Atlas Copco GA 110 VSD+ Instruction Book page 102

Reference
403
408
407
90
405
401
412
402
411
406
89, 90
90
413
Description air system
Compressed air enters heat exchanger (301a) and is cooled by the outgoing, cold, dried air.
Water in the incoming air starts to condense. The air then flows through heat exchanger/
evaporator (301b) where the refrigerant evaporates causing the air to be further cooled to close
to the evaporating temperature of the refrigerant. More water in the air condenses. The cold air
then flows through separator (111) where all the condensate is separated from the air.
The condensate collects in the electronic water drain (413) and is automatically drained. The
cold, dried air flows through heat exchanger (301a), where it is warmed up by the incoming air to
approx. 5 ˚C (9 ˚F) below the incoming air temperature.
Condensation in the air net cannot occur unless the air is cooled to below the pressure dew-point
indicated on the control panel.
Description refrigeration system
Refrigerant compressor (402) delivers hot, high-pressure refrigerant gas, which flows through
condenser (202), where most of the refrigerant condenses.
The liquid flows through refrigerant dryer/filter (405) to thermostatic expansion valve (407) via
sight-glass (406). The refrigerant leaves the thermostatic expansion valve at evaporating
pressure.
The refrigerant enters evaporator (301b), where it withdraws heat from the compressed air by
further evaporation at constant pressure. The heated refrigerant leaves the evaporator and is
sucked in by refrigerant compressor (402) via liquid separator (401).
The dryers are provided with a sight-glass (406). The sight-glass allows the refrigerant flow in the
line to be checked. During normal operation, the liquid flow must be clear. In general, vapor
bubbles indicate a shortage of refrigerant. Note that fluctuations in the load may cause bubbles to
pass in the flow for a short time. The centre of the glass is provided with a moisture indicator
which is green when the liquid refrigerant is free of moisture. It will turn yellow when the
100
Name
Air-cooled condenser (air-cooled version)
Water-cooled condenser (water-cooled version)
Fan blower (air-cooled version)
Water regulating valve (water-cooled version)
Thermostatic expansion valve
Pressure shut-down switch
Refrigerant dryer/filter
Liquid separator
Hot-gas by-pass valve
Refrigerant compressor
Solenoid valve
Sight-glass
Temperature sensor
Pressure sensor
Automatic drain
Instruction book
9829 3178 63