Specs_Vol 2_2026-08-18.pdf

DEPARTMENT OF VETERAN’S AFFAIRS

ROYAL C. JOHNSON VETERANS MEMORIAL MEDICAL CENTER

RENOVATE FIRST FLOOR FOR NEW KITCHEN FOR THE

SIOUX FALLS VA MEDICAL CENTER

Sioux Falls, South Dakota

VA Project # 438-21-403

Project Specifications – Volume 2 August 18, 2026

RENOVATE 1ST FLOOR NEW KITCHEN 438-21-403 12-21-21

00 01 10-1

DEPARTMENT OF VETERANS AFFAIRS

VHA MASTER SPECIFICATIONS

TABLE OF CONTENTS

Section 00 01 10

SECTION NO. DIVISION AND SECTION TITLES DATE

DIVISION 00 - SPECIAL SECTIONS

00 01 07 Seals Page

00 01 15 List of Drawing Sheets 05-20

DIVISION 01 - GENERAL REQUIREMENTS

01 00 00 General Requirements 11-21

01 32 16.13 Network Analysis Schedules – Major Construction Project

Design-Bid-Build

03-20

01 33 23 Shop Drawings, Product Data, and Samples 06-21

01 35 26 Safety Requirements 11-21

01 42 19 Reference Standards 11-20

01 45 00 Quality Control 02-21

01 45 29 Testing Laboratory Services 11-18

01 45 35 Special Inspections 06-21

01 57 19 Temporary Environmental Controls 01-21

01 58 16 Temporary Interior Signage 07-15

01 74 19 Construction Waste Management 11-21

01 81 13 Sustainable Construction Requirements 10-17

01 91 00 General Commissioning Requirements 10-15

DIVISION 02 – EXISTING CONDITIONS

02 82 13.13 Glovebag Asbestos Abatement 01-21

02 82 13.31 Asbestos Transite Abatement 01-21

02 83 33.13 Lead-Based Paint Removal and Disposal 01-21

02 84 16 Handling & Disposal of Fluorescent Tubes and Batteries

DIVISION 03 – CONCRETE

03 30 00 Cast-in-Place Concrete 01-21

DIVISION 04 – MASONRY

DIVISION 05 – METALS

05 12 00 Structural Steel Framing 11-18

05 31 00 Steel Decking 01-21

05 50 00 Metal Fabrications 08-18

DIVISION 06 – WOOD, PLASTICS AND COMPOSITES

06 10 00 Rough Carpentry 10-17

06 20 00 Finish Carpentry 01-21

00 01 10-2

DIVISION 07 - THERMAL AND MOISTURE PROTECTION

07 01 50.19 Preparation for Re-Roofing 01-21

07 21 13 Thermal Insulation 01-21

07 22 00 Roof and Deck Insulation 01-21

07 41 13.16 Standing Seam Metal Roof Panels

07 42 13.19 Insulated Metal Wall Panels

07 54 23 Thermoplastic Polyolefin (TPO) Roofing 01-21

07 60 00 Flashing and Sheet Metal 01-21

07 81 00 Applied Fireproofing 10-17

07 81 23 Intumescent Fire Protection

07 84 00 Firestopping 01-21

07 92 00 Joint Sealants 10-17

DIVISION 08 - OPENINGS

08 11 13 Hollow Metal Doors and Frames 01-21

08 14 00 Interior Wood Doors 01-21

08 31 13 Access Doors and Frames 01-21

08 33 00 Coiling Grilles 01-21

08 33 13 Coiling Counter Doors 01-21

08 41 13 Aluminum-Framed Storefronts 01-21

08 41 26 All Glass Entrances and Storefronts

08 71 00 Door Hardware 01-21

08 80 00 Glazing 01-21

08 87 33 Architectural Window Film

DIVISION 09 – FINISHES

09 05 16 Subsurface Preparation for Floor Finishes 01-21

09 06 00 Schedule for Finishes 01-21

09 21 16.23 Gypsum Board Shaft Wall Assemblies

09 22 16 Non-Structural Metal Framing 06-18

09 29 00 Gypsum Board 04-20

09 30 13 Ceramic/Porcelain Tiling 01-21

09 51 00 Acoustical Ceilings 12-18

09 65 13 Resilient Base and Accessories 01-21

09 65 16 Resilient Sheet Flooring 05-18

09 67 23.60 Resinous Urethane and Epoxy Mortar Flooring 01-21

09 91 00 Painting 01-21

09 96 59 Specialty Glazed Coatings 01-21

DIVISION 10 – SPECIALTIES

10 26 00 Wall and Door Protection 01-21

10 28 00 Toilet, Bath, and Laundry Accessories 01-21

10 44 13 Fire Extinguisher Cabinets 08-18

10 51 13 Lockers

00 01 10-3

DIVISION 11 – EQUIPMENT

11 13 19 Stationary Loading Dock Equipment

11 13 23 Portable Dock Equipment

11 41 00 Food Service Equipment 01-21

DIVISION 12 – FURNISHINGS

12 24 00 Window Shades 08-17

12 31 00 Manufactured Metal Casework 01-21

DIVISION 21- FIRE SUPPRESSION

21 13 13 Wet-Pipe Sprinkler Systems 06-15

DIVISION 22 – PLUMBING

22 05 11 Common Work Results for Plumbing 09-20

22 05 19 Meters and Gages for Plumbing Piping 09-20

22 05 23 General-Duty Valves for Plumbing Piping 09-20

22 07 11 Plumbing Insulation 09-19

22 08 00 Commissioning of Plumbing Systems 11-16

22 11 00 Facility Water Distribution 05-21

22 11 23 Domestic Water Pumps 09-15

22 13 00 Facility Sanitary and Vent Piping 09-20

22 13 23 Sanitary Waste Interceptors 09-20

22 14 00 Facility Storm Drainage 09-15

22 35 00 Domestic Water Heat Exchangers 09-20

22 40 00 Plumbing Fixtures 09-15

DIVISION 23 – HEATING, VENTILATING, AND AIR

CONDITIONING (HVAC)

