Retrotec DM-2 User Manual
Page 42
Page 42 of 72
©Retrotec Inc. 2012
4. Attach the yellow pressure tube to the yellow bulkhead fitting labeled “Ref B (fan)” on the
fan. If available, the green pressure tube should be attached to the green bulkhead fitting
labeled “B (+)” on the fan.
5. Attach the Umbilical power cord to the port labeled “12V DC” or “DM-2 Power” on the Fan
Top, if the gauge requires recharging.
6. Pass the red pressure tube through the Door Panel and lay the end down out of the way of
any air flow from the fan.
The Retrotec gauge can be connected to fans from other manufacturers such as the Minneapolis
Model 3 and Model 4 fans.
To connect the gauge to a Minneapolis Model 3 or Model 4 Fan
1. Using the included Retrotec Umbilical cable, connect the yellow pressure tube from the
yellow port of the gauge to the open port on the fan.
2. Some newer versions of the Model 3 and 4 contain an additional Reference port. If
available, connect the green tube in the Umbilical cable from the green port on the gauge to
the Reference port on the fan.
3. The power and Control Cables included in a Retrotec Umbilical cannot be used when using a
3
rd
party fan. Make sure the batteries are fully charged, prior to beginning testing.
8.2 Control a fan with the gauge to measure pressure and flow
After making the necessary connections between the gauge and the fan, follow these steps to begin a
test.
To conduct a basic pressure test and ensure your gauge is working
1. Turn the gauge on by pressing
[On/Off]
.
2. Press
[Exit]
to exit the welcome splash screen.
3. Check the battery power before beginning a test to ensure the gauge has enough power to
complete the test. (Plug the gauge in, recharge or replace batteries if needed).
4. Select the appropriate device to which the gauge is connected by pressing
[Device]
.
5. Select the Range Configuration installed in the fan by pressing
[Range Config]
.
6. Press
[Mode]
to select the required results to display. Note that the mode can be changed
at any point during the test to view different results.
7. Select an appropriate time averaging value for the test conditions by pressing
[Time Avg]
.
8. Ensure that
[AutoZero]
is on.
9. Press
[Baseline]
to begin acquiring a baseline pressure reading. Press
[Enter]
after 60
seconds to set the baseline reading.