Duct Pressure Switch Installation

Installing too close to a duct booster fan will cause the switch to short cycle the fan see figure b.

Duct pressure switch installation.

Install a duct pressure switch from grainger to help your hvac system do its job. Orient the open end of the elbow towards the direction of the central blower air handler see figure d. Mount the airflow switch on a flat surface ideally in a clean dry environment but can be mounted externally. Drill 2 1 16 pilot holes where mounting bracket holes were marked.

Install the pressure switch on the supply plenum or in a main supply duct. An air switch senses positive negative or differential air pressure and actuates an internal switch. Install a duct pressure switch from grainger to help your hvac system do its job. Mark a point on the side of the plenum or duct where a hole will be drilled for the barbed sensing pressure probe.

An air switch senses positive negative or differential air pressure and actuates an internal switch. Duct pressure switches automatically start and stop auxiliary devices like electronic air cleaners duct heaters humidifiers exhaust fans and duct booster fans. Remove plastic cover from p2 nozzle of airflow switch both p1 and p2 are now open to atmosphere.