2
7. place adjusting nut and locking nut on threaded rod
near fan mounting bracket
8. alternately rotate adjusting nut at each mounting
location until the fan weight is uniformly transferred to
the isolators. Remove bracing.
Floor Mounted Spring Isolators
1. Mount fan and motor on isolation base or rails (if
supplied).
2. Elevate fan (or isolation base) to operating height and
insert blocks to hold in position.
3. Position isolators under the fan and vertically align by
inserting leveling bolt through mounting holes in the
fan or the base. The isolator must be installed on a
level surface.
4. Adjust the isolators by turning the leveling nut counter
clockwise several turns at a time alternately on each
isolator until the fan weight is transferred onto the
isolators and the fan raises uniformly off the blocks.
Then remove the blocks.
5. Turn lock nut onto leveling bolt and secure firmly in
place against the top of the mounting flange or frame.
6. Secure isolators to mounting surface.
Floor Mounted Rubber-In-Shear (RIS) Isolators
1. Mount fan and motor on an isolation base or rails (if
supplied).
2. Elevate fan to provide room to insert isolators between
the base and foundation and block in position.
3. Position isolators under fan and secure bolts.
4. Remove blocks and allow fan to rest on floor. Isolators
must be installed on a level surface (leveling should
not be required).
5. Secure isolators to mounting surface.
Rubber-In-Shear Ceiling Isolators
Ceiling Mounted Spring Isolator
Figure 1 - Ceiling Mount Isolators
Figure 2 -Floor Mount Isolators
Rubber-In-Shear Isolator
Spring Isolator
Foundation
This fan requires a strong, level foundation of reinforced
poured concrete. A correctly designed concrete foundation
provides the best means for mounting floor units. The
foundation’s size is determined by fan size and
arrangement, motor size and position, and the specific
location of the installation.
Use the following guidelines to calculate foundation size:
• The overall dimensions of the foundation should
extend at least 6 inches beyond the outline of the fan
and its motor.
• The weight of the foundation should be 2 to 3 times the
weight of the unit and its motor.
Isolation
NOTICE!
Although a certain amount of vibration is
inherent in operating centrifugal fans, extreme
vibration is a serious problem that may cause
structural and mechanical failure.
Isolation Base
To prevent vibration and noise from being transferred to
the building isolators are recommended. Arrangement 1, 2,
& 3 (CA or CF) fans require an isolation base to effectively
isolate the fan system which includes the fan, base, motor,
drive, guards, etc. Bases must have sufficient rigidity to
resist belt pull and prevent drive distortion which can lead to
excessive belt and bearing wear; its perimeter should
contain all base angles and rotating parts. Arrangement 9
or 10 fans (CA, CF, and CP) above size 270 require
isolation rails. Please consult factory for isolation of
arrangement 9 fans due to the potential of uneven loading
caused by the motors and drives. Isolators should be
located between the fan system and the support structure.
Ceiling Mounted Spring and Rubber-in-Shear (RIS)
Isolators
1. Mount fan on isolation base or rails
2. Elevate fan to operating height and brace
3. Attach threaded rod to overhead support structure
directly above each mounting hole. Rod should extend
to within a few feet of fan.
4. Attach isolator to end of threaded rod using a nut on
each side of isolator bracket
5. Insert another section of threaded rod through the fan
mounting hole and isolator
6. Attach two nuts to threaded rod isolator
The attachment of roof mounted fans to the roof curb
as well as the attachment of roof curbs to the building
structure must exceed the structural requirements
based on the environmental loading derived from the
applicable building code for the site. The local code
official may require variations from the recognized
code based on local data. The licensed engineer of
record will be responsible for prescribing the correct
attachment based on construction materials, code
requirements and environmental effects specific to
the installation.
Failure to follow these instructions could result in
death or serious injury.
Summary of Contents for CA DWDI
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