Retrotec DucTester 200 Series Residential Applications - Manual (Page 11)

Page 11 of 91
©Retrotec Inc. 2015
1.1.2. Retrotec calibrated fan: Model 200
The Model 200 fan is included in the DU200, DE200, and DK200 duct testing systems; and included in
the US200, EU200, and UK200 Blower Door systems for testing tight enclosures. This 0.25 hp fan is
designed for use with the Retrotec digital gauge, which will control the fan to any desired Set Pressure
or Set Speed. Alternatively, it can be controlled via a manual Speed Control Knob, allowing the gauge to
be used for other tests while the fan continues to run. The Model 200 Fan has a Fan Top that includes a
built in speed control knob, an on/off switch, and the ability to chain multiple fans together which allows
control of multiple fans using a single gauge.
Figure 3: Retrotec Model 200 has a speed control knob and two Ethernet style Speed Control Ports for daisy chaining speed
controls.
The Model 200 has two Fan Pressure sensors (located inside the fan inlet), and two self-referencing
pickups (located just above and below the fan inlet) which are connected to the single green and yellow
ports.
Figure 4: Fan Pressure sensors are located in the fan inlet.
The two Fan Pressure sensors are located just inside the fan inlet, behind the protective grill. Together,
they measure the Fan Pressure, from which the fan airflow is calculated in the gauge. If the sensors
become blocked, it is possible to clear them by attaching a pressure tube to the yellow Ref B port, and
blowing air through the tube gently. A whistling sound should be heard, indicating air is flowing through
the sensors.