Duct Pressure Switch Installation
Mount the airflow switch on a flat surface ideally in a clean dry environment but can be mounted externally.
Duct pressure switch installation. Remove plastic cover from p2 nozzle of airflow switch both p1 and p2 are now open to atmosphere. Mark a point on the side of the plenum or duct where a hole will be drilled for the barbed sensing pressure probe. Installing too close to a duct booster fan will cause the switch to short cycle the fan see figure b. Duct pressure switches automatically start and stop auxiliary devices like electronic air cleaners duct heaters humidifiers exhaust fans and duct booster fans.
Orient the open end of the elbow towards the direction of the central blower air handler see figure d. Drill 2 1 16 pilot holes where mounting bracket holes were marked. 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.
Mount the switch in vertical plane so that the nozzles are pointing down as shown in fig 1. An air switch senses positive negative or differential air pressure and actuates an internal switch. Install the pressure switch on the supply plenum or in a main supply duct.