Danfoss Turbocor VTT Series, Service Manual, Page: 13 / 165

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M-SV-VT-001-EN Rev. A
This section provides a brief introduction to the Service Manual including the Purpose, Organization,
Document Conventions used, Safety Information, and the DTC Quality Policy.
Introduction
1.1 Purpose
This Service Manual is intended to provide service procedures specific to the Danfoss Turbocor
Variable Twin Turbo (VTT) compressors. It is not intended to teach basic fundamental safety,
refrigeration, electrical or fitting skills. It is assumed persons using this manual will be appropriately
certified and have detailed knowledge, experience, and skills in respect to working with high-pressure
refrigerants and medium voltage electrical components to 1 Kilovolt (kV) high-power alternating
current (AC) and direct current (DC).
Some potential safety situations may not be foreseen or covered in this manual. DTC expects
personnel using this manual and working on Danfoss Turbocor compressors to be familiar with, and
carry out, all safe work practices necessary to ensure safety for personnel and equipment.
The purpose of this manual is to provide:
• A general description of the compressor design
• A functional description of the various components of the compressor
• Information regarding procedures necessary to detect the source of a problem within the
compressor
• The procedures for disassembling and assembling various components of the compressor
• Fault and calibration interpretations
• System troubleshooting suggestions
• Maintenance tasks that should be followed
This manual gives only general procedures for servicing and does not provide part numbers of single
products or single components. If this information is required, please contact a recognized Danfoss
Turbocor original equipment manufacturer (OEM) customer.
1.2 Organization
This manual is organized in the following manner:
•
Section 1: Introduction
– this section describes the purpose of the manual, its organization,
conventions used in the manual, and a safety summary which describes the use of Danger,
Caution, and Notes symbols
• Section 2: Compressor Fundamentals – this section identifies the parts of the compressor
and provides fundamental knowledge of the role each component plays in the main fluid path,
motor-cooling system, and in the energy and signal flow
• Section 3: Compressor Components
– this section describes in depth component information,
the steps necessary to obtain measurements that verify a component is functional and the steps
necessary to replace a compressor component
• Section 4: Variable Frequency Drive (VFD) Components – this section describes in depth
component information, the steps necessary to obtain measurements that verify a component is
functional and the steps necessary to replace a VFD component
• Section 5: OEM Module Components
– this section describes in depth information regarding
the DC-DC Module and the Compressor Interface Module (CIM), the steps necessary to obtain
measurements that verify those components are functional and the steps necessary to replace
those components
• Appendix A: Acronyms/Terms – this section provides definitions of terms and acronyms used in
this manual
• Appendix B: Special Tooling Specifications
– this section provides drawings for special tools
that are required in order to disassemble/assemble internal VTT components