GUIDE SPECIFICATIONS – 582J*04-06
Gas Heat/Electric Cooling Packaged Rooftop

HVAC Guide Specifications
Size Range:		3 to 5 Nominal Tons	

Section	Description
23 06 80	Schedules for Decentralized HVAC Equipment
		23 06 80.13	Decentralized Unitary HVAC Equipment Schedule
		23 06 80.13.A.	Rooftop unit schedule
	1.	Schedule is per the project specification requirements.
23 07 16	HVAC Equipment Insulation
		23 07 16.13	Decentralized, Rooftop Units:
		23 07 16.13.A.	Evaporator fan compartment:
	1.	Interior cabinet surfaces shall be insulated with a minimum 1/2-in. thick, minimum 1 1/2 lb density, flexible fiberglass insulation bonded with a phenolic binder, neoprene coated on the air side.
	2.	Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation.
		23 07 16.13.B.	Gas heat compartment:
	1.	Aluminum foil-faced fiberglass insulation shall be used.
	2.	Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation.
23 09 13	Instrumentation and Control Devices for HVAC
		23 09 13.23	Sensors and Transmitters
		23 09 13.23.A.	Thermostats
	1.	Thermostat must
	a.	energize both “W” and “G” when calling for heat.
	b.	have capability to energize 1 stage of cooling, and 2 different stages of heating.
	c.	include capability for occupancy scheduling.
23 09 23	Direct-digital Control system for HVAC
		23 09 23.13	Decentralized, Rooftop Units:
		23 09 23.13.A.	RTU Open multi-protocol, direct digital controller:
	1.	Shall be ASHRAE 62 compliant.
	2.	Shall accept 18-30VAC, 50-60Hz, and consumer 15VA or less power.
	3.	Shall have an operating temperature range from -40°F (-40°C) to 130°F (54°C), 10% - 90% RH (non-condensing).
	4.	Shall include built-in protocol for BACNET (MS/TP and PTP modes), Modbus (RTU and ASCII), Johnson N2 and LonWorks. LonWorks Echelon processor required for all Lon applications shall be contained in separate communication board.
	5.	Shall allow access of up to 62 network variables (SNVT). Shall be compatible with all open controllers.
	6.	Baud rate Controller shall be selectable using a dipswitch.
	7.	Shall have an LED display independently showing the status of serial communication, running, errors, power, all digital outputs, and all analog inputs.
	8.	Shall accept the following inputs: space temperature, setpoint adjustment, outdoor air temperature, indoor air quality, outdoor air quality, compressor lock-out, fire shutdown, enthalpy switch, and fan status/filter status/ humidity/ remote occupancy.
	9.	Shall provide the following outputs: economizer, variable frequency drive, fan, cooling stage 1, cooling stage 2, heat stage 1, heat stage 2, exhaust reversing valve/high fan speed.
	10.	Shall have built-in surge protection circuitry through solid state polyswitches. Polyswitches shall be used on incoming power and network connections. Polyswitches will return to normal when the “trip” condition clears.
	11.	Shall have a battery back-up capable of a minimum of 10,000 hours of data and time clock retention during power outages.
	12.	Shall have built-in support for Bryant technician tool.
	13.	Shall include an EIA-485 protocol communication port, an access port for connection of either a computer or a Bryant technician tool, an EIA-485 port for network communication to intelligent space sensors and displays, and a port to connect an optional LonWorks communications card.
	14.	Software upgrades will be accomplished by either local or remote download. No software upgrades through chip replacements are allowed.
23 09 33	Electric and Electronic Control System for HVAC
		23 09 33.13	Decentralized, Rooftop Units:
		23 09 33.13.A.	General:
	1.	Shall be complete with self-contained low-voltage control circuit protected by a resettable circuit breaker on the 24-v transformer side. Transformer shall have 75VA capability.
	2.	Shall utilize color-coded wiring.
	3.	Shall include a central control terminal board to conveniently and safely provide connection points for vital control functions such as: smoke detectors, phase monitor, gas controller, economizer, thermostat, DDC control options, and low and high pressure switches.
	4.	The heat exchanger shall be controlled by an integrated gas controller (IGC) microprocessor. See heat exchanger section of this specification.
	5.	Unit shall include a minimum of one 8-pin screw terminal connection board for connection of control wiring.
		23 09 33.23.B.	Safeties:
	1.	Compressor over-temperature, over-current. High internal pressure differential.
	2.	Low pressure switch. 
	a.	Low pressure switch shall use different color wire than the high pressure switch. The purpose is to assist the installer and service technician to correctly wire and or troubleshoot the rooftop unit.
