Addendum_#1_-_230000-HVAC_.pdf

CLAY CO FIRE STATION 24 23 0000-1 HVAC SPECIFICATION

DH Comm. No. 22003

SECTION 23 00 00

HEATING, VENTILATING & AIR CONDITIONING

REVISED PER ADDENDUM #1

PART 1 – GENERAL

1.1 DESCRIPTION OF WORK

A. The General Provisions of the Contract, Division 01, including the General Requirements, Supplementary Conditions and Special Conditions, along with the General Requirements, are hereby made a part of this Section as if fully repeated herein.

B. The Florida Energy Code establishes system commissioning requirements for buildings.

Mechanical systems where mechanical cooling equipment capacity is 480,000 BTUH or greater or heating capacity is 600,000 BTUH or greater shall be commissioned. A complete system test and balance shall be performed, and a certified report shall be submitted to and approved by the Engineer prior to the commencement of functional performance testing.

C. Scope of Work: The scope of the work included under this section of these specifications shall include complete heating, ventilating and air conditioning systems as shown on the drawings and specified herein. This work shall include:

1. Split-system heat pump and compressor/condenser units.

2. Split system air handling units.

3. Dedicated outside air rooftop A/C units with energy recovery.

4. Ductless split systems.

5. Kitchen hoods (including fire suppression system and certification of test).

6. Exhaust fans.

7. Refrigeration piping.

8. Condensate drain piping.

9. Condensate drain pan moisture monitor.

10. Equipment supports, inertia bases, vibration isolators, and identification.

11. Duct work.

12. Insulation.

13. Air distribution equipment.

14. Access doors.

15. Controls and control wiring.

16. Testing, adjusting, and balancing.

17. Plan for pipe sleeve and duct opening locations.

18. Achievement of LEED v4 “Construction Indoor Air Quality Management Plan” credit.

19. Fundamental commissioning for LEED.

20. Instructions of owner's representative.

D. Related Work Specified Elsewhere:

1. Power wiring: Electrical – 26 00 00.

1.2 Prior to start of any work, the successful Contractor shall meet with the Architect to determine that no questions remain concerning the intent of the drawings or specifications. The Contractor shall bring up for discussion and decision any questions

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concerning the project. No work shall be performed prior to this meeting. The Architect shall set the date, time, and place of conference.

1.3 CODES, ORDINANCES AND PERMITS

A. Comply with the latest edition of all codes applicable to the Work of this contract including but not limited to the Florida Energy Efficiency Code, Florida Building Code and Florida Building Code - Mechanical. Obtain information on all code restrictions and requirements. In case of conflict between the contract documents and a governing code or ordinance, such conflict shall be immediately brought to the attention of the Architect for resolution. Extra payment will not be allowed for Work required by code restrictions except through written agreement with the Owner.

B. Apply for, obtain, and pay for all required permits and inspection certificates. Final payment is contingent upon delivery of such certificates to the Architect.

C. Where applicable, all materials and equipment shall bear the Underwriters' Laboratories seal or ASME code stamp. Certificates to this effect shall be furnished to the Architect upon request.

1.4 INDUSTRY STANDARDS

A. Industry Standards: Unless modified by these specifications, the design, manufacture, testing and method of installing all materials, apparatus and equipment shall conform to the following:

1. ASHRAE Standard 90, Energy Conservation in New Building Design.

2. ANSI B9.1 Safety Code for Mechanical Refrigeration.

3. Standards of National Fire Protection Association.

4. ASHRAE Handbook of Fundamentals.

5. SMACNA Standards for Duct work.

6. Associated Air Balance Council or National Environmental Balancing Bureau

Standards for Field Measurement and Instrumentation.

7. Underwriters' Laboratories.

8. National Electrical Code.

9. Air Moving & Conditioning Association.

10. Air Conditioning & Refrigeration Institute.

1.5 SITE INSPECTION

A. Visit the site and thoroughly inspect conditions affecting the Work before submitting bid.

Assume responsibility for meeting all existing conditions including access and workspace limitations.

1.6 DRAWINGS AND SPECIFICATIONS.

A. Refer to the general construction drawings which are bound with the drawings of this Work for construction details, elevations, etc. Architectural and structural drawings shall take precedence over Division 23 drawings (Mechanical Drawings). It is the intent of the Mechanical Drawings to show the general arrangement of the system and not to indicate all offsets, fittings and accessories which may be required, nor to show exact locations of piping, duct work or equipment except where actual dimensions are given. All vertical piping shall be located in walls in finished spaces unless otherwise noted.

B. Specifications and drawings shall be considered as supplementary to each other, requiring materials and labor indicated, specified, or implied by either specifications or drawings. It is the intent of the drawings and specifications to call for finished Work, CLAY CO FIRE STATION 24 23 0000-3 HVAC SPECIFICATION tested, and ready for operation, and in complete conformance with all applicable codes, rules and regulations. Minor details not usually shown or specified, but manifestly necessary for the proper installation and operation of the various systems, shall be included in the Work and in the proposal, the same as if specified or shown on the drawings.

C. If any departures from the drawings and specifications are deemed necessary, details of such departures and the reasons therefore shall be submitted to the Architect for approval. No departures shall be made without prior approval of the Architect.

D. Specific reference in the specifications to any article, device, product, material, fixture or type of construction, etc., by proprietary name, make or catalog number shall be interpreted as establishing a standard of quality and shall not be construed as limiting competition. Substitutes may be used subject to compliance with requirements set forth in the General Requirements, Division 1, and as approved by the Architect.

