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Printed In Canada 01524r10.doc TAC2000/TAC3000 Manual 12/03/2009 Page
2
1.4.2.
FAN BLADE TIP SPEED
WARNING:
The fan system must not exceed a
blade tip speed of 20,000 feet/minute. Exceeding
this speed may cause damage to and/or failure of
the fan, which in turn may cause injury or death, or
damage to the radiator and surrounding equipment.
To calculate the blade tip speed, use the following
formula:
Fan Diameter (Inches) X 3.14 X Fan RPM
12
If your calculated tip speed exceeds 20,000 ft/min,
contact Flexxaire directly, prior to installation.
It is
important to use Fan RPM and NOT engine
RPM.
1.5.
FAN OVERVIEW
Flexxaire’s TAC2000/TAC3000 fan systems are
designed to minimize overheating caused by debris
plugged radiators, screens and guards, and reduce
overcooling in low ambient temperatures. The
blades of the TAC2000/TAC3000 vary pitch, not
speed, to control air flow volume and direction.
How your TAC2000/TAC3000 works:
The TAC2000-P/TAC3000-P is a pneumatically
actuated variable pitch fan. The TAC2000-
H/TAC3000-H is a hydraulically actuated variable
pitch fan. The blades are held in full pitch by a
heavy spring. As pneumatic (or hydraulic) pressure
is applied to the control line, the pitch of the blade is
reduced and then reversed. When the pressure is
released, the fan blades return to their default
position. The TAC2000/TAC3000 has a number of
important features:
1.
Fail Safe Operation: The blades are spring
loaded into the default full pitch position. If
the fan loses pressure, the fan will default to
full pitch and act like a fixed pitch fan giving
maximum cooling.
2.
Depending on the control kit ordered (see
Section 2.0), the fan can be run in a neutral
pitch (or any pitch in between) to solve
overcooling problems and save horsepower
and fuel.
3.
When purging, there are no horsepower
spikes, in fact, the horsepower drops off as
you pass through neutral pitch, then slowly
builds as pitch increases.
2.0.
CONTROL KITS
Due to the variability of machines that the TAC2000/
TAC3000 fan may be installed on, the fan does not
include any control components. Flexxaire has a
number of different control kits available to suit a
wide range of applications:
PNEUMATIC CONTROL
:
-2 Position kit (Manual Purge)
-2 Position kit with timer (Manual and Auto Purge)
-3 Position kit (Manual Purge with neutral capability)
-3 Position kit with timer (Manual and Auto Purge
with neutral capability
-Full Variable Pitch Controller (Full fan control)
-Each kit is available with or without an air
compressor.
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