Danfoss Turbocor TTS Series Applications And Installation Manual page 89

Figure 14-9 TTH/TGH Piping Schematic with Required Economizer (Closed Type) and Vapor Line Solenoid
Failure to include a solenoid valve in the compressor VAPOR line, wired to close immediately when the compressor shuts down, could
result in serious damage to the compressor.
All TGH/TTH compressors MUST include an active economizer (flash or plate style) when operated at pressure ratios above 2.0. If an
economizer is not active at pressure ratios above 2.0, significant instability should be expected and the operating range of the compressor
will not meet rated expectations. Economizer should be deactivated below PR 2.0
* Service valves are optional
NOTE
NOTE
NOTE
M-AP-001-EN Rev. S-9/8/2021 Page 89 of 136