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	SECTION 15705
	SMALL DUCT HIGH VELOCITY HVAC SYSTEM
	** NOTE TO SPECIFIER ** Unico Inc., small duct high velocity heating and cooling system for new construction and retrofit. . This section is based on the products of Unico, Inc., which is located at: 7401 Alabama Ave. St. Louis, MO 63111-9906 Toll Free Tel: (800) 527-0896 Tel: (314) 481-9000 Fax: (314) 457-9000 Web: www.unicosystem.com Email: sales@unicosystem.com [ Click Here ] for additional information. The Unico System uses 2-inch inside diameter ducts to heat and cool historically significant buildings, new and custom homes, room additions, and many other applications where space is at a premium. Because the system has such low impact on the aesthetics of a structure, it has many possible applications. Regardless of your building's age, design or construction, the Unico System is designed to fit. It's ideal for heating or cooling buildings with: electric, steam or hot water heat, chilled water loops, radiant floor heat, inadequate or no ductwork, inadequate cooling on upper levels, limited space, baseboard and radiator heat. Unico provides design and sizing guidelines for HVAC contractors who might be providing full design and construction services to owners. These materials would also be of considerable use to A/E's. Contact the manufacturer for the following: Bulletin 40-01 - Unico System Applications: How You Can Use It. Bulletin 40-10 - Quik-Sizer Instructions (enough design detail to do basic pricing) Bulletin 40-30 - Component Layout (advice and examples of layouts) Bulletin 40-40 - System Sizing and Layout Procedure (detailed design) . In addition, there are a series of Tech Notes on specific special conditions and applications, such as high altitude applications, zoning, spot cooling, humidification, State of California requirements, outside air, condensation, return ducts, etc.
	PART 1	GENERAL
	1.1	SECTION INCLUDES
	** NOTE TO SPECIFIER ** Delete items below not required for project.
		A.	Indoor small duct high velocity HVAC system in the following configuration:
	** NOTE TO SPECIFIER ** The air handling unit is provided with a heating coil and a cooling coil, unless either heating or cooling is not required. Select one of the following three paragraphs and delete those not required.
			1.	Air handling unit with heat and cooling exchanger coils.
			2.	Air handling unit with heat exchanger coils.
			3.	Air handling unit with cooling exchanger coils.
	** NOTE TO SPECIFIER ** Edit the following paragraphs to define the input supply types for heating and/or cooling as required. Consult manufacturer for other alternatives not listed below. Note that Unico does not manufacture the outdoor units for split systems. Coordinate the selection of equipment with Design Requirements. Delete items not required.
			4.	Design System for the following input supply:
				a.	Cooling by DX split system refrigeration.
				b.	Cooling by DX split system heat pump.
				c.	Cooling by chilled water from existing chiller.
				d.	Heating by DX split system heat pump.
				e.	Heating by hot water from existing boiler or hot water heater.
				f.	Heating by electric heating.
				g.	Supplementary electric heating.
	** NOTE TO SPECIFIER ** The following paragraph is an example description of system zoning and control. Edit to suit project requirements. Note that Unico does not manufacture the control systems. Coordinate the selection of equipment with Design Requirements.
			5.	Control and Zoning: Provide system to divide the conditioned area into 2 zones, each controlled by a separate thermostat, as follows:
				a.	Lower floor.
				b.	Upper floor.
	** NOTE TO SPECIFIER ** The following are examples of provisions that might be added to clarify a retrofit installation. Edit to suit project. Delete if such provisions are indicated on Drawings.
		B.	Locate air handling unit in attic; provide 24 by 24 inch (610 by 610 mm) access panel in ceiling of hallway and plywood flooring under and around unit.
		C.	Locate electrical panel in utility room.
		D.	Locate thermostat in living room.
		E.	Conceal all ducts in existing construction; do not add chases, soffits, or bulkheads to conceal ducts.
	1.2	RELATED SECTIONS
	** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
		A.	Section 15180 - Heating and Cooling Piping: Condensate piping rough-in to drain pan locations.
		B.	Section 15500 - Heating Boilers and Accessories: including circulation pumps and hydronic piping to indoor coils.
		C.	Section 15730 - Air Conditioning Equipment: Outdoor unit of DX split system, including installation and refrigerant piping to indoor coils.
		D.	Section 15740 - Heat Pumps: Outdoor unit of DX split system, including installation and transfer piping to indoor coils.
		E.	Section 15900 - Controls: Requirements for connecting units to controls remote from units specified in this section.
		F.	Section 16100 - Electrical rough-in to air handling unit.
		G.	Section 16100 - Electrical rough-in to panel location.
	1.3	REFERENCES
	** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
		A.	ANSI/ASHRAE Standard 90.2-2004, Energy-Efficient Design of Low-Rise Residential Buildings
		B.	ASHRAE document 90.1, "Energy Standard for Buildings Except Low-rise Residential Buildings"
		C.	ARI 210/240 - Standard for Unitary Air-Conditioning and Air-Source Heat Pump Equipment; Air-Conditioning and Refrigeration Institute.
		D.	CSA 22.2 No. 236 - Heating and Cooling Equipment; CSA International. (same as UL 1995)
		E.	UL 94 - Tests for Flammability of Plastic Materials for Parts in Devices and Appliances; Underwriters Laboratories Inc.
		F.	UL 181 - Standard for Factory-Made Air Ducts and Air Connectors; Underwriters Laboratories Inc.
		G.	UL 1995 - Heating and Cooling Equipment; Underwriters Laboratories Inc. (same as CSA 22.2 No. 236)
	** NOTE TO SPECIFIER ** Design layout and size the equipment in accordance with the following requirements. This specification is prepared so that the design of the duct layout and details of installation are the responsibility of the Contractor, based on Unico's recommended design procedures. Contact the manufacturer for additional design information.
	1.4	DESIGN REQUIREMENTS
		A.	Provide a room-by-room load analysis based on Unico Bulletins 40-10, 40-30, and 40-40, using ASHRAE climate tables in accordance with the applicable building code.
			1.	Design to deliver at least the minimum airflow required to produce the required capacity for heating or cooling, whichever is greater.
			2.	Provide balanced airflow by matching the number of outlets in each room to the required load.
			3.	Provide further means of adjusting airflow by either changing fan speed, restricting flow using a restrictor plate or by using balancing orifices.
	** NOTE TO SPECIFIER ** Edit and complete the following design criteria paragraphs to suit design requirements for project. Contact manufacturer to obtain the manufacturer's design recommendations.
		B.	Total Cooling Capacity: ____ BTU/hr (____ kW), based on entering air temperature of 80 degrees F (26.7 degrees C) dry bulb and 67 degrees F (19.4 degrees C) wet bulb, based on rating tested as specified in ARI 210/240.
		C.	Total Heating Capacity: ____ BTU/hr (____ kW), based on entering air temperature of 70 degrees F (21.1 degrees C) dry bulb.
		D.	Refrigerant Systems: Comply with ARI 210/240.
			1.	Capable of delivering minimum of 250 cfm per nominal ton (120 cu m/hr per nominal kW) of capacity.
			2.	Seasonal Energy Efficiency Ratio (SEER): 10.0, minimum.
			3.	Heat Pump Heating Seasonal Performance Factor (HSPF): 6.8, minimum.
		E.	Hydronic Systems: Include temperature rise across fan and motor in calculation of capacity of coils; base capacity of coils on:
			1.	Chilled Water Coil: Entering water temperature of ____ degrees F (____ degrees C) at _____ gpm (_____ l/s).
			2.	Hot Water Coil: Entering water temperature of ____ degrees F (____ degrees C) at _____ gpm (_____ l/s).
		F.	Supply Duct System: Constructed of sealed components capable of maintaining 2 inches wg (500 Pa) static pressure.
		G.	Return Duct System: Designed for maximum 0.15 inches (37 Pa) static pressure at required air flow, with allowance for proper functioning of filters.