E. Submit cost implications to contract in bid when providing substitutes for specified equipment and for all alternatives requested in the construction documents.

1.7 MANUFACTURER'S SPECIFICATIONS

A. Where the name of a concern or manufacturer is mentioned on the Drawings or in Specifications in reference to his required service or product, and no qualifications or specification of such is included, then the material gauges, details of manufacturer, finish, etc., shall be in accordance with his standard practice, directions, or specifications. The Contractor shall be responsible for any infringement of patents, royalties, or copyrights which may be incurred thereby.

B. Equipment scheduled on drawings was used to arrive at space, maintenance access, utility service and equipment supports. If other equipment is submitted and approved, take responsibility for maintaining this space for maintenance access, utility service requirements and any revisions required for installation such as equipment supports, roof curbs and access ladders. Take responsibility for the coordination and cost for any resulting changes including cost to change electrical service required by substituted equipment.

C. All materials and equipment shall be new and first class in every respect. As far as is practical, similar products shall be by one manufacturer. Equipment designed to operate as a system such as outdoor condenser or heat pump units with indoor air handling units shall be from one manufacturer unless scheduled otherwise.

1.8 SUBMITTALS

A. Submit shop drawings in accordance with the General Requirements, Division 1.

B. Samples of insulation, diffusers, dampers or any other mechanical equipment or materials shall be submitted if requested by the Architect. If a sample is requested, have the sample delivered to the Architect or arrange for the Architect to examine it elsewhere. Failure to comply may be cause for rejection.

C. Submit shop drawings or catalog data for the Architect's approval before purchasing or installing the following:

1. Split-system compressor/condenser and heat pump units.

2. Air handling units.

3. Dedicated outside air rooftop A/C units with energy recovery.

4. Ductless split systems.

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5. Exhaust fans.

6. Grilles, diffusers and registers.

7. Duct shop drawing (where different from design drawing).

8. Piping shop drawing (where different from design drawing).

9. Insulation.

10. Kitchen hoods (including fire suppression system).

11. Vibration isolators and inertia bases.

12. Controls and wiring diagrams.

D. Submit detailed and dimension plan showing all pipe sleeves and duct openings required in building structure including floors and roof deck.

1.9 PERFORMANCE DATA

A. All performance data specified herein shall be considered actual performance of equipment as installed. Make suitable allowances if installation details are such that actual operating conditions unfavorably affect performance as compared to conditions under which the equipment was rated.

1.10 CATALOG, OPERATION AND MAINTENANCE DATA

A. Provide four (4) complete sets of a compilation of catalog data of each manufactured item of equipment used in the Mechanical Work. In addition to the catalog data, installation, operating and maintenance data and bill of materials for all operating equipment shall be submitted. Each of the four sets of data shall be bound in loose leaf binders and submitted to the Architect before final payment is made. A complete double index shall be provided as follows:

1. Listing the products alphabetically by name.

2. Listing the names of manufacturers alphabetically by name together with their addresses and the names and addresses of local sales representatives.

B. It is the intent of this catalog, operation, and maintenance data to provide the Owner with complete instructions on the proper operation and use, lubrication and periodic maintenance, together with the source of replacement parts and service, for the items of equipment covered.

1.11 CONTRACTOR COORDINATION

A. The Electrical Contractor will furnish, set and wire all disconnect devices and starters as required for all equipment except for those items furnished with integral disconnect devices and/or starters.

B. Furnish detailed information to the Electrical Contractor on power wiring requirements for all mechanical equipment purchased as soon as practical. This shall include all diagrams and instructions necessary for the Electrical Contractor to make connections properly. If equipment purchased requires larger electrical service than equipment scheduled, arrange, and pay for required electrical service change.

C. Provide all air conditioning control devices, including DDC controllers, interface devices, thermostats, temperature sensors, monitoring devices, and complete all control wiring, including final connections.

D. When the project scope includes installation of kitchen hoods, including hoods that are furnished by others, take responsibility to coordinate the hood installation with the General Contractor to make sure the wall construction meets the Building Code clearance requirements for the type of hood purchased.

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E. Coordinate location of equipment, piping, and duct work with Electrical Contractor, Fire Protection Contractor, and Plumbing Contractor to maintain clearance for equipment maintenance, prevent interference with duct and piping runs, and to prevent ducts and piping from being installed over electrical panels. If interference develops, the Architect will decide which equipment, conduit, duct, piping, etc., must be relocated regardless of installation order. Take responsibility for relocating Mechanical work, if so ordered, including all associated costs.

F. Within 30 days following award of the contract, report to the Architect in writing, all real or potential errors, ambiguities and/or conflicts on the Mechanical Work or between the trades and obtain an agreement with the Architect on a solution. Those reported after 30 days, except as a result of unforeseen circumstances, shall be resolved at the discretion of the Architect. Report conflicts resulting from the progress of Work to the Architect immediately or accept the expense for corrective work caused by failure to report such a conflict.

1.12 CHANGES

A. Do not make any changes in design without the written approval of the Architect.

Changes in design means any change which will affect the capacity, reliability, operation or safety of the systems or any parts thereof, including changes which may be required to conform to local regulations or codes.

1.13 MECHANICAL CONTRACTOR'S WARRANTY

A. Provide written warranties as specified in the General Requirements, Division 1, and provide a five year warranty for all refrigeration compressors against defects in materials and workmanship. Repair any defects becoming apparent within the warranty period as directed by the Architect.

