Refrigerant Piping Design; Refrigerant Piping Connections; Motor Cooling Connections - Danfoss VTT Series Applications And Installation Manual

Refrigerant Piping
Connections
Figure 15
Mechanical Connections
SUCTION FLANGE
ECONOMIZER PORT
Table 15
Mechanical Connections
Motor Cooling
Connections

Refrigerant Piping Design

Figure 15 shows the mechanical connections on
the VTT compressor.
MOTOR COOLING INLET FITTING
Interface
Suction Flange
Discharge Flange
Economizer Port Flange
Motor Cooling Exit Flange
Motor Cooling Inlet Connection
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.
DISCHARGE FLANGE
MOTOR COOLING EXIT PORT
ANSI B16.5 Class 300, 150 mm (6") Pipe
ANSI B16.5 Class 300, 100 mm (4") Pipe
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
Face Seal Flange
Motor Cooling Exit Line size 29 mm (1 1/8") copper tube
Face Seal, fitted with Expansion Valve O-ring faced male threaded
connection
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.
M-AI-VT-001-EN Rev.C.1
Size
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