Retrotec Multi-Fan Blower Door - Manual (Page 12)

Page 12 of 37
©Retrotec Inc. 2015
3. Options for controlling the speed of multiple fans
There are two methods of speed control for your multi-fan setup. You can either control the speed of all
fans with one gauge (Common set point), or let each fan’s speed be controlled with different gauges
(Individual set point). There are advantages and disadvantages for each of the fan speed control
methods you choose. Reasons for choosing one over the other are described in the scenarios of section
0 using FanTestic software, which provides either Common set point or Individual set point control of
the fans.
3.1 Common set point control
One gauge called the “Primary gauge” controls all fans. Common set point control can be accomplished
by one of three methods, either manually with gauges only or using FanTestic software to control the
gauges:
3.1.1. Without FanTestic software
Use a Speed Control Splitter to connect the “Primary Gauge” Speed Control Cable to multiple fans
(part number: FN280 – see section 7)
Daisy chain fans together (possible if Fan Tops have two Control ports – see section 6) so their Speed
Control ports can all be connected to the single “Primary Gauge”.
3.1.2. With FanTestic software:
Turn Individual Control in FanTestic OFF (unchecked: ) and have the “Primary
Gauge” connected to the computer running FanTestic software.
3.2 Individual set point control
Each fan has an associated gauge that is used to control that fan: one gauge controls one fan, another
gauge controls another fan. Individual set point can be accomplished by one of two methods:
3.2.1. Without FanTestic software:
Connect Speed Control Cables (Ethernet style) from each gauge to each fan directly (i.e., Not using a
Speed Control Splitter and not daisy chaining fans together)
3.2.2. With FanTestic software:
Turn Individual Control in FanTestic ON (checked: )