	1.5	SUBMITTALS
		A.	Submit under provisions of Section 01300.
		B.	Product Data: Manufacturer's data sheets on each product to be used, including:
			1.	Equipment Data:
				a.	Cooling and heating capacities.
				b.	Dimensions.
				c.	Rough-in connections and connection requirements.
				d.	Duct connections.
				e.	Electrical requirements with electrical characteristics and connection requirements.
				f.	Controls.
				g.	Accessories.
			2.	Design Data: Data to support compliance with Design Requirements.
			3.	Preparation instructions and recommendations.
			4.	Storage and handling requirements and recommendations.
			5.	Installation methods.
		C.	Shop Drawings: Show duct layouts and location of air outlets and return inlets, details of installation of air handling unit, locations of drain lines and electrical panels.
		D.	Certificates: Product certificates signed by the manufacturer certifying material compliance with specified performance characteristics and criteria, and physical requirements.
		E.	Manufacturer's Field Reports: Submit start-up report for each unit.
		F.	Closeout Submittals:
			1.	Submit manufacturer's descriptive literature, operating instructions, installation instructions, and maintenance and repair data.
			2.	Field Reports: Submit start-up report for each unit and balancing report for each room.
	1.6	QUALITY ASSURANCE
		A.	Manufacturer Qualifications: Company specializing in the manufacture of products similar in material and design to those specified with a minimum of 5 years documented experience.
		B.	Installer Qualifications: Company specializing in performing Work of this section with minimum three years documented experience.
		C.	Preinstallation Meetings: Conduct meeting to verify project requirements, installation conditions, manufacturer's installation instructions, and other requirements. Comply with Division 1 requirements.
	1.7	DELIVERY, STORAGE, AND HANDLING
		A.	Store products in manufacturer's unopened packaging until ready for installation.
		B.	Protect equipment from damage by providing temporary covers until construction is complete in each adjacent space.
	1.8	COORDINATION
		A.	Coordinate wall openings, piping rough-in locations, mounting locations and electrical rough-in locations to accommodate Work of this Section.
	PART 2	PRODUCTS
	2.1	MANUFACTURERS
		A.	Acceptable Manufacturer: Unico System, Inc. , which is located at: 7401 Alabama Ave. ; St. Louis, MO 63111-9906; Toll Free Tel: 800-527-0896; Tel: 314-481-9000; Fax: 314-457-9000; Email: request info; Web: www.unicosystem.com
	** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
		B.	Substitutions: Not permitted.
		C.	Requests for substitutions will be considered in accordance with provisions of Section 01600.
	2.2	EQUIPMENT COMPONENTS
		A.	Air Handling Unit: Fan, motor, heat exchangers and controls, mounted in 22 gage (0.75 mm) thick galvanized steel cabinet, designed for easy installation and maintenance.
			1.	Fan: Direct driven centrifugal type designed for high pressure applications, capable of delivering 1.2 inches of water (298 Pa) external static pressure at the minimum airflow required from section D.1..
			2.	Fan Motor: Permanent split capacitor type with Class B insulation, permanently lubricated ball bearings, direct mounted to blower with heavy gauge wire frame and rubber isolators, and automatic reset thermal overload protection; 208-230 V, 1 phase, 60 Hz. Motor, inlet ring, and wheel assembly designed for easy service using quick release twist-lock design.
			3.	Units Over 100 lb (45 kg) in Weight (Mass): Modular sections of less than 100 lb (45 kg) in weight (mass) that are easily joined without special tools.
			4.	Tested and listed for electrical safety by ITS/ETL (in accordance with UL 1995 and CSA 22.2 No. 236).
	** NOTE TO SPECIFIER ** Edit the following refrigerant coil paragraphs as required for both cooling only and heating/cooling in a split system DX cooling or heat pump system. Delete paragraph heating or cooling paragraph if not required Note that Unico does not make the outdoor unit for split systems.
		B.	Refrigerant Coils: R22 or R410A refrigerant; 3/8 inch (9.5 mm) minimum diameter copper tubes with mechanically bonded or soldered fins; dehydrated and sealed after testing and prior to evacuation and charging; charged with nitrogen holding charge of less than 10 psig (69 kPa).
			1.	Refrigerant Metering: By means of externally equalized TX valve; expansion valve either factory soldered or of flare connected type with factory-flared copper pipe fitting eliminating need to field flare tubing, or connected using chatleff connections.
			2.	Heat Pump Coils: Include internal or external bypass check valve.
			3.	Liquid Line Connection: 3/8 inch (9.5 mm) OD.
	** NOTE TO SPECIFIER ** Select paragraph for the system(s) selected and delete paragraph not required. If more than one system type is required indicate location of each on the Equipment Schedule at the end of this section or on the Drawings.
			4.	Suction Line Connection (2 to 5 Ton Systems): 7/8 inch (22.2 mm) OD.
			5.	Suction Line Connection (1 to 1.5 Ton Systems): 5/8 inch (15.9 mm) OD.
		C.	Hydronic Coils: 150 psig (1034 kPa) design pressure at 200 degrees F (93 degrees C); designed to slide in and out of cabinet for easy maintenance.
			1.	Vent plug at highest practical point of the coil.
			2.	Drain plug at the lowest practical point of the coil.
			3.	Water Connections: 7/8 inch (22.2 mm) OD.
			4.	M1218 Hot Water Coil Connections: 5/8 inch (15.9 mm) OD.
		D.	Drain Pans: Stainless steel; provide for each cooling coil.
	** NOTE TO SPECIFIER ** Select one of the following two paragraph required for the system selected and delete paragraph not required. If more than one system type is required indicate location of each on the Equipment Schedule at the end of this section or on the Drawings.
			1.	Connection to Drain (Less Than 2 ton Capacity): 1/2 inch (12.7 mm).
			2.	Connection to Drain (2 Ton Capacity and Larger): 3/4 inch (19.1 mm).
			3.	Primary drain pan to be trapped using a 2.5 inch (64 mm) deep clear trap with clean out access.
			4.	Provide secondary drain pan under entire unit wherever overflow of condensate could cause damage; provide separate connection to drain.
	** NOTE TO SPECIFIER ** Electric furnace modules are used to temper the air during the defrost cycle, preventing cold air from entering the room before the air stream warms up. They are also used for back-up heating for heat pump systems in very cold weather and for emergencies when the primary heating system fails. Edit as required for project.
		E.	Electric Furnace Module: Electric, UL-listed, ___-stage, with first stage greater or equal to all other stages.
			1.	Capacity: ______ KW, 230 volts, 1 phase, 60 Hz.
			2.	Protected by circuit breakers.
			3.	Include separate circuit for blower with separate breaker.
			4.	Locate directly mounted to blower discharge.
			5.	Controls: Safety limits and defrost circuit, where one or more stages will be energized during the defrost mode.
		F.	Equipment Controls: 24 volt.
			1.	Fan: Provide inherent time delay-on-break or 45 second delay-on-break relay.
			2.	Transformer: 48VA class 2 24V/208-230V transformer, inherently or internally fused.
	** NOTE TO SPECIFIER ** Edit the following control paragraphs to suit project requirements. Delete those that are not relevant to system design. If more than one system type is required indicate location of each on the Equipment Schedule at the end of this section or on the Drawings.
			3.	Refrigerant Indoor Coils: Protect from freeze up by providing temperature limit control.
			4.	Heat Pump Indoor Coils: Provide additional bypass relay to disable the anti-frost control during defrost mode.
			5.	Outdoor Unit Low Ambient Head Pressure Control: Provide control to maximize system capacity as outdoor temperature drops by maintaining head pressure by controlling the condenser fan; provide components compatible with condenser fan motor.