23 05 11 Common Work Results for HVAC 02-20

23 05 12 General Motor Requirements for HVAC and Steam

Generation Equipment

02-20

23 05 41 Noise and Vibration Control for HVAC Piping and

Equipment

02-20

23 05 93 Testing, Adjusting, and Balancing for HVAC 02-20

23 07 11 HVAC and Boiler Plant Insulation 02-20

23 08 00 Commissioning of HVAC Systems 02-20

23 09 23 Direct-Digital Control System for HVAC 09-11

23 11 23 Facility Natural-Gas Piping 04-20

23 21 13 Hydronic Piping 02-20

23 21 23 Hydronic Pumps 02-20 23 22 13 Steam and Condensate Heating Piping 02-20

23 22 23 Steam Condensate Pumps 04-20

23 23 00 Refrigerant Piping 02-20

23 25 00 HVAC Water Treatment 02-20

23 31 00 HVAC Ducts and Casings 02-20

23 34 00 HVAC Fans 02-20

00 01 10-4

SECTION NO. DIVISION AND SECTION TITLES DATE

23 36 00 Air Terminal Units 02-20

23 37 00 Air Outlets and Inlets 02-20

23 38 13 Commercial-Kitchen Hoods 02-20

23 40 00 HVAC Air Cleaning Devices 03-20

23 81 00 Decentralized Unitary HVAC Equipment 03-20

23 81 46 Water-Source Unitary Heat Pumps 03-20

23 82 16 Air Coils 03-20

DIVISION 26 – ELECTRICAL

26 05 11 Requirements for Electrical Installations 01-16

26 05 19 Low-Voltage Electrical Power Conductors and Cables 01-17

26 05 26 Grounding and Bonding for Electrical Systems 01-17

26 05 33 Raceway and Boxes for Electrical Systems 01-18

26 05 73 Overcurrent Protective Device Coordination Study 01-18

26 08 00 Commissioning of Electrical Systems 11-16

26 09 23 Lighting Controls 01-18

26 24 16 Panelboards 01-18

26 27 26 Wiring Devices 01-18

26 29 11 Motor Controllers 01-18

26 29 21 Enclosed Switches and Circuit Breakers 01-17

26 41 00 Facility Lightning Protection 01-17

26 51 00 Interior Lighting 01-18

DIVISION 27 – COMMUNICATIONS

27 05 11 Requirements for Communications Installations 09-19

27 05 26 Grounding and Bonding for Communications Systems 06-15

27 05 33 Raceways and Boxes for Communications Systems 10-18

27 08 00 Commissioning of Communications Systems 11-16

27 10 00 Control, Communication and Signal Wiring 06-15

27 11 00 Communications Equipment Room Fittings 06-15

27 15 00 Communications Structured Cabling 01-16

27 51 16 Public Address and Mass Notification Systems 10-18

DIVISION 28 – ELECTRONIC SAFETY AND SECURITY

28 05 00 Common Work Results for Electronic Safety and Security 04-18

28 05 13 Conductors and Cables for Electronic Safety and

Security

10-18

28 05 26 Grounding and Bonding for Electronic Safety and

Security

09-11

28 05 28.33 Conduits and Backboxes for Electronic Safety and

Security

09-11

28 08 00 Commissioning of Electronic Safety and Security Systems 11-16

28 13 00 Physical Access Control System 10-11

28 23 00 Video Surveillance 09-11

28 26 00 Electronic Personal Protection System 09-11

28 31 00 Fire Detection and Alarm 10-11

00 01 10-5

DIVISION 31 – EARTHWORK

31 20 00 Earthwork 07-16

DIVISION 32 – EXTERIOR IMPROVEMENTS

32 05 23 Cement and Concrete for Exterior Improvements 08-16

32 90 00 Planting 08-16

00 01 10-6

RENOVATE 1ST FLOOR NEW KITCHEN 438-21-403 03-20

23 82 16 - 1

SECTION 23 82 16

AIR COILS

PART 1 - GENERAL

1.1 DESCRIPTION

Heating and cooling coils for air handling unit and duct applications

1.2 RELATED WORK

A. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES

B. Section 01 91 00, GENERAL COMMISSIONING REQUIREMENTS

C. Section 23 05 11, COMMON WORK RESULTS FOR HVAC

D. Section 23 08 00, COMMISSIONING OF HVAC SYSTEMS

E. Section 23 09 23, DDC SYSTEMS for HVAC

F. Section 23 31 00, HVAC DUCTS AND CASINGS

G. Section 23 36 00, AIR TERMINAL UNITS: Reheat coils for VAV/CV terminals.

1.3 QUALITY ASSURANCE

A. Refer to paragraph, QUALITY ASSURANCE, Section 23 05 11, COMMON WORK

RESULTS FOR HVAC.

B. Unless specifically exempted by these specifications, heating and cooling coils shall be tested, rated, and certified in accordance with

AHRI Standard 4l0 and shall bear the AHRI certification label.

1.4 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT

DATA, and SAMPLES.

B. Manufacturer's Literature and Data for Heating and Cooling Coils:

Submit type, size, arrangements and performance details. Present application ratings in the form of tables, charts or curves.

C. Provide installation, operating and maintenance instructions.

D. Certification Compliance: Evidence of listing in current ARI Directory of Certified Applied Air Conditioning Products.

E. Coils may be submitted with Section 23 36 00, AIR TERMINAL UNITS

F. Completed System Readiness Checklists provided by the Commissioning

Agent and completed by the contractor, signed by a qualified technician and dated on the date of completion, in accordance with the requirements of Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS.

1.5 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

23 82 16 - 2

B. Air Conditioning and Refrigeration Institute (AHRI):

Directory of Certified Applied Air Conditioning Products

AHRI 4l0-2001...........Forced-Circulation Air-Cooling and Air-Heating

Coils

C. American Society for Testing and Materials (ASTM):

B75/75M-2019............Standard Specifications for Seamless Copper

Tube

D. National Fire Protection Association (NFPA):

70-2017.................National Electric Code

E. National Electric Manufacturers Association (NEMA):

250-2014................Enclosures for Electrical Equipment (1,000

Volts Maximum)

F. Underwriters Laboratories, Inc. (UL):

1996-2014...............Electric Duct Heaters

PART 2 - PRODUCTS

2.1 HEATING AND COOLING COILS

A. Conform to ASTM B75 and AHRI 410.

B. Surgical Suites – All Locations: All coils installed in the air handling units serving surgical suites, duct-mounted reheat coils, and air terminal unit-mounted reheat coils shall be equipped with copper fins.