	3.	High pressure switch.
	a.	High pressure switch shall use different color wire than the low pressure switch. The purpose is to assist the installer and service technician to correctly wire and or troubleshoot the rooftop unit.
	4.	Automatic reset, motor thermal overload protector.
	5.	Heating section shall be provided with the following minimum protections:
	a.	High temperature limit switches.
	b.	Induced draft motor speed sensor.
	c.	Flame rollout switch.
	d.	Flame proving controls.
23 09 93	Sequence of Operations for HVAC Controls
		23 09 93.13	Decentralized, Rooftop Units:
		23 09 93.13	INSERT SEQUENCE OF OPERATION
23 40 13	Panel Air Filters
		23 40 13.13	Decentralized, Rooftop Units:
		23 40 13.13.A.	Standard filter section
	1.	Shall consist of factory installed, low velocity, disposable 2-in. thick fiberglass filters of commercially available sizes.
	2.	Unit shall use only one filter size. Multiple sizes are not acceptable. 
	3.	Filters shall be accessible through an access panel with “no-tool” removal as described in the unit cabinet section of this specification (23 81 19.13.G).
23 81 19	Self-Contained Air Conditioners
		23 81 19.13	Small-Capacity Self-Contained Air Conditioners (582J*04-06)
		23 81 19.13.A.	General
	1.	Outdoor, rooftop mounted, electrically controlled, heating and cooling unit utilizing a fully hermetic scroll compressor(s) for cooling duty and gas combustion for heating duty.
	2.	Factory assembled, single-piece heating and cooling rooftop unit. Contained within the unit enclosure shall be all factory wiring, piping, controls, and special features required prior to field start-up.
	3.	Unit shall use Puron refrigerant.
	4.	Unit shall be installed in accordance with the manufacturer’s instructions.
	5.	Unit must be selected and installed in compliance with local, state, and federal codes.
		23 81 19.13.B.	Quality Assurance
	1.	Unit meets ASHRAE 90.1 minimum efficiency requirements.
	2.	Unit shall be rated in accordance with AHRI Standards 210/240.
	3.	Unit shall be designed to conform to ASHRAE 15.
	4.	Unit shall be UL-tested and certified in accordance with ANSI Z21.47 Standards and UL-listed and certified under Canadian standards as a total package for safety requirements.
	5.	Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation.
	6.	Unit casing shall be capable of withstanding 500-hour salt spray exposure per ASTM B117 (scribed specimen).
	7.	Unit shall be designed in accordance with ISO 9001, and shall be manufactured in a facility registered by ISO 9001.
	8.	Roof curb shall be designed to conform to NRCA Standards.
	9.	Unit shall be subjected to a completely automated run test on the assembly line. The data for each unit will be stored at the factory, and must be available upon request.
	10.	Unit shall be designed in accordance with UL Standard 1995, including tested to withstand rain.
	11.	Unit shall be constructed to prevent intrusion of snow and tested to prevent snow intrusion into the control box up to 40 mph.
	12.	Unit shake tested to assurance level 1, ASTM D4169 to ensure shipping reliability.
		23 81 19.13.C.	Delivery, Storage, and Handling
	1.	Unit shall be stored and handled per manufacturer’s recommendations.
	2.	Lifted by crane requires either shipping top panel or spreader bars.
	3.	Unit shall only be stored or positioned in the upright position.
		23 81 19.13.D.	Project Conditions
	1.	As specified in the contract.
		23 81 19.13.E.	Operating Characteristics
	1.	Unit shall be capable of starting and running at 115°F (46°C) ambient outdoor temperature, meeting maximum load criteria of AHRI Standard 210/240 at ± 10% voltage.
	2.	Compressor with standard controls shall be capable of operation down to 40°F (4°C), ambient outdoor temperatures. Accessory winter start kit is necessary if mechanically cooling at ambient temperatures down to 25°F (-4°C).
	3.	Unit shall discharge supply air vertically or horizontally as shown on contract drawings.
	4.	Unit shall be factory configured for vertical supply & return configurations.
	5.	Unit shall be field convertible from vertical to horizontal airflow on all models. No special kit required.
	6.	Unit shall be capable of mixed operation: vertical supply with horizontal return or horizontal supply with vertical return.
		23 81 19.13.F.	Electrical Requirements
	1.	Main power supply voltage, phase, and frequency must match those required by the manufacturer. 
		23 81 19.13.G.	Unit Cabinet
	1.	Unit cabinet shall be constructed of galvanized steel, and shall be bonderized and coated with a prepainted baked enamel finish on all externally exposed surfaces.
