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American Society of Heating and Ventilating Engineers Guide, 1937 SYMBOLS FOR HEATING, VENTILATING AND AIR CONDITIONING DRAWINGS5 X. The objects of this standard set of symbols are to insure the correct interpretation of drawings and to conserve drafting room time by establishing simple and unmistakable symbols for the component parts of the heating and ventilating systems. In preparing the list of symbols an effort has been made to follow existing practice in so far as possible but the list cannot be expected to match exactly the existing practice of every drafting room. 1. General Piping 6. Air Piping 2. Steam Piping 7. Vacuum Piping 3. Condensate Piping 4. Cold Water Piping 8. Gas Piping 9. Refrigerant Piping I----- H------ i-----+-- 5. Hot Water Piping 10. Oil Piping 11. Lock and Shield Valve 12. Reducing Valve 23. Indirect Radiator Plan 24. Indirect Radiator Elevation cm OB 13. Diaphragm Valve -do- Jr- 14. Thermostat `15. Radiator Trap Elevation 16. Radiator Trap Plan 17. Tube Radiator Plan 9 -1 cm no18. Tube Radiator Elevation 19. Wall Radiator Plan `=' 20. Wall Radiator Elevation 21. Pipe Coil Plan 0 22. Pipe Coil Elevation ^=oii 25. Supply Duct, Section 26. Exhaust Duct, Section 27. Butterfly Damper Plan (or Elevation) 28. Butterfly Damper Elevation (or Plan) 29. Deflecting Damper Rectangular Pipe 30. Vanes 31. Air Supply Outlet 32. Exhaust Inlet ' 0 0 -LL 1 T T *From A.S.H.V.E. Code of Minimum Requirements for the Heating and Ventilation of Buildings, edition of 1929, and American Standard Drawings and Drafting Room Practice Graphical Symbols {American Standards Association, Z14.2--1935). 804 Chapter 44--Terminology 33. Joint 34. Elbow--90 deg 35. Elbow--45 deg 36. Elbow--Turned Up 37. Elbow--Turned Down 3S. Elbow--Long Radius 39. Side Outlet Elbow--Outlet Down 40. Side Outlet Elbow--Outlet Up 41. Base Elbow 42. Double Branch Elbow 43. Single Sweep Tee 44. Double Sweep Tee 45. Reducing Elbow 46. Tee 47. Tee--Outlet Up' 48. Tee--Outlet Down 49. Side Outlet Tee--Outlet Up 50. Side Outlet Tee--Outlet Down 51. Cross 805