C. High Humidity Locations: For air-handling unit mounted coils provide the following corrosion treatment:

1. Epoxy Immersion Coating – Electrically Deposited: The multi-stage corrosion-resistant coating application comprises of cleaning

(heated alkaline immersion bath) and reverse-osmosis immersion rinse prior to the start of the coating process. The coating thickness shall be maintained between 0.6-mil and 1.2-mil. Before the coils are subjected to high-temperature oven cure, they are treated to permeate immersion rinse and spray. Where the coils are subject to

UV exposure, UV protection spray treatment comprising of UV-resistant urethane mastic topcoat shall be applied. Provide complete coating process traceability for each coil and minimum five years of limited warranty.

2. The coating process shall such that uniform coating thickness is maintained at the fin edges. The quality control shall be

23 82 16 - 3 maintained by ensuring compliance to the applicable ASTM Standards for the following:

a. Salt Spray Resistance (Minimum 6,000 Hours)

b. Humidity Resistance (Minimum 1,000 Hours)

c. Water Immersion (Minimum 260 Hours)

d. Cross-Hatch Adhesion (Minimum 4B-5B Rating)

e. Impact Resistance (Up to 160 Inch/Pound)

D. Tubes: Minimum 16 mm (0.625 inch) tube diameter; Seamless copper tubing.

E. Fins: 0.1397 mm (0.0055 inch) aluminum or 0.1143 mm (0.0045 inch) copper mechanically bonded or soldered or helically wound around tubing.

F. Headers: Copper, welded steel or cast iron. Provide seamless copper tubing or resistance welded steel tube for volatile refrigerant coils.

G. "U" Bends, Where Used: Machine die-formed, silver brazed to tube ends.

H. Coil Casing: 1.6 mm (l6 gage) galvanized steel with tube supports at

1200 mm (48 inch) maximum spacing. Construct casing to eliminate air bypass and moisture carry-over. Provide duct connection flanges.

I. Pressures kPa (PSIG):

Pressure Water Coil Steam Coil Refrigerant Coil

Test 2070 (300) 1725 (250) 2070 (300)

Working 1380 (200) 520 (75) 1725 (250)

J. Protection: Unless protected by the coil casing, provide cardboard, plywood, or plastic material at the factory to protect tube and finned surfaces during shipping and construction activities.

K. Vents and Drain: Coils that are not vented or drainable by the piping system shall have capped vent/drain connections extended through coil casing.

L. Steam Distributing Coils: Conform to ASTM B75 and ARI 410. Minimum 9.5 mm (3/8-inch) steam distributing tubing installed concentrically in 25 mm (one-inch) OD condensing coil tubes.

M. Dampers: Interlocking opposed blades to completely isolate coil from air flow when unit is in bypass position; 1.6 mm (l6 gage) steel, coated with factory applied corrosion resistant baked enamel finish. Provide damper linkage and electric operators. Damper operators shall be of same

23 82 16 - 4 manufacturer as controls furnished under Section 23 09 23, DIRECT-DIGITAL

CONTROL SYSTEM FOR HVAC.

2.2 REHEAT COILS, DUCT MOUNTED

The coils shall be continuous circuit booster type for steam or hot water as shown on drawings. Use the same coil material as listed in

Article 2.1.

2.3 WATER COILS, INCLUDING GLYCOL-WATER

A. Use the same coil material as listed in Paragraphs 2.1.

B. Drainable Type (Self Draining, Self Venting); Manufacturer standard:

l. Cooling, all types.

2. Heating or preheat.

3. Runaround energy recovery. ARI certification of capacity adjustment is waived. See Section 23 72 00, AIR-TO-AIR ENERGY RECOVERY

EQUIPMENT.

C. Cleanable Tube Type; manufacturer standard:

l. Well water applications.

2. Waste water applications.

2.4 VOLATILE REFRIGERANT COILS

A. Continuous circuit, straight tubes, dry expansion type equipped with multi-port distribution header, less expansion valve.

B. Minimum 16 mm (5/8-inch) tube diameter.

C. Designed for R22 or other EPA approved refrigerants.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Follow coil manufacturer's instructions for handling, cleaning, installation and piping connections.

B. Comb fins, if damaged. Eliminate air bypass or leakage at coil sections.

3.2 STARTUP AND TESTING

A. The Commissioning Agent will observe startup and contractor testing of selected equipment. Coordinate the startup and contractor testing schedules with the COR and Commissioning Agent. Provide a minimum of 7 days prior notice.

3.3 COMMISSIONING

A. Provide commissioning documentation in accordance with the requirements of Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS and as required by

Section 01 91 00 GENERAL COMMISSIONING REQUIREMENTS for all inspection, 23 82 16 - 5 start up, and contractor testing required above and required by the

System Readiness Checklist provided by the Commissioning Agent.

B. Components provided under this section of the specification will be tested as part of a larger system. Refer to Section 23 08 00 –

COMMISSIONING OF HVAC SYSTEMS and related sections for contractor responsibilities for system commissioning.

3.4 DEMONSTRATION AND TRAINING

A. Provide services of manufacturer’s technical representative for four hours to instruct VA personnel in operation and maintenance of units.

B. Submit training plans and instructor qualifications in accordance with the requirements of Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS.

- - - E N D - - -

23 81 46 - 1

SECTION 23 81 46

WATER-SOURCE UNITARY HEAT PUMPS

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the following configurations of electrically operated “Water-Source Unitary Heat Pumps"

1. Water source unitary heat pumps smaller than 21 KW (6 Tons.

2. Concealed water source heat pumps larger than 21 kW (6 Tons).

3. Vertical stack water source heat pumps.

4. Roof-top and unit ventilator types (Not specified below)

B. Definitions:

1. Coefficient of Performance (COP) - Cooling: The ratio of the rate of the heat removed to the rate of energy input in consistent units, for a complete refrigerating system or some specific portion of that system under designated operating conditions.

2. Coefficient of Performance (COP) - Heating: The ratio of the rate of heat delivered to the rate of energy input is consistent units for a complete heat pump system, including the compressor and, if applicable, auxiliary heat under designated operating conditions.

3. Energy Efficiency Ratio (EER): The ratio of net cooling capacity in

Btu/h to total rate of electricity input in watts under designated operating conditions.

4. Seasonal Energy Efficiency Ratio (SEER): The ratio of net cooling capacity in Btu/h to total rate of electricity input in watts over a typical cooling season.

5. Heating Season Performance Factor (HSPF): The ratio of the net heating capacity in Btu/h to total rate of electricity input in watts over a typical heating season.

6. Energy-Star Ratings: Energy-Star is a government-backed labeling program that helps people and organizations save money and reduce greenhouse gas emissions by identifying factories, office equipment, home appliances and electronics that have superior energy efficiency.

7. Unitary Water-Cooled Heat Pump: One or more factory made assemblies that normally include an indoor conditioning coil, compressor(s) and an outdoor refrigerant-to-water heat exchanger. These units provide both heating and cooling functions.

8. FEMP: Federal Energy Management Program

23 81 46 - 2

9. Extended Range Heat Pumps (Ground-Source/Ground-Coupled): Heat pumps designed to use with extended operating range of entering water temperature from -1 C (30 F) to 49 C (120 F)

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS.

B. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES.

C. Section 01 91 00 – GENERAL COMMISSIONING REQUIREMENTS

E. Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

F. Section 23 05 12, GENERAL MOTOR REQUIREMENTS FOR HVAC AND STEAM

GENERATION EQUIPMENT.

G. Section 23 05 93, TESTING, ADJUSTING, and BALANCING FOR HVAC.

H. Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS.

I. Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC.

J. Section 23 21 13, HYDRONIC PIPING.

K. Section 23 22 13, STEAM AND CONDENSATE HEATING PIPING

L. Section 23 31 00, HVAC DUCTS and CASINGS.

1.3 QUALITY ASSURANCE:

A. Refer to specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

B. Comply with ASHRAE Standard 15, Safety Code for Mechanical

Refrigeration.

C. Comply with ASHRAE 90.1.

1.4 SUBMITTALS

A. Submit in accordance with specification Section 01 33 23, SHOP

DRAWINGS, PRODUCT DATA, and SAMPLES.

B. Manufacturer’s Literature and Data.

1. Water Source Unitary Heat Pumps:

a. Less than 21 KW (6 Tons)

b. Larger than 21 KW (6 Tons) - Concealed

c. Vertical stack

C. Certification: Submit, simultaneously with shop drawings, a proof of certification that this product has been certified by AHRI.

D. Performance Rating: Submit catalog selection data showing equipment ratings and compliance with required cooling and heating capacities EER and COP values as applicable.

E. Completed System Readiness Checklists provided by the Commissioning

Agent and completed by the contractor, signed by a qualified technician and dated on the date of completion, in accordance with the requirements of Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS.

23 81 46 - 3

1.5 APPLICABLE PUBLICATIONS:

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

B. Federal Specification (Fed. Spec.):

A-A-50502-1990..........Air-conditioner (UNITARY HEAT PUMP), AIR TO AIR

(3000 TO 300,000 BTUH)

C. Air-Conditioning, Heating and Refrigeration Institute (AHRI) Standards:

DCPP 2008...............Directory of Certified Product Performance -

Applied Directory of Certified Products

210/240-2017............Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment

270-2008................Sound Rating of Outdoor Unitary Equipment

310/380-2017............Standard for Packaged Terminal Air-Conditioners and Heat Pumps (CSA-C744-04)

320-2017................Water-Source Heat Pumps

325-2017................Ground Water-Source Heat Pumps

330-2015................Ground Source Closed-Loop Heat Pumps

340/360-2015............Commercial and Industrial Unitary Air-

Conditioning and Heat Pump Equipment

D. Air Movement and Control Association (AMCA):

210-2016................Laboratory Methods of Testing Fans for

Aerodynamic Performance Rating (ANSI)

410-1996................Recommended Safety Practices for Users and

Installers of Industrial and Commercial Fans

E. American National Standards Institute (ANSI):

S12.51-2017.............Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Pressure -

Precision Method for Reverberation Rooms (same as ISO 3741:1999)

F. American Society of Heating, Refrigerating and Air-Conditioning

Engineers Inc (ASHRAE):

15-2019.................Safety Standard for Refrigeration Systems

(ANSI)

62.1-2016...............Ventilation for Acceptable Indoor Air Quality

(ANSI)

23 81 46 - 4

90.1-2016...............Energy Standard for Buildings except Low-Rise

Residential Buildings

Handbook 2016 HVAC Systems and Equipment

G. American Society of Testing and Materials (ASTM):

B117-2017...............Standard Practice for Operating Salt Spray

(Fog) Apparatus

H. National Electrical Manufacturer’s Association (NEMA):

MG 1-2019...............Motors and Generators (ANSI)

ICS 1-2005..............Industrial Controls and Systems: General

Requirements

I. National Fire Protection Association (NFPA):

90A-2018................Standard for the Installation of Air-

Conditioning and Ventilating Systems

J. Underwriters Laboratory (UL):

1995-2015...............Heating and Cooling Equipment

PART 2- PRODUCTS

2.1 GENERAL REQUIREMENTS FOR WATER SOURCE HEAT PUMPS

A. System Characteristics of a Closed-Loop System: The system consists of multiple units connected to a 2-pipe, closed-loop hydronic system with continuous water circulation. The temperature of the water loop shall be maintained at approximately 18-35 degrees C (65-95 degrees F) by means of addition of heat and heat rejection when needed.

B. System Characteristics of a Ground Source Closed-Loop System: The system consists of multiple units connected to a 2-pipe, closed-loop hydronic system with continuous water circulation. The temperature of the water loop shall be maintained between approximately -1 and 49 degrees C (30-120 degrees F) by means of heat addition or heat rejection into the ground loop.

C. System Characteristics of a Ground Source Open-Loop System: The system consists of multiple units connected to a 2-pipe, open-loop hydronic system with continuous water circulation. The temperature of the water loop shall be operating over an extended range, -1 and 49 degrees C

(30-120 degrees F), by means of heat addition or heat rejection directly into the ground water.

D. Applicable AHRI Standards: Units shall be listed in the corresponding

AHRI Directory of certified Products shown in Article APPLICABLE

PUBLICATIONS.

23 81 46 - 5

E. The water-source heat pumps are available in different configurations, such as, console type, horizontal or vertical stacked type), roof-top, and unit ventilator type. Refer to SPEC WRITER NOTE:3 above to edit and make changes as required.