	2.	Unit cabinet exterior paint shall be: film thickness, (dry) 0.003 inches minimum, gloss (per ASTM D523, 60°F / 16°C): 60, Hardness: H-2H Pencil hardness.
	3.	Evaporator fan compartment interior cabinet insulation shall conform to AHRI Standards 210/240 minimum exterior sweat criteria. Interior surfaces shall be insulated with a minimum 1/2-in. thick, 1 lb density, flexible fiberglass insulation, neoprene coated on the air side. Aluminum foil-faced fiberglass insulation shall be used in the gas heat compartment.
	4.	Base of unit shall have a minimum of four locations for thru-the-base gas and electrical connections (factory installed or field installed), standard.
	5.	Base Rail
	a.	Unit shall have base rails on a minimum of 2 sides.
	b.	Holes shall be provided in the base rails for rigging shackles to facilitate maneuvering and overhead rigging.
	c.	Holes shall be provided in the base rail for moving the rooftop by fork truck.
	d.	Base rail shall be a minimum of 16 gauge thickness.
	6.	Condensate pan and connections:
	a.	Shall be a sloped condensate drain pan made of a non-corrosive material.
	b.	Shall comply with ASHRAE Standard 62. 
	c.	Shall use a 3/4” -14 NPT drain connection, possible either through the bottom or side of the drain pan. Connection shall be made per manufacturer’s recommendations.
	7.	Top panel:
	a.	Shall be a single piece top panel on all sizes.
	8.	Gas Connections:
	a.	All gas piping connecting to unit gas valve shall enter the unit cabinet at a single location on side of unit (horizontal plane).
	b.	Thru-the-base capability
	(1.)	Standard unit shall have a thru-the-base gas-line location using a raised, embossed portion of the unit basepan.
	(2.)	Optional, factory approved, water-tight connection method must be used for thru-the-base gas connections.
	(3.)	No basepan penetration, other than those authorized by the manufacturer, is permitted.
	9.	Electrical Connections
	a.	All unit power wiring shall enter unit cabinet at a single, factory prepared, knockout location.
	b.	Thru-the-base capability.
	(1.)	Standard unit shall have a thru-the-base electrical location(s) using a raised, embossed portion of the unit basepan.
	(2.)	Optional, factory approved, water-tight connection method must be used for thru-the-base electrical connections.
	(3.)	No basepan penetration, other than those authorized by the manufacturer, is permitted.
	10.	Component access panels (standard)
	a.	Cabinet panels shall be easily removable for servicing.
	b.	Unit shall have one factory installed, tool-less, removable, filter access panel.
	c.	Panels covering control box, indoor fan, indoor fan motor, gas components (where applicable), and compressors shall have molded composite handles.
	d.	Handles shall be UV modified, composite. They shall be permanently attached, and recessed into the panel.
	e.	Screws on the vertical portion of all removable access panel shall engage into heat resistant, molded composite collars.
	f.	Collars shall be removable and easily replaceable using manufacturer recommended parts.
		23 81 19.13.H.	Gas Heat
	1.	General
	a.	Heat exchanger shall be an induced draft design. Positive pressure heat exchanger designs shall not be allowed.
	b.	Shall incorporate a direct-spark ignition system and redundant main gas valve.
	c.	Gas supply pressure at the inlet to the rooftop unit gas valve must match that required by the manufacturer.
	2.	The heat exchanger shall be controlled by an integrated gas controller (IGC) microprocessor.
	a.	IGC board shall notify users of fault using an LED (light-emitting diode).
	b.	The LED shall be visible without removing the control box access panel.
	c.	IGC board shall contain algorithms that modify evaporator fan operation to prevent future cycling on high temperature limit switch.
	d.	Unit shall be equipped with anti-cycle protection with one short cycle on unit flame rollout switch or 4 continuous short cycles on the high temperature limit switch. Fault indication shall be made using an LED.
	3.	Standard Heat Exchanger construction
	a.	Heat exchanger shall be of the tubular-section type constructed of a minimum of 20-gauge steel coated with a nominal 1.2 mil aluminum-silicone alloy for corrosion resistance.
	b.	Burners shall be of the in-shot type constructed of aluminum-coated steel.
	c.	Burners shall incorporate orifices for rated heat output up to 2000 ft (610m) elevation. Additional accessory kits may be required for applications above 2000 ft (610m) elevation, depending on local gas supply conditions.
	d.	Each heat exchanger tube shall contain multiple dimples for increased heating effectiveness.
	4.	Optional Stainless Steel Heat Exchanger construction
	a.	Use energy saving, direct-spark ignition system.
	b.	Use a redundant main gas valve.
	c.	Burners shall be of the in-shot type constructed of aluminum-coated steel.
	d.	All gas piping shall enter the unit cabinet at a single location on side of unit (horizontal plane).
	e.	The optional stainless steel heat exchanger shall be of the tubular-section type, constructed of a minimum of 20-gauge type 409 stainless steel.
	f.	Type 409 stainless steel shall be used in heat exchanger tubes and vestibule plate.
	g.	Complete stainless steel heat exchanger allows for greater application flexibility.
	5.	Optional Low NOx Heat Exchanger construction
	a.	Low NOx reduction shall be provided to reduce nitrous oxide emissions to meet California’s Air Quality Management District (SCAQMD) low-NOx emissions requirement of 40 nanograms per joule or less.
	b.	Primary tubes and vestibule plates on low NOx units shall be 409 stainless steel. Other components shall be aluminized steel.
	6.	Induced draft combustion motor and blower
	a.	Shall be a direct-drive, single inlet, forward-curved centrifugal type.
	b.	Shall be made from steel with a corrosion-resistant finish.
	c.	Shall have permanently lubricated sealed bearings.
	d.	Shall have inherent thermal overload protection.
	e.	Shall have an automatic reset feature.
		23 81 19.13.I.	Coils
	1.	Standard Aluminum Fin - Copper Tube Coils:
	a.	Standard evaporator and condenser coils shall have aluminum lanced plate fins mechanically bonded to seamless internally grooved copper tubes with all joints brazed.
	b.	Evaporator coils shall be leak tested to 150 psig, pressure tested to 450 psig, and qualified to UL 1995 burst test at 1775 psig.
	c.	Condenser coils shall be leak tested to 150 psig, pressure tested to 650 psig, and qualified to UL 1995 burst test at 1980 psig.
	2.	Optional Pre-coated aluminum-fin condenser coils (3 Phase Models Only):
	a.	Shall have a durable epoxy-phenolic coating to provide protection in mildly corrosive coastal environments.
	b.	Coating shall be applied to the aluminum fin stock prior to the fin stamping process to create an inert barrier between the aluminum fin and copper tube. 
	c.	Epoxy-phenolic barrier shall minimize galvanic action between dissimilar metals.
	3.	Optional Copper-fin evaporator and condenser coils (3 Phase Models Only):
	a.	Shall be constructed of copper fins mechanically bonded to copper tubes and copper tube sheets.
	b.	Galvanized steel tube sheets shall not be acceptable.
	c.	A polymer strip shall prevent coil assembly from contacting the sheet metal coil pan to minimize potential for galvanic corrosion between coil and pan. 
	4.	Optional E-coated aluminum-fin evaporator and condenser coils (3 Phase Models Only):
	a.	Shall have a flexible epoxy polymer coating uniformly applied to all coil surface areas without material bridging between fins. 
	b.	Coating process shall ensure complete coil encapsulation of tubes, fins and headers.
	c.	Color shall be high gloss black with gloss per ASTM D523-89.
	d.	Uniform dry film thickness from 0.8 to 1.2 mil on all surface areas including fin edges.
	e.	Superior hardness characteristics of 2H per ASTM D3363-92A and cross-hatch adhesion of 4B-5B per ASTM D3359-93.
	f.	Impact resistance shall be up to 160 in.-lb (ASTM D2794-93).
	g.	Humidity and water immersion resistance shall be up to minimum 1000 and 250 hours respectively (ASTM D2247-92 and ASTM D870-92).
	h.	Corrosion durability shall be confirmed through testing to be no less than 1000 hours salt spray per ASTM B117-90.
		23 81 19.13.J.	Refrigerant Components
	1.	Refrigerant circuit shall include the following control, safety, and maintenance features:
	a.	Fixed orifice metering system shall prevent mal-distribution of two-phase refrigerant by including multiple fixed orifice devices in each refrigeration circuit. Each orifice is to be optimized to the coil circuit it serves.
	b.	Refrigerant filter drier - Solid core design.
	c.	Service gauge connections on suction and discharge lines.
	d.	Pressure gauge access through a specially designed access port in the top panel of the unit.
