HomeMy WebLinkAbout23 34 16 - Centrifugal HVAC FansBEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP CENTRIFUGAL HVAC FANS
STANDARD SPECIFICATIONS 23 34 16 – PAGE 1 OF 5
NOVEMBER 2, 2012
SECTION 233416 CENTRIFUGAL HVAC FANS
PART 1 GENERAL
1.1 SUBMITTALS
A. Product Data: Provide the following:
1. Include rated capacities, furnished specialties, and accessories for each
fan.
2. Certified fan performance curves with system operating conditions
indicated.
3. Certified fan sound5power ratings.
4. Motor ratings and electrical characteristics, plus motor and electrical
accessories.
5. Material thickness and finishes, including color charts.
6. Dampers, including housings, linkages, and operators.
7. Vibration Isolators
8. Operation and Maintenance Data: For centrifugal fans to include in
emergency, operation, and maintenance manuals.
PART 2 PRODUCTS
2.1 PERFORMANCE REQUIREMENTS
A. AMCA Compliance:
1. Comply with AMCA performance requirements and bear the AMCA5
Certified Ratings Seal.
2. Operating Limits: Classify according to AMCA 99.
B. Electrical Components, Devices, and Accessories: Listed and labeled as
defined in NFPA 70, by a qualified testing agency, and marked for intended
location and application.
2.2 INLINE CENTRIFUGAL FANS (BELT DRIVE)
A. Basis5of5Design Product: Subject to compliance with requirements, provide
Loren Cook Model SQI or a comparable product by one of the following:
1. Chicago Blower Corporation.
2. Cincinnati Fan.
3. New York Blower Company (The).
B. Description:
1. Factory5fabricated, 5assembled, 5tested, and 5finished, belt5driven
centrifugal fans consisting of housing, wheel, fan shaft, bearings, motor,
drive assembly, and support structure.
2. Deliver fans as factory5assembled units, to the extent allowable by
shipping limitations.
3. Factory5installed and 5wired disconnect switch.
C. Disconnect Switches:
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP CENTRIFUGAL HVAC FANS
STANDARD SPECIFICATIONS 23 34 16 – PAGE 2 OF 5
NOVEMBER 2, 2012
1. NEMA rated: 1
2. Positive electrical shut5off.
D. Housings:
1. Formed panels to make curved5scroll housings with shaped cutoff.
2. Panel Bracing: Steel angle5 or channel5iron member supports for
mounting and supporting fan scroll, wheel, motor, and accessories.
3. Horizontally split, bolted5flange housing.
4. Spun inlet cone with flange.
5. Outlet flange.
6. Constructed of steel and coated with permatector.
7. Housing and bearing supports shall be constructed of welded steel
members to prevent vibration and to rigidly support the shaft and bearing
assembly balancing up to a minimum of 10 horsepower.
E. Housing Supports and Drive Frame:
1. Housing supports are constructed of structural steel with formed flanges.
2. Drive frame is welded steel which supports the shaft and bearings and
reinforcement for the housing.
3. Pivoting motor plate with adjusting screws to make belt tensioning
operations.
4. Prepunched mounting holes for installation.
5. Drive frame is coated with Permatector.
F. Backward5Inclined Wheels:
1. Non5overloading, backward inclined centrifugal wheel.
2. Constructed of aluminum.
3. Single5width5single5inlet construction with curved inlet flange, backplate,
and fastened to shaft with set screws.
4. Welded or riveted to flange and backplate; cast5iron or cast5steel hub
riveted to backplate.
5. Statically and dynamically balanced.
6. The wheel cone and fan inlet will be matched and shall have precise
running tolerances for maximum performance and operating efficiency.
G. Grease5Lubricated Shaft Bearings:
1. Self5aligning, pillow5block5type, tapered roller bearings with double5
locking collars and two5piece, cast5iron housing.
2. Ball5Bearing Rating Life: L50 at 200,000 hours.
H. Belt Drives:
1. Factory mounted, with adjustable alignment and belt tensioning.
2. Fan Pulleys: Cast iron or cast steel with split, tapered bushing;
dynamically balanced at factory. Keyed and securely attached to wheel
and motor shafts.
3. Motor Pulleys: Adjustable pitch for use with motors through 5 hp; fixed
pitch for use with larger motors. Select pulley so pitch adjustment is at the
middle of adjustment range at fan design conditions.
4. Belts: Oil resistant, nonsparking, and nonstatic; matched sets for multiple
belt drives.
5. Readily accessible for maintenance.
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP CENTRIFUGAL HVAC FANS
STANDARD SPECIFICATIONS 23 34 16 – PAGE 3 OF 5
NOVEMBER 2, 2012
6. Belt Guards: Fabricate to comply with OSHA and SMACNA requirements
of diamond5mesh wire screen welded to steel angle frame or equivalent,
prime coated. Secure to fan or fan supports without short circuiting
vibration isolation. Include provisions for adjustment of belt tension,
lubrication, and use of tachometer with guard in place.
7. Motor Mount: Adjustable for belt tensioning.
I. Motors:
1. Motor enclosures: Open dripoff.
2. Motors are permanently lubricated, sealed, heavy duty ball bearing type
furnished at the specific voltage, phase, and enclosure.