F. Corrosion Protection:

1. Remote Outdoor Condenser Coils:

Epoxy Immersion Coating – Electrically Deposited: The multi-stage corrosion-resistant coating application comprises of cleaning

(heated alkaline immersion bath) and reverse-osmosis immersion rinse prior to the start of the coating process. The coating thickness shall be maintained between 0.6-mil and 1.2-mil. Before the coils are subjected to high-temperature oven cure, they are treated to permeate immersion rinse and spray. Where the coils are subject to

UV exposure, UV protection spray treatment comprising of UV-resistant urethane mastic topcoat shall be applied. Provide complete coating process traceability for each coil and minimum five years of limited warranty. The coating process shall be such that uniform coating thickness is maintained at the fin edges. The quality control shall be maintained by ensuring compliance to the applicable ASTM Standards for the following:

a. Salt Spray Resistance (Minimum 6,000 Hours)

b. Humidity Resistance (Minimum 1,000 Hours)

c. Water Immersion (Minimum 260 Hours)

d. Cross-Hatch Adhesion (Minimum 4B-5B Rating)

e. Impact Resistance (Up to 160 Inch/Pound)

2. Exposed Outdoor Cabinet: Casing Surfaces (Exterior and Interior):

All exposed and accessible metal surfaces shall be protected with a water-reducible acrylic with stainless steel pigment spray-applied over the manufacturer’s standard finish. The spray coating thickness shall be 2-4 mils and provide minimum salt-spray resistance of 1,000 hours (ASTM B117) AND 500 hours UV resistance

(ASTM D4587)

2.2 WATER SOURCE UNITARY HEAT PUMP (WSHP) LESS THAN 21 KW (6 TONS)

A. Description: Packaged water-source heat pump with temperature controls;

and shall be factory assembled, tested, and rated according to AHRI-

ISO-13256-1. Unit shall be horizontal type, with inlet and outlet duct connections. Comply with AHRI 320.

23 81 46 - 6

B. Cabinet: Manufacturer’s standard galvanized steel for ducted models and galvanized steel with baked enamel finish for console models. Units shall have access panels, and ducted models shall have flanged duct connections. Cabinet shall be factory insulated with fiber glass duct liner, minimum 13 mm (1/2-inch) thick and complying with UL 181. Units shall have knockouts for electrical, piping, and condensate drain connections.

C. Fan:

1. Housed Centrifugal Fan Direct driven, centrifugal, with permanently lubricated multi-speed motor resiliently mounted in fan inlet

2. Plenum Fan(s) Direct-driven, aluminum wheel, plenum fans mounted in

Arrangement 4, and equipped with variable speed drives. Maximum number of fans in a single array shall not exceed four.

D. Compressor: Hermetic, scroll compressor installed on vibration isolators; with a slide-out chassis and housed in an acoustically treated enclosure. Unit shall have factory-installed safeties, anti-recycle timer, high-pressure cutout, low-pressure cutout or loss-of-charge switch, internal thermal-overload protection, and freeze stat to stop compressor if water-loop temperature in refrigerant-to-water heat exchanger falls below 2 deg C (35 deg F). Condensate overflow switch shall stop compressor with high condensate level in condensate drain pan. Compressor lockout circuit shall be capable of being reset at either remote thermostat or circuit breaker.

E. Refrigerant Piping Materials: ASTM B 743 copper tube with wrought-copper fittings and brazed joints.

F. Pipe Insulation: Refrigerant minimum 10-mm (3/8-inch) thick, flexible elastomeric insulation on piping exposed to airflow through the unit.

Maximum 25/50 flame-spread/smoke-development indexes according to

ASTM E 84.

G. Refrigerant Metering Device: Thermal expansion valve to allow specified operation with entering-water temperatures from 18 to 38 deg C (65 to

100 deg F). Capillary tubes may be used only when unit is furnished with water-regulating valve.

I. Condensate Drainage: Plastic or stainless-steel drain pan with condensate drain piping projecting through unit cabinet and complying with ASHRAE 62.1.

J. Airstream Surfaces: Surfaces in contact with the airstream shall comply with requirements in ASHRAE 62.1.

23 81 46 - 7

L. General Motor Requirements: Comply with requirements in Section

23 05 12, GENERAL MOTOR REQUIREMENTS FOR HVAC AND STEAM GENERATOR

EQUIPMENT. Motor shall be multispeed, permanently lubricated, permanent split capacitor ECM.

M. Water-to-Refrigerant Heat Exchanger:

1. Coaxial heat exchangers with copper water tube with enhanced heat-transfer surfaces inside a steel shell; both shell and tube shall be leak tested to 3102 kPa (450 psig) on refrigerant side and 2758 kPa

(400 psig) on water side. Heat exchanger shall be factory mounted in unit on resilient rubber vibration isolators.

2. Stainless-Steel, Brazed-Plate Heat Exchanger: Factory mount heat exchanger in unit on resilient rubber vibration isolators and leak tested to 3102 kPa (450 psig) for refrigerant side and 2758 kPa (400 psig) for water side.

N. Water-Side Economizer: Copper tube and aluminum fin coil with three-way valve and entering-water temperature sensor and controller. Valve diverts water to water-side economizer coil ahead of refrigerant-to-water heat exchanger when entering-water temperature falls to 13 deg C

(55 deg F).

O. Water Regulating Valves: Limit water flow through refrigerant-to-water heat exchanger, and control head pressure on compressor during cooling and heating. Valves shall close when heat-pump compressor is not running.

P. Motorized Water Valve: Stop water flow through the unit when compressor is off.

Q. Refrigerant-to-Air Coils: Copper tubes with aluminum fins, leak tested to 3102 kPa (450 psig).

R. Refrigerant Circuit Components: Sealed refrigerant circuit charged with

R-407C or R-410A refrigerant

1. Filter-Dryer: Factory installed to clean and dehydrate the refrigerant circuit.

2. Charging Connections: Service fittings on suction and liquid for charging and testing.

3. Reversing Valve: Pilot-operated sliding-type valve designed to be fail-safe in heating position with replaceable magnetic coil.

4. Refrigerant Metering: Extended temperature range device or a bi-directional thermal expansion valve.

23 81 46 - 8

U. Hot-Gas Bypass: Include constant pressure expansion valve, solenoid valve, and controls to maintain continuous refrigeration system operation at 10 percent of full load on lead compressor.

V. Filters: Disposable, pleated type, 25 mm (1 inch) thick and with a minimum of 90 percent arrestance according to ASHRAE 52.1 and a MERV rating of 7 according to ASHRAE 52.2.

W. Comply with requirements in Section 23 09 23, DIRECT-DIGITAL CONTROL

SYSTEM FOR HVAC for control equipment and sequence of operation.

X. Controls:

1. Basic Unit Controls:

a. Low- and high-voltage protection.

b. Overcurrent protection for compressor and fan motor.

c. Random time delay, three to ten seconds, start on power up.

d. Time delay override for servicing.

e. Control voltage transformer.

