Section 15605 HVAC: EQUIPMENT

Section 15605

HVAC: EQUIPMENT

PART 1 - GENERAL

1.1 THE REQUIREMENT A. Section Includes:

1. Heating, ventilating, and cooling equipment.

B. Related Specification sections include but are not necessarily limited to:

1. Division 01, Additional General Requirements

2. Section 11005, Equipment: Basic Requirements

3. Section 15890, HVAC: Ductwork

4. Section 15970, Instrumentation and Control for HVAC Systems

5. Section 16220, Electric Motors

6. Section 16442, Control Panels

1.2 QUALITY ASSURANCE

A. Referenced Standards:

1. Air Movement and Control Association (AMCA)

2. Air Conditioning and Refrigeration Institute (ARI)

3. American Society of Heating, Refrigerating and Air Conditioning Engineers

(ASHRAE):

HVAC Applications Handbook, Chapter entitled "Sound and Vibration Control."

20 Methods of Testing for Rating Remote Mechanical-Draft

Air-Cooled Refrigerant Condensers

52.2, Method of Testing General Ventilation Air-Cleaning

Devices for Removal Efficiency by Particle Size

4. Canadian Standards Association (CSA)

5. National Electrical Manufacturers Association (NEMA):

250 Enclosures for Electrical Equipment (1000 Volts

Maximum)

6. National Fire Protection Association (NFPA):

70 National Electrical Code (NEC).

7. National Roofing Contractors Association (NRCA)

8. Underwriters Laboratories, Inc. (UL):

507 Standard for Electric Fans

9. Building Code:

a. International Code Council (ICC):

International Building Code and associated standards, 2009 Edition including all State of California 2010 amendments, referred to herein as California Building Code.

B. Miscellaneous:

1. Gauge thickness specified herein shall be manufacturer's standard gauge for steel and Brown and Sharpe gauge for non-ferrous metals.

2. Corrosion protection of equipment to be as specified herein.

1.3 SUBMITTALS

A. Shop Drawings:

1. Submittals shall be made in accordance with the General Requirements, Additional General Requirements and as specified herein.

2. Fabrication and/or layout drawings.

3. Product technical data including:

a. Acknowledgement that products submitted meet requirements of standards referenced.

b. Manufacturer's installation instructions. c. Wiring diagrams.

d. Control diagrams.

e. Manufacturer's catalog cuts and technical data. f. Corrosion-protection information.

g. Fan curves. h. Sound data.

i. Vibration isolation.

j. Control description.

k. Performance data on all equipment.

4. Certifications:

a. Provide certification of thickness of corrosion-protection coating. B. Operation and Maintenance Manuals:

1. See Section 01783, Vendor Equipment Manuals, for requirements for:

a. The mechanics and administration of the submittal process. b. The content of Operation and Maintenance Manuals.

PART 2 - PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. Subject to compliance with the Contract Documents, the following manufacturers are acceptable:

1. Vibration isolation assemblies:

a. Mason.

b. Vibration Mounting and Controls Co. c. Or Equal

2. Corrosion-protective coatings:

a. Heresite and Chemical Co.; "Heresite."

b. Technical Coating Division of Southern Anodizing Co., Inc.; "Technicoat." c. Or Equal

3. Cooling coils - water:

a. Carrier.

b. McQuay. c. Or Equal

4. Heating coil - electric:

a. Carrier.

b. McQuay. c. Or Equal

5. Packaged air-handling units:

a. McQuay. b. Carrier.

c. Dunham-Bush. d. Or Equal

6. Packaged roof-top AC units:

a. McQuay. b. Carrier.

c. Or Equal

7. Mixed flow inline fans:

a. Loren Cook. b. Aerovent.

c. Or Equal

8. Roof-mounted centrifugal exhaust fans:

a. Loren Cook. b. Greenheck.

c. Penn Ventilator Co., Inc. d. Or Equal

9. Roof-mounted propeller-type supply air fans:

a. Loren Cook. b. Aerovent.

c. Penn Ventilator Co., Inc. d. Or Equal

10. Toilet room exhaust fans:

a. Penn Ventilator Co., Inc. b. Loren Cook.

c. Or Equal

11. Unitary split system air conditioning:

a. York.

b. Sanyo.

c. Or Equal

2.2 GENERAL

A. All Manufactured Units:

1. Comply with Section 11005, Equipment: Basic Requirements.

2. Factory wired and assembled.

3. Use fasteners made of same material as unit.

4. Fabricate motor assemblies and unit housings with vibration isolation assemblies:

a. Type: As per Table 42, Chapter 47, ASHRAE HVAC Applications Handbook. B. All manufactured units shall be constructed with corrosion-resistant materials or have

corrosion-resistant coating.

