The valve positions used in this description are defined as follows: Back-Seated – Valve stem turned all the way out (fully counterclockwise). Front-Seated – Valve…
• Typically used for penetrating refrigerant lines in equipment with hermetically-sealed compressors that have no service valves. This valve is normally bolted onto the line.…
There are specific regulations about the handling of refrigerants and their containers as a result of the Clean Air Act. These regulations require that specific…
Servicing a mechanical refrigeration system often involves recovering the refrigerant charge, making repairs, and evacuating and recharging the system. Therefore, a service technician must know…
One of the requirements mandated by the EPA is that refrigerant removed from existing systems must be captured, and when possible, reused. This requirement has…
Since November 1994, the EPA has required the certification of all technicians who service air conditioning and refrigeration equipment. This includes anyone who performs installation,…
As a result of worldwide concerns about ozone depletion and global warming, refrigerants and the people who work with them have come under increasing regulation…
another major environmental concern (Figure 3-2). Do not confuse ozone depletion with global warming. These are two entirely different environmental problems. When compared to ozone…
Ozone is found both in the Earth’s troposphere, which extends from ground level to 7 miles up, and in the stratosphere, which is 7 to…
Magnehelic® differential pressure gauges provide a direct reading of pressure and/or air velocity. These gauges are used to measure filter resistance, air velocity, and furnace…