1.14 PROTECTION OF MATERIALS AND EQUIPMENT

A. Provide complete protection against weather, rain, windstorms, frost, ice, heat, and acts of vandalism, so as to maintain all materials and equipment free from injury or damage, including physical damage of any nature. At end of each workday, cover work as required to provide such protection. This shall include but not be limited to erection of all temporary shelters to protect adequately any materials and equipment stored on site, cribbing of any materials and equipment above the floor of the construction, and the covering of materials and equipment in the building under construction with protective covering.

B. Provide dry storage facilities for materials and equipment; including but not limited to duct work, insulation, air handling units, controls, motor operated equipment, etc.;

sensitive to damage by moisture. Outside, unprotected storage will not be accepted.

Storage inside building being constructed will not be accepted until roof and walls are weather tight unless temporary protection is provided.

C. Failure to comply shall be sufficient cause for rejection of damaged materials and equipment. Replace any damaged material or equipment and place the systems in perfect working condition.

PART 2 – PRODUCTS

2.1 SPLIT SYSTEM AIR-CONDITIONING AND HEAT PUMP UNITS - 2 SPEED

A. Manufacturers: Basis of Design is Carrier. Approved equals meeting all specified criteria are Daikin AC, Lennox, Trane, and York.

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B. Capacity shall be as scheduled on the drawings and adjusted for line losses of refrigerant piping. Capacity shall be combined rating at actual conditions entering the evaporator and 95 degrees F outdoor ambient temperature.

C. Unit shall have all operating components assembled on one common base. These shall include compressor, condenser coil, condenser fan and motor, charging valves, all controls, and a holding charge of refrigerant. Units shall be designed for outdoor installation with all exterior surfaces factory painted with primer and enamel for weather protection. Drain holes shall be provided for elimination of rain. Provide removable panels for access to components.

D. Condenser coil shall be of the continuous aluminum plate fin and copper tube type and shall be circuited for integral sub-cooler. The coil shall be tested with refrigerant and sealed with a holding charge of refrigerant.

E. Compressor shall be 2 speed and shall be mounted on vibration isolators.

F. Refrigeration circuit components shall include liquid line service valve, suction line service valve, and full charge of compressor oil and holding charge of refrigerant.

G. Controls shall be mounted in separate panel on the side of the unit for installation and service access. Units shall be provided with controls specified on the drawings and all standard controls including the following even if not considered standard:

1. Single point power connection.

2. Compressor and fan contactors.

3. Motor overload protection for ungrounded legs.

4. High pressure cut-out.

5. Auto reset low-pressure switch to stop compressor if refrigerant pressure drops below 7 psig.

6. Compressor anti-cycling relays set between 3 and 5 minutes.

7. Low-ambient controller down to 30º F. for winter operation.

8. Evaporator freeze thermostat to stop unit operation if evaporator reaches freeze-up conditions.

9. Indoor time delay relay to continue indoor blower motor after compressor cycles off.

10. Adjustable outdoor thermostat to prevent supplemental electric heat from operating except during defrost mode or when outside air temperature is below set-point (40 F).

11. Service alarm to signal compressor not operating during heating mode with indicating light on indoor thermostat.

12. Low voltage and phase loss protective controls for all three phase motors.

2.2 AIR HANDLING UNITS - VARIABLE SPEED

A. Manufacturers: Basis of Design is Carrier. Approved equals meeting all specified criteria are Daikin AC, Lennox, Trane, and York.

B. Air handling units shall be draw through type with 1" thick, MERV 13, standard size, disposable type filters and shall have DX cooling coils and electric heating coils as scheduled on drawings with minimum unit capacities as indicated.

C. Fan capacities shall be as scheduled on drawings. Fans shall be direct drive with variable speed motors. Fans and motors shall be mounted on vibration isolators.

D. Casing shall be constructed of heavy duty, factory painted, galvanized sheet steel adequately reinforced with structural members. Units shall include plastic drain pan, with at least 1" thick insulation, extending under coil and fan sections with brass drain

CLAY CO FIRE STATION 24 23 0000-7 HVAC SPECIFICATION

connection. Removable panels in front of unit shall provide access to all internal parts.

Units shall have filter access panel and filter rack. All unit panels shall be internally insulated to meet requirements of the Florida Energy Code. All insulating materials shall meet the requirements of NFPA 90-A. Units shall be equipped with duct collars on intake and discharge of unit and single point power connection.

E. Direct expansion cooling coils shall be of the continuous aluminum plate fin and copper tube type and shall have an equalizing type distributor. The coil shall be tested with refrigerant and sealed with a holding charge of nitrogen at 10 PSIG.

F. Electric heating coil shall be factory installed and protected with air flow switch. Heaters over 10 KW shall have heating elements sequenced on and off in at least two stages and shall be wired for multiple stage operation. All heaters shall be equipped with manual reset thermal overload device, current overload for heaters above 10 KW and required heating and cooling system controls including 60 va control circuit (24 v) transformer. Low-voltage connections shall be point-to-point on terminal board.

G. Unit controls shall include but not be limited to solid-state interlock control board, control transformer, and evaporator freeze thermostat. Wall mounted humidistat and thermostat shall control fan speed.

