A. Types of equipment specified in this section include the following:

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1 SECTION HVAC HYDRONIC SYSTEMS PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and other Division 01 Specification Sections, apply to this Section. B. Refer to Section : Pipes, Valves and Piping Specialties. 1.2 DESCRIPTION OF WORK A. Types of equipment specified in this section include the following: 1. Hydronic Piping and Specialties. 2. Unit Heaters. 3. Coils. 4. Inhibited Propylene Glycol. 5. Pre-Startup Cleaning of HVAC Piping Systems. 6. Chemical System Water Treatment. 7. Closed System Water Treatment. PART 2 - PRODUCTS 2.1 BASIC PIPES AND PIPE FITTINGS A. General: Provide piping materials and factory-fabricated piping specialties of sizes, types, pressure ratings, temperature ratings, and capacities as indicated. Provide materials and products complying with ASME B31.9 Code for Building Services Piping where applicable, base pressure rating on hydronic piping systems maximum design pressures. Provide sizes and types matching piping and equipment connections; provide fittings of materials which match pipe materials used in hydronic piping systems. Provide pipes and pipe fittings complying with Division 23, Section MOTORS AND VARIABLE FREQUENCY DRIVES A. For products contained in this section requiring motors and variable frequency drives, motors and frequency drives shall comply with the requirements of Division 23, Section BASIC VALVES A. General: Provide valves complying with Section and in accordance with the following listing: HVAC HYDRONIC SYSTEMS

2 B. Shutoff Valves: 1. 3" and smaller: Ball valves. 2. 4" and larger: Butterfly valves only. C. Drain Valves: 1. 3" and smaller: Ball valves. 2. 4" and larger: Butterfly valves only. D. Check Valves: 1. Refer to Part 3 Execution section of this Specification section for check valve requirements. E. Balance Valves: 1. 2" and smaller: Venturi type. 2. 2" and smaller: Variable CV/Orifice type /2" and larger: Plug or ball eccentric type valve upstream of flow measuring station or as indicated on drawings. See Section for flow measuring station. F. Acceptable Manufacturers: Refer to Division 23, Section AIR VENT VALVES A. Manual Air Vent Valves: Provide manual vent valves designed to be operated manually with screwdriver or thumbscrew, 1/8" NPS connection. B. Automatic Air Vent Valves: Provide automatic vent valves designed to vent automatically with float principle, stainless steel float and mechanisms, cast-iron body, pressure rated for 125 psi, ½" or ¾ NPS inlet and outlet connections. C. Acceptable Manufacturers: 1. Armstrong 2. Bell & Gossett ITT. 3. Hoffman Specialty ITT. 4. Spirax Sarco. 5. Taco, Inc. 6. Thrush. 2.5 UNIT HEATERS A. General: Provide unit heaters in locations as indicated, and of capacities, style, and having accessories as scheduled. B. Horizontal Unit Heaters: HVAC HYDRONIC SYSTEMS

3 1. Casings: Construct of steel, phosphatized inside and out, and finished with baked enamel. Provide motor-mounted panel, minimum of 18-gauge steel. Fabricate casing to enclose coil, louvers, and fan blades. Provide louvers for 4-way air diffusion. 2. Fans: Construct of aluminum, and factory-balance. Provide fan inlet orifice, smooth, and drawn into casing back panel. C. Coils: Construct of plate-type aluminum fins, mechanically bonded to copper tubes. Design coil for use in hot water applications. D. Motors: Provide totally enclosed motors, with built-in overload protection, having electrical characteristics as scheduled. E. Accessories: Provide the following accessories: 1. Mounting Bracket. F. Acceptable Manufacturers: 1. Airtherm Mfg. Co. 2. McQuay Inc. 3. Modine Mfg. Co. 4. Sterling Hydronics. 5. Trane (The) Co. 6. Vulcan Radiator Co. 2.6 COILS A. General: Provide coils of size and in location indicated, and of capacities and having performance data as scheduled. Certify coil capacities, pressure drops, and selection procedures in accordance with ARI 410. B. Heating Coils: 1. Fins: Construct of continuous aluminum or copper configurated plate-fin type with full fin collars for accurate spacing and maximum fin-tube contact. 2. Tubes: Construct of copper tubing, expanded into fin collars for permanent fin-tube bond and expanded into header for permanent leaktight joint. 3. Headers: Construct of gray cast iron for coils 33" high and smaller. Hydrostatically test to 400 psi before assembly. Construct of round seamless copper tube for coils over 33" high. 4. Casings: Construct of 16-gauge continuous coated galvanized steel with fins recessed into channels to minimize air bypass. 5. Testing: Proof test coils at 300 psi, leak test at 200 psi under water. 6. Coil Types: Provide the following coil types as indicated, and as scheduled. a. Hot Water to 200 psi, 250 F: Provide 1-row, 5/8" tubes, opposite-end connection coil. b. Hot Water to 200 psi, 325 F: Provide 1-row, 5/8" tubes, opposite-end connection coil. Reinforce each tube- to-header joint with brass bushing. c. Hot Water to 200 psi, 220 F: Provide 2-row, 5/8" tubes, same-end connection coil. Provide rolled tube-to- header joints for coil heights 33" and smaller. Provide brazed tube-to-header joints for coil heights over 33". HVAC HYDRONIC SYSTEMS