			6.	Heat Pump Outdoor Unit Mild Weather Control: Provide control to limit head pressure, preventing nuisance tripping of compressor high pressure switch when heating is required during warm ambient conditions.
			7.	Electric Heater Control: Provide an adjustable outdoor thermostat to limit the operation of the third stage electric heat to low outdoor temperature conditions or when condenser is not energized.
			8.	Soft-start, soft-stop motor controller.
			9.	Ventilation speed option at motor half speed with low speed power use less than 30 percent of the full speed power.
	2.3	DUCT COMPONENTS
		A.	Supply Plenum: Design system to provide pressurized manifold between air handling unit and supply tubing, with as few elbows and tees as possible.
	** NOTE TO SPECIFIER ** Select paragraph(s) for the supply plenum system required and delete paragraphs not required. If more than one system type is required indicate location of each on the Equipment Schedule at the end of this section or on the Drawings.
			1.	Construction:
				a.	Insulated and sealed metal duct, round or rectangular.
				b.	Glass fiber duct board, 1 inch (25.4 mm) thick, rectangular.
				c.	Glass fiber duct board, 1-1/2 inch (38.1 mm) thick, rectangular.
	** NOTE TO SPECIFIER ** Select paragraph(s) for the system selected and delete paragraph not required. If more than one system type is required indicate location of each on the Equipment Schedule at the end of this section or on the Drawings.
			2.	Size for Airflow Less Than 700 cfm (1175 cu m/hr): 7 inches (1780 mm) inside diameter, or equivalent, minimum.
			3.	Size for Airflow Less Than 1000 cfm (1695 cu m/hr): 9 inches (2290 mm) inside diameter, or equivalent, minimum.
			4.	Size for Airflow Less Than 1250 cfm (2120 cu m/hr): 10 inches (2540 mm) inside diameter, or equivalent, minimum.
		B.	Supply Tubing: Flexible, two-ply corrugated aluminum duct, 2 inches (50.8 mm) inside diameter, maximum; wrapped with glass fiber insulation with outer reinforced aluminized Mylar vapor retarder jacket; ETL listed as air duct in accordance with UL 181.
		C.	Sound Attenuator Duct: Helical wire and spun-bonded nylon or polyester, wrapped with glass fiber insulation with outer reinforced aluminized Mylar vapor retarder jacket; ETL listed as air duct in accordance with UL 181.
			1.	Provide minimum of 3 feet (900 mm) attenuator duct at outlet end of each supply run, connected to at least 3 feet (900 mm) of Supply Tubing, or use Sound Attenuator for entire branch duct length.
		D.	Duct Connectors: Metal, with tape ring or other means of sealing the outer jacket of duct without compressing the insulation.
			1.	Supply Tubing to Plenum Connectors: Sealed with gaskets; flanged stub with sheet metal screws for metal plenum; spin-in connection for glass fiber plenum.
			2.	Tubing-to-Tubing Couplings: Secure inner core to connector by means of hose clamp or sheet metal screw; secure and seal outer jacket to coupling tape ring with UL-listed aluminum tape or UL-listed duct tape.
	** NOTE TO SPECIFIER ** Select paragraph(s) for the air outlets required and delete paragraphs not required. If more than one type is required indicate location of each on the Equipment Schedule at the end of this section or on the Drawings.
		E.	Air Outlets (Supply Tubing Terminators):
			1.	Plastic: UL 94HB fire-rated plastic.
			2.	Ceiling Outlets: 2 inches (50 mm) diameter, with 5 inches (125 mm) diameter flange; one piece plastic, no grille.
			3.	Wall Outlets: 1/2 inch by 8 inches (12 by 200 mm) rectangular metal slots with flanged trim.
			4.	Floor Outlets: 2 inches (50 mm) diameter, with 5 inches (125 mm) diameter flange; plastic with hardwood flange and screen, no grille.
