P32AF-2C Johnson Controls Pressure Control

Datasheet

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The Johnson Controls P32AF-2C SENSITIVE DIFF Pressure Control; DIFF Air PressureSURE Switch; SPDT; .05/5″WC; .025 SENS ADJ S.P.; W/SCALE;”U”BR

This P32 differential pressure switch is for use in combustion applications where a proof of air flow is needed for proper system operation.

Typical applications include:

• Pulse combustion appliances.
• Appliances with power vented exhaust.
• Any appliance that requires proof of flow before initiating burner operation.

In all combustion applications, the P32 must be used in conjunction with a backup device to either check the P32’s operation each time the appliance cycles, or to operate independently of the P32 to de-energize the burner circuit should improper appliance operation occur. (See P32 Application Chart and explanations.)

All P32 switches are designed for use only as operating controls. Where an operating control failure would result in personal injury and/or loss of property, it is the responsibility of the installer to add devices (safety, limit controls), or systems (alarm, supervisory systems) that protect against, or warn of, control failure.

Features

• Easy-to-read set point scale.
• Versatile mounting options.
• Durable construction.
• Set point switching repeatability.

General Description

This control senses a change in the differential pressure (either velocity pressure or pressure drop across a fixed restriction) as air flow in the flue changes. The differential pressure, as sensed by the two sensing ports, is applied to the two sides of a diaphragm in the control. The spring loaded diaphragm moves and actuates the switch. The P32 can also be used to detect small positive gage pressure by using only the high pressure connection and leaving the low pressure connector open, or to detect vacuum by using only the low pressure connection and leaving the high pressure connector open to ambient pressure.