Duct Pressure Switch Installation

Mount the airflow switch on a flat surface ideally in a clean dry environment but can be mounted externally. Remove plastic cover from p2 nozzle of airflow switch both p1 and p2 are now open to atmosphere. Install a duct pressure switch from grainger to help your hvac system do its job.

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Install the pressure switch on the supply plenum or in a main supply duct.

Duct pressure switch installation.

Mark a point on the side of the plenum or duct where a hole will be drilled for the barbed sensing pressure probe. Mount the switch in vertical plane so that the nozzles are pointing down as shown in fig 1. Orient the open end of the elbow towards the direction of the central blower air handler see figure d. Push the included silicone tubing onto the barbed pressure probe and push the 90 plastic elbow into the open end of the tubing.

Installing too close to a duct booster fan will cause the switch to short cycle the fan see figure b. 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. 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. Install a duct pressure switch from grainger to help your hvac system do its job. Drill 2 1 16 pilot holes where mounting bracket holes were marked.

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