Demonstration/How-To Photos

Primary, Secondary and Blower Air Inlet Settings

A critical phase of successful set up of a Paxo® boiler for operation involves setting three air supply openings:

1. Primary Air Setting
2. Secondary Air Setting
3. Blower Air Inlet Setting

Charts below will help you determine how to set each one, depending on the model of your boiler and the variables affecting its operation like sood moisture content and chimney draft.

Paxo® Boiler Air Adjustment Guide

Air Controls Functions

The sliders on the blower/blowers-depending on the model, determine how much air is available to both primary and secondary combustion chambers. These openings are the sole source of air for all combustion in the Paxo® boiler.

The primary air inlets determine how much air is available in the primary (upper) combustion chamber, where the fuel undergoes pyrolysis.

The secondary air inlets regulate how much air goes into the steel tubes, where it is superheated before being used by the nozzle/nozzles to achieve secondary gasification.

Proper air adjustment is critical to achieve the most efficient boiler’s performance. If dry wood is used for burning and it is positioned properly over the nozzle, but there is smoke coming out of the chimney, usually it indicates that not enough air is reaching the secondary air tubes.

The steel plate upon which the fan or fans is mounted can be removed with 12 sheet metal screws to gain access to the primary air inlet sliders. When placing the steel plate back, make sure to apply even pressure to all the screws to form a consistent seal. Without a consistent seal, smoke will leak around the gasket and into the boiler room