Sullivan-Palatek UD Series User Manual Download

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COMPONENT DESCRIPTION

3.6.5

FLUID LEVEL SIGHT GLASS AND FILL

The fluid level sight glass and fill allows visual monitoring of the oil level in the sump tank and is the port

through which oil is added. The fluid level sight glass and fill is supplied with a

vented cap and is located on

the side of the sump tank behind the end

access panel door (if enclosed).

3.6.6

SUMP TANK DRAIN VALVE

The sump tank drain valve allows oil to be drained from the sump tank when performing annual maintenance.

This ball valve is located under the sump tank, and a 1/2-inch NPT port is conveniently mounted to the frame,

so that a tube or pipe can be connected for easy draining.

3.6.7

WATER SEPARATOR WITH ELECTRIC DRAIN

(OPTIONAL)

The water separator removes condensed moisture from the compressed air after it is cooled in the

aftercooler. The separator is equipped with a condensate drain controlled by an electric solenoid which has
an adjustable timer range that can be changed based on seasonal requirements.

3.7

COOLING AND LUbRICATING SYSTEM

The compressor oil is circulated through the package due to differential pressure between the sump tank and

the compressor unit. Oil flows from the sump tank to the temperature control valve where cool oil is initially
allowed to bypass the oil cooler, injecting directly into the compressor unit. As the temperature of the oil
rises, the temperature control valve begins to redirect the oil to the oil cooler. Once the oil temperature
matches or exceeds the temperature control valve’s set point, all of the oil will be delivered to the oil cooler.

In the oil cooler, heat from the oil is transferred to the cooler fins. Airflow produced by the electric-driven
cooling fan removes the heat from the oil cooler. Cool oil then flows through the oil filter where particulate is
removed before entering the compressor unit. Oil in the compressor unit lubricates the internal components,

cools the compressor unit by absorbing the heat of compression, and seals the compressor unit’s internal

clearances.

3.7.1

LUBRICANT

The compressor lubricant is also referred to as compressor fluid or simply as oil. During the compression

cycle, lubricant is injected directly into the compressor unit. The lubricant in a rotary screw compressor

serves three primary functions:

It is a lubricant, supplying constant flow between the moving parts along with the bearings and seals.

It is a coolant, removing the generated heat of compression during operation. The controlled

temperature rise across the unit will be around 40

°F.

It is a sealant, sealing the rotors to reduce leakage paths between the rotors and between the stator

housing.

Rotary screw compressor units require specialized lubricant to maintain proper performance. Use of

Sullivan-Palatek

lubricants is recommended. Refer to

6.5 Compressor Lubricant on page 36

for more

information.

3.7.2 TEMPERATURE CONTROL VALVE (THERMOSTATIC VALVE)

The temperature control valve (also referred to as a thermostatic valve) regulates the flow of oil to the oil

cooler based on temperature. When the compressor is first started the valve allows cool oil to bypass the
oil cooler. As the oil temperature rises the valve gradually redirects the hot oil through the oil cooler. The

temperature control valve is mounted to the side of the oil cooler

3.7.3 FLUID (OIL) COOLER

The fluid (oil) cooler is a two-pass, finned aluminum tube design. The fluid (oil) cooler allows transfer of heat

from the oil through the tube wall and into the fins. The heat is then removed by the airflow from the

motor-

driven

cooling fan. The cooling assembly is located

at the end of the compressor package and exhausts

upward

3.7.4

COOLING FAN AND MOTOR

The cooling fan and motor produce airflow through the fluid/air cooler to remove heat.

The cooling fan is

a standard blade design.

The fan is attached to the

non-drive end shaft of the main drive motor within a

shroud.

3.7.5 FLUID (OIL) FILTER

The fluid (oil) filter removes particulate from the oil prior to entering the compressor unit. The fluid (oil) filter

is a full-flow, spin-on type element made of microglass media. It is mounted directly to the compressor unit
with the elements on top so that any remaining fluid drains out at time of maintenance.