Twin City SWSI Nested Inlet Vanes - ES-394 - Manual

1 TCF&B Engineering Supplement ES394
Removing Old Cone or Vane
See Figure 2 for identification of all items referenced.
For Fan Arrangements 1, 4, 9 and 10:
1. Shut off fan and lock out electrical power.
2. Remove inlet screens if applicable.
3a.
For Removing Old Inlet Cone — Loosen fasteners at
periphery of inlet cone and remove old cone.
3b. For Pre-1981 Style Inlet Vane Removal — Remove
hardware from old vane which attaches it to the
housing. Remove control link and old inlet vane.
3c. For Post-1981 Style Inlet Vane Removal — Remove
nut (item 14) and pull connecting arm out of the
way. Loosen fasteners which hold inlet vane to the
fan housing, and remove old inlet vane.
For Arrangements 3 and 7:
1. Shut off fan and lock out electric power.
2. Remove inlet screens if applicable. Release belt ten-
sion.
3. Clean and remove rust from sections of fan shaft
which extend through fan inlet bearings. File smooth
any burrs. Remove bearing bolts and raise shaft
enough to take weight off bearing.
4. Working through fan outlet or through access door,
block under periphery of fan wheel so that fan
housing supports the fan wheel.
5a. For Fan With Setscrew Locking Collars — Loosen
setscrews in fan inlet 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.
5b. 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.
6a. For New Installation — Loosen fasteners which hold
inlet cone and bearing support frame to the fan
housing side. Remove old inlet cone and bearing
support frame.
6b. For Pre-1981 Style Replacement — Remove hard-
ware from old vane which attaches it to the housing
side. Remove control arm (or drive link). Loosen
fasteners which hold the inlet cone and bearing
support frame to the housing side, then remove old
inlet vane and bearing support frame.
6c. For Post-1981 Style Replacement — Remove nut
(item 14) and pull connecting arm out of the way.
Loosen fasteners which hold the inlet vane and
bearing support frame to the housing side, and
remove the inlet vane and bearing support frame.
Assembling Nested Inlet Vane
For Fan Arrangements 1, 4, 9 & 10:
1. Using Figure 2 as a guide, assemble items 5
through 15 to the inlet vane. Threaded linkage rod
(item 6) may have to be cut to required length.
2. Center inlet vane in location of old vane or cone, and
rotate 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 wheel rotation.
3. For installation of new quadrant, using the dimensions
in Figure 4, position quadrant (item 2 or 2A) to the
housing side. Drill a hole in the fan housing side to
match outside diameter of control rod housing (item
4).
4. Weld quadrant (item 2 or 2A) to housing frame (or
housing side).
5. Assemble the remaining parts of control system
according to Figure 2. Adjust position of connecting
links as required to allow the vane to open and close
smoothly.
6. Weld threaded linkage housing to hex nuts (item 12).
Spot weld the control rod to vane handle and control
linkage bar.
a©1998 Twin City Fan & Blower
Figure 1. BC, BAF, BCS Fan With Nested Inlet
ES-394
May 1998
BC, BAF, BCS SWSI
Nested Inlet Fans
INSTALLATION, OPERATION & MAINTENANCE MANUAL