conversations.from: human
conversations.value: Do you know a description for a book titled HVAC Troubleshooting Guide about Ed.D, Emeritus, Professor with the genre: Crafts, Hobbies & Home, Home Improvement & Design?
conversations.from: assistant
conversations.value: the author, Ed.D., is Emeritus Professor at the State University of New York at Buffalo.
conversations.from: human
conversations.value: Do you know the first five paragraphs for this book?
conversations.from: assistant
conversations.value: HVAC Troubleshooting Guide
  Several regulations have been issued under Section 608 of the Clean Air Act to govern the recycling of refrigerants in stationary systems and to end the practice of venting refrigerants to the air. These regulations also govern the handling of halon fire extinguishing agents. A Web site and both the regulations themselves and fact sheets are available from the EPA Stratospheric Ozone Hotline at 1-800-296-1996.
  NOTE: The handling and recycling of refrigerants used in motor vehicle air-conditioning systems are governed under Section 609 of the Clean Air Act.
  The leak repair requirements, promulgated under Section 608 of the Clean Air Act Amendments of 1990, require that when an owner or operator of an appliance that normally contains a refrigerant charge of more than 50 lb discovers that refrigerant is leaking at a rate that would exceed the applicable trigger rate during a 12-month period, the owner or operator must take corrective action.
  For all appliances that have a refrigerant charge of more than 50 lb, the following leak rates for a 12-month period are applicable (Table 5-12):
  In general, owners or operators must either repair leaks within 30 days from the date the leak was discovered, or develop a dated retrofit/retirement plan within 30 days and complete actions under that plan within 1 year from the plan's date. However, for industrial process refrigeration equipment and some federally owned chillers, additional time may be available.
conversations.from: human
conversations.value: Do you know two more paragraphs?
conversations.from: assistant
conversations.value: Compressor service valves are back-seating. They are constructed so that the stem forms a seal against a seat whether the stem is full-forward or full-backward. Valve packing is depended upon only when the stem is in the intermediate position. In one style of construction, the front seat including the one connection is threaded. Silver is brazed into the body after the stem has been assembled. When the valve is full-open (normal position when the unit is running) the gage and charging port plug or cap may be removed without loss of refrigerant. A charging line or pressure gage may be attached to this side port. It is also possible to repack the valve without interruption of service.
  Line valves are essential components of refrigerant systems (see Fig. 11-10). Installed in key locations, line valves make it possible to isolate any portion of a system or, in a multiple hookup, to separate one system from the rest. Local codes frequently specify the location of line valves in commercial- and industrial-refrigeration and air-conditioning systems. There are two types of line valves:
conversations.from: human
conversations.value: Do you know the last five paragraphs?
conversations.from: assistant
conversations.value: The standard method of showing switches is in a position with no operating force applied. For switches that may be in any one of two or more positions with no operating force applied and for switches actuated by some mechanical device (as in air-pressure, liquid-level, rate-of flow, and so forth, switches), a clarifying note may be necessary to explain the point at which the switch functions.
  The elements of the symbol must be drawn in such an order as to show clearly the operating function of the device. Electron flow is in the opposite direction.
  If necessary, a special function or property essential for circuit operation shall be indicated by a supplementary symbol included as part of the symbol.
  Thyristor, reverse-blocking triode-type, N-type gate; semiconductor-controlled rectifier, N-type gate
conversations.from: human
conversations.value: Add another sentence about easy, indicated, noted.
conversations.from: assistant
conversations.value: The standard method of showing switches is in a position with no operating force applied. For switches that may be in any one of two or more positions with no operating force applied and for switches actuated by some mechanical device (as in air-pressure, liquid-level, rate-of flow, and so forth, switches), a clarifying note may be necessary to explain the point at which the switch functions. 
  The elements of the symbol must be drawn in such an order as to show clearly the operating function of the device. 
  The triangle points in the direction of the forward (easy) current as indicated by a direct current ammeter, unless otherwise noted adjacent to the symbol. Electron flow is in the opposite direction. 
  If necessary, a special function or property essential for circuit operation shall be indicated by a supplementary symbol included as part of the symbol. 
  Thyristor, reverse-blocking triode-type, N-type gate; semiconductor-controlled rectifier, N-type gate