Retrotec Blower Door - Manual (Page 17)

Page 17 of 87
©Retrotec Inc. 2015
While the gauge connected to the Speed Control Splitter will control the fan speed of all connected fans, it can only
measure the Fan Pressure from one fan.
Flow and/or Fan Pressure will still need to be measured simultaneously
from each fan to get accurate airflow results. Do not add the
measured Fan Pressure from each fan. Instead, convert the Fan
Pressure to CFM (flow) (or adjust the gauge to display Flow in CFM),
then add the numbers for flow together.
1.5.4.1. Control multiple fans using one primary gauge
Set up the Door Fans and digital gauges according to Figure 10 and the following procedure.
Controlling multiple Door Fans using a Speed Control Splitter
1. Set up Door Fans in doorway(s)
2. Connect Drives to Door Fans using the Drives’ Umbilical
3. Connect yellow and green tubes from the gauge to each Drive
4. Connect Control Cables from each Drive to the Speed Control Splitter (Model: FN280)
5. Connect a Control Cable from the Speed Control Splitter to one gauge (“Primary Gauge”)
6. T-connect the red tubing from each of the gauges together
7. T-connect the blue tubing from each of the gauges together
8. Pass the red tube through the port in the panel and toss away from the Door Fans’ airstream
9. Use [Set Speed] or [Set Pressure] function on the Primary Gauge to control the same speed on all Door Fans
Figure 9: Current Speed Control Splitter
(Part number FN280) works in all configurations.