NT unit has been operating often
at a low ring rate.) The ame sensor has a protective
coating.
Important! Do not use sandpaper, steel wool, or emery
board to clean the ame sensor. These materials will
clean the sensor, but they will also remove the protective
coating. The sensor will work, but only for a short time.
Adjustment Procedure:
1. Shut off the 120V power supply to the unit.
2. Turn off all manual gas valves connecting the unit to
the main gas supply line.
3. Remove the front door of the unit to gain access to
the ame sensor electrode.
4. The end of the ame rod should be at least 1/4”
away from the burner. See Fig. B32-2.
Cleaning or Replacement Procedure:
1. Shut off the 120V power supply to the unit.
2. Turn off all manual gas valves connecting the unit to
the main gas supply line.
3. Remove the front door of the unit to gain access to
the ame sensor electrode.
4. The best way to clean the ame sensor is to use a
dollar bill, as shown in Fig. B33-1. The paper used
in the bill is just abrasive enough to clean the sensor
correctly, without removing the protective coating.
5. If you need to replace the part, remove the ame
sensor wire from the electrode.
6. Remove the two bolts fastening the electrode to the
burner door. Remove the old ame sensor.
7. Install a new assembly by reversing the instructions
listed above. The end of the ame rod should be
at least 1/4” away from the burner. See Fig. B32-2.
Replace the ame sensor gasket if it is damaged.
Fig. B33-1 - Correct way to clean the ame sensor
Flame Sensor
B33