Lochinvar EFW 85 Installation, Commissioning, User And Maintenance Instructions page 121

Burner
Check the burner surface to see if it has damages, signs of rust and/or cracks. When the burner surface is
damaged the burner must be replaced. The burner can be cleaned by using a soft (non-metallic) brush. The dust
can be removed with a vacuum cleaner or pressurized air.
Ignition / ionization electrode
When the complete burner is removed, it is very easy to check the ignition electrode. First check if the distances
between the electrodes and between the electrode and the burner are according to the figure below. When
these are not correct, try to bend the electrodes into the right position. Notice: the electrodes undergo high tem-
peratures, therefore the electrodes become hard and are difficult to bend. While bending used electrodes they
might break or burst. Check the electrode, after bending, for any tear/crack and signs of rust. When they are
damaged in any manner or rusty, replace the electrode. Also replace the electrode when there is a crack in the
ceramic insulation of the electrode. When the electrode is replaced, also the gasket must be replaced. The elec-
trode should be cleaned annually by lightly rubbing its surface with cleaning cloth. Emory cloth, sandpaper, and
any other abrasive material should never be used to clean the electrode.
Required tools: Phillips #2 screwdriver.
Point of view in next picture →
Burner door thermostat
Needed tool: Wrench 16 mm.
This thermostat is activated if the temperature of the burner door has
been too high. In this case, it has to be replaced (spare part).
Replacement:
- Disconnect the wiring and remove the thermostat.
- Tighten the burner door's thermostat with a torque of 2 Nm.
- Reconnect the wiring.
- Check the burner door insulation
Burner door gaskets
If any part of a gasket has discolored, changed texture, or has hardened, the rubber has cured and/or has dam-
ages, these gaskets must be replaced. Notice: only use the gaskets that are supplied by the water heater manu-
facturer.
Burner door gasket replacement:
- Remove the old gasket
- Place a new gasket in its groove.
- Respect the mounting direction.
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