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Diagnostic Chain
FILTERS, FILTER/DRIERS OR CATCH-ALL©:

picture of filter drier ¹
This is the way a two way flow filter/drier works.  This one is for use 
in a heat pump application with the capability of refrigerant flow in either 
direction.  

In other applications (non heat pump) the drier will be directional.  
An arrow will indicate the direction on the side of the drier and must be 
placed in the direction of the refrigerant flow.  It will point away from 
the condensing unit and toward the evaporator coils if it is a liquid line 
drier. If it is a suction line drier it will point away from the evaporator 
coils and toward the condenser.

If it becomes filled with debris, contaminants or non-condensables, it 
will restrict the flow of refrigerant through it.  The outlet end of 
the drier will be cooler than the inlet if it is restrictive.  

The drier may have an access port where you can measure the pressure 
drop with your gauge. If it is restrictive, remove it from the system 
and replace it with a new one of the appropriate tubing connections.

		diagram of the installation of drier in system

Filter/driers are rated in cubic inches of filtering ability.  Use 
larger sizes if more cleanup ability is needed. They will catch the 
moisture, acid, solid contaminants and varnish from oil breakdown, etc. 
that are within the flowing refrigerant.

Make sure the filter is installed in the correct location.  Suction line 
filter/driers and suction filters should be installed as close to the 
compressor as possible.  If a vibration eliminator is used, the drier 
or filter should be installed upstream of it.  Filter/driers may be 
installed either in a horizontal or vertical position.  

If the vertical position is used, the flow should be downward to prevent 
oil trapping.  Always install the unit with the flow direction as specified 
on the product label.

The filter/driers are dehydrated and sealed.  Do not remove the seals until 
ready for installation to prevent moisture pickup from the atmosphere. When 
a need exists, a suction line filter/drier can be used on a liquid line 
application.  The construction of both types is similar, except the suction 
line filter/drier has larger connections and an access valve.  

The performance characteristics of the two drier types are similar.

All of the above information and more is available from printed materials 
and an extremely good web site supplied by: Sporlan
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