Daikin VRV Plus Series General Information Manual page 123

Si33-003.book Page 119 Monday, June 25, 2001 9:06 AM
SiE33-003
7.9.5 Example 5: Excessive noise due to incorrect angling of REFNET joints
Situation
The noise of the refrigerant flow during defrosing is excessive.
Source of Problem
The angle of the fittings was incorrect and needed to be rectified as shown in the following figure.
and Remedial
Action
1. REFNET joints
2. REFNET header
Main Points
General Information
The REFNET joints should be installed such that branches meet the main pipe either horizontally or
vertically at an angle of exactly 90 degrees.
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.)
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)
: http://splitoff.ru/tehn-doc.html
Appendix
119