Retrotec DucTester 200 Series Residential Applications - Manual (Page 34)

Page 34 of 91
©Retrotec Inc. 2015
Use [Set Pressure] on gauge. Press [Set Pressure] [25] [Enter] . The fan will automatically
accelerate and maintain a pressure of 25 Pa in the duct system. Press [@ Pressure] until
“@ 25 Pa” is displayed to view the result at exactly 25 Pa. If your standard requires 50 Pa,
substitute 50 for 25.
OR
Use [Set Speed] on gauge. Press [Set Speed] [50] [Enter] to set the fan speed to 50%.
Press [Jog/Hold] until "Jog" appears. Use [  ] or [  ] to adjust the speed until “Pr A”
displays close to 25 Pa. Press [@ Pressure] until “@ 25 Pa” is displayed to view the result
estimated at exactly 25 Pa. If your standard requires 50 Pa, substitute 50 for 25.
OR
Use the manual Speed Control Knob on the Fan Top. Increase the fan speed until a stable
pressure of 25 Pa (or -25 Pa) is displayed on “Pr A”. Press
[@ Pressure] to display the
results is displayed at the “Mode” at exactly 25 Pa. If your standard requires 50 Pa,
substitute 50 for 25.
5. If "TOO LOW" appears as the flow result, or the desired test pressure cannot be reached, change the
Range Configuration on the fan and on the gauge to match (see section 3.10).
Figure 32: DM-2 screen set up for measuring flow in CFM (left) and Flow per unit Area @25 Pa (right).