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System Protectors

Emerson Climate Technologies

Typical drier

Solid Contamination Captured

Flow Restriction

The lter driers for use in HFC and POE oil systems

must keep the system dry and free of any acids gener-

ated. However, since water capacity is of primary im-

portance the lter drier should contain a higher percent-

age of molecular sieve than was required for CFC and

HCFC systems. But molecular sieve alone is not enough

since it has almost no organic acid capacity. An organic

acid removal desiccant must be used such as activated

alumina to ensure low acid levels are maintained. The

lter drier should also have higher ltration capacity

and efciency. The EK series of lter driers provides the

best combination of these properties to ensure the long,

trouble-free life of any air-conditioning or refrigeration

system.

The moisture indicating sightglass must also indicate

moisture levels less than 50 ppm moisture. Also, it must

be able to perform this function at the temperature of the

liquid line on which it is placed. Many sightglasses can-

not perform this function at all liquid line temperatures.

This low level indication ability is needed to ensure that

the system moisture never exceeds the level at which

organic acid formation starts. The Emerson HMI mois-

ture indicating sightglass provides this low level detec-

tion ability.

Figure 4

Filtration Capability of Filter driers

Emerson ASD suction line lter drier

Such protection is encouraged by compressor manu-

facturers in any case, but there are two circumstances

that make suction line lters or lter driers advisable:

1) It is practically impossible to avoid contamination

when assembling a refrigeration system in the eld.

Dirt, moisture, metal particles, and copper oxide

from brazing all can be present in the system de

spite the greatest care, and all can damage or

reduce the service life of the compressor.

2) In large and complex systems, such as a single

system serving several food cases throughout a

supermarket, it is a generally accepted practice to

install a cartridge-type lter in the suction line. Then,

because of the virtual certainty of contamination

during assembly of the system, the initial cartridge is

removed and replaced after the rst few days of

system operation.

When considering the price of a compressor, the cost

of protecting it with a suction line lter is insignicant.

Suction Filter Driers

The function of lter driers in refrigeration and air

conditioning systems is to trap moisture and harmful

contaminants. But their use in the liquid line still tends

to be thought of as the “standard” application; including

them also in the suction line hasn’t yet become stan-

dard practice to the same degree.

A lter drier in the liquid line essentially protects the

system controls – solenoid valves, expansion valves,

and pressure regulators. The function of the lter or

lter drier in the suction line is specically to protect the

compressor against contaminants.

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