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Models TCF and Model QEI/QEID Centrifugal
®
QEI/QEID Radial Gap
Adjust inlet cone position such that the radial gap
between the wheel cone and inlet cone is evenly
distributed around the wheel.
QEI/QEID Alignment
If necessary, adjust wheel position by loosening the
wheel hub from the fan shaft so that a straight edge
held tight to the wheel cone just touches the inlet
cone. Refer to drawing below.
1 Fan
Wheel
Dia.
Good
Poor
Turning
Vanes
1 Fan
Wheel
Dia.
Length of
Straight Duct
Poor
Good
PoorGood
Straight Edge
Wheel
Cone
Inlet Cone
Radial
Gap
TCF Size Dimension A (in.) Dimension A (mm)
18 6
3
⁄8 ±
1
⁄8 86 ±3
20 7
±
13
⁄16 178 ±5
22 7
13
⁄16 ±
13
⁄16 198 ±5
24 8
5
⁄8 ±
1
⁄4 219 ±6
27 9
7
⁄16 ±
1
⁄4 240 ±6
30 10
9
⁄16 ±
3
⁄8 268 ±10
33 11
7
⁄16 ±
3
⁄8 291 ±10
36 12
3
⁄4 ±
3
⁄8 324 ±10
40 14
3
⁄16 ±
3
⁄8 360 ±10
44 15
9
⁄16 ±
3
⁄8 395 ±10
49 17
1
⁄8 ±
1
⁄2 435 ±13
54 18
13
⁄16 ±
1
⁄2 478 ±13
60 20
15
⁄16 ±
1
⁄2 532 ±13
66
22
7
⁄8
±
1
⁄2 581 ±13
73 25
1
⁄2 ±
1
⁄2 648 ±13
REMOVING FROM STORAGE
As fans are removed from storage to be installed
in their final location, they should be protected and
maintained in a similar fashion, until the fan equipment
goes into operation.
Prior to fully assembling and installing the fan and
system components, inspect the fan assembly to
make sure it is in working order.
1. Check all fasteners, set screws, wheel, bearings,
drive, motor base and accessories for tightness.
2. Rotate the fan wheel by hand and assure no parts
are rubbing. Access to the wheel is obtained
through an access panel located on the side of the
fan housing.
3. Ensure proper wheel settings for radial gap and
alignment. See below.
Radial Gap, Overlap & Alignment
Efficient fan performance can be maintained by having
the correct radial gap, overlap and alignment. These
items should be checked before start-up and after the
fan has been in operation for 24 hours.
TCF Radial Gap
Radial gap is adjusted by loosening the inlet
cone bolts and centering the cone on the wheel.
If additional adjustment is required to maintain a
constant radial gap, loosening the bearing bolts and
centering wheel is acceptable
as a secondary option.
TCF Overlap
Overlap is adjusted by
loosening the wheel hub from
the shaft and moving the
wheel to the desired position
along the shaft. The chart
shows the proper distance
between the wheel and
the inlet cone.
Installation
Installations with poor inlet or discharge
configurations may result in reduced fan performance.
Ducted Installations
Inlet Duct Turns – Installation of a duct turn or elbow
too close to the fan inlet reduces fan performance.
Restricted or unstable flow at the fan inlet can cause
pre-rotation of incoming air or uneven loading of the
fan wheel, yielding large system losses and increased
sound levels. To achieve full fan performance, there
should be at least one fan wheel diameter between
the turn or elbow and the fan inlet.
Overlap
Radial
Gap
A
1 Fan
Wheel
Dia.
Good
Poor
Turning
Vanes
1 Fan
Wheel
Dia.
Length of
Straight Duct
Poor
Good
Good
1 Fan
Wheel
Dia.
Good
Poor
Turning
Vanes
1 Fan
Wheel
Dia.
Length of
Straight Duct
Poor
Good
Poor
Discharge Duct Turns – Fan performance is reduced
when duct turns are made immediately off the fan
discharge. To achieve cataloged fan performance
there should be at least three equivalent duct
diameters of straight ductwork between the fan
discharge and any duct turns.