University Facilities

Division 23 - Heating, Ventilating and Air Conditioning

23 00 00 General Information


Provide a design for a complete HVAC system with specifications and drawings that show floor plans, all associated mechanical piping and equipment, automatic temperature control system, equipment layout, and any necessary details. The designer should address the importance of providing adequate space in all equipment rooms. Consult with the Project Manager for specific clearances required for this design. The steam piping system should meet ASME and ANSI B31 Pressure Piping Code, and include a steam flow metering system with integrator. The CHW system should show primary and secondary diagram, primary crossover bridge. The HVAC system should also plan for installation of energy management. Consult Project Manager for specific requirements to regarding energy management as relates to your project.

Consult the Manual for Planning and Execution of State Permanent Improvements for information concerning requirements, codes, and standards that are applicable to this design. The design shall comply with all local codes having jurisdiction, OSHA regulations, ADA compliance, and any applicable seismic codes.

The designer should pay particular attention to the coordination of installations under this division with those installations specified under Divisions 22, 26, and 33, including the provision for power to be supplied to any equipment by specification under Division 26.

The designer should require submittal and product data on all equipment and products necessary to insure compliance with the contract documents and for inclusion in required maintenance manuals.

The documents should require the testing and balancing of any appropriate mechanical system by an independent testing firm. Adequate copies of this balance report should be required and contain data considered necessary to properly document the results of this balancing. These reports should be included in the final maintenance manual.

Specify that the contractor shall obtain and pay for all installation permits, certificates, and inspection fees relative to the work. The preparation of any specific plans or shop drawings necessary to obtain these permits shall also be the responsibility of the contractor.

The design should not include any pressure piping beneath the building slab. Utilities should enter the building through a utility trench or areaway.

The designer should assure that any differences in required guarantees or warranties from those specified in the General Conditions are clearly noted and explained.

The documents should specify that motor starters, controls, relays, contactors, and switches shall be provided under this division but installed under Division 26, except where they are specified under Division 26 or they are not part of any mechanical piece of equipment. Temperature and low voltage controls should be installed under this division. Power wiring should be furnished and installed under Division 26.

Clearly specify that the products to be provided for installation under this Division are in strict accordance with the Product and Material listing for this Division.

23 05 00 Common Work Results for Heating, Ventilating, and Air Conditioning

23 05 19 Meters and Gauges for HVAC Piping

Pressure gauges shall have maximum readings approximately two times the expected working pressure. A gauge cock should be specified between each gauge and the main line.

Both steam meters and chilled water meters shall be specified to provide connectivity to campuys Johnson Control Metasys.

23 05 23 Valves

Specify that valves be installed with stems horizontal or above except as required for accessibility. Arrange valve handles to be easily accessible.

All valves shall be identified with metal tags.

Specify that valves be installed at all locations requiring shut off during maintenance.

23 05 29 Hangers and Supports for HVAC Piping and Equipment

The design shall provide foundations, supports, and means of attachment to the structure for all equipment, fixtures, and piping under this Division.

Specify the use of the appropriate beam clamps, brackets, and expansion shields for supporting and securing equipment, fixtures, and piping.

Specify wall clamps and brackets used for support of piping and equipment from concrete or solid masonry shall be secured with self-drilling concrete fasteners. Clamps and brackets on hollow masonry block construction shall be supported with toggle bolts.

Specify that horizontal, parallel, and adjacent piping shall be supported by gang hangers with appropriately sized hanger rods (3/8” minimum) and clamps to match the pipe.

Specify that hangers supporting insulated piping be sized to fit over the insulation.

Specify that supports and clamps in contact with copper pipe shall be copper plated.

23 05 53 Identification for HVAC Piping and Equipment

Specify that all piping is to be marked and coded with color coded tape as referenced, in a neat and uniform manner. Markings shall not exceed 20 feet apart in mechanical rooms. The wording and color coding shall be coordinated with other plumbing, electrical, and other trades and suppliers.

The wording on identification markers shall be descriptive of the item identified, as “H.W. Return”, not “Pump 28.”

23 05 93 Testing, Adjusting, and Balancing for HVAC

The documents should specify any necessary tests that are to be conducted on any equipment or systems as appropriate for each specialty of the mechanical system. The documents should require that all tests are to be made in the presence of the A/E or his designated representative, and that accurate records be kept of test readings and that the test results of any significant data be incorporated in the maintenance manuals. The documents should also specify that the contractor is to furnish all labor and technical personnel, instruments, and appliances for these tests. If the gauges, thermometers, etc., that are used for these tests are to be left permanently installed, then they are not to be installed until just prior to the tests so that possible changes in calibration can be avoided. The documents should also specify that any action necessary to protect components of the systems being tested from damage during these tests, i.e., pumps, seals, etc. These tests should include, but are not limited to, the following:

Clemson University will contract directly with a Testing and Balancing contractor to perform all tests and adjustments to the mechanical systems in accordance with the design. Consult with the Project Manager to determine the TAB contractor to be used on the project. Specify that the HVAC contractor shall coordinate and cooperate with the TAB contractor to ensure that the testing and balancing work can be accomplished in an appropriate and timely manner. The consultant should coordinate their design with the TAB contractor in order that the installation of effected equipment (fittings, connecting devices, etc.) will insure an efficient method of accomplishing the testing and balancing.

23 09 00 Instrumentation and Control for HVAC

The design of the HVAC system should provide for a complete system of automatic temperature control of the direct digital type as manufactured by Johnson Control Company. No other control manufacturer will be allowed.

The control system shall provide a distributed process network control system complete with all necessary hardware and software, including all required programming. The system shall be PC microprocessor based and monitored by connection to the existing University network.

Consult with the Project Manager for contact and coordination information concerning the Johnson Control system to be utilized in the facility.

The Owner will provide a fiber optic data transmission cable to the specified site location to transmit data to the University Energy Management System.

23 20 00 HVAC Piping and Pumps

23 21 00 Hydronic Piping and Pumps

Specify that all piping be neatly arranged, running parallel with the primary lines of the building construction, and that right-of-way be given to piping that must slope for drainage. All changes in piping directions shall be made with the applicable fittings.

Specify that unions or flanges are to be provided at all connections to each piece of equipment and on both sides of automatic valves and devices that require removal for maintenance.

Specify that bronze adaptors are to be used at all copper to flanged or I.P.S. connections.

In locations where piping passes through or under corrosive fill or walls, specify that the piping shall be protected through the full depth of the construction by protective coating, wrapping, or with galvanized sleeves. Sleeves shall be at least two pipe sizes larger than the pipe plus insulation.

Specify that all bare steel piping, pipe hangers, supports and miscellaneous metal mechanical rooms and elsewhere exposed to view shall be cleaned and painted in accordance with requirements specified in Division 09.

23 07 00 HVAC Insulation

23 07 13 HVAC Duct Insulation

Specify that sheet metal duct insulation should be glued with insulation bonding adhesive covering at least 50% of the surface. Mechanical fasteners should be installed on not more than 18” centers on bottoms of ducts greater than 24” wide. Punctures should be sealed with adhesive and foil reinforced tape. Lap longitudinal and traverse joints, 2” minimum, and wrap insulation with 18 gauge stainless steel wire, 18” maximum on centers.

Insulation should not be pulled overly tight around ducts when wrapping. Use 24” minimum length board type insulation on bottoms of ducts at trapeze hangers. Staples are not to be permitted. Insulation should be installed on exterior of duct only. No duct liner is permitted. All exposed insulation in mechanical rooms should be finished with canvas. Return ducts, exhaust ducts and outside air ducts should not be insulated. All duct insulation shall have a UL flame spread rating not exceeding 25 and a smoke developed rating not exceeding 50 as tested by ASTM E-84, and must meet the requirements of NFPA 90-A.

23 07 19 HVAC Piping Insulation

Specify that piping shall not be covered with insulation until all pressure testing has been completed.

Specify that pipe insulation shall be installed with staggered longitudinal joints.

Specify the use of vapor barriers for insulated pipes that may be subject to condensation on its exterior or on piping located in damp areas.

Steam, condensate, and vent piping shall have insulation applied with side and end joints butted tightly.

Specify that a factory applied 8 oz. canvas jacket be installed smoothly over longitudinal and circumferential joints.

Pipes fittings and valves on hot water lines should be insulated with insulation equal in thickness with the associated piping.

Pipes fittings and valves on cold water and chilled water lines should be insulated with fabricated or mitered sections of pipe insulation or pre-molded sections, vapor sealed with glass fabric embedded between two coats of Foster 60-30-N adhesive.

Pipe fittings and valves on steam, condensate, and vent lines should be insulated with fabricated, mitered segments of pipe insulation. At screen strainers and other fittings requiring routine access for maintenance, fabricate the insulation so that it can be removed and replaced as necessary.

Specify that each pipe support on piping 2” and larger shall be provided with equal thickness 12” long sections of Foamglas with jacket carried continuously over Foamglas and vapor sealed as appropriate.

23 30 00 HVAC Air Distribution

23 38 13 Commercial Kitchen Hoods

Specify that fire suppression systems shall be installed on all for cooking exhaust hoods. The hood shall exhaust to the exterior of the building. The system shall comply with the latest edition of NFPA 96.

23 86 16 Fume Hoods

Both teaching and research laboratories that are designed to be equipped with ventilation fume hoods should be well planned with the necessary duct work system to support the hood operation. The Clemson University Department of Environmental Health and Safety has guidelines on the operation, maintenance, and design information in a publication titled Clemson University Chemical Hood Program.

23 40 00 HVAC Air Cleaning Devices

23 41 00 Particulate Air Filtration

Indoor air quality (IAQ) should be a major consideration in the design of air filtration systems for HVAC systems in facilities at Clemson University.

Filtration design should be based on ASHRAE 52.2-1999 to provide MERV 8 or better filtration according to the application. Higher standards may be necessary for some laboratory applications and clean room designs.

Roll-a-matic air filter systems shall be designed and included as pre-filters for all HEPA filter banks in order to extend the life of HEPA filter banks.

23 60 00 Central Cooling Equipment

23 64 00 Packaged Water Chillers

Centrifugal chillers are preferred to be used at Clemson University. Refrigerants should be selected based on current availability, but the chiller shall be capable of being easily converted to accommodate the use of less ozone depleting refrigerants as they become commercially available.

23 70 00 Central HVAC Equipment

23 73 00 Indoor Central Station Air Handling Units

Air handling units shall be appropriately sized and selected to fit the application with the appropriate modules for the required functions. All air handling units within the facility shall be specified to be supplied by a single manufacturer.

23 80 00 Decentralized HVAC Equipment

23 81 26 Split-System-Air-Conditioners

Provide hail guards for condensers

Comb out any damaged fins or replace coil if fins cannot be combed to a like-new condition prior to installing guards.

23 82 19 Fan Coil Units

Specify each unit shall have the following:

Cabinets to have extended pocket, 18 gauge galvanized construction, closed cell insulation with insulated stainless steel drain pan. Coordinate finish color with Project Manager. All floor mounted unit models shall have sloped tops.

Provide 1” pleated filter sets. Install new filters after Substantial Completion.

Provide factory installed service disconnect switch.

Provide that condensate overflow switch shall be installed. All chilled water piping components shall be located above auxiliary drain pan. Units to be configured for chilled water and hot water connections on either side of the unit.

Fan Motors shall be Full Range ECM. All cooling and heating performance data must be based on high speed fan operation.

Chilled Water EWT shall be = 48 degrees. Hot Water EWT shall be = 160 degrees.

A Preheat Coil shall be installed and Low Limit protection shall be provided if the unit has Outside Air connected to the unit. Coils shall be furnished with manual air vents. Chilled Water and Heating Coils shall be downstream of Preheat Coil. Heating Coil shall be located downstream of Chilled Water Coil.

All piping and piping components inside Fan Coil shall be factory supplied or factory installed. If piping package is shipped loose for field install, the union connection shall be factory installed. Piping packages will consist of: Supply side to have shut off valve, strainer with hose drain fitting and cap, union connections. Return side to have proportional control valve, automatic flow limiting balance valve, shut off valve and union connections.

All control valve actuators shall be proportional control 0-10VDC. All control valves shall be 2-way configuration. All control analog inputs and outputs shall have the ability to be field calibrated.

All units shall have the following points configured:

Discharge Air Temp, Room Temperature, Occupied Mode, Occupied Cooling SPT, Occupied Heating SPT, Standby Cooling SPT, Standby Heating SPT, Unoccupied Cooling SPT, Unoccupied Heating SPT, Supply Fan Start/Stop, Supply Fan Status, Condensate Overflow Switch Status

IF DEHUMIDIFICATION IS REQUIRED: Room Humidity, Dehumidification SPT

IF ECM MOTOR IS INSTALLED Supply Fan Speed Control

IF UNIT HAS OUTSIDE AIR CONNECTED Outside Air Damper Position, Low Limit Status, Room CO2

Unit microprocessor shall be factory supplied or factory installed and must have BacNet communication capability. All set points shall be adjustable via BacNet communication.

Specify a minimum of 8 hours of owner training for unit controls and operation startup with commissioning. All software and hardware for the field accessibility of the unit controls is required.

Thermostats shall be wall mounted. Thermostats shall have the capability of range limits and “dead band” control in accordance with the University Sustainable Energy Policy.





Access Doors (Equipment)

Titus, Krueger, Cesco, Dowco, Air Balance, Kees, Louvers & Dampers, Ruskin

Air Control Tank Fittings

Bell & Gossett

Air Filtration Media

Comply with guidelines listed in Section 23 40 00 (above).

Air Handling Units

Trane, Carrier, York – all units in a facility by same manufacturer


Trane, Carrier


Manual Volume Control Dampers: Ruskin, Dowco, Louvers & Dampers, Air Balance,Arrow

Fire Dampers: Air Balance, Louvers & Dampers, Prefco

Exhaust Fans

Carnes, Jenn-Aire, I.L.G., Penn, Acme, Greenheck, Broan, Cook

Fan Coil Units

Trane, Johnson Controls, Rittling

Flexible Ducts

Wiremold, United States Metal, Clevepack, Metal Flex

Flow Switches

McDonnell-Miller FS-4

Gas Piping

Black Iron, Schedule 40, meeting ASTM A53f or A120

Fittings: <2-1/2"-screwed fittings

             >2-1/2"-flanged or welded connections

All black iron gas fittings shall be malleable black iron. No Teflon tape shall be used on gas piping.

Hangers and Support Devices

Grinnell, Unistrut, Fee & Mason, Elcene Kindorf, Mueller, Auto Grip


Chilled Water and Dual Temp Piping: 1-1/2” Fiberglass with 850 degree F rating with self sealing all purpose jacket, 25/50 spread/smoke development rating. Insulation on fittings and valves on hot water and chilled water lines should consist of insulating cement finished with a canvas jacket dipped in Arabol or aluminum sheet metal held in place with aluminum straps.

High Pressure Steam Piping and High Pressure Condensate: Thermal Pipe Systems Super Temp-Tite.

Low Pressure Steam and Condensate Piping: 1-1/2" O.C. Kaylo, 12.5 lb. density, with factor applied canvas jacket and sizing.

Hot Water Storage Tanks and Generators: 3” blocks of 85% magnesia, securely wired into place, covered with 1-1/2” mesh wire with layer of plastic insulating cement 3/8” troweled over the wire, then finished with a 1/8” layer of hard finish cement, troweled to smooth hard finish.

Converters: Same as hot water storage tanks, except use ½” magnesia and add one coat of vapor barrier sealant.

Refrigerant Piping: 1” Armaflex

Supply Ducts (Exposed Areas): 1-1/2” glass fiber blanket, ¾ lb. density with .002 aluminum foil backing as manufactured by Owens-Corning, Certainteed, Johns-Manville, Armstrong, or BFG.

Supply Ducts (Exposed Areas): 1-1/2” fiberglass, 3.0 lbs/cf density, with foil reinforced Kraft jacket (O-C Type 703)

PVC Fitting Covers: Certainteed

Mastics, Coatings, and Adhesives

Mastics: Insul-Coustic, Lion Oil, Foster, Armstrong, Childers white breaker coating, or Foster 30-36

Breather Mastic: Foster GPM

White Vapor Barrier Coating: Foster 30-35

Duct Insulation Adhesive: Foster 85-20

Lap Adhesive: Foster 85-75

Flexible Joint Sealer: Foster 30-35

Packaged AC Equipment

Trane, Carrier, Lenox, York

Pressure Gauges



Taco (preferred)

Bell & Gossett

Patterson Pumps

Steam Flow Meter

Veris-Acclelabar Model AFS with Foxboro IMV30 Multivariable Transmitter with remote mount, instantaneous steam flow rate (lbs/hr) and energy total (BTU x 100), and connectivity to Johnson Control Metasys.

Chilled Water Meter

Onicon Sysem-10-N2/BACnet Model F-1100 Featuring campus flow (gpm), instantaneous energy rate (KBTU/hr) and energy total (BTU x 100), and connectivity to campus Johnson Control Metasys.

Steam Traps

Sarco, ITT, or Hoffman & Armstrong

High Pressure Steam Piping and High Pressure Condensate

Thermal Pipe Systems Super Temp-Tite

Condensate and Chilled Water Piping

Piping: Meeting ASTM A120 Grade A or ASTM A53 Grade

Fittings: Meeting ASTM A234

< 2-1/2” – screwed fittings

> 2-1/2” – butt weld fittings

Unions: Federal Specs WW-V-531 Type B less than 2”

Flanges: Meeting ASTM A181 Grade I (Forged carbon steel – weld neck)

Gaskets: Compression type with spirotallic construction without asbestos


Weiss DVS35 to Weiss DVU35


Steam Valves: 250 lb. with welded connections

Chilled Water and Heating System Valves: Wafer butterfly type – Demco or Nibco, Watts