Motor Cooling Port Specifications; Economizer Port Types - Danfoss VTT Series Applications And Installation Manual

Figure 16
Motor Cooling Path
Motor Cooling Port
Specifications
Figure 17
Motor Cooling Inlet Flange

Economizer Port Types

Page 34 of 73
M-AI-VT-001-EN Rev.C.1
Refrigerant Piping Design
To the vapor side of the evaporator
The motor cooling inlet port is factory-fitted with
an electronic expansion valve. The compressor is
shipped with a liquid inlet tube to the expansion
Revision A
VTT compressors use two-stage centrifugal
compression with inter-stage port availability.
Two types of economizer arrangements can be
Subcooled
Liquid
Electronnic Expansion Valve
To Evaporator
valve with a 10 mm (3/8") inch sweat connection
and capped to hold the helium charge.
used; sub cooler (closed) or flash tank (open), see
Figures 21 and 22. Care must be taken to ensure
only refrigerant vapor enters the compressor.
Superheated
Vapor
Revision B and later