Specialty Models
Air Pressure Sensing Switches

DFS-460 Manual Reset Model
The Model DFS-460 is a general purpose airflow proving switch designed to require manual operator reset following actuation. It can be used to sense positive, negative, or differential air pressure in any HVAC and Energy Management applications that require operator interface. Set point is fixed to operate on pressure rise at 0.40±0.06″ w.c.

The plated housing contains a diaphragm, a calibration spring and a snap-acting SPST– NC switch with manual reset button.

The sample connections located on each side of the diaphragm accept 1⁄4″ OD rigid tubing via the integral compression ferrule and nut.

An enclosure cover protects the operator from accidental contact with the live switch terminal screws. The enclosure cover accepts a 1⁄2″ conduit connection.

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DFS-460.pdf

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