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M-SV-001-EN Rev.E
Compressor Fundamentals
Compressor operation begins with a demand
signal applied to the compressor. The startup
sequence is configurable in the startup settings.
See the OEM Programming Guide for further
details.
The compressor is a two-stage centrifugal type
compressor utilizing variable speed as the
principle means of capacity control with inlet
guide vanes (IGVs) assisting when required.
Refrigerant enters the first stage suction side
of the compressor as a low-pressure, low-
temperature, superheated vapor. It then passes
through variable IGVs that assist compressor
control at part-load conditions. Both impellers
are mounted on a common shaft. Vapor passes
through the first stage impeller where velocity
energy is added to the refrigerant. This is
converted to an intermediate pressure in the first
stage volute. Vapor then enters the second stage
impeller through a diffuser. In the second stage,
impeller velocity energy is again added to the
refrigerant and converted to the final discharge
pressure in the discharge diffuser and volute.
From the second stage impeller, refrigerant
passes as a high pressure, superheated vapor to
the system discharge line.
Liquid refrigerant, having at least 2⁰C (Kelvin)/
3.6°F (Rankine) sub-cooling at connection
point, must be piped to the compressor cooling
inlet connection. Depending on compressor
model, this connection is a 3/8 or 1/2 inch male
flare connection or a 1/2 inch O-ring face seal
connection. All connections, except the 1/2 inch
flare, have an built-in strainer. Refer to Figure
14 (Cooling Inlet Adapters) for examples of the
cooling inlet adapters.
2.1 Main Fluid Path
2.2 Motor and Power
Electronics Cooling
Figure 13 - Compressor Fluid
Paths
Table 3 - Compressor Fluid
Paths
No.
Component
No.
Component
1
Low Pressure/Low Temperature Gas
6
High-Pressure/High-Temperature Gas
2
Inlet Guide Vanes (IGVs)
7
Second-Stage Impeller
3
First-Stage Impeller
8
Vaned Diffuser
4
Volute Assembly
9
Vaneless Diffuser
5
Discharge Port
10
De-Swirl Vanes
Summary of Contents for Turbocor TG230
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