4 d. Hot Water to 225 psi, 325 F: Provide 1- or 2-row, 5/8" tubes, same-end connection, dual-tube-feed coil. Reinforce tube-to-header joints with brass bushings and provide expanded joints. e. Hot Water to 225 psi, 325 F: Provide 1- or 2-rows, 5/8" tubes, single tube continuous circuit, same-end connection coil. Roll connection tube. C. Acceptable Manufacturers: 1. McQuay Inc. 2. Temtrol. 3. Trane (The) Co. 2.7 INHIBITED PROPYLENE GLYCOL A. Product: Antifreeze Heat Transfer Fluid B. Description: An inhibited propylene glycol that is clear and odorless. C. Provide: In specified concentrations as listed in this section. D. Acceptable Manufacturer: 1. Atlantic Richfield. 2. Texaco. 3. The Dow Chemical Company. 4. Union Carbide. 5. Huntsman. 2.8 PRE-STARTUP CLEANER A. Provide a pre-startup liquid alkaline dispersant cleaner for the flushing and cleaning of all HVAC water systems to remove oil and foreign matter from the piping and equipment prior to the final filling of the systems. This chemical shall not be injurious to persons, piping, pipe joint compounds, packings, coils, valves, pumps, and their mechanical seals, tubes or other parts of the system. B. Furnish complete instruction dictating the quantities of the cleaner to use, methods, and durations of the operation. 2.9 CLOSED SYSTEM WATER TREATMENT CHEMICALS A. Provide liquid nitrite corrosion inhibitor treatment for the prevention of corrosion in closed systems at 1000 PPM total nitrite level. HVAC HYDRONIC SYSTEMS

5 PART 3 - EXECUTION 3.1 INSPECTION A. General: Examine areas and conditions under which hydronic systems materials and products are to be installed. Do not proceed with work until unsatisfactory conditions have been corrected in manner acceptable to the installer. 3.2 ELECTRICAL WIRING A. General: Install electrical devices furnished by manufacturer but not specified to be factorymounted. Furnish copy of manufacturer's wiring diagram submittal to Electrical Installer. 1. Verify that electrical wiring installation is in accordance with manufacturer's submittal and installation requirements of Division-26 sections. Do not proceed with equipment start-up until wiring installation is acceptable to equipment installer. 3.3 INSTALLATION OF HYDRONIC PIPING A. Install eccentric reducers where pipe is reduced in size in direction of flow, with tops of both pipes and reducer flush. B. Install piping level with no pitch. C. Connect branch-feed piping to mains at horizontal center line of mains, connect run-out piping to branches at horizontal center line of branches. D. Locate groups of pipes parallel to each other, spaced to permit applying full insulation and servicing of valves. E. Copper piping joints shall have pipe cut square, and reamed with burrs removed. Clean with medium grit emory cloth, flux pipe and fitting with nokorode paste. Use only 95-5 solder. F. Refer to Section for hanger and support requirements. G. Refer to Section for provisions for movement in hydronic piping. 3.4 INSTALLATION OF VALVES A. Shutoff Valves: Install on inlet and outlet of each mechanical equipment item, on branch lines serving three or more terminal units, and elsewhere as indicated. B. Drain Valves: Install on each mechanical equipment item located to completely drain equipment for service or repair. Install at base of each riser, at base of each rise or drop in piping system, and elsewhere where indicated or required to completely drain hydronic piping system. HVAC HYDRONIC SYSTEMS