	2.	There shall be gauge line access port in the skin of the rooftop, covered by a black, removable plug.
	a.	The plug shall be easy to remove and replace.
	b.	When the plug is removed, the gauge access port shall enable maintenance personnel to route their pressure gauge lines.
	c.	This gauge access port shall facilitate correct and accurate condenser pressure readings by enabling the reading with the compressor access panel on.
	d.	The plug shall be made of a leak proof, UV-resistant, composite material.
	3.	Compressors
	a.	Unit shall use fully hermetic, scroll compressor for each independent refrigeration circuit.
	b.	Compressor motors shall be cooled by refrigerant gas passing through motor windings.
	c.	Compressors shall be internally protected from high discharge temperature conditions.
	d.	Compressors shall be protected from an over-temperature and over-amperage conditions by an internal, motor overload device.
	e.	Compressor shall be factory mounted on rubber grommets.
	f.	Compressor motors shall have internal line break thermal, current overload and high pressure differential protection.
	g.	Crankcase heaters shall not be required for normal operating range, unless required by compressor manufacturer due to refrigerant charge limits.
		23 81 19.13.K.	Filter Section
	1.	Filters access is specified in the unit cabinet section of this specification.
	2.	Filters shall be held in place by a pivoting filter tray, facilitating easy removal and installation.
	3.	Shall consist of factory installed, low velocity, throw-away 2-in. thick fiberglass filters.
	4.	Filters shall be standard, commercially available sizes.
	5.	Only one size filter per unit is allowed.
		23 81 19.13.L.	Evaporator Fan and Motor
	1.	Evaporator fan motor:
	a.	Shall have permanently lubricated bearings.
	b.	Shall have inherent automatic-reset thermal overload protection or circuit breaker.
	c.	Shall have a maximum continuous bhp rating for continuous duty operation; no safety factors above that rating shall be required.
	2.	Direct Drive ECM X13 - Evaporator Fan Standard:
	a.	Multi-speed motor with easy quick adjustment settings.
	b.	Blower fan shall be double-inlet type with forward-curved blades.
	c.	Shall be constructed from steel with a corrosion resistant finish and dynamically ballanced.
	3.	Belt-driven Evaporator Fan Factory Optional:
	a.	Belt drive shall include an adjustable pitch motor pulley.
	b.	Shall use sealed, permanently lubricated ball-bearing type.
	c.	Blower fan shall be double-inlet type with forward-curved blades.
	d.	Shall be constructed from steel with a corrosion resistant finish and dynamically balanced.
		23 81 19.13.M.	Condenser Fans and Motors
	1.	Condenser fan motors:
	a.	Shall be a totally enclosed motor.
	b.	Shall use permanently lubricated bearings.
	c.	Shall have inherent thermal overload protection with an automatic reset feature.
	d.	Shall use a shaft-down design on all sizes. 
	2.	Condenser Fans:
	a.	Shall be a direct-driven propeller type fan.
	b.	Shall have galvalum blades riveted to corrosion-resistant steel spiders and shall be dynamically balanced.
		23 81 19.13.N.	Special Features Options and Accessories
	1.	Integrated EconoMi$er IV, EconoMi$er2, and EconoMi$er X standard leak rate models. (Factory installed on 3 phase models only. Field installed on all 3 and 1 phase models)
	a.	Integrated, gear driven opposing modulating blade design type capable of simultaneous economizer and compressor operation.
	b.	Independent modules for vertical or horizontal return configuration shall be available. Vertical return modules shall be available as a factory installed option.
	c.	Damper blades shall be galvanized steel with composite gears. Plastic or composite blades on intake or return shall not be acceptable.
	d.	Shall include all hardware and controls to provide free cooling with outdoor air when temperature and/or humidity are below setpoints.
	e.	Shall be equipped with gear driven dampers for both the outdoor ventilation air and the return air for positive air stream control.
	f.	Standard leak rate shall be equipped with dampers not to exceed 2% leakage at 1 in. wg pressure differential.
	g.	Economizer controller on EconoMi$er IV models shall be Honeywell W7212 that provides:
	(1.)	Combined minimum and DCV maximum damper position potentiometers with compressor staging relay.
	(2.)	Functions with solid state analog enthalpy or dry bulb changeover control sensing.
	(3.)	Contain LED indicates for:
when free cooling is available, when module is in DCV mode, when exhaust fan contact is closed.
	h.	Economizer controller on EconoMi$er X models shall be the Honeywell W7220 that provides:
	(1.)	2-line LCD interface screen for setup, configuration and troubleshooting.
	(2.)	On-board Fault Detection and Diagnostics (FDD) that senses and alerts when the economizer is not operating properly, per California Title 24.
