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Appendix
Si39-406
128
General Information
7.10.6 Example 6:
Cracks develop in field pipes due to thermal expansion and
contraction
Situation
Refrigerant piping has developed cracks in soldered points and is leaking gas.
Cause
Both ends of the pipe have been tightly fixed in place.
↓
Starting and stopping the compressor has caused temperature to vary, thus the pipes have
expanded and contracted which places stress on soldered parts.
↓
Cracks have formed because of repeated expansion and contraction.
Remedial Action
Fit the pipe with a loop as shown in the below drawing.
Main Points
Take thermal expansion and contraction along the spline into consideration when installing pipe
supports.
For Your
Reference
Expansion (m) = Full length × Coefficient of thermal expansion × Rise in temperature
Coefficient of thermal expansion for copper: 16.5 × 10
-6
Example For a pipe length of 10 m and a rise in temperature of 50°C, expansion reaches 8.2mm.
Summary of Contents for REYQ96MTJU
Page 1: ...Design Installation Testing Instruction R410A Heat Recovery 60Hz REYQ96MTJU Si39 406...
Page 6: ...Si39 406 iv Table of Contents...
Page 34: ...Installation Si39 406 28 General Information Flaring Procedure...
Page 68: ...Installation Si39 406 62 General Information Caution Caution label 3P124617 4P124614...
Page 114: ...Appendix Si39 406 108 General Information 3P135887 1...
Page 126: ...Appendix Si39 406 120 General Information 7 8 3 BS Unit BSVQ36MVJ BSVQ60MVJ 4D045338...
Page 128: ...Appendix Si39 406 122 General Information 7 9 2 Field Wiring REYQ96MTJU 3D042647A...
Page 156: ...Refrigerant Piping Si39 406 150 Installation Manual REYQ96MTJU...
Page 158: ...Refrigerant Piping Si39 406 152 Installation Manual REYQ96MTJU...
Page 230: ...Precautions for New Refrigerant R410A Si39 406 224 Precautions for New Refrigerant R410...
Page 236: ...375 Park Avenue Suite 3308 New York N Y 10152 info daikinac com www daikinac com...