Atlas Copco GA90C Instruction Book

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Instruction book
h Safety valve (SV) leaking.
h Have valve replaced.
i Compressor element (E) out of order.
i Consult Atlas Copco.
5 Excessive oil flow through air inlet filter after stopping.
a Check valve (CV) leaking or oil stop valve (Vs) jammed.
a Have defective parts replaced. Replace air filter element
(AF).
6 Safety valve (SV) blows after loading.
a Inlet valve (IV) malfunctioning.
a See 1b.
b Minimum pressure valve (Vp) malfunctioning.
b See 1d.
c Oil separator element (OS) clogged.
c See 4f.
d Safety valve (SV) out of order.
d See 4h.
e Dryer piping clogged because of ice formation.
e Have refrigerant system checked by Atlas Copco.
7 Element outlet 1) or air outlet temperature above
normal.
a Insufficient cooling air or cooling air temperature too high.
a Check for cooling air restriction or improve ventilation of
compressor room. Avoid recirculation of cooling air. If
installed, check capacity of compressor room fan. On water-
cooled compressors, check cooling water flow; if necessary,
have system cleaned.
b Oil level too low.
b Check and correct as necessary.
c Oil cooler (Co) clogged.
c Clean cooler.
d By-pass valve (BV) malfunctioning.
d Have valve tested.
e Air cooler (Ca) clogged.
e Clean cooler.
f Compressor element (E) out of order.
f See 4i.
Footnotes chapter 6
1) A warning message will appear on display (4-Fig. 1.9).
7 Principal data
7.1 Readings on display (4-Fig. 1.9) 8)
Ref. Air outlet pressure
Reading: Modulates between programmed unloading and
loading pressures
Shown: On main display (Fig. 1.10)
Sensor: PT20-Fig. 1.6
Ref. Compressor element outlet temperature
Reading: Approx. 60 degrees celsius above cooling air
temperature or above cooling water inlet
temperature
Shown: When using the key <<More>> (5-Fig. 1.9) 9)
Sensor: TT11-Fig. 1.6
Ref. Pressure difference over oil separator
Reading: Below 1 bar
Shown: When using the key <<More>> (5-Fig. 1.9) 9)
Sensor: PDT1-Fig. 1.6
Ref. Cooling water outlet temperature
Reading: Below 50 degrees celsius
Shown: When using the key <<More>> (5-Fig. 1.9) 9)
Sensor: TT51
7.2 Settings of safety valve
Compressor type Safety valve set
pressure(e)
GA 7.5-8 bar. . . . . . . . . . . . . . . . . . . . . . . . . 12 bar(e)
GA 10 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 bar(e)
GA 13 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5 bar(e)
GA 100 psi . . . . . . . . . . . . . . . . . . . . . . . . . . 200 psig
GA 125 psi . . . . . . . . . . . . . . . . . . . . . . . . . . 200 psig
GA 150 psi . . . . . . . . . . . . . . . . . . . . . . . . . . 200 psig
GA 175 psi . . . . . . . . . . . . . . . . . . . . . . . . . . 215 psig
GA 7.5-8 bar/ISPESL approved . . . . . . . . . 11 bar(e)
GA 10 bar/ISPESL approved . . . . . . . . . . . . 11 bar(e)
GA 13 bar/ISPESL approved . . . . . . . . . . . . 14 bar(e)
Always check the set pressure stamped on the valve.

Atlas Copco GA90C Specifications

General

Brand	Atlas Copco
Model	GA90C
Category	Air Compressor
Language	English