34
AdaptaPAK® Installation
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Defrost Differential — on Hillphoenix systems, located on hot gas racks
Filter and Filter/Driers
Filters are used to protect components in refrigeration systems from contaminants and other foreign material that
accumulate in the system. A particular type of filter, called a filter/dryer, also removes moisture from the system.
Three main types of filters used for refrigeration systems are:
•
Liquid Line Driers
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Suction Filters
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Oil Filters
Assorted Hardware and Other Installation Items
A number of various other types of hardware and other items are usually needed for any installation. These include,
but are not limited to:
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Refrigerant and oil
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Pipe supports and fittings
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Strainers
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Flexible line
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Heating tape
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Pipe and conduit penetration covers
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Access fittings
Refrigerant and Oil
Every refrigeration system is designed to operate a specific refrigerant and type of oil. During installation, the proper
refrigerant and oil must be added to the system. The refrigerants primarily used in commercial refrigeration are
classified into three main groups:
•
CFC – chlorofluorocarbons (R-11 and R-12)
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HCFC – hydrochlorofluorocarbons (HCFCs R-22 and R-124)
•
HFC – hydrofluorocarbons (HFCs R-134a, R-404a and R-507, R-407a, R-448/449)
Because of their harmful effects on the environment, CFC refrigerants have been phased out andsome HFC
refrigerants are being phased out.
Most AdaptaPAK® units today use HFC type refrigerants, such as R-407a or R-448/449.
Refrigeration systems, like many other kinds of machinery with moving parts, use oil for lubrication. The movement
of metal against metal generates friction (a form of heat), and friction in turn impedes the movement of those parts.
By continuously coating the metal surfaces of the moving parts in the system, oil acts to reduce friction. Lubrication
oil is essential to the operation of most compressors and other moving parts in refrigeration systems.
In refrigeration systems, the refrigerant and lubricating oil mix together. The oil dissolves in the refrigerant at most
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