1. Type:

a. Corrosion-resistant materials:

1) Aluminum.

2) Stainless steel.

3) FRP.

b. Corrosion-resistant coating:

1) Phenolic-based coating:

2) 3 mil minimum dry thickness, air-dried coating, for surfaces exposed to temperatures less than 150 degrees F.

3) 5 mil baked-on coating for heat transfer surfaces and surfaces exposed to temperatures greater than 150 degrees F.

4) Factory applied.

2.3 MANUFACTURED UNITS A. Equipment Coils:

1. Cooling coils - direct expansion:

a. ARI certified. b. Material:

1) Aluminum.

2) Copper with aluminum fins.

c. Fin spacing: Minimum 80 fins per foot.

d. Minimum standard operating limit: 250 pounds per inch.

2. Cooling coils - water:

a. ARI certified. b. Material:

1) Aluminum.

2) Copper with aluminum fins for use in administration units only. c. Fin Spacing: Minimum 80 fins per foot.

d. Minimum Standard Operating Limit: 200 pounds per foot.

e. Equip with vent, drain and condensate connections. f. Size and capacity as scheduled on Drawings.

3. Heating coil - electric:

a. ARI certified.

b. 80 percent nickel, 20 percent chromium elements. c. Maximum heating density: 35 watts/square inch.

d. Built-in thermal protection.

e. Airflow switch.

f. Built-in circuit fusing.

g. Control voltage transformer. h. Terminal block.

i. Magnetic contactor.

j. Fused disconnect switch.

k. Step controller as required by instrumentation. l. Single point electrical connection.

m. Size and capacity as scheduled on Drawings. B. Packaged Air-Handling Units:

1. ARI certified.

2. UL listed.

3. Materials:

a. Casing: Heavy gauge steel. b. Framework: Steel angle.

c. Pan Insulation: Foam-in-place insulation.

d. Casing Insulation: 1 inch, 3/4 pound fiberglass blanket.

4. Casing:

a. Sectionalized construction. b. Removable access panels.

c. Insulated weatherproof casing.

5. Supply fan section:

a. Fans:

1) Double-width, double-inlet, multiblade centrifugal type.

2) Statically and dynamically balanced.

3) Solid shafts.

4) Forward curved fans.

5) Die formed fan housing.

6) 200,000-hour grease lubricated ball-bearings.

b. Provide one standby fan in cabinet in addition to the number of duty fans.

6. Return air section:

a. Return fans:

1) Double-width, double-inlet, centrifugal type.

2) Forward curve.

3) Solid steel shaft.

4) 200,000-hour relubricative ball-bearings.

b. Provide one standby fan in cabinet in addition to the number of duty fans. c. Fan motors:

1) See Section 16220, Electric Motors.

2) Relubricative ball-bearings.

3) Adjustable base.

d. Driver and driven sheaves:

1) Keyed hub type.

2) Drive Sheaves: Fixed pitch diameter.

3) Driver:

a) Shipped with variable pitch diameter sheave.

b) Fixed pitch diameter size based on approved test and balance reports.

4) V-belt drives sized for 150 percent motor horsepower. e. Isolated fan assembly.

f. Designed to form a plenum.

7. Motors: See Section 16220, Electric Motors.

a. Constant speed.

8. V-belts and drives sized for 150 percent motor capacity.

9. Cooling coil section:

a. Water: See paragraph(s) in Article 2.3, Equipment Coils.

10. Evaporative cooler section (15LAHU965):

a. Direct evaporative section for installation in air handling unit.

b. Materials:

1) Interior of cabinet: 16 gauge stainless steel.

2) Sump: 16 gauge stainless steel with all seams continuously welded.

3) All fasteners and other metal parts shall be 304 stainless steel.

4) Media: Cellulose fiberglass impregnated with insoluble, anti-rot salts and rigidifying saturants.

5) Water distribution piping: Seamless copper tubing.

6) Pump strainer: Perforated 316 stainless steel. c. Performance schedule: Min 90 percent efficient.

d. Cabinet.

1) Flanged duct connections on cabinet.

2) Accessibility to upstream and downstream of water distribution pans and fan.

3) Roof mounting system for horizontal discharge as applicable.

4) Water reservoir covered with waterproof asphalt base undercoat. e. Media

1) Minimum saturation efficiency of 90 percent with no water carryover and max pressure drop of 0.10 inch W.C. at design conditions.

2) Noncorrosive and impervious to fungus growth media.

3) 12 inches thick.

4) Minimum 123 square feet of surface per square foot.

