STATIC PRESSURE MEASUREMENTS IN SIX EASY STEPS - HVAC TODAY
From hvactoday.com Reviews 2Published Oct 1, 2017Estimated Reading Time 8 mins
Locate the appropriate locations to drill the test ports on the supply side (+) between the furnace and the coil, and on the return side (-) between the filter and the furnace.
Drill test ports using a 3/8′ drill bit with a metal piercing tip. A bullet-tip drill makes a clean round port. So make sure to use your drill bit sheath (described above) to help prevent you from drilling into the coil.
Push one end of the tubing onto a static pressure tip. Place the other end of the hose on the HIGH (+) pressure port of the gauge. If required, make sure the gauge is level and zero it out by adjusting the screw on the face with a small screwdriver.
Read the supply or positive (+) static pressure by inserting the static pressure tip into the test port with the tip facing into the airflow. The magnet on the tip will hold it in place while the value is read and recorded.
Read the return or negative (-) static pressure next by moving the tube from the HIGH to the LOW-pressure port on the gauge. You should insert the static pressure tip into the test port on the return side with the tip facing the airflow.
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