SiEN34-705
Appendix
General Information
199
7.14.5 Example 5: Excessive Noise due to Incorrect Angling of REFNET
Joints
Situation
The noise of the refrigerant flow during defrosting is excessive.
Source of
Problem and
Remedial Action
The angle of the fittings was incorrect and needed to be rectified as shown in the following
figure.
1. REFNET joints
The REFNET joints should be installed such that branches meet the main pipe either
horizontally or vertically at an angle of exactly 90 degrees.
2. REFNET header
The REFNET header is a lateral flow pipe and should be fitted so as to allow horizontal
branch fittings. (Vertical or sloping fitting is not permissible.)
Main Points
!
Reasons for using refrigerant branch kit
Fittings of REFNET joints or headers which are not carried out in strict accordance with the
principles outlined here may result in complaints relating, for example, to “poor performance”
of the system or “noisy refrigerant flow”. (To prevent unbalance flow or oil shortage)
(Horizontal fitting)
(Vertical fitting)
Vertical
(Horizontal line)
±
30 degrees or less
(Section seen from point A)
(Horizontal line)
(Section seen from point B)
Horizontal
Horizontal
Horizontal
Horizontal
Содержание RXYQ5PY1
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