5) Meet NFPA-90A smoke and fire regulations.

f. Water circulation pump and distribution system:

1) Direct driven, end-suction centrifugal pump. a) Pump HP: 1/4.

2) Clog-free, self-cleaning spray nozzles.

3) I/2 inch float-type water makeup valve.

4) 2-inch overflow and drain provisions on distribution pan.

5) Automatic drain valve for bleed-off capability, only when draining sump and automatic fill valve to close when outside temperature falls below 40 degrees F.

6) Low water cutoff.

7) Pump controlled by room thermostat.

11. Filter section:

a. Filters: See Section 15890, HVAC: Ductwork. b. Non-insulated cabinet.

c. Access doors for filter removal.

12. Insulated drain pan with drain connections.

13. Control panel:

a. Local controls as defined in Section 15970, Instrumentation and Control for

HVAC Systems.

b. Controls and safety devices, factory-wired, in accordance with NFPA 70 requirements.

c. Provide minimum 3-inch space between each control component on face of panel.

d. Panel shall conform to Section 16442, Control Panels. e. NEMA 4X 316 stainless steel construction.

f. Control panel shall have a main circuit breaker with an external operating handle. The circuit breaker shall be lockable in the off position. Control panel shall contain a NEMA motor starter for each fan. Each motor starter shall have an upstream circuit breaker that is lockable in the off position. Circuit breakers shall be 65 kA rated.

14. Type: Draw through.

15. Size and capacity as scheduled on Drawings.

16. Total height of cabinet and skid shall not exceed 5 feet - 3 inches. C. Packaged Roof-Top AC Units:

1. UL listed.

2. Designed for outdoor application.

3. Materials:

a. Frame and Base: Minimum 14 gauge galvanized steel. b. Exterior Panels: Minimum 17 gauge galvanized steel.

c. Door Liners for Downstream Access Doors: Minimum 20 gauge galvanized steel.

d. Gaskets: Dual durometer vinyl.

e. Insulation: 1 inch thick neoprene-coated glass fiber.

f. Fans: Painted rolled steel or galvanized steel.

g. Roof Curb: Minimum 12 gauge galvanized steel.

4. Cabinet, casing and frame:

a. Cross broken-top sections.

b. Designed to operate at total static pressure up to 5.5 inches WG. c. Hinged side panels with single lever latching.

d. Completely insulated.

e. Base equipped with lifting brackets with lifting holes. f. Hail screen for condenser coil.

5. Refrigerant condensing section:

a. Compressors:

1) Heavy duty, reciprocating, semi-hermetic type.

2) Positive displacement oil pump.

3) Suction and discharge service valves.

4) Crankcase heater.

5) Thermal overload protection. b. Refrigeration circuit:

e. Condenser fans:

1) Direct Drive: See Section 11005, Equipment: Basic Requirements.

2) Propeller-type.

f. Condenser fan motors:

1) Heavy duty, inherently protected, non-reversing.

2) Permanently lubricated bearings.

3) Integral rain shield.

6. Cooling coil section:

a. Evaporator Coils: See paragraph(s) in Article 2.3, Equipment Coils.

b. Evaporator coil circuiting:

1) Adjustable thermal expansion valve per circuit with external equalizer.

2) Combination row/split face circuiting. c. Drain pan:

1) Mastic-coated:

2) Threaded drain connections.

7. Supply fan section:

a. Supply fans:

	1)	Double-width, double-inlet centrifugal type.
	2)	Forward curved.
	3)	Solid steel shafts.
	4)	200,000-hour relubricative ball-bearings.
b.	Fan	motors:
	1)	See Section 16220, Electric Motors.
	2)	Relubricative ball-bearings.
	3)	Adjustable base.

c. Driver and driven sheaves:

1) Keyed hub type.

2) Drive Sheaves: Fixed pitch diameter.

3) Driver:

a) Shipped with variable pitch diameter sheave.

b) Fixed pitch diameter size based on approved test and balance reports.

4) V-belt drives sized for 150 percent motor horsepower. d. Isolated fan assembly.

8. Filter section:

a. Filters: See Section 15890, HVAC: Ductwork. b. Access doors for filter removal.

9. Return air section:

a. Return fans:

1) Double-width, double-inlet, centrifugal type.

2) Forward curve.

3) Solid steel shaft.

4) 200,000-hour relubricative ball-bearings. b. Fan motors:

1) See Section 16220, Electric Motors.

2) Relubricative ball-bearings.

3) Adjustable base.

c. Driver and driven sheaves:

1) Keyed hub type.

2) Drive Sheaves: Fixed pitch diameter.

