TCF DWDI BC Instruction manual
Removing Old Cone or Vane
See Figure 2 for identification of all items referenced.
1. Shut off fan and lock out electrical power.
2. Remove belt guard and/or inlet screens.
3. Adjust motor position and remove belts and drive sheave.
4. Clean and remove rust from sections of fan shaft that extend
through the fan bearings. File smooth any burrs. Remove
bearing bolts and raise the shaft enough to take weight off the
bearing.
5. Working through fan outlet or through access door, block
under periphery of fan impeller so that fan housing supports
the fan impeller.
6a. For Fan With Setscrew Locking Collars — Loosen set screws in
bearing. Using wedges or pry bars, slide bearing off end of
shaft. If it is necessary to force bearing, use a brass rod to drive
against inner race of bearing only.
6b. For Fans With Split Type Bearing — Remove bearing cap,
bearing housing and bearing insert off end of shaft. If the
bearing insert must be removed by inexperienced personnel, it
is recommended that the bearing manufacturer be contacted
to provide instructions for dismounting.
7a. For Old Inlet Funnel Removal — Loosen fasteners that hold
inlet cone and bearing support frame to the housing side.
Remove old inlet cone and bearing support frame.
7b. For Pre-1981 Style Inlet Vane Removal — Remove hardware
from old vane, which attaches it to the housing side. Remove
control arm (or drive link). Loosen fasteners that hold inlet
cone and bearing support frame to fan housing side, then
remove old inlet vane and bearing support frame.
7c. For Post-1981 Style Inlet Vane Removal — Remove nut (item
16) and pull connecting arm out of the way. Loosen fasteners
that hold inlet vane and bearing support frame to the housing
side, then remove the inlet vane and bearing support frame.
8. Repeat steps 4, 6 and 7 on other side of the fan.
Assembling Nested Inlet Vane
1. UsingFigure2asaguide,assembleitems4through16tothe
inlet vane. Measure threaded linkage rod (item 6) to fit.
2. Centerinletvanein locationof oldvaneor cone,androtate
until inlet vane control ring is approximately in the same
position as shown in Figure 3. If old control linkage is being
reused, locate control ring clip so that connecting link can be
reattached. Be sure that when vane is partially closed the
entering air will be spun in the direction of impeller rotation.
3. For installation of new quadrant, using the dimensions in
Figure4,positionquadrant(item2or2A)tothehousingside.
Weldquadranttothehousingframe(orhousingside).
4. Drillahole inthefanhousingsidetomatchthediameterof
control rod (item 3).
5. Reassemblebearingsupportframeandboltittofanhousing
as shown in Figure 1.
6. Reassemblethebearing.
7. Repeatsteps1,2,4,5and6ontheothersideofthefan.
8. Removeblockingunderthefanimpellerandchecktobesure
the impeller turns freely. Adjust bearing position or inlet vane
positionasrequired.Tightenbearingfasteners.
9. Assembletheremainingpartsofcontrolsystemaccordingto
Figure 2. Adjust position of connecting links as required to
enable both vanes to open/close smoothly and uniformly.
Threadedlinkagerods(item6)mayhavetobecuttorequired
length.
10. Welded threaded linkage rod housing to hex nuts (item 14).
Spot weld the control rod to vane handle and control linkage
bar.
11. Reinstall the drive, guards, inlet screens, access door hardware,
etc.
Figure 1. BC, BAF DWDI Fan With Nested Inlet Vanes
©2004 – 2023 Twin City Fan Companies, Ltd.
IM-494
January 2023
Nested Inlet Vanes
BC, BAF DWDI
INSTALLATION, OPERATION & MAINTENANCE MANUAL
2 Twin City Fan & Blower Installation and Maintenance Manual: IM-494
Figure 2. Nested Inlet Vane Control System for DWDI BC, BAF Fans
NOTES:
