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M-SV-001-EN Rev. G
Figure 2-2 Cooling Inlet Adapter
Liquid refrigerant is internally channeled to two (2) solenoid valves. These valves have integral orifices
that act as expansion devices to cool the compressor motor, shaft (rotor) and power electronics.
TTS300 and TGS230 compressors have these solenoids arranged so that all components are cooled
in series with each other and the solenoids act as two stages of cooling capacity. The TTS350, TTS400,
TTS500, TTS700, TTH375, TGS310, TGS390, TGS490, TGS520, TTH375, and TGH285 compressors have
separate cooling paths for motor and power electronics. These cooling methods are identified as serial
or split cooling.
Serial cooling has its return point to the inlet of the first stage impeller, thus cooling all components
with refrigerant evaporating at the saturated suction temperature. In serial cooling versions, Solenoid
1 is opened if any temperature reaches its “turn on” point and Solenoid 2 is opened if any temperature
reaches a second “turn on” point value. Refer to cooling circuit diagram "Figure 2-5 Serial Cooling Path
- TTS300/TGS230" on page 34.
The split cooling has the motor/shaft cooling circuit return to the first stage impeller inlet and
the power electronics return to the second stage impeller inlet. This ensures a higher evaporating
(cooling) temperature to minimize condensation around the power electronic components. In the
split cooling version, Solenoid 1 is opened if either the cavity temperature or the motor temperature
reaches its “turn on” point and Solenoid 2 is opened if the Inverter or SCR temperature reaches its “turn
on” point. Refer to cooling circuit diagram "Figure 2-4 Split Cooling Path - (TTS/TGS (Except TTS300/
TGS230 Serial Cooling)" and "Figure 2-3 Split Cooling Path - TTH375/TGH285" on page 33.
Medium temperature (MT) version compressors require their motor cooling suction line to be vented
externally to the main suction line through an evaporator pressure regulating (EPR) valve. This valve
is required to ensure that evaporating temperatures cooling the motor and electronics do not get
too cold. The EPR valve should be adjusted to maintain a minimum evaporation temperature of 1.5°C
(35°F). Refer to the Applications and Installation Manual for further details.
Serial Cooling compressors can be identified by having only one 1/4 inch flare Schrader connection
adjacent to the main motor cooling liquid connection, while a split cooling model will have two. These
1/4 inch flare connections access the refrigerant feeds to the components being cooled and bypass
the solenoid valves. These ports may be used to inject liquid refrigerant directly to cool components
and enable compressors to operate during system charging operations. A minimum pressure ratio
of 1.5 and a full liquid seal at the compressor is required to ensure proper and correct compressor
cooling.
1/2" ORFS connection with strainer
Summary of Contents for Turbocor TTS Series
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