	(3.)	Sensor failure loss of communication identification
	(4.)	Automatic sensor detection
	(5.)	Capabilities for use with multiple-speed indoor fan systems
	(6.)	Utilize digital sensors: Dry bulb and Enthalpy
	i.	Economizer controller on EconoMi$er 2  models with RTU Open models shall be a 4-20mA design controlled directly by the RTU Open controller. RTU Open meets California Title 24 Fault Detection & Diagnostic (FDD) requirements.
	j.	Shall be capable of introducing up to 100% outdoor air.
	k.	Shall be equipped with a barometric relief damper capable of relieving up to 100% return air and contain seals that meet ASHRAE 90.1 requirements.
	l.	Shall be designed to close damper(s) during loss-of-power situations with spring return built into motor.
	m.	Dry bulb outdoor air temperature sensor shall be provided as standard. Enthalpy sensor is also available on factory installed only. Outdoor air sensor setpoint shall be adjustable and shall range from 40 to 100°F /4 to 38°C. Additional sensor options shall be available as accessories.
	n.	The economizer controller shall also provide control of an accessory power exhaust unit function. Factory set at 100%, with a range of 0% to 100%.
	o.	The economizer shall maintain minimum airflow into the building during occupied period and provide design ventilation rate for full occupancy.
	p.	Dampers shall be completely closed when the unit is in the unoccupied mode.
	q.	Economizer controller shall accept a 2-10 Vdc CO2 sensor input for IAQ/DCV control. In this mode, dampers shall modulate the outdoor air damper to provide ventilation based on the sensor input.
	r.	Compressor lockout temperature on W7220 is adjustable from -45°F to 80°F, set at a factory default of 32°F. Others shall open at 35°F (2°C) and closes at 50°F (10°C).
	s.	Actuator shall be direct coupled to economizer gear. No linkage arms or control rods shall be acceptable.
	t.	Economizer controller shall provide indications when in free cooling mode, in the DCV mode, or the exhaust fan contact is closed.
	2.	Integrated EconoMi$er2, and EconoMi$er X Ultra Low Leak rate models. (Factory installed on 3 phase models only. Field installed on all 3 and 1 phase models)
	a.	Integrated, gear driven opposing modulating blade design type capable of simultaneous economizer and compressor operation.
	b.	Independent modules for vertical or horizontal return configuration shall be available. Vertical return modules shall be available as a factory installed option. 
	c.	Damper blades shall be galvanized steel with composite gears. Plastic or composite blades on intake or return shall not be acceptable.
	d.	Shall include all hardware and controls to provide free cooling with outdoor air when temperature and/or humidity are below setpoints.
	e.	Shall be equipped with gear driven dampers for both the outdoor ventilation air and the return air for positive air stream control
	f.	Ultra Low Leak design meets California Title 24 section 140.4 and ASHRAE 90.1 requirements for 4 cfm per sq.ft. on the outside air dampers and 10 cfm per sq. ft. on the return dampers.
	g.	Economizer controller on EconoMi$er X models shall be the Honeywell W7220 that provides:
	(1.)	2-line LCD interface screen for setup, configuration and troubleshooting
	(2.)	On-board Fault Detection and Diagnostics (FDD) that senses and alerts when the economizer is not operating properly, per California Title 24. 
	(3.)	Sensor failure loss of communication identification
	(4.)	Automatic sensor detection
	(5.)	Capabilities for use with multiple-speed indoor fan systems
	(6.)	Utilize digital sensors: Dry bulb and Enthalpy
	h.	Economizer controller on EconoMi$er 2 models with RTU Open models shall be a 4-20mA design controlled directly by the RTU Open controller. RTU Open meets California Title 24 Fault Detection & Diagnostic (FDD) requirements.
	i.	Shall be capable of introducing up to 100% outdoor air.
	j.	Shall be equipped with a barometric relief damper capable of relieving up to 100% return air and contain seals that meet ASHRAE 90.1 requirements.
	k.	Shall be designed to close damper(s) during loss-of-power situations with spring return built into motor.
	l.	Dry bulb outdoor air temperature sensor shall be provided as standard. Enthalpy sensor is also available on factory installed only. Outdoor air sensor setpoint shall be adjustable and shall range from 40 to 100° F / 4 to 38° C. Additional sensor options shall be available as accessories.
	m.	The economizer controller shall also provide control of an accessory power exhaust unit function. Factory set at 100%, with a range of 0% to 100%.
	n.	The economizer shall maintain minimum airflow into the building during occupied period and provide design ventilation rate for full occupancy. 
	o.	Dampers shall be completely closed when the unit is in the unoccupied mode.
	p.	Economizer controller shall accept a 2-10 Vdc CO2 sensor input for IAQ/DCV control. In this mode, dampers shall modulate the outdoor air damper to provide ventilation based on the sensor input.
	q.	Compressor lockout temperature on W7220 is adjustable from -45° F to 80° F, set at a factory default of 32° F. Others shall open at 35°F (2°C) and closes at 50°F (10°C).
	r.	Actuator shall be direct coupled to economizer gear. No linkage arms or control rods shall be acceptable.
	s.	Economizer controller shall provide indications when in free cooling mode, in the DCV mode, or the exhaust fan contact is closed.
