Trane SCXG-SVX01B-EN manual pre-startup, Installation requirements, Transducer Location

pre-startup

Installation requirements

Static PressureTransducer Installation (VAV units only)

Supply air static pressure controls the inlet guide vane and inverter options. A static pressure head assembly ships separate in the control panel for field installation in the supply air duct work. The installer is responsible for providing pneumatic tubing.

Transducer Location

Place the head assembly in an area of the ductwork that will provide an average and evenly distributed airflow pattern. Use the following guidelines to determine an appropriate installation location.

1.Locate the static head assembly about

2/3 to 3/4 of the way down the longest duct run, in an area approximately 10 duct diameters downstream and 2 duct diameters upstream of any major interferences, turns, or changes in duct diameter.

2.When installing pneumatic tubing between the head assembly and transducer in the control panel, do not exceed 250 feet for 1/4” OD tubing or 500 feet for 3/8” OD tubing.

Installing theTransducer

Complete the following procedure to properly install the inlet guide vane static pressure transducer.

1.Mount the pressure sensing head assembly in the duct so that the sensing tip is in the middle of the duct so that it will provide a proper pressure measurement. See Figure I-PR-6.

2.Connect the pneumatic tubing from the sensing head to the push-on tubing connection in the control panel. Use a plastic static pickup tubing. Do not exceed 250 feet for 1/4“ OD tubing or 500 feet for 3/8” OD tubing.

The transducer inside the control panel picks up low side or reference pressure.

Note: If plastic tubing pulls away from a connection, trim it back before replacing it on the fitting. Stretched tubing may leak and cause faulty control.

Figure I-PR-6. Static pressure sensor installation

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