While our customers are wholesalers, Packard knows that you, the contractor, have a choice. You are often presented with many buying options, and being well-informed about your purchase can help make your job easier and more successful. Our Tech Tips are also very helpful for our wholesalers as we present product information that can help as contractors have questions.
This is why we have dedicated a section of our site for contractors and wholesalers. In this section, you will find helpful product tips, tools and some clips from our training classes. We’ve also provided a distributor locator so you can find the nearest wholesaler who can give you access to Packard products.
Pressure Switches with Draft Inducers.
Can any pressure switch be used with a draft inducer?
For a gas furnace to operate properly, it must have a “clean burn”, that is, proper combustion, as well as proper exhaust of carbon monoxide. A critical component designed to provide proper airflow resulting in safe and clean combustion in the furnace is the draft inducer. In conjunction with the draft inducer, the pressure switch assures that the proper vacuums and pressures are present before gas is released and the furnace operates.
This requires that the pressure switch be matched properly to the draft inducer and the furnace. This match is based upon vacuum and pressure settings. When the proper vacuums and pressures are developed by the draft inducer, the pressure switch responds and allows gas to be released for combustion.
The pressure switch must match the vacuum and pressure settings identified by the furnace manufacturer. The proper draft inducer develops these vacuums and pressures. When using a field adjustable pressure switch, it must be set to operate at the levels established by the manufacturer.
To calibrate a field adjustable pressure switch, a multi meter or continuity meter, a manometer, a set of test leads, and an air source with flexible tubing and a ¼" tee connector are required. A pressure switch should not be used if it is not pre-calibrated, or calibrated in the field, to the operating point established by the furnace manufacturer. Using the wrong pressure switch can result in improper furnace operation and deadly levels of carbon monoxide.
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