Emerson VSSG, VSG manual Coalescing Oil Return Line Setup, Operation

Section 4 • Operation

Coalescing Oil Return Line Setup

Over time, oil will accumulate on the coalescing side of the oil separator. As a result, an oil return line with a shut-off valve, sight-glass, check valve and needle valve are installed between the coalescing side and compres- sor to return this oil back to the compressor.

To adjust the return flow, proceed with the follow procedure:

NOTE

Do not fully open the needle valve unless directed by Vilter Customer Service. Leaving the needle valve fully open will reduce efficiency of the compressor unit.

1.Open shut-off valve on coalescing side of oil separa- tor, see Figure 4-14.

2.While the unit is in operation, crack open needle valve and observe oil flow through sight-glass.

3.Slowly open needle valve more until a small amount of oil is seen in the sight-glass.

NOTE

The sight-glass should never be full with oil.

4.Periodically check oil in the sight-glass and ensure that there is flow.

Needle

Valve

Coalescing Oil Return Line

Figure 4-14. Coalescing Oil Return Line

Check Valve

Sight-Glass

Shut-Off

Valve

4 – 14 VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG