SECTION 230519 - METERS AND GAUGES FOR HVAC PIPING PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Provisions of the Contract and of the Contract Documents apply to this Section. 1.2 ABBREVIATIONS A. Degree or degrees. B. AFF Above Finished Floor. C. BAS Building Automation System D. F Fahrenheit. E. GPM Gallons Per Minute. F. ma Milliamp, or Milliamps. G. PSI Pounds per Square Inch. H. PSIG Pounds per Square Inch Gauge. I. V Volt, or Volts 1.3 SUBMITTALS A. Product Data: For each type of product indicated. B. Wiring Diagrams: For power, signal, and control wiring. C. Operation and Maintenance Data: For meters and gages to include in operation and maintenance manuals. PART 2 - PRODUCTS 2.1 THERMOMETERS A. Available Manufacturers: METERS AND GAUGES FOR HVAC PIPING 230519-1
1. Flo Fab Inc. 2. Miljoco Corporation. 3. Palmer Wahl Instrumentation Group. 4. Tel-Tru Manufacturing Company. 5. Trerice, H. O. Co. 6. Weiss Instruments, Inc. 7. Winters Instruments - U.S. B. Standard: ASME B40.200. C. Case: Cast aluminum D. Size: 12 nominal unless otherwise indicated. E. Case Form: Adjustable angle. F. Tube: Glass with magnifying lens and blue or red organic liquid. Mercury is not acceptable. G. Tube Background: Nonreflective aluminum with permanently etched scale markings graduated in 2 F increments. H. Window: Glass. I. Stem: 1. Duct Installation: Aluminum ventilated. 2. Pipe Installation: Brass. J. Thermowell Connector for Pipe Installation: 1¼ with ASME B1.1 threads. K. Accuracy: Plus or minus one scale division. L. Scale Range: Suitable for service. 2.2 DUCT THERMOMETER MOUNTING BRACKETS A. Description: Flanged bracket with screw holes for attachment to air duct and made to hold thermometer stem. 2.3 THERMOWELLS A. Thermowells: 1. Standard: ASME B40.200. 2. Description: Manufactured by thermometer manufacturer, pressure-tight, socket-type fitting made for insertion into piping tee. 3. Material: METERS AND GAUGES FOR HVAC PIPING 230519-2
a. Copper Tubing/Piping: Brass. b. Steel Piping: Type 316 stainless steel 4. Type: Stepped shank unless straight or tapered shank is recommended by manufacturer. 5. Bore: Diameter required to match thermometer stem. 6. Insertion Length: Length required to match thermometer stem and to reach center of pipe. 7. Lagging Extension: Include for insulated piping and tubing. 8. Heat transfer medium: As available and recommended by manufacturer. 2.4 PRESSURE GAGES 1. Available Manufacturers: a. Ernst Flow Industries. b. Flo Fab Inc. c. Palmer Wahl Instrumentation Group. d. Tel-Tru Manufacturing Company. e. Trerice, H. O. Co. f. Watts Regulator Co.; a div. of Watts Water Technologies, Inc. g. Weiss Instruments, Inc. 2. Application Standard: ASME B40.100. 3. Case: Dry, field liquid fillable, satin finished, type 304 stainless steel, stem mounted, flangeless. 4. Pressure-Element Assembly: Bronze tube. 5. Pressure Connection: Brass, with ¼ or ½ ASME B1.20.1 pipe threads and bottomoutlet unless back-outlet is indicated. 6. Movement: Stainless steel. 7. Dial Size: 6 8. Dial Face: Nonreflective aluminum with permanently etched black scale markings graduated in psi. Two PSI maximum per graduation. 9. Pointer: Adjustable black metal. 10. Window: Glass. 11. Ring: 304 stainless steel. 12. Accuracy: Grade 1A, plus or minus 1 percent of full scale. 13. Units: PSI 14. Scale range: Suitable for service 2.5 GAGE ATTACHMENTS A. Pulsation Dampener: ASME B40.100, brass; with ¼ or ½, ASME B1.20.1 pipe threads and piston type surge-dampening device. Include extension for use on insulated piping. B. Siphons: Loop-shaped section of brass for copper, and stainless steel for steel, pipe filled with water with ¼ or ½ pipe threads to prevent live steam from entering gauge. Provide on all gauges serving steam systems. METERS AND GAUGES FOR HVAC PIPING 230519-3