	3.	Two-Position Damper (Factory installed on 3 Phase Models Only. Field installed on all 3 and 1 Phase Models)
	a.	Damper shall be a Two-Position Damper. Damper travel shall be from the full closed position to the field adjustable %-open setpoint.
	b.	Damper shall include adjustable damper travel from 25% to 100% (full open).
	c.	Damper shall include single or dual blade, gear driven dampers and actuator motor.
	d.	Actuator shall be direct coupled to damper gear. No linkage arms or control rods shall be acceptable.
	e.	Damper will admit up to 100% outdoor air for applicable rooftop units.
	f.	Damper shall close upon indoor (evaporator) fan shutoff and/or loss of power.
	g.	The damper actuator shall plug into the rooftop unit’s wiring harness plug. No hard wiring shall be required.
	h.	Outside air hood shall include aluminum water entrainment filter.
	4.	Manual damper
	a.	Manual damper package shall consist of damper, air inlet screen, and rain hood which can be preset to admit up to 25 or 50% outdoor air for year round ventilation.
	5.	Perfect Humidity Dehumidification System (3 Phase Models Only):
	a.	The Perfect Humidity Dehumidification System shall be factory installed and shall provide greater dehumidification of the occupied space by two modes of dehumidification operations in addition to its normal design cooling mode:
	(1.)	Subcooling mode further sub cools the hot liquid refrigerant leaving the condenser coil when both temperature and humidity in the space are not satisfied.
	(2.)	Hot gas reheat mode shall mix a portion of the hot gas from the discharge of the compressor with the hot liquid refrigerant leaving the condenser coil to create a two-phase heat transfer in the system, resulting in a neutral leaving air temperature when only humidity in the space is not satisfied.
	(3.)	Includes head pressure controller.
	6.	Head Pressure Control Package
	a.	Controller shall control coil head pressure by condenser fan speed modulation or condenser fan cycling and wind baffles.
	b.	Shall consist of solid-state control and condenser coil temperature sensor to maintain condensing temperature between 90°F (32°C) and 110°F (43°C) at outdoor ambient temperatures down to -20°F (-29°C).
	7.	Propane Conversion Kit
	a.	Package shall contain all the necessary hardware and instructions to convert a standard natural gas unit for use with liquefied propane, up to 2000 ft (610m) elevation.
	b.	Additional accessory kits may be required for applications above 2000 ft (610m) elevation.
	8.	Flue Shield
	a.	Flue shield shall provide protection from the hot sides of the gas flue hood.
	9.	Condenser Coil Hail Guard Assembly (Factory installed on 3 Phase Models Only. Field installed on all 3 and 1 Phase Models)
	a.	Shall protect against damage from hail.
	b.	Shall be either hood style or louvered.
	10.	Unit-Mounted, Non-Fused Disconnect Switch (Available on units with MOCP’s of 80 amps or less):
	a.	Switch shall be factory installed, internally mounted.
	b.	National Electric Code (NEC) and UL approved non-fused switch shall provide unit power shutoff.
	c.	Shall be accessible from outside the unit.
	d.	Shall provide local shutdown and lockout capability.
	11.	Convenience Outlet:
	a.	Powered convenience outlet. (3 Phase Models Only)
	(1.)	Outlet shall be powered from main line power to the rooftop unit.
	(2.)	Outlet shall be powered from line side or load side of disconnect by installing contractor, as required by code. If outlet is powered from load side of disconnect, unit electrical ratings shall be UL certified and rated for additional outlet amperage.
	(3.)	Outlet shall be factory installed and internally mounted with easily accessible 115-v female receptacle. 
	(4.)	Outlet shall include 15 amp GFI receptacles with independent fuse protection. 
	(5.)	Voltage required to operate convenience outlet shall be provided by a factory installed step-down transformer. 
	(6.)	Outlet shall be accessible from outside the unit.
