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54
Q FAN ASSEMBLY
Housing
Housings are 14-gauge steel
hydraulically expanded to form
integral inlet bell and diffuser sections.
Hydraulically expanded stiffening ring
welded in area of wheel raceway. On
VAV variable speed fan units, fan inlet
supports are structurally reinforced to
handle extra stresses of variable speed
fan modulation and fan is balanced at
ten different fan speeds over the
desired operating range.
Inlet/Outlet Shells
Fan has tapered inlet and outlet
shells over fan hub assembly. Shells
uniformly accelerate air through
blade area. End bell covers fan drive
assembly, thereby reducing flow
turbulence. Eight fan blades are
precision aluminum casting with airfoil
cross sections. Blade to shell clearance
is in the range of 30 mils.
Fan Wheel
Fans size 16-44 have fan wheel of
precision aluminum casting with eight
radially projected blades with air-foil
cross sections.
Fans size 49-60 have fan wheel of
sixteen precision cast and machined
aluminum blades mounted on a steel
wheel plate.
All wheels are dynamically balanced
and keyed to fan shaft.
Diffuser
Cast aluminum diffuser with 29 radially
projected straightening vanes with
airfoil cross sections. Leading edge of
vanes are curved to reduce tone noise
generation. Clips on almost every other
vane eliminate harmonic ring potential.
Shaft
Solid AISI-C1040 hot-rolled steel, turned
and polished. Close tolerances
maintained where shaft makes contact
with bearings.
Bearings
Precision, flange-mounted, self-aligning
ball bearings at inlet and discharge.
Bearings on all sizes are grease
lubricated and selected for a minimum
average life (AFBMA L-50) in excess of
200,000 hours at maximum cataloged
operating conditions. Bearing
greaselines are extended out through
fan shell for easy servicing.
Mechanical
Specifications
Drives
Mechanical drives are computer
selected for low noise, low
maintenance operation. Center
distance and arc of contact is
maintained within prefixed limits.
Constant speed fans use variable or
constant pitch drives; variable speed
modulated fans use fixed drives only.
SUPER QUIET II FANS
Trane Super Quiet II (SQ2) fans include
fan housing, wheel, shaft, bearings,
diffuser section, motor mounting
support, ODP standard or high
efficiency motor, drives, spring
isolation in acoustically-treated casing
in a factory-assembled unit. Fan motors
are outside of airstream.
Constant volume units (SQ2C) are
equipped with variable or constant
pitch drives. Variable air volume units
(SQ2V) use adjustable frequency
inverters for fan capacity modulation
and must have constant pitch drives.
Inlet vanes are NOT available for
Super Q II fans.
ENCLOSURE
Fans are internally isolated on four
height saving spring isolators and
then flex connected inside of an airtight
acoustical enclosure. Walls are
16-gauge steel, internally lined with
two-inch thick three-pound per
square foot density fiberglass. Airside
surface of acoustical lining is coated
with black matte faced lining to prevent
scuffing.
Enclosure has two large full size
side access panels. Access panels are
fully gasketed and mechanically
attached to casing for easy removal.
Enclosure has access panel positioning
feet to insure easy access panel
replacement after removal.
Duct connections in enclosure end
panels slip connect to standard U.S.
round duct sizes.
Fan grease lines are extended through
enclosure for easy servicing of fan.
Optional fan motor leads are extended
through casing for easier installation.
Two rails support the entire enclosure.
Rails can be rested on floor or hung
from the ceiling with steel rods. Ducts
can be directly connected to enclosure
since fan is internally isolated.
Enclosure is rated for four-inch
negative or five-inch positive pressure.