2. Thermostat: Wall-mounted thermostat heat-cool-off switch, fan on-auto switch, automatic, exposed, temperature set point, Deg F indication.

3. Terminal Controller:

a. Scheduled operation for occupied and unoccupied periods on 365-day clock with minimum 4 programmable periods per day, two-hour unoccupied period override period Remote control panel to contain programmable timer and LED for fault condition.

b. Compressor-disable relay shall stop compressor operation for demand limiting or switch to unoccupied operation.

c. Unit shall automatic restart after five minutes if fault clears and lockout after three attempts to restart following fault.

d. Indicate fault for service technician Return-air temperature high-limit (firestat).

e. Stop unit on high temperature.

f. Backup for volatile memory.

g. Differential pressure switch shall indicate fan status.

h. Fan failure alarm.

i. Differential pressure switch shall indicate filter status.

j. Dirty filter alarm.

4. Comply with requirements in Section 23 09 23, DIRECT-DIGITAL CONTROL

SYSTEM FOR HVAC for BAS interface requirements. Interface relay for scheduled operation. Interface relay shall provide indication of

23 81 46 - 9 fault at central workstation. Interface shall be BAC-net for central

BAS workstation for the following functions. Set-point adjustment for set points identified in this Section start/stop and operating status of heat-pump unit Data inquiry shall include supply air, room air temperature and humidity, and entering-water temperature.

Occupied and unoccupied schedules

Y. Electrical Connection: Control box with single electrical connection factory installed and tested with fused disconnect.

Z. Hangers shall have manufacturer's recommended vibration isolators for horizontal type heat pumps.

PART 3- EXECUTION

A. Floor-Mounted Units: Support on neoprene pads with minimum 3.17-mm

(0.125-inch) static deflection. Secure units to anchor bolts installed in concrete bases.

B. Suspended Units: Suspend from structure with threaded steel rods and minimum 6.35-mm (0.25-inch) static deflection rubber-in-shear vibration isolators.

C. Install wall-mounting thermostats, humidistats, and switch controls in electrical outlet boxes at heights to match lighting controls or as required in Section 23 91 00, GENERAL COMMISSIONING REQUIREMENTS and

Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC.

3.2 CONNECTIONS

A. Connect supply and return hydronic piping to heat pump with unions and shutoff valves.

B. Connect heat-pump condensate drain pan to indirect waste connection with condensate trap of adequate depth to seal against the pressure of fan. Install cleanouts in piping at changes of direction.

C. Connect supply- and return-air ducts to water-source heat pumps with flexible duct connectors. Comply with requirements in Section 23 31 00, HVAC DUCTS and CASINGS.

D. Install electrical devices furnished by manufacturer but not specified to be factory mounted.

E. Install piping adjacent to machine to allow service and maintenance.

23 81 46 - 10

3.4 FIELD QUALITY CONTROL

A. Perform the following field tests and inspections and prepare test reports:

1. Test the heat pump units for the performance compliance after the installation is complete and electrical circuitry is energized.

2. Inspect for and remove shipping bolts, blocks, and tie-down straps.

3. Operational Test: After electrical circuitry has been energized, start units to confirm motor rotation and unit operation.

4. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

B. Remove and replace malfunctioning units and retest as specified above.

3.5 INSTRUCTIONS

A. Provide services of manufacturer’s technical representative for four hours to instruct VA personnel in operation and maintenance of heat pumps.

3.6 STARTUP AND TESTING

A. The Commissioning Agent will observe startup and contractor testing of selected equipment. Coordinate the startup and contractor testing schedules with the Resident Engineer and Commissioning Agent. Provide a minimum of 7 days prior notice.

3.7 COMMISSIONING

A. Provide commissioning documentation in accordance with the requirements of Section 01 91 00 – GENERAL COMMISSIONING REQUIREMENTS and Section 23

08 00 – COMMISSIONING OF HVAC SYSTEMS for all inspection, start up, and contractor testing required above and required by the System Readiness

Checklist provided by the Commissioning Agent.

B. Components provided under this section of the specification will be tested as part of a larger system. Refer to Section 23 08 00 –

COMMISSIONING OF HVAC SYSTEMS and related sections for contractor responsibilities for system commissioning.

3.8 DEMONSTRATION AND TRAINING

A. Provide services of manufacturer’s technical representative for four hours to instruct VA personnel in operation and maintenance of units.

238100-1

SECTION 23 81 00

DECENTRALIZED UNITARY HVAC EQUIPMENT

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies rooftop make-up air unit.

B. Definitions:

1. Energy Efficiency Ratio (EER): The ratio of net cooling capacity is

Btu/h to total rate of electricity input in watts under designated operating conditions (Btu hour/Watt).

2. Seasonal Energy Efficiency Ratio (EER): The ratio of the total cooling output of an air conditioner during its normal annual usage period for cooling in Btu/h divided by total electric energy input in watts during the same period (Btu hour/Watt).

3. Unitary: A Unitary Air Conditioner consists of one or more factory-made assemblies which normally include an evaporator or cooling coil, a compressor and condenser combination, and may include a heating function as well.

4. Where such equipment is provided in more than one assembly the separated assemblies are to be designed to be used together and the requirements of rating are based upon use of matched assemblies.

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS.

B. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES

E. Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

F. Section 23 05 12, GENERAL MOTOR REQUIREMENTS FOR HVAC and STEAM

GENERATION EQUIPMENT

G. Section 23 05 41, NOISE and VIBRATION CONTROL FOR HVAC PIPING and

EQUIPMENT.

H. Section 23 05 93, TESTING, ADJUSTING, and BALANCING FOR HVAC.

I. Section 23 07 11, HVAC and BOILER PLANT INSULATION.

J. Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS.

K. Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC.

N. Section 23 31 00, HVAC DUCTS and CASINGS.

O. Section 23 36 00, AIR TERMINAL UNITS.

P. Section 23 82 16, AIR COILS

Q. Section 28 31 00, FIRE DETECTION and ALARM.

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1.3 QUALITY ASSURANCE

A. Refer to specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

B. Safety Standards: ASHRAE Standard 15, Safety Code for Mechanical

Refrigeration.

1.4 SUBMITTALS

A. Submit in accordance with specification Section 01 33 23, SHOP

DRAWINGS, PRODUCT DATA, and SAMPLES

B. Manufacturer’s literature and data:

1. Sufficient information, including capacities, pressure drops, and piping connections clearly presented, shall be included to determine compliance with drawings and specifications for units noted below:

a. Unitary air conditioners:

1) Split systems

2) Rooftop units

2. Unit Dimensions required clearances, operating weights accessories and start-up instructions.

3. Electrical requirements, wiring diagrams, interlocking and control wiring showing factory installed and portions to be field installed.

