Retrotec DucTester 200 Series Residential Applications - Manual (Page 33)

Page 33 of 91
©Retrotec Inc. 2015
(Flow per
Area) @
Pressure
Off
Off Off
EqLA per Area
Off
Off Off
(EqLA per
Area) @
Pressure
Off
Off Off
EfLA per Area Off
Off Off
(EfLA per
Area) @
Pressure
Off
Off Off
4.3 Setting up the DM32 gauge for Duct Testing
When the 200 fan is used for Duct testing, it is called the 240 on the DM32. Be sure to choose this
Device so that the correct n value will be used to calculate the @ pressure, and the correct fan flow
coefficients will be used to calculate flow.
4.4 Setting up and using the DM-2 gauge for Duct testing
1. Set up the gauge to show the results you require
Press [Mode] to cycle through available results. Typically, choose between Flow, and
Flow/Area.
Units for flow are typically CFM, and units for Flow/Area are typically CFM/ft 2 , CFM/100 ft 2 ,
or CFM/1000 ft 2 .
If a desired results mode such as Flow/Area does not appear as a choice, press [Setup] ,
scroll to "Mode Setup", press [Enter] , scroll down to "Flow/Area", and choose the desired
units by pressing [  ] or [  ] . When required units are displayed, Press [Exit] twice, and the
Flow/Area in the chosen units will be one of the choices when the [Mode] key is pressed.
2. Set up the gauge to show only the fans and ranges you need, and set the ones currently in use
Press [Device] to get “Retrotec DU220”. Devices can be disabled or enabled by pressing
[Setup] and going into the “Device Setup” menu
Press [Range Config] to get "Mid". If Range Ring installed on fan is not Mid-Range, adjust
the setting on the gauge to match what is installed. Range Configurations can be disabled
or enabled by pressing
[Setup] , going into the “Device Setup” menu, and selecting
individual Devices and the choosing from the available Range Configurations.
3. Set up the gauge for proper time averaging and ensure that it will be Auto Zeroed.
Press [Time Avg] to get “4s”, or go to 8 seconds if it’s fluctuating.
Press [Auto Zero] to get “On”.
4. Adjust fan speed on DucTester