AIRTAK SD-10 through SD-250 Manuale di istruzioni per l'uso - Pagina 5

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AIR & REFRIGERANT CIRCUITS:

Air Circuit

Warm wet compressed air enters the refrigerant dryer at the inlet port. (On models 30

scfm through 250 scfm) It first passes through an air-to-air heat exchanger where its

temperature is lowered by the cool air exiting the dryer. It then enters the evaporator or

refrigerant-to-air heat exchanger where its temperature is lowered. The condensate

(water) generated by the cooling action is collected in the moisture separator and

automatically removed. The dry air then leaves the separator, and enters the air to air

heat exchanger (30 scfm through 250 scfm models only) where it is heated and the air

exits through outlet port.

Refrigerant Circuit

The refrigerant compressor compresses refrigerant vapor to a high pressure and

temperature. The compressed vapor then flows through the condenser where it is

cooled and forms a liquid. After this, it is filtered through the refrigerant filter-dryer

where any traces of moisture and contaminants are removed. The expansion valve

lowers the pressure which in turn lowers the temperature of the liquid refrigerant to its

preset level. It remains at this pressure and vaporizes as it flows through the

evaporator/refrigerant-to-air heat exchanger absorbing heat from the air being dried.

The refrigerant then flows back to the compressor and the cycle repeats.

The dryer uses R134a refrigerant. For units with a refrigerant suction pressure gauge,

the refrigerant suction pressure is listed in chart below for the appropriate model. If a

lower pressure dew point is required, back off the adjustment screw on the expansion

valve until gauge pressure reaches the desired level.

Model Number

SD10 through SD20

SD30 through SD40

SD50 through SD100

SD150 through SD250

Gauge Pressure Reading

33 to 38 psig

29 to 33 psig

30 to 34 psig

31 to 35 psig