4. Mounting and flashing of the roof curb to the roofing structure with coordinating requirements for the roof membrane system.

C. Certification: Submit proof of specified ARI Certification.

D. Performance Rating: Submit catalog selection data showing equipment ratings and compliance with required sensible-to-heat-ratio, energy efficiency ratio (EER), and coefficient of performance (COP).

E. Operating and Maintenance Manual: Submit three copies of Operating and

Maintenance manual to Resident Engineer three weeks prior to final inspection.

F. Completed System Readiness Checklists provided by the Commissioning

Agent and completed by the contractor, signed by a qualified technician and dated on the date of completion, in accordance with the requirements of Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS.

1.5 APPLICABLE PUBLICATIONS

extent referenced. The publications are referenced in the text by the basic designation only.

B. Air-Conditioning, Heating, and Refrigeration Institute (AHRI):

238100-3

210/240-2017............Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment

270-2015................Sound Rating of Outdoor Unitary Equipment

310/380-2017............Standard for Packaged Terminal Air-Conditioners and Heat Pumps (CSA-C744-04)

340/360-2015............Performance Rating of Commercial and Industrial

Unitary Air-Conditioning and Heat Pump

Equipment

520-2004................Performance Rating of Positive Displacement

Condensing Units

C. Air Movement and Control Association (AMCA):

210-2016................Laboratory Methods of Testing Fans for

Aerodynamic Performance Rating (ANSI)

410-1996................Recommended Safety Practices for Users and

Installers of Industrial and Commercial Fans

D. American National Standards Institute (ANSI):

S12.51-2017.............Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Pressure -

Precision Method for Reverberation Rooms (same as ISO 3741:1999)

E. American Society of Civil Engineers (ASCE)

ASCE 7-2017.............Minimum Design Loads for Buildings and Other

Structures

F. American Society of Heating, Refrigerating, and Air-Conditioning

Engineers (ASHRAE):

Handbook 2016...........HVAC Systems and Equipment

15-2019.................Safety Standard for Refrigeration Systems

(ANSI)

62.1-2016...............Ventilation for Acceptable Indoor Air Quality

(ANSI)

G. American Society of Testing and Materials (ASTM):

B117-2018...............Standard Practice for Operating Salt Spray

(Fog) Apparatus

H. Federal Specifications (Fed. Spec.):

A-A-50502-2009.......... Air conditioner (Unitary Heat Pump) Air to Air

(3000-300,000 Btu)

I. Military Specifications (Mil. Specs.):

MIL-PRF-26915D-.........Primer Coating, for Steel Surfaces

238100-4

J. National Electrical Manufacturer's Association (NEMA):

ICS 1-2005..............Industrial Controls and Systems: General

Requirements

MG 1-2019...............Motors and Generators (ANSI)

K. National Fire Protection Association (NFPA) Publications:

90A-2018................Standard for the Installation of Air-

Conditioning and Ventilating Systems

PART 2 - PRODUCTS

2.1 UNITARY AIR CONDITIONERS - GENERAL

A. Applicable ARI Standards:

1. Cooling Capacity 39.6 kW (135,000 Btu/h) and More: AHRI 340/ 360.

2. Cooling Capacity Less Than 39.6 kW (135,000 Btu/h): AHRI 210/240.

Units shall be listed in the ARI Directory of Certified Unitary Air-

Conditioners.

B. Performance Rating: Cooling capacity of units shall meet the sensible heat and total heat requirements shown in the contract documents. In selecting unit size, make true allowance for "sensible to total heat ratio" to satisfy required sensible cooling capacity.

C. Machinery Guards: Provide guards as shown in AMCA 410 for belts, chains, couplings, pulleys, sheaves, shafts, gears and other moving parts regardless of height above the floor. Drive guards may be excluded where motors and drives are inside factory fabricated casings.

D. Corrosion Prevention: Unless specified otherwise, equipment fabricated from ferrous metals that do not have a zinc coating or a duplex coating of zinc and paint shall be treated for prevention of rust with a factory coating or paint system that will withstand 125 hours in a salt-spray fog test, except that equipment located outdoors shall be tested for 500 hours. The salt-spray fog test shall be in accordance with ASTM B117 using a 20 percent sodium chloride solution. Immediately after completion of the test, the coating shall show no signs of blistering, wrinkling or cracking, no loss of adhesion, and the specimen shall show no signs of rust beyond 3 mm (1/8-inch) on both sides from the scratch mark.

2.2 SELF-CONTAINED AIR CONDITIONERS

A. Description: Factory assembled and wired consisting of the following:

1. Cabinet.

2. Compressor.

3. Evaporator fan.

238100-5

4. Evaporator coil,

5. Integral air-cooled condenser.

6. Glycol/Hot-water heating coil.

7. Air filters.

8. Controls.

9. Full charge of refrigerant and oil.

B. Cabinet Frame and Panels: Structural-steel frame with galvanized-steel panels with baked-enamel finish in color selected by Architect, and with access doors or panels.

1. Insulation: Minimum 25-mm (1-inch) thick, aluminum foil faced glass fiber duct liner on cabinet interior and control panel.

2. Drain Pan: Stainless steel insulated complying with ASHRAE 62.1-

2007.

3. Isolation: Spring isolators for mounting under base of unit, with minimum static deflection of 25 mm (1 inch).

4. Discharge Plenum: Cabinet extension with directional louvers.

Cabinet extension with duct openings for supply air and lined with a minimum of 50-mm (2-inch) thick duct liner.

5. Corrosion-Resistant Treatment: Phenolic coating on unit interior and exterior.

6. Airstream Surfaces: Surfaces in contact with the airstream shall comply with requirements in ASHRAE 62.1.

C. Evaporator Fan: Galvanized steel, double-width, double-inlet, airfoil centrifugal fan; statically and dynamically balanced. Direct drive, with fan mounted on permanently lubricated bearings and having cast-iron or steel sheaves, dynamically balanced, bored to fit shafts and keyed. Motor sheaves shall be variable and adjustable pitch selected so required rpm are obtained when set at middle position. Fan and motor shall be resiliently mounted with ratings as recommended by the manufacturer with a minimum of one and one-half times nameplate rating of motor. Bearings shall be grease lubricated with grease lines extended to exterior of unit. Variable-air volume units shall have variable frequency drives with adjustable, static-pressure controller responding to a static-pressure sensor and variable-frequency motor controller.

