Figure 13-1 Discharge Cone to Illustrate the Piping Requirements
13.2 Economizer Option
Turbocor compressors use two stage centrifugal compression with interstage port availability. This feature provides
advantages of capacity and efficiency improvement when an economizer is installed. The improvements in
efficiency and capacity are a result of further sub-cooling of the liquid refrigerant. Two types of economizer
arrangements can be used: sub-cooler or flash tank. Refer to Figure 14-3 Typical Refrigeration Piping Schematic with
Flash Tank Economizer and Figure 14-4 Typical Refrigeration Piping Schematic with Closed Type Economizer.
Refrigerant must enter the compressor through the economizer port in a “gas” state. Care must be taken to ensure
that no liquid enters the compressor.
To determine compressor capacity and efficiency, the economizer performance rating option is available in the
Selection Software on the TT/TG Software Section of the Danfoss LLC web page (www. turbocoroem.com). The
circuit must be properly designed to reflect the specified heat exchanger approach with minimized pressure drops
across the liquid side and expansion side. Piping design, including expansion device selection and pipe sizing,
should be in accordance with best practices.
• • • CAUTION • • •
To prevent bypass of gas through an idle compressor the economizer refrigerant circuit should include an automatically actuated valve
which closes upon compressor shutdown.
• • • CAUTION • • •
All TTH and TGH compressors must have an economizer which is active above 2.0 Pressure Ratio and to prevent reverse rotation, a
normally closed solenoid valve installed in the interstage vapor line which must close immediately upon compressor shut down.
13.3 Motor/Electronics Cooling Requirements
NOTE
l Sub-cooled liquid must be fed to the motor/electronics cooling port of the compressor
l It must be in a pure liquid state with a minimum of 6°F (3.5°C) sub cooled at the connection point to the motor/electronics
cooling port of the compressor
NOTE
Filter dryer, sight glass and service valve must be fitted in the motor-cooling liquid line.
Page 76 of 136 - M-AP-001-EN Rev. S 9/8/2021
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