BY GEORGE LANTHIER
Figure 4
Figure 5 draft conditions before operation but also during operation at all times when the burner is running and possibly create a post-purge. Another control may be a post-purge control, or relay-timer that will keep the inducer running after the burner has shut down and allows for the purging of all of the hot gases from the unit. Now, this may sound like a lot of expensive equipment, and you may ask‘ why won’ t the control and burner companies make it simpler’? You see they have, and for a long time now. We’ ll look at all of the most common options and one new one.
Inducer installation and wiring should always be done to the manufacturers( OEM) instructions while in compliance with all Codes. Figure 5 shows a typical installation for an inducer. Note that the sensing line can be aluminum or copper tubing. Brake line also makes good material for this use being acid resistant steel tubing.
Let’ s look at a generic wiring diagram for a basic operating control for inducers, Figure 6, with a typical hot water boiler controller. The burner can be a line voltage gas or oil burner or if a 24 Vac gas burner or control is being used, the power transformer for powering that system can be located across those terminals.
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26 JUNE 2025 | FUEL OIL NEWS | www. fueloilnews. com