Bad Examples and Good Examples in Installation
PACD011001G2 / PACD011004G3
76
Urban Multi Inverter “MX1” Series
7.6
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 8.2 mm.
Содержание Urban Multi MX1 Series
Страница 34: ...Installation 1 PACD011001G2 PACD011004G3 34 Urban Multi Inverter MX1 Series Ceiling Type CS TM ...
Страница 54: ...Installation 1 PACD011001G2 PACD011004G3 54 Urban Multi Inverter MX1 Series ...
Страница 102: ...Appendix Check Points in Installing UM Series PACD011001G2 PACD011004G3 102 Urban Multi Inverter MX1 Series ...
Страница 103: ...PACD011001G2 PACD011004G3 Appendix Check Points in Installing UM Series Urban Multi Inverter MX1 Series 103 1 ...
Страница 104: ...Appendix Check Points in Installing UM Series PACD011001G2 PACD011004G3 104 Urban Multi Inverter MX1 Series ...