6 C. Install wafer checks on all pump applications (in-line pumps, base mounted pumps, pumped coils). Install swing check valves for all other applications. All swing check valves shall be installed in the horizontal position. Vertical installation is not acceptable. D. Balance Valves: Install balance valve on outlet of each hydronic terminal, on end of each hydronic zone circuit, on discharge of each hydronic pump, on branch return lines serving three of more terminal units, and elsewhere as indicated. After hydronic system balancing has been completed, permanently mark final balanced position with memory stop or yellow lacquer across body. 3.5 INSTALLATION OF HYDRONIC SPECIALTIES A. Balancing Devices: 1. Balancing devices to all hydronic terminals shall be furnished and installed so that the flow to each device can be read and adjusted by the Test and Balance contractor. This includes but is not limited to the following: a. Install P&T test plugs on the inlet and outlet to every hydronic terminal device, whether or not shown. This shall include chillers, boilers, heat exchangers, coils, pumps, heaters, etc. b. Install flow measuring/balancing devices (circuit setters or venturis with balance valves) at each hydronic device, whether or not shown, so that flow rates can be read, adjusted and set. B. Vent Valves: 1. Manual Vent Valves: Install manual vent valves on each hydronic terminal at highest point, and on each hydronic piping drop in direction of flow for mains, branches, and runouts, and elsewhere as indicated. 2. Install a full size air chamber and pipe down with 1/4" copper tubing to a petcock or key vent. If the vent is above ceiling, install the petcock 6" above the ceiling. Provide manual air vent fittings on all hydronic coils. Extend air vents to workable levels in gymnasium. 3. Automatic Vent Valves: Install automatic vent valves at top of each hydronic riser and elsewhere as indicated. Install shutoff valve between riser and vent valve, pipe outlet to suitable plumbing drain, or as indicated. C. Diverting Fittings: Install diverting fittings as indicated and in accordance with manufacturer's instructions. Position fittings on supply and return mains with proper orientation for flow. D. Control Components: Furnish and install flow switches, flow sensors, thermowells and pressure/temperature taps in accordance with the manufacturer s recommendations. Install control valves furnished by the temperature controls contractor. 3.6 INSTALLATION OF UNIT HEATERS A. General: Install unit heaters as indicated, and in accordance with manufacturer's installation instructions. HVAC HYDRONIC SYSTEMS

7 B. Uncrate units and inspect for damage. Verify that nameplate data corresponds with unit designation. C. Hang units from building substrate, not from piping. Mount as high as possible to maintain greatest headroom possible unless otherwise indicated. D. Support units with rod-type hangers anchored to building substrate. E. Install piping as indicated. F. Protect units with protective covers during balance of construction. 3.7 INSTALLATION OF COILS A. General: Install coils as indicated, and in accordance with manufacturer's installation instructions. B. Pitch coil casings for drainage, not less than 1/8" toward return connections, except where drainage feature is included in coil design. C. Provide for each cooling coil, stainless steel drain pan under each coil supported off of floor of sufficient height to allow installation of condensate trap to allow drainage of condensate from pan. Provide a secondary drain or auxiliary drain pan where damage to building components will occur as a result of overflow. 3.8 INHIBITED PROPYLENE GLYCOL TREATMENT A. After each system has been cleaned and flushed as described in Section "Cleaning, Flushing, Inspection," it shall be filled with a solution of water and the following percentage by volume of inhibited propylene glycol: 1. Heating Water System: 30% 3.9 ADJUSTING AND CLEANING A. General: After construction is completed, including painting, clean unit exposed surfaces, vacuum clean terminal coils and inside of cabinets. B. Retouch any marred or scratched surfaces of factory-finished cabinets, using finish materials furnished by manufacturer. C. Install new filter units for terminals requiring same SYSTEM START-UP A. The Water Treatment Supplier shall put the treatment equipment into operation, and make adjustments necessary for proper operation. HVAC HYDRONIC SYSTEMS

8 B. The Water Treatment Supplier shall provide a written report to the Division 23 Contractor indicating that the start-up has been completed and that all equipment is operating properly SPARE PARTS A. Furnish to Owner, with receipt, one spare set of belts for each type of belt driven centrifugal fan. B. Furnish to Owner, with receipt, one set of filters for each type of unit requiring filters OPERATOR TRAINING AND SERVICE A. The Water Treatment Supplier shall instruct the Owner's operating personnel so as to familiarize them with all treatment equipment and procedures per Maintenance Service specified in Part 1 of this Section. END OF SECTION HVAC HYDRONIC SYSTEMS