3) Driver:

a) Shipped with variable pitch diameter sheave.

b) Fixed pitch diameter size based on approved test and balance reports.

4) V-belt drives sized for 150 percent motor horsepower. d. Isolated fan assembly.

e. Designed to form a plenum.

10. Outdoor air section:

a. Designed to form a plenum.

b. 0 to 100-percent outside air with economizer control. c. Horizontal louvers with rain lip and birdscreen.

d. Floor sloped for water drainage. e. Dampers:

1) Sized to handle 100 percent supply air volume.

2) Arranged vertically to encourage mixing of return and outside airstreams.

3) Airfoil type.

4) Fully gasketed and side sealed. f. Adjustable potentiometer.

g. Adjustable enthalpy control outside of airstream. h. Modulating spring return type damper motor.

11. Electrical:

a. Factory wired in accordance with NFPA 70 requirements. b. 115 V control circuit transformer.

c. 115 V receptacle. d. Supply air firestat. e. Control circuit fuse.

f. Individually fused supply and return fan motors, compressor and condenser fan motor branch circuits.

g. Disconnect switch, NEMA 4X 316 stainless steel.

12. Control panel to include:

a. Interface with controls to main HVAC control panel.

b. Factory wired in accordance with NFPA 70 requirements.

c. Provide minimum 3-inch space between each control component on face of panel.

d. NEMA 4X 316 stainless steel construction.

e. Panel shall conform to Section 16442, Control Panels.

13. Size and capacity as scheduled on Drawings.

D. Roof-Mounted Centrifugal Exhaust Fans:

1. AMCA certified.

2. Non-overloading horsepower capability.

3. Materials:

a. Top Cap: Spun aluminum.

b. Wheel and Inlet Shroud: Aluminum.

c. Baffle: Aluminum.

d. Base: One-piece aluminum.

e. Drive Assembly Supports: Steel.

f. Drive Shaft: Solid stainless steel.

4. Backward inclined blades.

5. Tapered inlet shroud.

6. Downblast.

7. Statically and dynamically balanced wheel.

8. Bearings:

a. Permanently sealed, flange type, ball-bearings. b. Five-to-one load capability to actual load ratio. c. 200,000 hours average life.

9. Weathertight compartment for motor and drives. a. Separated from airstream.

10. Motor:

a. See Section 16220, Electric Motors. b. Driver and driven sheaves:

1) Keyed hub type.

2) Drive Sheaves: Fixed pitch diameter.

3) Driver:

a) Shipped with variable pitch diameter sheave.

b) Fixed pitch diameter size based on approved test and balance reports.

4) V-belt drives sized for 150 percent motor horsepower.

11. Vibration isolated drive assembly.

12. Accessories:

a. Prefabricated insulated aluminum roof curb.

b. Backdraft Damper: See Section 15890, HVAC: Ductwork. c. Bird screen.

13. Size and capacity as scheduled on Drawings. E. Roof-Mounted Propeller-Type Supply Air Fans:

1. AMCA certified.

2. Belt-driven.

3. Materials:

a. Propeller: Cast aluminum or aluminum.

b. Hood and Fan Housing: Galvanized steel.

c. Curb Cap: Galvanized steel.

d. Orifice: Galvanized steel.

e. Drive Shaft: Solid steel.

f. Sheaves: Cast iron.

4. Propeller:

a. Statically and dynamically balanced. b. Airfoil design blades.

5. Continuously welded construction.

6. Hood:

a. Hinged access.

b. Channel type filter racks.

c. Equipped with internal birdscreen.

7. Filters: See Section 15890, HVAC: Ductwork.

8. Access doors on fan housing.

9. Bearings:

a. Grease lubricated pillow block-type. b. External grease fittings.

10. Motor: See Section 16220, Electric Motors.

11. Adjustable motor base.

a. Driver and driven sheaves:

1) Keyed hub type.

2) Drive Sheaves: Fixed pitch diameter.

3) Driver:

a) Shipped with variable pitch diameter sheave.

b) Fixed pitch diameter size based on approved test and balance reports.

4) V-belt drives sized for 150 percent motor horsepower.

12. Accessories:

a. Insulated roof curb.

b. Non-fused safety disconnect. c. Discharge diffusers.

d. Backdraft Damper: See Section 15890, HVAC: Ductwork.

