Retrotec DucTester 341 Manuale Utente Scaricare il pdf (Pagina 56)

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©Retrotec Inc. 2014

Adjust the [Set Speed] until Channel A reads a pressure of 0 Pa. Record the flow in CFM. To have the

DucTester automatically acquire and maintain a 0 pressure, press [Set Pressure] [0] [Set] and the gauge

will cause the DucTester to increase in speed to eliminate whatever pressure it sees at the time that the

keys are pressed.

Ensure the pressure that is to be set to 0 actually exists before the keys are pressed because it uses the

direction of the pressure to set the direction of control. This means that the will fan speed up to

eliminate the pressure it first sees regardless of sign. Make sure the “@ Pressure” feature is turned off,

otherwise erroneous results will occur due to the result being divided by whatever tiny pressure occurs

above or below zero.

Optional

Sierra Building

Science device

for measuring

air handler

flow using a

blower door

connected with

flex to a return.

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Retrotec DucTester 341 Manuale Utente Pagina 56