Emerson VSM, VSR, VSS service manual Operation

Operation

Wet the O-ring in the new element with clean refrigeration oil. Insert the new element into the filter tank with the closed end visible and attach the cover to the bowl. HAND TIGHTEN the cover.

The filter housing can be evacuated and then slowly pressurized to check for leaks before re- turning to service.

4.Filter Removal, VSS and VSM Units (after 5/1/00) when using Vilter Part Numbers 3109A (16” Duplex), or 3110A (39” Du plex) oil filter housings.

Isolate the bowl to be worked on by turning handle. The handle will cover the drain valve of active element. Close commuter valve in center of handle. Release the pressure in the isolated bowl by bleeding through the stop valve on the oil filter cover for Duplex (Vilter Part #3109A or 3110A), or through the stop valve for the oil filter hous- ing. Be sure to follow all Local, State and Federal ordinances regarding the recovery of refrigerants.

Drain the filter bowl or housing in to an appro- priate container and dispose of the oil in a ap- propriate manner following all Local, State and Federal ordinances regarding the disposal of used refrigeration oil.

Loosen and remove the cover on the bowl of the filter tank by turning it in a counter clockwise direction. Remove the used element.

Wet the O-ring in the new element with clean refrigeration oil. Insert the new element into the filter tank with the close end visible and attach the cover to the bowl. HAND TIGHTEN the cover.

The filter housing can be evacuated and then slowly pressurized by opening the commuter valve on handle. This will pressurize the housing. Check for leaks. The filter can now be returned to service. Repeat for other filter bowl if needed.

CAUTION

When changing filter, discard clogged filter only. Save and reuse spring plate and centering piece. This filter MUST be installed with the spring plate. A compressor that is allowed to operate without the spring plate is running with unfiltered oil.

The filter housing can be evacuated and then slowly pressurized to check for leaks before returning to service.

D. Oil Pressure Regulating

On units with a full time oil pump, the back pres- sure regulator, in the oil supply line from the sepa- rator, controls upstream pressure to the compres- sor bearings and should be adjusted to hold the oil pressure at 50 psig above suction pressure. Excess oil not required for bearing lubrication is passed through the regulator and flows into the separator.

E. Oil Cooling

1. Water Cooled Oil Cooler

In lieu of the three way oil temperature valve to control the temperature of the oil used for lubrication and cooling of the compressor, it is required to install a water regulating valve and solenoid valve combination to control the water supply to the oil cooler. The water inlet connec- tion should be made on the bottom and the outlet connection on the top. The water supply is controlled by the water regulating valve to maintain the oil temperature at approximately 120°F.

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