13. Size and capacity as scheduled on Drawings. F. In-line Ceiling Exhaust Fans:

1. AMCA certified.

2. UL listed.

3. Materials: Galvanized steel.

4. Centrifugal wheels.

5. Permanently lubricated motor.

6. Acoustically insulated housing.

7. Resilient rubber-in-shear vibration isolation.

8. Fan, motor, and wheel assembly removable from housing.

9. Duct flanged outlet.

10. Integral backdraft damper.

11. Minimum 85-percent free open area face grill.

12. Size and capacity as scheduled on Drawings. G. Air Terminal Units (VAV):

1. Air terminal units, single duct, with coils: Variable volume, high velocity unit with heating coil, as indicated.

2. Configured for pressure independent control.

3. Capacity: As scheduled on Drawings.

4. Noise level: Based on ARI 885-98.

5. Operators: See Section 15970, Instrumentation and Control for HVAC Systems:

a. Factory or field installed on units.

6. Acoustical fiberglass liner:

a. Comply with NFPA-90a for fire resistivity and UL Standard 181 for erosion.

b. Insulation shall consist of 1 IN thick non-porous foil faced rigid fiberglass insulation secured by full length galvanized steel z-strips which enclose and seal all edges, eliminating tape and adhesives.

7. Provide multi-point velocity pressure sensors with external pressure taps.

8. Provide static pressure tube(s).

9. Valve adjustment: field adjustable.

10. Set air terminal units to air flow rates indicated.

11. Casing leakage: 5 percent, maximum, of nominal rated capacity at 3.0-inch WG

internal pressure.

12. 120 VAC power.

13. Heating coils for air terminal units: See paragraph 2.3 A.

14. Inlet air valves for air terminal units: Corrosion resistant, self-seating type:

a. Frame, links and levers may be of zinc coated steel or aluminum.

b. Vanes, pivots, hinged or knuckle joints: Aluminum or other non-ferrous metal.

c. Leakage: Not greater than 3 percent of maximum rated capacity when closed against inlet static pressure of 4.0-inch WG.

d. Equip with suitable linkage and motor mounting platform to accommodate control operators.

e. Use resilient sealing members to prevent leakage.

f. Provide direct reading air flow rate scale and external adjustment.

15. Construction: 22 gauge galvanized steel or 0.040 inch aluminum, minimum.

16. Size and capacity as scheduled on Drawings. H. Unitary Split System Air Conditioning:

1. Outdoor Unit (AC):

a. Casing and frame:

1) Material: Heavy gauge galvanized steel.

2) Insulation: 1 inch thick neoprene-coated glass fiber.

3) Installation: Base equipped with lifting brackets with lifting holes.

4) Removable end panel for access to components and connections. b. Compressors:

1) Heavy duty, reciprocating, semi-hermetic type.

2) Positive displacement oil pump.

3) Suction and discharge service valves.

4) Thermal overload protection. c. Refrigeration circuit:

1) Sight glass.

2) Filter dryer.

3) Manual shut-off valve.

4) High pressure relief valve. d. Compressor isolators.

e. Condenser coils:

1) Nominal 3/8 inch OD seamless copper mechanically bonded to corrugated aluminum fins.

2) Factory leak tested at 315 psig under water.

f. Condenser fans:

1) Direct Drive: See Section 11005, Equipment: Basic Requirements.

2) Propeller type.

g. Condenser fan motors:

1) Heavy duty, inherently protected, non-reversing.

2) Permanently lubricated bearings.

3) Integral rain shield.

2. Indoor unit (AHU):

a. Materials:

1) Casing: Heavy gauge steel.

2) Framework: Steel angle.

3) Pan Insulation: Foam-in-place insulation.

4) Casing Insulation: 1 inch, 3/4 pound fiberglass blanket.

b. Casing:

1) Removable access panels. c. Evaporated fans:

1) Centrifugal type.

2) Forward curved or airfoil.

3) Solid steel shafts.

4) 200,000-hour relubricative ball-bearings. d. Fan motors:

1) See Section 11005, Equipment: Basic Requirements.

2) Relubricative ball-bearings.

3) Variable pitch sheave.

4) Adjustable base.

e. V-belts and drives sized for 150 percent motor capacity. f. Isolated fan assembly.

g. Filter section:

1) Filters: See Section 15890, HVAC: Ductwork.

2) Access doors for filter removal.

h. Evaporator Coils: See paragraph(s) in Article 2.3, Equipment Coils.

i. Drain pan:

1) Mastic-coated.

2) Threaded drain connections.

j. Size and capacity as scheduled on Drawings.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install in accordance with Section 11005, Equipment: Basic Requirements.

B. Install fixed pitched drive sheave after sheave has been sized based on accepted test and balance report.

3.2 FIELD QUALITY CONTROL

A. Comply with Section 15954, HVAC Testing, Adjusting and Balancing.

3.3 ADJUSTING

A. Install new filters on units which have been running prior to acceptance of Project.