			5.	Provide caps for round outlets to prevent moisture migration during extended period of non-use in cold weather.
		F.	Return Air Duct: One or more return ducts with filter and intake grille, including at least one 90 degree bend; constructed of the following:
	** NOTE TO SPECIFIER ** Select paragraph(s) for the return air duct required and delete paragraphs not required. If more than one system type is required indicate location of each on the Equipment Schedule at the end of this section or on the Drawings.
			1.	Acoustical dampening flexible duct.
			2.	Glass fiber duct board.
			3.	Metal duct lined with acoustical insulation or duct liner.
	2.4	FABRICATION
		A.	Fabricate and support ducts in accordance with SMACNA HVAC Duct Construction Standards, and Unico Bulletins. Provide duct material, gages, reinforcing, and sealing for operating pressures indicated.
	PART 3	EXECUTION
	3.1	EXAMINATION
		A.	Verify that openings and rough-in have been properly prepared.
			1.	Verify wall opening is ready for wall sleeve installation.
			2.	Verify wall construction is ready for unit installation.
			3.	Verify piping rough-in is at correct location.
			4.	Verify electrical rough-in is at correct location.
		B.	If preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.
	3.2	PREPARATION
		A.	Clean surfaces thoroughly prior to installation.
		B.	Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.
		C.	Furnish sleeves for supply and return outlets to installer at appropriate time in construction sequence.
	3.3	INSTALLATION
		A.	Install system in accordance with manufacturer's instructions.
		B.	Install air handling units level.
		C.	Connect controls to remote locations.
		D.	Install condensate drain piping to condensate drainage system.
	** NOTE TO SPECIFIER ** Edit the following paragraphs as required for the system(s) required for the project. Delete the paragraphs not required...
		E.	Install the following piping accessories on piping connections. Refer to Section 15180.
			1.	On supply:
				a.	Shutoff valve.
				b.	Strainer.
			2.	Control valve.
				a.	On return.
				b.	Shutoff valve.
			3.	Balancing valve.
			4.	Flow control valve.
			5.	Water coils:
				a.	Install manual air vents at high points complete with shutoff valve.
				b.	Install automatic air vents at high points complete with shutoff valve.
		F.	Install ductwork as indicated. Provide supply and return out lets where indicated.
		G.	Balance air supply to each room as required.
	3.4	CLEANING
		A.	After construction is completed, including painting, clean exposed surfaces of units and vacuum clean coils and inside of cabinets.
		B.	Touch up marred or scratched surfaces of factory finished cabinets, using finish materials furnished by manufacturer.
		C.	Install new throwaway filters in units after Substantial Completion.
	** NOTE TO SPECIFIER ** Use the following article if a schedule is required to clarify system requirements and locations. The following is an example of a typical Schedule, modify to suit project requirements. Delete if not required.
	3.5	SCHEDULES
AIR HANDLING UNITS Drawing Code AHU-1 AHU-2 AHU-3 Location Model Number Supply Air Air flow Outside air flow Cooling Rated cooling output Entering air temperature (dry bulb) Entering air temperature (wet bulb) Condenser ambient air temperature Energy efficiency ratio Hot Water Heating Heating capacity Water flow Entering water temperature Coil pressure drop Steam Heating Heating capacity Steam flow Steam pressure Electric Heating Electric resistance heating capacity Gas Heating Input Output Heat Pump Heating Rated heating output Rated outdoor air temperature Rated air temperature entering indoor coil Reverse Cycle COP DUCTWORK MATERIAL SCHEDULE AIR SYSTEM MATERIAL Supply Glass fiber duct board rectangular (Heating Systems) Supply Insulated sealed metal duct round (System with Cooling Coils) Glass Return and Relief Flexible Acoustical Duct, round DUCTWORK PRESSURE CLASS SCHEDULE AIR SYSTEM PRESSURE CLASS Constant Volume Supply 2 inches wg (500 Pa) static pressure. Supply (Heating Systems) 2 inches wg (500 Pa) static pressure. Supply (System with Cooling Coils) 2 inches wg (500 Pa) static pressure.
	END OF SECTION