Several safety devices protect the compressor in abnormal situations. For instance, the high pressure switch interrupts the compressor control circuit when the refrigerant high-side pressure…
Category: Air Conditioning
Rooftop heating and cooling units are made by many manufacturers. Some units are delivered with a full refrigerant charge. This means there are no refrigerant…
A 2- to 5-ton packaged unit is available from several manufacturers. Lennox makes a self-contained unit that can be mounted on a slab or on…
An expansion-valve kit has been developed to match the evaporator unit. The expansion valve is equipped with a bleed port. This permits pressures to equalize…
This type of condensing unit can be installed in singles or multiples. Such units are used in residential, apartment, motel, and commercial applications. These units…
Another type of air-conditioning equipment is the wall mounted unit. This type of unit requires no ductwork and has a wireless remote controller. The compressor…
Some units are now available for mobile home installations. See Fig. 15-28. Such a unit will furnish from 2 to 4 tons of cooling. The…
The importance of suction-line design and sizing cannot be overemphasized. Lubricating oil does not mix well with the cold refrigerant vapor leaving the evaporator(s). It…
Liquid-line sizing presents less of a problem than suction line sizing for the following reasons: • The smaller liquid-line piping is much cheaper than suction-line…
Volume dampers are important to a good system design. Lengths of supply runs vary and usually have the same cubic-foot measurements. Therefore, balancing dampers should…