J. Accessories:
1. Access for Inspection, Cleaning, and Maintenance: Comply with
requirements in ASHRAE 62.1.
2. Companion Flanges: Rolled flanges for duct connections of same
material as housing.
3. Galvanized frames with prepunched mounting holes.
4. Integral backdraft dampers.
5. Balanced for minimal resistance to flow.
6. Inlet Screens: For non ducted fans; grid screen of same material as
housing.
7. Vibration isolators.
2.3 INLINE CENTRIFUGAL FANS (DIRECT DRIVE)
A. Basis5of5Design Product: Subject to compliance with requirements, provide
Loren Cook Model SQI or a comparable product by one of the following:
1. Chicago Blower Corporation.
2. Cincinnati Fan.
3. New York Blower Company (The).
B. Description:
1. Factory5fabricated, 5assembled, 5tested, and 5finished, direct5driven
centrifugal fans consisting of housing, wheel, fan shaft, bearings, motor,
drive assembly, and support structure.
2. Deliver fans as factory5assembled units, to the extent allowable by
shipping limitations.
3. Factory5installed and 5wired disconnect switch.
C. Disconnect Switches:
1. NEMA rated: 1
2. Positive electrical shut5off.
D. Housings:
1. Formed panels to make curved5scroll housings with shaped cutoff.
2. Panel Bracing: Steel angle5 or channel5iron member supports for
mounting and supporting fan scroll, wheel, motor, and accessories.
3. Horizontally split, bolted5flange housing.
4. Spun inlet cone with flange.
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP CENTRIFUGAL HVAC FANS
STANDARD SPECIFICATIONS 23 34 16 – PAGE 4 OF 5
NOVEMBER 2, 2012
5. Outlet flange.
6. Constructed of steel and coated with permatector.
7. Housing and bearing supports shall be constructed of welded steel
members to prevent vibration and to rigidly support the shaft and bearing
assembly balancing up to a minimum of 10 horsepower.
E. Housing Supports and Drive Frame:
1. Housing supports are constructed of structural steel with formed flanges.
2. Drive frame is welded steel which supports the shaft and bearings and
reinforcement for the housing.
3. Prepunched mounting holes for installation.
4. Drive frame is coated with Permatector.
F. Backward5Inclined Wheels:
1. Non5overloading, backward inclined centrifugal wheel.
2. Constructed of aluminum.
3. Single5width5single5inlet construction with curved inlet flange, backplate,
and fastened to shaft with set screws.
4. Welded or riveted to flange and backplate; cast5iron or cast5steel hub
riveted to backplate.
5. Statically and dynamically balanced.
6. The wheel cone and fan inlet will be matched and shall have precise
running tolerances for maximum performance and operating efficiency.
G. Motors:
1. Motors are permanently lubricated, sealed, heavy duty ball bearing type
furnished at the specific voltage, phase, and enclosure.
H. Accessories:
1. Access for Inspection, Cleaning, and Maintenance: Comply with
requirements in ASHRAE 62.1.
2. Companion Flanges: Rolled flanges for duct connections of same
material as housing.
3. Galvanized frames with prepunched mounting holes.
4. Integral backdraft dampers.
5. Balanced for minimal resistance to flow.
6. Inlet Screens: For non ducted fans; grid screen of same material as
housing.
7. Vibration isolators.
8. Provide variable speed controller.
PART 3 EXECUTION
3.1 INSTALLATION
A. Install centrifugal fans level and plumb.
B. Disassemble and reassemble units, as required for moving to the final
location, according to manufacturer's written instructions.
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP CENTRIFUGAL HVAC FANS
STANDARD SPECIFICATIONS 23 34 16 – PAGE 5 OF 5
NOVEMBER 2, 2012
C. Lift and support units with manufacturer's designated lifting or supporting
points.
D. Equipment Mounting: Install continuous5thread hanger rods and spring
vibration hangers with vertical5limit stop of size required to support weight of
centrifugal fans.
E. Install units with clearances for service and maintenance.
3.2 FIELD QUALITY CONTROL
A. Testing Agency: Engage a qualified testing agency to perform tests and
inspections.
B. Manufacturer's Field Service: Engage a factory5authorized service
representative to test and inspect components, assemblies, and equipment
installations, including connections.
C. Perform the following tests and inspections[ with the assistance of a factory5
authorized service representative]:
1. Verify that shipping, blocking, and bracing are removed.
2. Verify that unit is secure on mountings and supporting devices and that
connections to ducts and electrical components are complete. Verify that
proper thermal5overload protection is installed in motors, starters, and
disconnect switches.
3. Verify that cleaning and adjusting are complete.
4. Disconnect fan drive from motor, verify proper motor rotation direction,
and verify fan wheel free rotation and smooth bearing operation.
Reconnect fan drive system, align and adjust belts, and install belt guards.
5. Adjust belt tension.
6. Adjust damper linkages for proper damper operation.
7. Verify lubrication for bearings and other moving parts.
8. Verify that manual and automatic volume control and fire and smoke
dampers in connected ductwork systems are in fully open position.
9. See Division 23 Section "Testing, Adjusting, and Balancing For HVAC" for
testing, adjusting, and balancing procedures.
10. Remove and replace malfunctioning units and retest as specified above.
D. Prepare test and inspection reports.
END OF SECTION 23 34 16