Revised Specifications - the Public Building Commission of Chicago

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PEL Standard Specification_Rev 6/8/2010 Project Rev A_07/02/10 5. Access Ports: NPS 1/4 connections at entering and leaving sides for pressure differential measurement. 6. Maximum Pressure Loss: 2 psig. 7. Rated Flow: 8. Working Pressure Rating: 500 psig. 9. Maximum Operating Temperature: 240 deg F. K. Receivers: Comply with ARI 495. 1. Comply with ASME Boiler and Pressure Vessel Code; listed and labeled by an NRTL. 2. Comply with UL 207; listed and labeled by an NRTL. 3. Body: Welded steel with corrosion-resistant coating. 4. Tappings: Inlet, outlet, liquid level indicator, and safety relief valve. 5. End Connections: Socket. 6. Working Pressure Rating: 500 psig. 7. Maximum Operating Temperature: 275 deg F. L. Liquid Accumulators: Comply with ARI 495. 1. Body: Welded steel with corrosion-resistant coating. 2. End Connections: Socket. 3. Working Pressure Rating: 500 psig. 4. Maximum Operating Temperature: 275 deg F. 2.4 REFRIGERANTS A. ASHRAE 34, R-407C: Difluoromethane/Pentafluoroethane/1,1,1,2-Tetrafluoroethane. B. ASHRAE 34, R-410A: Pentafluoroethane/Difluoromethane. PART 3 - EXECUTION 3.1 PIPING APPLICATIONS FOR REFRIGERANT R-407C A. Suction Lines for Conventional Air-Conditioning Applications: Copper, Type ACR or K, drawn-temper tubing and wrought-copper fittings with brazed joints. B. Hot-Gas and Liquid Lines: Copper, Type ACR or K, drawn-temper tubing and wroughtcopper fittings with brazed joints. C. Safety-Relief-Valve Discharge Piping: Copper, Type ACR or K, drawn-temper tubing and wrought-copper fittings with brazed joints. CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 15183-6 REFRIGERANT PIPING PBC-PROJECT# 09070
PEL Standard Specification_Rev 6/8/2010 Project Rev A_07/02/10 3.2 PIPING APPLICATIONS FOR REFRIGERANT R-410A A. Suction Lines NPS 3-1/2 and Smaller for Conventional Air-Conditioning Applications: Copper, Type ACR or K, drawn-temper tubing and wrought-copper fittings with brazed joints. B. Hot-Gas and Liquid Lines: Copper, Type ACR or K, annealed- or drawn-temper tubing and wrought-copper fittings with brazed joints. C. Safety-Relief-Valve Discharge Piping: Copper, Type ACR or K, annealed- or drawntemper tubing and wrought-copper fittings with brazed joints. 3.3 VALVE AND SPECIALTY APPLICATIONS A. Install packed-angle valves in suction and discharge lines of compressor. B. Install service valves for gage taps at inlet and outlet of hot-gas bypass valves and strainers if they are not an integral part of valves and strainers. C. Install a check valve at the compressor discharge and a liquid accumulator at the compressor suction connection. D. Except as otherwise indicated, install packed-angle valves on inlet and outlet side of filter dryers. E. Install a full-sized, three-valve bypass around filter dryers. F. Install solenoid valves upstream from each expansion valve and hot-gas bypass valve. Install solenoid valves in horizontal lines with coil at top. G. Install thermostatic expansion valves as close as possible to distributors on evaporators. 1. Install valve so diaphragm case is warmer than bulb. 2. Secure bulb to clean, straight, horizontal section of suction line using two bulb straps. Do not mount bulb in a trap or at bottom of the line. 3. If external equalizer lines are required, make connection where it will reflect suction-line pressure at bulb location. H. Install safety relief valves where required by ASME Boiler and Pressure Vessel Code. Pipe safety-relief-valve discharge line to outside according to ASHRAE 15. I. Install moisture/liquid indicators in liquid line at the inlet of the thermostatic expansion valve or at the inlet of the evaporator coil capillary tube. J. Install strainers upstream from and adjacent to the following unless they are furnished as an integral assembly for device being protected: 1. Solenoid valves. 2. Thermostatic expansion valves. 3. Hot-gas bypass valves. CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 15183-7 REFRIGERANT PIPING PBC-PROJECT# 09070
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Revised Specifications - the Public Building Commission of Chicago

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