Retrotec Blower Door - Manual (Page 20)

Page 20 of 87
©Retrotec Inc. 2015
2. Choose a calibrated fan suited to your application
Retrotec has a number of calibrated fans designed to operate under different conditions and with different features
suited to the various applications.
2.1 Model 1000 for testing homes
The 1000 model fan is a basic ¾ horsepower fan with built in speed control and dual Control Ports. Multiple fans can
be daisy chained together, and simultaneously controlled by a single DM-2 Digital Pressure Gauge. Speed can be
controlled via the DM-2, or manually controlled with the knob on the Fan Top.
Figure 12: Model 1000 fan with two electrical plates containing power connection and switch, dual Control Ports and manual speed knob.
To connect the 1000 to the DM-2 Digital Pressure Gauge
1. Connect the power cord from the fan to a compatible wall outlet.
2. Connect one end of the yellow tube from the Umbilical to the yellow port on the fan labeled “Ref B” and the
other end to the yellow port on the gauge labeled “Ref B (-)”.
3. Connect the Speed Control Cable from the DM-2 “Speed Control” port to the left “Control” Port on the fan.
2.2 Models 3300 and 3300SR high flow fans
The 3300 and 3300SR fans are 2 horsepower fans suitable for residential and commercial testing. The fans are fully
automatic and can be controlled through the DM-2. They include a variable speed drive which is the red box
containing a 3-phase power supply. The 3300SR fan has an additional green reference pressure port: SR stands for
self-referencing.
A self-referenced fan is able to compensate for when the fan is blowing air towards the gauge (and fan operator).
Normally a correction to the Fan Pressure is made in the DM-2, but with an SR fan, this correction is not required.
See section 1.1 for a detailed explanation of self-referencing.
It is important when using an SR fan to choose the correct Device in the DM-2: 3000SR.
The 3300 and 3300SR fans are not designed to operate on GFCI protected circuits. Doing so may cause the circuit
breaker to trip. Ensure that a dedicated 20A circuit is available for each fan. Stove top electrical outlets are an ideal
20A circuit to which to connect the 3300(SR) fans. Do not operate multiple 3300 or 3300SR fans on the same circuit,
since each fan at maximum speed can draw up to 20.4A. Do not operate other loads on the same circuit as the fans
during the test.