Page
33
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73
M-AI-VT-001-EN Rev.C.1
DISCHARGE FLANGE
MOTOR COOLING EXIT PORT
ECONOMIZER PORT
SUCTION FLANGE
MOTOR COOLING INLET FITTING
Refrigerant Piping Design
Refrigerant Piping
Connections
Figure 15
Mechanical Connections
Figure 15 shows the mechanical connections on
the VTT compressor.
Table 15
Mechanical Connections
Interface
Size
Suction Flange
ANSI B16.5 Class 300, 150 mm (6") Pipe
Discharge Flange
ANSI B16.5 Class 300, 100 mm (4") Pipe
Economizer Port Flange
ANSI B16.5 Class 300, 32 mm (1 1/4") Rev A&B 41mm (1 5/8”) Rev C
Face Seal Flange
Economizer line size: 41 mm (1 5/8") copper tube
Motor Cooling Exit Flange
Face Seal Flange
Motor Cooling Exit Line size 29 mm (1 1/8") copper tube
Motor Cooling Inlet Connection
Face Seal, fitted with Expansion Valve O-ring faced male threaded
connection
Motor Cooling
Connections
To cool the motor, sub-cooled liquid refrigerant
enters the compressor through the expansion
valve and passes through grooves surrounding
the motor stator. At the coil outlet, the
superheated refrigerant gas is channeled back
to the exit port via the motor cavity, thereby
cooling the rotor.
The temperature sensor located inside the end
cap measures gas temperature prior to entering
the motor cavity and determines the superheat
level; the expansion valve modulates to maintain
this pre-determined superheat level.
