Emerson VSSG, VSG manual Operation, Close discharge bleed valve while still purging

Section 4 • Operation

NOTE

Purging is performed through the suction oil charging valve so that trapped gas can be pushed out of the compressor. This will help minimize metal surface oxidation of the compressor (due to the gas) while not in service.

9.Purge compressor unit for 5 minutes. Check dis- charge pressure on PLC main screen to make sure pressure is increasing.

10.Close discharge bleed valve while still purging.

11.Observe discharge pressure through the PLC main screen. Allow pressure to build to approximately 10 psig.

12.Once pressure is reached, stop purging and close suction oil charging valve. If pressure is greater than 10 psig, crack open discharge bleed valve, as needed, to slowly bleed the system to approxi- mately 10 psig.

13.Wait 10 minutes to make sure there are no leaks and that the pressure is holding.

14.Remove purging hose from suction oil charging valve.

View Rotate 180°

Equalizing Solenoid for Suction Bypass

Suction Bypass Valve

(Manual)

Figure 4-8. Suction Bypass Valve and Equalizing Solenoid

Suction Oil

Charging Valve

Discharge

Bleed Valve

View Rotate 180°

Figure 4-9. Suction Oil Charging Valve and Discharge Bleed Valve

4 – 10 VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG