Emerson VSR, VSM, VSS service manual Operation, Oil Separator Bleed Line

Operation

3. Suction Pressure

Low suction pressure cutout stops the compres- sor unit when the suction pressure drops below the setpoint.

4. Oil Filter Differential

High oil filter differential cutout stops the com- pressor unit when the difference between the outlet and inlet of the filter exceeds the setpoint.

5. Oil Temperature

The oil temperature cutout stops the compres- sor unit when the oil temperature is too high or too low.

6. Discharge Temperature

The high discharge temperature cutout stops the compressor unit when the discharge tem- perature exceeds the setpoint.

INITIAL START-UP

A. Setting of Controls

(Refer to the appropriate microprocessor manual for a list of initial settings.)

B. Valve Settings

1.The suction line uses separate stop and check valves. Ensure the suction stop valve is open prior to starting.

2.The ¼” suction equalization valve should be closed during operation. The valve enables the unit to slowly equalize to low side pressure dur- ing off periods. This valve must be adjusted to minimize oil loss when compressor stops.

3.The discharge line uses separate stop and check valves. Ensure the discharge valve is open prior to starting.

4.Manually open the oil isolating valve at the oil separator outlet connection.

5.Open the isolating valve(s) before and after the oil filter housings.

6.Manually open the stop valve on the oil bleed return line from the element section and open the expansion valve 1/2 of a turn.

STRAINER

CHECK

VALVE

TO COMPRESSOR

SG

SIGHT	HAND EXPANSION
GLASS	VALVE

FIGURE 6.

OIL SEPARATOR BLEED LINE

NOTE:

The purpose of the oil bleed return assembly is to collect any oil that passes through the oil separat- ing element and returns that oil to the compres- sor. The hand expansion valve should be adjusted to prevent an oil level from forming in the sight glass when the compressor is at 100% capacity. Generally 1/2 to 1 turn open is satisfactory.

7.Open 1/4” high pressure gas line valve piped to oil injection line just enough to quiet compres- sor at 100% capacity.

C. Compressor Pre Start-Up Check List

Before proceeding with actual starting of the compressor, the items listed on the “Pre Start-Up Check List” must be verified. Time and money will be saved before the Vilter start-up technician ar- rives. (See next page.)

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