H. Unit shall have refrigerant leak detection, configured to turn supply fan on in the event of a refrigerant leak.

2.3 DEDICATED OUTSIDE AIR ROOFTOP A/C UNIT WITH ENERGY RECOVERY

A. Manufacturers: Basis of design is Aaon. Substitute equipment may be considered for approval that includes at a minimum:

1. R-454b refrigerant

2. Variable capacity compressor with 10-100% capacity control

3. Direct drive supply fans

4. Double wall cabinet construction

5. Insulation with a minimum R-value of 13

6. Stainless steel drain pans

B. General Description

1. Packaged rooftop unit shall include compressors, evaporator coils, filters, supply fans, dampers, air-cooled condenser coils, condenser fans, reheat coil, electric heaters, exhaust fans, energy recovery wheels, and unit controls.

2. Unit shall be factory assembled and tested including leak testing of the DX coils, pressure testing of the refrigeration circuit, and run testing of the completed unit.

Run test report shall be supplied with the unit in the service compartment’s literature pocket.

3. Unit shall have decals and tags to indicate lifting and rigging, service areas and caution areas for safety and to assist service personnel.

4. Unit components shall be labeled, including refrigeration system components, and electrical and controls components.

5. Estimated sound power levels (dB) shall be shown on the unit ratings sheet.

6. Installation, Operation, and Maintenance manual shall be supplied within the unit.

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7. Laminated color-coded wiring diagram shall match factory installed wiring and shall be affixed to the interior of the control compartment’s hinged access door.

8. Unit nameplate shall be provided in two locations on the unit, affixed to the exterior of the unit and affixed to the interior of the control compartment’s hinged access door.

C. Construction

1. All cabinet walls, access doors, and roof shall be fabricated of double wall, impact resistant, rigid polyurethane foam panels.

2. Unit insulation shall have a minimum thermal resistance R-value of 13. Foam insulation shall have a minimum density of 2 pounds/cubic foot and shall be tested in accordance with ASTM D1929-11 for a minimum flash ignition temperature of 610°F.

3. Unit construction shall be double wall with G90 galvanized steel on both sides and a thermal break. Double wall construction with a thermal break prevents moisture accumulation on the insulation, provides a cleanable interior, reduces heat transfer through the panel, and prevents exterior condensation on the panel.

4. Unit shall be designed to reduce air leakage and infiltration through the cabinet.

Cabinet leakage shall not exceed 1% of total airflow when tested at 3 times the minimum external static pressure provided in AHRI Standard 340/360. Panel deflection shall not exceed L/240 ratio at 125% of design static pressure, at a maximum 8 inches of positive or negative static pressure, to reduce air leakage.

Deflection shall be measured at the midpoint of the panel height and width.

Continuous sealing shall be included between panels and between access doors and openings to reduce air leakage. Piping and electrical conduit through cabinet panels shall include sealing to reduce air leakage.

5. Roof of the air tunnel shall be sloped to provide complete drainage. Cabinet shall have rain break overhangs above access doors.

6. Access to filters, dampers, cooling coils, reheat coil, heaters, energy recovery wheels, compressors, and electrical and controls components shall be through hinged access doors with quarter turn, zinc cast, lockable handles. Full length stainless steel piano hinges shall be included on the doors.

7. Exterior paint finish shall be capable of withstanding at least 2,500 hours, with no visible corrosive effects, when tested in a salt spray and fog atmosphere in accordance with ASTM B 117-95 test procedure.

8. Units with cooling coils shall include double sloped 304 stainless steel drain pans.

9. Unit shall be provided with base discharge and return air openings. All openings through the base pan of the unit shall have upturned flanges of at least 1/2 inch in height around the opening.

10. Unit shall include lifting lugs on the top of the unit.

11. Unit shall include factory installed, painted galvanized steel condenser coil guards on the face of the condenser coil.

D. Electrical

1. Unit shall have a 5kAIC SCCR.

CLAY CO FIRE STATION 24 23 0000-9 HVAC SPECIFICATION

2. Unit shall be provided with factory installed and factory wired, non-fused disconnect switch.

3. Unit shall be provided with a factory installed and factory wired 115V, 12 amp GFI outlet disconnect switch in the unit control panel.

4. Unit shall be provided with phase and brown out protection which shuts down all motors in the unit if the electrical phases are more than 10% out of balance on voltage, the voltage is more than 10% under design voltage or on phase reversal.

E. Supply Fans

1. Unit shall include direct drive, unhoused, backward curved, plenum supply fans.

2. Blowers and motors shall be dynamically balance and mounted on rubber isolators.

3. Motors shall be premium efficiency ODP with ball bearings rated for 200,000 hours service with external lubrication points.

4. Variable frequency drives shall be factory wired and mounted in the unit. Fan motors shall be premium efficiency.

F. Exhaust Fans

1. Exhaust dampers shall be sized for 100% relief.

2. Fans and motors shall be dynamically balanced.

3. Unit shall include barometric relief dampers.

4. Motors shall be premium efficiency ODP with ball bearings rated for 200,000 hours service with external lubrication points.

5. Access to exhaust fans shall be through double wall, hinged access doors with quarter turn lockable handles.

6. Unit shall include belt driven, unhoused, backward curved, plenum exhaust fans.

7. Variable frequency drives shall be factory wired and mounted in the unit. Fan motors shall be premium efficiency.

G. Cooling Coils

1. Evaporator Coils

a. Coils shall be designed for use with R-454b refrigerant and constructed of copper tubes with aluminum fins mechanically bonded to the tubes and galvanized steel end casings. Fin design shall be sine wave rippled.

b. Coil shall be standard capacity.

c. Coils shall be hydrogen or helium leak tested.

d. Coils shall be furnished with factory installed expansion valves.

H. Refrigeration System

1. Unit shall be factory charged with R-454b refrigerant.

2. Compressors shall be scroll type with thermal overload protection and carry a 5 year non-prorated warranty, from the date of original equipment shipment from the factory.

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3. Compressors shall be mounted in an isolated service compartment which can be accessed without affecting unit operation. Lockable hinged compressor access doors shall be fabricated of double wall, rigid polyurethane foam injected panels to prevent the transmission of noise outside the cabinet.

4. Compressors shall be isolated from the base pan with the compressor manufacturer’s recommended rubber vibration isolators, to reduce any transmission of noise from the compressors into the building area.

5. Each refrigeration circuit shall be equipped with expansion valve type refrigerant flow control.

6. Each refrigeration circuit shall be equipped with automatic reset low pressure and manual reset high pressure refrigerant safety controls, Schrader type service fittings on both the high pressure and low pressure sides and a factory installed liquid line filter driers.

7. Unit shall include a variable capacity scroll compressor on the refrigeration circuit which shall be capable of modulation from 10-100% of its capacity.

8. Refrigeration circuit shall be provided with hot gas reheat coil, modulating valves, electronic controller, supply air temperature sensor and a control signal terminal which allow the unit to have a dehumidification mode of operation, which includes supply air temperature control to prevent supply air temperature swings and overcooling of the space.

9. The factory installed controls shall include a 3 minute off delay timer to prevent compressor short cycling. The controls shall also include an adjustable, 20 second delay timer for each additional capacity stage to prevent multiple capacity stages from starting simultaneously and adjustable compressor lock out.

10. Unit shall have refrigerant leak detection, configured to turn supply fan on in the event of a refrigerant leak.

I. Condensers

1. Air-Cooled Condenser

a. Condenser fans shall be a vertical discharge, axial flow, direct drive fans.

b. Coils shall be designed for use with R-454b refrigerant. Coils shall be multi-pass and fabricated from aluminum microchannel tubes.

c. Coils shall be designed for a minimum of 10°F of refrigerant sub-cooling.

d. Coils shall be hydrogen or helium leak tested.

J. Electric Heating

1. Unit shall include an electric heater consisting of electric heating coils, fuses and a high temperature limit switch, with capacities as shown on the plans.

2. Electric heating coils shall be located in the reheat position downstream of the cooling coil.

3. Electric heater shall have full modulation capacity controlled by an SCR (Silicon Controlled Rectifier). A 0-10 VDC heating control signal shall be field provided to control the amount of heating.

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K. Filters

1. Unit shall include 2 inch thick, pleated panel filters with an ASHRAE MERV rating of 13, upstream of the cooling coil.

2. Unit shall include 1 inch aluminum mesh pre filters upstream of the outside air opening.

3. Unit shall include a clogged filter switch.

L. Outside Air/Economizer

1. Unit shall include 0-100% economizer consisting of a motor operated outside air damper and return air damper assembly constructed of extruded aluminum, hollow core, airfoil blades with rubber edge seals and aluminum end seals. Damper blades shall be gear driven and designed to have no more than 20 cfm of leakage per sq

ft. at 4 in. w.g. air pressure differential across the damper. Low leakage dampers shall be Class 2 AMCA certified, in accordance with AMCA Standard 511. Damper assembly shall be controlled by spring return actuator. Unit shall include outside air opening bird screen, outside air hood, and relief dampers.

M. Energy Recovery

1. Unit shall contain a factory mounted and tested energy recovery wheel. The energy recovery wheel shall be mounted in a rigid frame containing the wheel drive motor, drive belt, wheel seals and bearings. Frame shall slide out for service and removal from the cabinet.

2. The energy recovery component shall incorporate a rotary wheel in an insulated cassette frame complete with seals, drive motor and drive belt.

3. The energy recovery cassette shall be an Underwriters Laboratories Recognized Component for electrical and fire safety. The wheel drive motor shall be an Underwriters Laboratory Recognized Component and shall be mounted in the cassette frame and supplied with a service connector or junction box. Thermal performance shall be certified by the manufacturer in accordance with ASHRAE Standard 84, Method of Testing Air-to-Air Heat Exchangers and AHRI Standard 1060, Rating Air-to-Air Energy Recovery Ventilation Equipment. Cassettes shall be listed in the AHRI Certified Products.

4. Unit shall include 2 inch thick, pleated panel outside air and exhaust air filters with an ASHRAE MERV rating of 8, upstream of the wheels.

5. Hinged service access doors shall allow access to the wheel.

a. Aluminum Energy Recovery Wheels

1) Unit shall contain a factory mounted and tested monolithic aluminum energy recovery wheel with an inverter duty motor and a durable segmented link drive belt composite. Wheel frame shall be constructed with prime G90 hot-dip galvanized steel tested for corrosion resistance of 400 hours of salt spray.

2) Aluminum Energy recovery wheel shall be covered under the standard AAON limited parts warranty; the first 12 months from the date of equipment startup, or 18 months from the date of original equipment shipment from the factory, whichever is less. Warranty shall cover material and workmanship that prove defective, within the specified warranty period, CLAY CO FIRE STATION 24 23 0000-12 HVAC SPECIFICATION provided the written instructions for installation, operation and maintenance have been followed. Warranty excludes parts associated with routine maintenance, such as belts.

3) Total energy recovery wheels shall be made of corrugated aluminum with a 3A molecular sieve desiccant coating. Coated segments shall be cleanable with hot water or compressed air without degrading the latent recovery.

N. Controls

1. Factory Installed and Factory Provided Controller

a. Unit controller shall be capable of controlling all features and options of the unit.

Controller shall be factory installed in the unit controls compartment and factory tested. Controller shall be capable of standalone operation with unit configuration, setpoint adjustment, sensor status viewing, unit alarm viewing, and occupancy scheduling available without dependence on a building management system.

b. Controller shall have an onboard clock and calendar functions that allow for occupancy scheduling.

c. Controller shall include non-volatile memory to retain all programmed values without the use of a battery, in the event of a power failure.

d. Makeup Air Controller

1) Unit shall modulate cooling with constant airflow to meet ventilation outside air loads. Cooling capacity shall modulate based on supply air temperature.

2) With modulating hot gas reheat, unit shall modulate cooling and hot gas reheat as efficiently as possible, to meet outside air humidity loads and prevent supply air temperature swings and overcooling of the space.

3) Unit shall modulate heating with constant airflow to meet ventilation outside air loads. Heating capacity shall modulate based on supply air temperature.

e. Unit configuration, setpoint adjustment, sensor status viewing, unit alarm viewing, and occupancy scheduling shall be accomplished with connection to interface module with LCD screen and input keypad, interface module with touch screen, or with connection to PC with free configuration software.

Controller shall be capable of connection with other factory installed and factory provided unit controllers with individual unit configuration, setpoint adjustment, sensor status viewing, and occupancy scheduling available from a single unit.

Connection between unit controllers shall be with a modular cable. Controller shall be capable of communicating and integrating with a LonWorks or BACnet network. [Orion Controls System]

2. Unit shall be provided with a high condensate level switch that shuts down the unit when a high water level is detected in the drain pan.

2.4 DUCTLESS SPLIT AIR-CONDITIONING/HEAT PUMPS AND AIR HANDLERS

A. Manufacturers: Basis of Design is Mitsubishi. Approved equals meeting all specified criteria are: Daikin Applied, EMI, Fujitsu, Sanyo, LG.

B. Capacity shall be as scheduled on the drawings and adjusted for line losses of refrigerant piping. Capacity shall be combined rating at actual conditions entering the evaporator and 95 degrees F outdoor ambient temperature.

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C. Air handling units shall be draw through type with 1" thick, standard size, disposable type filters (with MERV ratings as indicated on schedule) and shall have DX cooling coils and electric heating coils as scheduled on drawings with minimum unit capacities as indicated. Fan capacities shall be as scheduled on drawings. Fans shall be direct drive with two or three speed motors or belt drive as scheduled. Fans and motors shall be mounted on vibration isolators. Casing shall be constructed of heavy duty, factory painted, galvanized sheet steel adequately reinforced with structural members. All unit panels shall be internally insulated to meet requirements of the Florida Energy Code. All insulating materials shall meet the requirements of NFPA 90-A. Units shall be equipped with single point power connection. Provide integral condensate pumps when scheduled.

D. The compressor shall be a direct current rotary and/or scroll compressor with Variable Compressor Speed Inverter Technology. The compressor shall be driven by inverter circuit to control compressor speed. The compressor speed shall dynamically vary to match the room load for significantly increasing the efficiency of the system which results in vast energy savings. The outdoor unit shall have an accumulator and high pressure safety switch. The compressor shall be mounted to avoid the transmission of vibration

E. Electric heating coil shall be factory installed and protected with air flow switch. Heaters over 10 KW shall have heating elements sequenced on and off in stages not exceeding 10 KW per stage and shall be wired for multiple stage operation. All heaters shall be equipped with manual reset thermal overload device, current overload for heaters above 10 KW and required heating and cooling system controls including 60 va control circuit (24 v) transformer. Low-voltage connections shall be point-to-point on terminal board.

F. Condenser Unit shall have all operating components assembled on one common base.

These shall include: compressor, condenser coil, condenser fan and motor, charging valves, all controls, and a holding charge of refrigerant. Units shall be designed for outdoor installation with all exterior surfaces factory painted with primer and enamel for weather protection. Drain holes shall be provided for elimination of rain. Provide removable panels for access to components.

G. Refrigeration circuit components shall include liquid line service valve, suction line service valve, and full charge of compressor oil and holding charge of refrigerant.

H. System shall be provided with controls specified on the drawings and all standard controls including the following even if not considered standard:

1. Single point power connection.

2. Compressor and fan contactors.

3. Motor overload protection for ungrounded legs.

4. Crankcase oil heater.

5. High pressure cut-out.

6. Auto reset low-pressure switch to stop compressor if refrigerant pressure drops below 7 psig.

7. 24 volt transformer for unit controls.

8. Compressor anti-cycling relays set between 3 and 5 minutes.

9. Low-ambient controller down to 30° F. for winter operation.

CLAY CO FIRE STATION 24 23 0000-14 HVAC SPECIFICATION

10. Evaporator freeze thermostat to stop unit operation if evaporator reaches freeze-up conditions.

11. Isolation relay to remove low-ambient controller out of condenser fan circuit during heating mode.

12. Indoor time delay relay to continue indoor blower motor after compressor cycles off.

13. Refrigerant filter dryer (two-way for heat pumps).

14. Adjustable outdoor thermostat to prevent supplemental electric heat from operating except during defrost mode or when outside air temperature is below set-point (40 F).

15. Thermostatic expansion valve kit.

16. Liquid solenoid valve to stop and start liquid refrigerant flow in response to compressor operation.

17. Service alarm for heat pumps to signal compressor not operating during heating mode with indicating light on indoor thermostat.

