New York Blower IM-220 Operating and maintenance manual

FAN OUTLET AND INLET BOX DAMPERS
INSTALLATION
Dampers are designed and manufactured with flanges and
mounting holes to match the fan’s outlet flange. Gasketing may
be used between the flanges as required.
Standard construction of nyb fan outlet dampers requires
dampers to be mounted with the control arm and linkage posi-
tioned on the inlet side of the fan with the control arm pointing
toward the fan. (Figure 1)
For manual operation of the damper, the locking bolt should be
loosened sufficiently to permit movement of the control arm to
the desired position. The locking bolt should be retightened to
maintain the desired position.
For electric, hydraulic, pneumatic or mechanical operation of
the damper, the locking bolt should be removed from the con-
trol arm. This allows freedom of movement for the damper and
operator linkage.
Figure 1
MAINTENANCE
Routine maintenance of dampers should include periodic
inspection of the vanes and rods in the airstream to determine
if replacement is necessary due to airstream corrosion or abra-
sion.
Vane rod bearings and linkage bushings should be inspected
for looseness or wear and replaced when necessary. Standard
dampers may require occasional lubrication of friction points
with 30W oil.
Optional flanged ball bearings with grease fittings should be
lubricated with lithium base NLGI Grade No. 2 grease every six
(6) months during typical operation.
Optional stuffing box packing should be repacked with 1/8”
diameter graphite packing when leakage is excessive.
OPERATION
Air moving across a damper exerts a considerable amount of
force on the damper vanes. Vanes tend to close as a result of
this force. A locking bolt is provided on the control arm to hold
the vanes in the desired position, (Figure 2). See separate
Catalog Sheet for Outlet Dampers for Centrifugal Fans for cal-
culating required operating torque.
Figure 2
SHIPPING
Fan outlet dampers are shipped mounted on fans whenever pos-
sible. Shipment on separate skids may be required when the size
of the fan/damper combination poses shipping difficulties.
RECEIVING AND INSPECTION
Unpack and inspect the damper. Loosen the control arm lock-
ing bolt and operate the damper from the closed to open posi-
tions several times to insure that the vanes and linkage move
freely and do not bind. Any visible sign of damage should be
noted on the Bill of Lading.
HANDLING AND STORAGE
Damper should be lifted by the external case only, never by the
vanes, linkage, control plate or control arm.
Whenever possible, dampers should be stored in clean, dry
locations to prevent rust and corrosion. If outdoor storage is
necessary, damper should be as well protected as possible
against the elements.
If long term storage is required, routine maintenance proce-
dures should be followed and the damper should be modulated
periodically to insure free movement of vanes and linkage.
Control
Plate
Air
Flow
INSTALLATION
MAINTENANCE,
OPERATING
INSTRUCTIONS
IM-220

Page 2
STANDARD DAMPER CONSTRUCTION
Figure 3
Exploded view of parallel blade outlet dampers . . . airflow is opposite for inlet box dampers.
Figure 4
Exploded view of opposed blade outlet dampers.
Parallel Blade
1. Vane rod sub-assembly.*
2. Vane control rod sub-assembly.*
3. Damper case sub-assembly.
4. 5/8” aluminum bushing to 500°F.
stainless steel bushing 501°F. to 800°F.
and 801°F. to 1000°F. dampers.
5. Linkage arm sub-assembly.
6. Parallel blade connector bar.
7. 1/2” bronze bushing.
8. 1/2” retaining ring.
* Stainless steel construction required for
801°F. to 1000°F. dampers.
Opposed Blade
9. Control arm sub-assembly.
10. 1/2” stainless steel flat washer.
11. Control plate sub-assembly.
12. 1/2” stainless steel lock washer.
13. 1/2” – 13 x 1½” stainless steel hex bolt.
14. Even vane connector bar sub-assembly.
15. Odd vane connector bar sub-assembly.
16. Opposed blade link bar.

Page 3
OPTIONAL CONSTRUCTION FEATURES
Figure 5
Exploded view stuffing box option.
Note:
Control arm, linkage, bearing,
bushings, and hardware are
dictated by damper blade con-
figuration. Refer to Figure 3 for
parallel blade damper or Figure
4 for opposed blade damper
linkage detail.
Recommended spare parts
packages for ball bearings
dampers include:
4. Case bushings
7. Bronze bushings
8. Retaining rings
20.Flanged ball bearings
Ball Bearing
19. 1/4” flat washer.
20. 5/8” flanged ball bearing. (3/4”
on Size 44 - 73 AcF/PLR
DWDI only.)
21. 1/4” lock washer.
22. 1/4” - 20 x 1” hex bolt.
23. Bearing heat sink (501°F to
800°F. construction only).
24. 1/4” non-metallic washer
(501°F to 800°F. construction
only).
Case side not shown has parts
19, 20, 21, and 22 for each vane
rod end.
Bearing mounting posts
welded to case and
control plate
Threaded collar welded to
damper-case
Parts List
Stuffing Box
17. 1/8” diameter graphite packing.
18. Packing bushing.
Not shown: welded caps installed on
damper case (opposite of link-age
side) to enclose ends of vane rods.

Page 4
REPLACEMENT PARTS
Dampers can be disassembled in the field by removing
control plate, control arm, linkage, case side, and vane/rod
sub-assemblies in that order without removing the remainder
of the damper case from the fan or ductwork.
Only ordinary hand tools are required to replace vanes, bear-
ings and bushings.
Exploded views and parts identification are shown in Figure 3
through Figure 6 for various types of dampers and optional
construction features.
Required Ordering Information
Fan Size and Type:________
Rotation: _________
Damper Type: ____________
Optional Construction Features:______________
nyb File (Shop) Number: ___________
INLET BOX DAMPERS
SHIPPING
Inlet boxes and inlet box dampers are normally shipped inde-
pendently on separate skids, (factory mounting may be avail-
able in certain circumstances).
Refer to page 1 for Receiving and Inspection, Handling and
Storage, Maintenance and Operational Instructions.
INSTALLATION
Inlet box dampers should be mounted on inlet boxes with the
control arm and linkage positioned on the outside of the inlet
box, (side furthest from fan inlet) with the control arm pointing
toward the inlet box, (Figure 7).
The New York Blower Company7660 Quincy Street Willowbrook, Illinois 60527-5530 Form 807 GAW
Figure 7