1. Items8,9,10and11areusedforfansizes245thru890.
2. Item8Aisusedforfansizes165thru222.
3. Item 2 is used for nonrotatable housing design and is to be welded to the fan housing frame.
4. Item 2A is used for rotatable housing design and is to be welded on the fan housing.
5. Bearings are to be mounted on the outside of the fan housing.
6. Items7and14areusedforfansizes600andlarger.
7. Measure threaded linkage rod length to fit.
ITEM DESCRIPTION
01 VANEHANDLE
02 QUADRANT
03 CONTROLROD
04 CONTROLRING
05 CONTROLLINKAGEBAR
06 THREADEDLINKAGEROD
07 THREADEDLINKAGERODHSG.
08 CONTROLRINGCLIP
09 UNISTRUT
10 UNISTRUTCLAMPINGNUT
11 HEXNUT
12 BALLJOINT
13 HEXNUT
14 HEXNUT
15 HEXNUT
16 HEXNUT
17 HEXBOLT
18 NEXNUT
19 FLANGEBEARING
20 SPRINGLOCKWASHER
21 FLATWASHER
22 HEXHEADSCREW
23 SQUAREHEADSETSCREW
24 SQUAREHEADSETSCREW
Twin City Fan & Blower Installation and Maintenance Manual: IM-494 3
Figure 3. Control Ring Position
NOTES:
1. ForPOS.R:
CW fan handle down is open.
CCW fan handle down is closed.
ForPOSL:
CW fan handle down is closed.
CCW fan handle down is open.
2. Handle location on inlet side of fan.
3. Reference of AC-13460.
DBD TAU BAUTHD TAD UBD BHD
A
A
RRRR
LR
LR
L
L
L
9.75
PIVOT
1.00
45°
45°
HORIZ.
CENTER-
LINE
HOUSING VERT.
CENTERLINE
Figure 4. Nested Inlet Vane Handle Location For Non-rotatable Fans
NOTES:
1. ForPOS.R:
CW fan handle down is open.
CCW fan handle down is closed.
ForPOSL:
CW fan handle down is closed.
CCW fan handle down is open.
2. AlldimensionsarereferencestoAC-13459.
NESTED INLET VANE DIMENSION “A”
FAN HANDLE LOCATION SWSI DWDI
SIZE DBD TAD THD TAU UBD BAU BHD CL I CL II CL III CL IV CL I CL II CL III
BCS 17 BCS 22,26
165 L L R R R R L 12.88 12.88 12.88 12.88 12.88 12.88 12.88
182 L L R R R R L 13.75 13.75 14.25 14.75 13.75 13.75 14.25
200 L L R R R R L 14.75 14.75 15.25 15.75 14.75 14.75 15.25
222 L L R R R R L 16.38 16.38 16.88 16.88 16.38 16.38 16.88
245 L R R R R L L 17.50 17.50 18.00 18.00 17.50 17.50 18.00
270 L R R R R L L 18.75 18.75 19.25 19.75 18.75 18.75 19.50
300 L R R R R L L 21.25 21.25 21.75 21.75 21.25 21.25 22.00
330 R R R R R L L 22.75 22.75 23.25 23.50 22.75 23.00 23.50
365 R R R R R L L 24.75 24.75 25.50 25.50 24.75 25.00 25.50
402 R R R R L L L 27.00 27.00 27.25 27.25 27.00 27.25 27.50
445 R R R R L L L 29.00 29.00 29.25 29.75 29.25 29.25 29.50
490 R R R R L L L 31.50 31.75 31.75 32.50 31.75 31.75 32.00
542 R R R R L L L 34.25 34.50 34.50 35.25 34.50 34.75 34.75
600 R R R R L L L 37.50 37.50 38.25 38.25 37.50 37.75 38.50
660 R R R R L L L 41.00 41.00 41.25 41.75 41.25 41.25 41.50
730 R R R R L L L 45.00 45.25 45.50 46.00 45.25 45.50 45.75
807 R R R R L L L 48.75 49.00 49.75 50.00 49.00 49.25 50.00
890 R R R R L L L 54.50 54.50 55.25 55.50 54.75 55.00 55.50
982 R R R R L L L 62.25 62.50 58.50 58.75 62.50 62.75 58.75
OPPOSITEDRIVESIDESHOWN
Figure 5. Nested Inlet Vane Handle Location For Rotatable Fans
CWROTATIONINLETSIDESHOWN
IFDWDI,OPPOSITEDRIVESIDE.
NOTES:
1. ForPOS.R:
CW fan handle down is open.
CCW fan handle down is closed.
ForPOSL:
CW fan handle down is closed.
CCW fan handle down is open.
2. For split housing, consult factory.
FAN
SIZE 165 182 200 222 245 270 300 330 365
A 11.25 12.25 13.50 14.62 15.88 17.50 19.06 20.44 22.88
B1.69 1.69 1.69 21.9 2.19 2.19 2.69 2.69 2.69
TWIN CITY FAN & BLOWER | WWW.TCF.COM
5959 Trenton Lane N | Minneapolis, MN 55442 | Phone: 763-551-7600 | Fax: 763-551-7601
Twin City Fan
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