18. Dry Mode control operation for humidity control.

19. Condensate overflow switch to turn off unit in the event of condensate overflow.

20. Unit shall have refrigerant leak detection, configured to turn supply fan on in the event of a refrigerant leak.

2.5 INLINE EXHAUST FANS

A. Manufacturers: Basis of Design is Loren Cook. Approved equals meeting all specified criteria are Acme, Aerovent, American Coolair, Greenheck, Hartzell, Penn Ventilator, Swartwout, and Twin City.

B. Fans shall be of size, type and capacity indicated on the drawings. Power supply shall be as scheduled. The complete units shall be approved by the Underwriters' Laboratories and be in full accordance with all provisions of the National Electric Code.

C. Provide fan with internal integral thermal protector and unit mounted disconnect.

D. Pre-wired, factory mounted speed controller for direct drive units.

2.6 CENTRIFUGAL ROOF EXHAUST FANS

A. Manufacturers: Basis of Design is Loren Cook for EF-1, and Captiveaire for EF-HOOD.

Approved equals meeting all specified criteria are Acme, Aerovent, American Coolair, Greenheck, Hartzell, Penn Ventilator, Swartwout, and Twin City.

B. Centrifugal roof exhaust fans shall be fully enclosed, single width, single inlet, round, with drive, capacity, and electrical characteristics as scheduled on drawings. Complete units shall be approved by the Underwriters' Laboratories and be in full accordance with all provisions of the National Electric Code.

C. Fan wheels shall be backward curved, hollow airfoil blade, non-overloading, aluminum impellers, rigidly constructed to resist torsional stresses. Fan shall be statically and dynamically balanced. Motor shall be supported on vibration isolators on rigid structural frame. Equivalent fan selections shall not change motor horsepower (wattage), increase noise level by more than 10 % or increase inlet air velocity by more than 20% from fan scheduled on drawings.

CLAY CO FIRE STATION 24 23 0000-15 HVAC SPECIFICATION

D. Housing shall be constructed of heavy gauge aluminum with external fasteners of stainless steel. All other parts shall be zinc plated and chromate treated steel to prevent corrosion. Motors shall be located out of exhaust air stream. Inlet rings shall be smoothly contoured to reduce turbulence. All non-aluminum parts shall be factory primed and painted inside and out including fan wheel.

E. Accessories shall include the following:

1. Unit mounted and factory wired disconnect switch.

2. Back-draft damper with extruded aluminum frame and blades complete with extruded vinyl edge seals locked into blade edges. Damper shall have adjustable counterbalance for vertical air flow with pressure differential range of 0.01 to 0.05 inches W.G.

3. Pre-wired, factory mounted speed controller for direct drive units.

4. Extruded aluminum safety guard frame with bird screen and removable for motor and fan access.

5. Factory fabricated roof curbs with minimum height of 8 inches and foam rubber gasket on top surface. Curb shall be completely insulated with at least 1-1/2" thick, 3 pcf density, fiberglass insulation. Frame shall be heavy gauge steel with welded joints and hot dip galvanized after fabrication. Roof curb shall be designed to compensate for roof slope such that top of curb is level in all directions.

2.7 CEILING EXHAUST FANS

A. Manufacturers: Basis of Design is Loren Cook. Approved equals meeting all specified criteria are Acme, Aerovent, American Coolair, Greenheck, Hartzell, Penn Ventilator, Swartwout, and Twin City.

B. Fans shall be of size, type and capacity indicated on the drawings. Power supply shall be as scheduled. The complete units shall be approved by the Underwriters' Laboratories and be in full accordance with all provisions of the National Electric Code.

C. Provide fan with internal integral thermal protector and unit mounted disconnect.

D. Pre-wired, factory mounted speed controller for direct drive units.

2.8 ELECTRIC WALL HEATERS

A. Basis of design is Qmark. Approved equals meeting all specified criteria are Markel, Marley, Reznor.

B. Provide electric resistance wall heaters of capacities indicated on drawings. Heating elements shall be nickel chromium alloy properly insulated and supported. Fan motor shall be totally enclosed, permanently lubricated, and provided with thermal overload protection.

C. Provide unit with built-in, tamper resistant thermostat, manual reset thermal overheat protector, and power disconnect switch. Assembly shall be approved by Underwriters' Laboratories and with all provisions of the National Electric Code.

2.9 ELECTRIC UNIT HEATERS

A. Basis of design is Qmark. Approved equals meeting all specified criteria are Markel, Marley, Reznor.

CLAY CO FIRE STATION 24 23 0000-16 HVAC SPECIFICATION

B. Heaters shall be metal sheath fin tubes with built-in control contactor series wired with automatic reset overheat cutout, totally-enclosed motor, continuous fan duty, all angle operations with thermal overload protection and with capacity scheduled on drawings.

C. Motor shall be protected from heating element radiation by baffle between motor and element.

D. Fan to be aluminum, directly connected to motor, and dynamically balanced.

Heater to be provided with welded mounting frame having mounting holes. All metal surface casing shall be phosphate coated to resist corrosion and finished in baked enamel.

E. Unit will be provided with internal thermostat and unit mounted disconnect switch.

Heater shall be equal to Qmark.

2.10 KITCHEN HOOD

A. Basis of Design is Captiveaire. Other approved hood manufacturers are Aerolator Systems, Inc., Mechanical Services (Grease Master), and Engineered Kitchen Ventilation Systems (Savonair).