	(7.)	Outlet shall include a field installed “Wet in Use” cover.
	b.	Non-Powered convenience outlet.
	(1.)	Outlet shall be powered from a separate 115/120v power source.
	(2.)	A transformer shall not be included.
	(3.)	Outlet shall be factory installed and internally mounted with easily accessible 115-v female receptacle.
	(4.)	Outlet shall include 15 amp GFI receptacles with independent fuse protection. 
	(5.)	Outlet shall be accessible from outside the unit.
	(6.)	Outlet shall include a field installed “Wet in Use” cover.
	12.	Flue Discharge Deflector:
	a.	Flue discharge deflector shall direct unit exhaust vertically instead of horizontally.
	b.	Deflector shall be defined as a “natural draft” device by the National Fuel and Gas (NFG) code.
	13.	Thru-the-Base Connectors:
	a.	Kits shall provide connectors to permit gas and electrical connections to be brought to the unit through the unit basepan.
	b.	Minimum of four connection locations per unit.
	14.	Propeller Power Exhaust:
	a.	Power exhaust shall be used in conjunction with an integrated economizer.
	b.	Independent modules for vertical or horizontal return configurations shall be available.
	c.	Horizontal power exhaust is shall be mounted in return ductwork.
	d.	Power exhaust shall be controlled by economizer controller operation. Exhaust fans shall be energized when dampers open past the 0-100% adjustable setpoint on the economizer control. 
	15.	Roof Curbs (Vertical):
	a.	Full perimeter roof curb with exhaust capability providing separate air streams for energy recovery from the exhaust air without supply air contamination.
	b.	Formed galvanized steel with wood nailer strip and shall be capable of supporting entire unit weight.
	c.	Permits installation and securing of ductwork to curb prior to mounting unit on the curb.
	16.	High Altitude Gas Conversion Kit:
	a.	Package shall contain all the necessary hardware and instructions to convert a standard natural gas unit to operate from 2000-7000 ft (610 to 2134m) elevation with natural gas or from 0-7000 ft (90-2134m) elevation with liquefied propane.
	17.	Outdoor Air Enthalpy Sensor:
	a.	The outdoor air enthalpy sensor shall be used to provide single enthalpy control. When used in conjunction with a return air enthalpy sensor, the unit will provide differential enthalpy control. The sensor allows the unit to determine if outside air is suitable for free cooling.
	18.	Return Air Enthalpy Sensor:
	a.	The return air enthalpy sensor shall be used in conjunction with an outdoor air enthalpy sensor to provide differential enthalpy control.
	19.	Indoor Air Quality (CO2) Sensor:
	a.	Shall be able to provide demand ventilation indoor air quality (IAQ) control.
	b.	The IAQ sensor shall be available in duct mount, wall mount, or wall mount with LED display. The setpoint shall have adjustment capability.
	20.	Smoke detectors (factory installed only):
	a.	Shall be a Four-Wire Controller and Detector.
	b.	Shall be environmental compensated with differential sensing for reliable, stable, and drift-free sensitivity.
	c.	Shall use magnet-activated test/reset sensor switches.
	d.	Shall have tool-less connection terminal access.
	e.	Shall have a recessed momentary switch for testing and resetting the detector.
	f.	Controller shall include:
	(1.)	One set of normally open alarm initiation contacts for connection to an initiating device circuit on a fire alarm control panel.
	(2.)	Two Form-C auxiliary alarm relays for interface with rooftop unit or other equipment.
	(3.)	One Form-C supervision (trouble) relay to control the operation of the Trouble LED on a remote test/reset station.
	(4.)	Capable of direct connection to two individual detector modules.
	(5.)	Can be wired to up to 14 other duct smoke detectors for multiple fan shutdown applications
	21.	Winter start kit
	a.	Shall contain a bypass device around the low pressure switch.
	b.	Shall be required when mechanical cooling is required down to 25°F (-4°C).
	c.	Shall not be required to operate on an economizer when below an outdoor ambient of 40°F (4°C).
	22.	Time Guard
	a.	Shall prevent compressor short-cycling by providing a 5-minute delay (±2 minutes) before restarting a compressor after shutdown for any reason.
	b.	One device shall be required per compressor.
	23.	Hinged Access Panels
	a.	Shall provide easy access through integrated quarter turn latches.
	b.	Shall be on major panels of: filter, control box, fan motor, and compressor.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

©2014 Bryant Heating & Cooling Systems  7310 W. Morris St.  Indianapolis, IN  46231                   Edition Date: 11/14

Catalog No:  GS-PDS-582J-4-6-01

Replaces: New