D. Fan Motors: Comply with requirements in Section 23 05 12, GENERAL MOTOR

REQUIREMENTS FOR HVAC and STEAM GENERATION EQUIPMENT and shall be open drip-proof totally enclosed fan cooled, premium efficiency.

238100-6

E. Isolation: Mount fan and motor on common sub-base and mount assembly on spring isolators with minimum static deflection of 25 mm (1 inch) unless otherwise indicated.

F. Compressor hermetically sealed, scroll, 3600 rpm maximum, and resiliently mounted with positive lubrication and internal motor protection.

G. Evaporator Coil: Direct-Expansion Coil: Seamless copper tubes expanded into aluminum fins with interlaced circuiting:

H. Refrigerant Circuits: A separate circuit for each compressor, with externally equalized thermal-expansion valve, filter-dryer, sight glass, high-pressure relief valve, and charging valves.

J. Remote Air-Cooled Condenser: Factory assembled and tested; consisting of condenser coil, fans and motors, and operating controls; and suitable for roof mounting.

1. Condenser Coil: Aluminum-fin copper tube with integral subcooler;

leak tested to 3110 kPa (450 psig).

2. Condenser Fans: Direct-drive propeller type.

3. Fan Motors: Three-phase, permanently lubricated, ball-bearing motors with built-in thermal-overload protection. Comply with requirements in Section 23 05 12, GENERAL MOTOR REQUIREMENTS FOR HVAC and STEAM

GENERATION EQUIPMENT.

4. Furnish low ambient controls to allow stable operation down to minus

18 degrees C (0 degrees F).

K. Refrigerant Line Kits: Annealed-copper suction and liquid lines that are factory cleaned, dried, pressurized, and sealed; insulated suction line; flared fittings at evaporator end, no fitting at condenser end;

and service valves for both suction and liquid lines.

L. Integral Air-Cooled Condenser for Units 52.8 kW (15 tons) and Smaller.

Factory assembled and tested; consisting of condenser coil, fans and motors, and cabinet:

1. Condenser Coil: Aluminum-fin copper tube with integral sub cooler;

leak tested to 2930 kPa (425 psig).

2. Condenser Fans: Direct-drive propeller type with permanently lubricated motor with built-in thermal-overload protection.

3. Low Ambient Control: Cycles fans to permit operation down to minus

18 deg C (0 deg F).

M. Refrigeration System: Factory assembled and tested, and charged with refrigerant; and consisting of piping and accessories connecting

238100-7 compressor, evaporator coil, and condenser coil, and including the following:

1. For heat pump units, a four-way reversing valve and suction-line accumulator.

2. Expansion valve with replaceable thermostatic element.

3. Refrigerant dryer.

4. High-pressure switch.

5. Low-pressure switch.

6. Thermostat for coil freeze-up protection during low-ambient temperature operation or loss of air.

7. Low-ambient switch.

8. Brass service valves installed in discharge and liquid lines.

9. R-407C or R-410A refrigerant unless otherwise indicated.

N. Terminate suction and liquid refrigerant piping with service valves within unit.

O. Low Ambient Control: Cycle fans to permit operation down to 7 deg C (45 deg F). For units larger than 52.8 kW (15 tons), cycle fans and modulate condenser fan damper assembly to permit operation down to minus 18 deg C (0 deg F).

P. Coil Guard: Painted galvanized steel with louvered grilles.

Q. Corrosion-Resistant Treatment: Phenolic coating applied in multiple dips and baked. See paragraph 2.1.D above.

R. Heating Coil:

1. Water/Glycol Coil: Copper tube, with mechanically bonded aluminum fins spaced no closer than 10 fins per 25 mm (1 inch); leak tested to 2070 kPa (300 psig) underwater; and having a modulating control valve.

S. Air Filters:

1. Disposable Filters: 50 mm (2 inch) thick, glass-fiber, pleated MERV

7 panel filters.

2. Extended-Surface, Disposable Panel Filters: 50 mm (2 inch) thick, MERV 8, dry, filters with fibrous media material formed into deep-V-shaped pleats and held by self-supporting wire grid holding frames, with nonflammable cardboard media and media-grid frame.

3. Filter Efficiency: MERV rating as specified above according to

ASHRAE 52.2.

4. Air-Pressure Switch: Indicates dirty filters.

T. Controls:

238100-8

1. Control Package: Factory wired, including contactor, high- and low-pressure cutouts, internal-winding thermostat for compressor, control-circuit transformer, and noncycling reset relay.

2. Time-Delay Relay: Five-minute delay to prevent compressor cycling.

3. Adjustable Thermostat: Unit mounted to control the supply fan, compressor, condenser; and hot-water or steam coil valveor electric-resistance heating coil.

5. Fan Control Switch: Auto-on.

6. Time Clock: Cycle unit on and off.

7. Microprocessor Control Panel: Control unit functions, including refrigeration and safety controls, supply-fan motor speed, compressors, air-cooled condenser, cooling tower pump, modulating hot-water coil valve, modulating, steam coil valve and multi-step, electric-resistant heating coil. Time-of-day control shall cycle unit on and off Night-heat and morning warm-up cycle.

8. DDC Interface: Controls shall interface with the BMS system. Provide open protocol BACnet interface.

9. Panel-mounted control switch shall operate unit in remote or local control mode, or to stop or reset.

10. Panel-mounted indication of the operating status system diagnostics and safety alarms, supply-air temperature set point, zone heating-temperature set point, supply-air pressure set point, economizer minimum position set point, supply-air pressure, and high-limit set point. Time-of-day control shall cycle unit on and off and night-heat and morning warm-up cycle.

PART 3 EXECUTION

A. Roof Curb: Install on roof structure or concrete base, level and secure, according to NRCA's "Low-Slope Membrane Roofing Construction

Details Manual," Illustration "Raised Curb Detail for Rooftop Air

Handling Units and Ducts." ARI Guideline B. Install RTUs on curbs and coordinate roof penetrations and flashing with roof construction specified in Section 07 72 00, ROOF ACCESSORIES. Secure RTUs to upper curb rail, and secure curb base to roof framing or concrete base with anchor bolts.

238100-9

B. Rooftop Unit Support: Install unit level on structural curbs.

Coordinate wall penetrations and flashing with wall construction.

Secure rooftop units to structural…