B. Hood shall be Model WRH, backshelf-style type exhaust-only hood as manufactured by Captive-aire Systems. Unit shall be 36" wide X 24" deep. Other approved hood manufacturers are Aerolator Systems, Inc., Mechanical Services (Grease Master), and Engineered Kitchen Ventilation Systems (Savonair).

C. Hood shall be single wall type fabricated of Type 430 stainless steel with #3 or #4 polish finish on all exposed surfaces. All seams and joints shall be heliarc welded and polished to blend. Hood shall be configured to mount from wall cleats.

Construction shall be in accordance with U.L. (classification #91G6), U.L.C., N.F.P.A. #96, N.S.F. #1362, B.O.C.A. #86-48, S.B.C.C.I. #8675, and I.C.B.O.

#4416.

D. Provide following options:

1. Utility Cabinet: Integral cabinet fabricated of same material and finish as hood to house pre-piped fire suppression system and UL listed, pre-wired electrical controls. Pre-wire package contains light switches, lighted fan control switches, and internal factory wiring components including starters, relays, etc. Terminal box shall consist of numbered terminal strip with all factory wiring color coded and numbered, and wiring diagram.

2. Standoff: Integral 1" insulated air space provided to meet NFPA 96 clearance requirements against combustible walls.

3. Enclosure Panels: Enclosure panels, factory fabricated of same material and finish as hood, and designed for field installation, sized to extend from top of hood to ceiling.

4. End Panels: End panels, factory fabricated of same material and finish as hood.

CLAY CO FIRE STATION 24 23 0000-17 HVAC SPECIFICATION

E. Hood lights shall be U.L. Listed suitable for grease hood applications and shall be supplied with plastic coated glass globes. Each light shall accommodate a single standard 100 watt bulb and shall be pre-wired to junction boxes on top of hood.

F. Hood grease drain system shall consist of removable ½ pint cup grease collector and U.L. Classified, flame guard, stainless steel (Teflon coated), baffle type filters designed for easy removal and cleaning.Hood shall contain water-based fire suppression system which shall be designed for the duct and equipment. Fire suppression system shall be completely factory pre-piped. Field hook-up and testing shall be completed by qualified fire system personnel after hood installation and shall be certified to meet applicable code requirements. Copy of certificate shall be provided to the Architect. System shall be capable of automatic detection and actuation and with local or remote manual actuation.

System shall include an auxiliary contact (minimum 4 pole double throw switch) for connection to fire alarm system and to provide automatic shut-off for electric grille and frier.

2.11 REFRIGERANT PIPING AND ACCESSORIES

A. Piping shall be type "L" hard drawn copper with wrought copper, refrigerant grade fittings. All elbows shall be long radius.

B. Moisture indicator shall be installed in the liquid line just before the refrigerant solenoid valve. Thermostatic expansion valves shall be provided for each evaporator circuit.

Valves shall be equipped with external equalizer.

2.12 CONDENSATE DRAIN PIPING AND SECONDARY DRAIN PAN

A. Condensate piping located outside building shall be non-insulated copper. Condensate piping located inside building shall be insulated copper. Condensate piping located above ceilings shall be insulated schedule 40 polyvinyl (PVC). Non-insulated piping located above ceilings, whether used for return or supply air plenums or not, will not be allowed.

B. Condensate drain trap float switch shall be "EZ-TRAP" model EZT-225 or approved equal. (EZ TRAP 3 Kellogg Court, Unit 10, Edison, NJ 08817 phone 732-248-8066).

2.13 ROOFTOP UNIT CONDENSATE DRAIN PAN CABLE-TYPE MOISTURE MONITOR

A. Rooftop units shall be provided with moisture monitor to shut down unit in the event of condensate overflow. Moisture monitor shall be Liebert “Liqui-tect 460” or approved equal. Unit shall have main module with wiring termination and configuration setting, and attachable moisture detection cable of required length. Moisture detection cable shall be clipped around drain pan in such a manner that any overflow or blow-out of water will be detected by cable, especially before water is able to discharge into supply or return ducts. Unit shall be powered at 24 VAC and have two (2) Form-C dry contacts rated at 24 VAC @ 3 amps.

2.14 PIPE HANGERS

A. Pipe hangers for refrigerant and condensate piping located inside building shall be non-metallic strap hangers designed to rigidly support piping without damage to pipe insulation.

CLAY CO FIRE STATION 24 23 0000-18 HVAC SPECIFICATION

B. Pipe hangers shall be Auto-Grip, Fee and Mason, Grinnel, galvanized steel clevis hangers, roller or fixed as shown on drawings, selected within the manufacturer's published load ratings.

C. Hanger rods shall be at least:

Pipe to 2" 3/8" diameter 2-1/2" to 3" 1/2" diameter 4" to 5" 5/8" diameter 6" 3/4" diameter 8" and larger 7/8" diameter

D. Rods for trapeze hangers supporting several pipes shall be sized for the equipment load.

E. Hangers for copper pipe shall be either copper-plated type or there shall be a shield of 4 pounds sheet lead to completely surround the pipe to prevent direct contact with the hanger.

F. Supports for pipes with vapor barrier type covering shall not contact the pipe but shall surround the unbroken covering. Provide galvanized steel shields with mitered corners properly formed to the jacket outside diameter between hanger clevises and the lower 1/3 of the circumference. Size shields as follows:

Pipe up to 1" 18 gauge x 8" long 1-1/4" to 2" 16 gauge x 12" long 2-1/2" to 4" 14 gauge x 16" long 5" and larger…