Appendix b: flow equations used with devices – Retrotec DM32 User Manual
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©Retrotec Inc. 2014
Appendix B: Flow Equations used with Devices
The gauge can be used for testing either on its own, or connected to a specialized, calibrated fan which is
identified on the gauge as a Device. Read the Retrote
which might also be
called the Blower Door Operation Manual (available at Retrotec’s website) for how to properly use Blower
Door Test Fans as Devices.
Select the proper Device and Range in order to obtain the correct results. The Device set on the gauge
must match the Device in use for the test and the Range set on the gauge must match the Range Ring and
Plate installed on the Device. Refer to section 3.3.2 for instructions on how to select the proper Device,
and select the proper Range.
The gauge can be used with a Retrotec calibrated fan and other similar devices produced by other
manufacturers. The Retrotec Umbilical cable includes all necessary tubes and cable connections. The
pressure tubes in the Umbilical cable are color-coded. The pressure and hardware connection ports are
also clearly labeled on the top of the gauge.
To connect the gauge to a Retrotec fan or variable speed fan drive
1. Locate the end of the Umbilical cable (this is the bundle of pressure tubing and Control Cable)
with the shortest length of exposed pressure tubes and Control Cable. Plug the yellow Control
Cable into the “Fan Speed” Control port on the gauge.
2. Plug colored tubes into the matching color-coded pressure ports on the top side of the gauge.
Ensure the tubes are snugly connected to the ports. Depending on the system, Umbilical cable
can contain red, yellow, green, and/or blue tubes.
3. From the other end of the Umbilical cable, plug the yellow Control Cable into the port labeled
“Control” on the fan.
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. 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.