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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" on page 67 and
"Figure 14-4 Typical Refrigeration Piping Schematic With Closed Type Economizer" on page 68.
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.
NOTE
To prevent reverse rotation and potential bypass of gas through an idle compressor the economizer circuit must be isolated with
an automatically actuated valve which closes immediately upon compressor shut down.
NOTE
Economizer installation is mandatory for both the TTH and TGH compressors.
13.3 Motor/Electronics Cooling Requirements
NOTE
• S
ub-cooled liquid must be fed to the motor/electronics cooling port of the compressor.
• 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.
It is essential that compressor motor and power electronics cooling is available immediately at start
up. The compressor motor cooling liquid feed line must be configured and located so this occurs.
Recommended minimum pipe size is 1/2” for all models. A larger size may be necessary in some
Summary of Contents for TGH Series
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