Air Shutter with Automatic Closing

This characteristic of the ECO models slows down the cooling process of the boiler when the burner is turned off, limiting the thermal shock as a result.

An effective energy saving is obtained from this feature.

Air Adjustment

On the models of the ECO series it is possible to adjust the amount of air entering the burner:

• 1 stage burners.
  Adjusting the air shutter opening can be carried out externally without removing the burner casing.
• 2 stage burners.
  The air shutter is actuated by an electric servo control. Air adjustment for the first and second stage is carried out on the appropriate servo control cams.

There is a brief delay for the second stage starting with regard to the initial air opening. This delay is adjustable with a suitable cam on the servo control, for adjustment to the type of installation.

Combustion Head Adjustment

This may be carried out with the burner on. For an optimum combustion the position of the diffuser can be varied in regard to the trunk/tapered section of the combustion head by adjusting the appropriate screw.