Introduction; Compressor Component Description - Sullair 4500P User Manual

2.1

INTRODUCTION

The design of the Sulliar 4500P, 5500, 7500,
4500PV, 5500V, 7500V: 60, 75 and 100hp / 45, 55
and 75kw line of compressor units is a single stage,
positive displacement, flood lubricated one. A
complete package includes the:
• Compressor unit
• Electric motor
• Starter
• Compressor inlet and discharge systems
• Compressor lubrication and cooling system
• Capacity control system
• WS Controller™
• Aftercooler
• Combination separator and trap
• Heavy gauge steel mounting frame
Some models also have a Variable Speed Drive
(VSD) that is described in Sections 2.10 and 2.11.
There are also optional components which allow
operation in environments where the compressor is
exposed to extreme temperatures, or if sea water is
used as a coolant.
New compressors are shipped from the factory fully
charged with that particular model's recommended
lubrication fluid. The SPECIFICATIONS Sections 3.4
and 3.5 describe lubrication requirements and
recommendations for each compressor package.
CAUTION
Use only one type of a recommended compressor
lubricant. Adding a different one, or mixing
lubricants can cause damage and/or
malfunctions, and will void the compressor's
warranty.
Sullair recommends that, in cases where 24KT
lubricant is used, users take a sample at the first filter
change and send it to the factory for a free analysis
using a sample kit provided by their Sullair dealer.
The results will be sent back to the user in the form of
Section 2
DESCRIPTION
4500P-7500 USER MANUAL
a report with recommendations.
NOTE
The compressor requires no internal inspections or
maintenance actions. Opening the compressor's
housing may void its warranty. (This does not apply
to the shaft seal which is replaceable.)
Although both air and water-cooled models require
no inspection of the unit's internal components,
external piping, connectors, and the enclosure
should be inspected and maintained in accordance
with the procedures and recommendations in this
manual.
2.2 COMPRESSOR
COMPONENT DESCRIPTION
Air-cooled models (Figure 2-1) use a fan to draw
outside air into the enclosure, cooling the motors, the
combined radiator fluid cooler, and air aftercooler.
This hot air is then vented out of the top of the
enclosure.
Water-cooled models (Figure 2-2) use two shell and
tube heat exchangers to transfer heat from the
coolant, and the compressed air. Both air-cooled and
water cooled models have a fluid filter, air/oil
separator, control valves, and an inlet air filter.
Fluid is injected into the compressor, and mixes
directly with the air as the rotors turn which
compresses the air. The fluid flow has three basic
functions:
1. As a coolant, it controls the air temperature
rise normally associated with the heat of
compression.
2. Seals the clearance paths between the
rotors and the stator, and also between the
two rotors.
3. Provides a lubricating film between the rotors
allowing one rotor to directly drive the other,
which is an idler.
After the air/fluid mixture is discharged from the
11