C. Valves: Brass needle for copper pipe, or stainless-steel needle for steel pipe, with ¼ or ½, ASME B1.20.1 pipe threads. 2.6 TEMPERATURE/PRESSURE PLUG A. Available Manufacturers: 1. Flow Design, Inc. 2. Trerice, H. O. Co. 3. Watts Regulator Co.; a div. of Watts Water Technologies, Inc. 4. Weiss Instruments, Inc. B. Description: Test fitting made for insertion into piping tee fitting. C. Body: Brass or stainless steel with core inserts and gasketed and threaded cap. Include extended stem on units to be installed in insulated piping. D. Thread Size: ½, ASME B1.20.1 pipe thread. E. Minimum Pressure and Temperature Rating: 500 psig at 200 F. F. Core Inserts: EPDM self-sealing rubber. 2.7 TEMPERATURE/PRESSURE PLUG KITS A. Available Manufacturers: 1. Flow Design, Inc. 2. Trerice, H. O. Co. 3. Watts Regulator Co.; a div. of Watts Water Technologies, Inc. 4. Weiss Instruments, Inc. B. Provide one temperature/pressure plug kit containing two thermometers, one pressure gauge, pressure gauge adapter, and carrying case. Thermometer sensing elements, pressure gauge, and gauge adapter probes shall be of a diameter to fit temperature/pressure plugs and of length to project into piping. C. Low Range Thermometer: Small, bimetallic insertion type with 1 to 2 diameter dial and tapered-end sensing element. Dial range shall be at least 25 to 125 F. D. High Range Thermometer: Small, bimetallic insertion type with 1 to 2 diameter dial and tapered-end sensing element. Dial range shall be at least 0 to 220 F. E. Pressure Gage: Small, Bourdon-tube insertion type with 2 to 3 diameter dial and probe. Dial range shall be at least 0 to 200 PSIG. F. Carrying Case: Metal or plastic, with formed instrument padding. METERS AND GAUGES FOR HVAC PIPING 230519-4
PART 3 - EXECUTION 3.1 INSTALLATION A. Thermowells: 1. In all locations install so thermometer will be easily visible. 2. In horizontal piping install with socket extending to center of pipe and in vertical position in piping tees. 3. In vertical piping install with socket extending to center of pipe and in horizontal position in piping tees. B. Install thermowells of sizes required to match thermometer connectors. C. Install thermowells with lagging extension on insulated piping. D. Fill thermowells with heat-transfer medium as recommended by manufacturer. E. Install thermometers in thermowells and adjust vertical and tilted positions so they are with-in 15 (Measured from 6 above the floor) of an easily accessible location and the window is perpendicular to that location. 1. Exception: Where installed in piping or ductwork located in excess of 20 AFF. F. Install duct-thermometer mounting brackets in walls of ducts. Attach to duct with screws. G. Install thermometers in the following locations: 1. Where indicated 2. Inlet and outlet of each hydronic zone. 3. Inlet and outlet of each hydronic boiler. 4. Inlet(s) and outlet(s) of each chiller. 5. Inlet and outlet of each hydronic coil in air-handling units. 6. Inlet(s) and outlet(s) of each hydronic heat exchanger. 7. Inlet and outlet of each thermal-storage tank. 8. Outside, return, and supply air ducts. H. Install pressure gages in piping tees with pressure gage located on pipe at the most readable position. I. Install pressure gages in the following locations: 1. Inlet an outlet of each pressure-reducing valve. 2. Inlet and outlet of each chiller. 3. Inlet and outlet of each boiler. 4. Inlet and outlet of each coil. a. Exceptions (Install test plugs instead): 1) Fan coil units. 2) Variable volume terminal units. 3) Blower coil units. METERS AND GAUGES FOR HVAC PIPING 230519-5
5. Inlet of each thermal-storage tank. 6. Suction and discharge of each pump. J. Install valve in piping for each pressure gage. K. Install snubber in piping for each pressure gage for fluids (except steam). L. Install siphon fitting in piping for each pressure gage (for steam). M. Install test plugs in piping tees where indicated and at all pipe mounted BAS pressure and temperature sensors. 3.2 CONNECTIONS A. Install meters and gages adjacent to machines and equipment to allow service, maintenance, and cleaning of meters, gages, machines, and equipment. B. Connect flowmeter elements to meters. C. Connect flowmeter transmitters to meters. 3.3 ADJUSTING A. After installation, calibrate meters according to manufacturer's written instructions. B. Adjust faces of meters and gages to proper angle for best visibility. END OF SECTION 230519 METERS AND GAUGES FOR HVAC PIPING 230519-6