MCAC-VTSM-2015-09 R410A All DC Inverter V4+S Series 60Hz
Installation 105
rush out. (flushing for first time).
Repeat above step1 and step 2 to re-flush dirt (flushing multiple times)
3. When flushing, place a piece of white cotton at the pipe opening to check if there is any moisture.
Method of thoroughly drying pipeline is as follows:
1) Use of nitrogen gas to flush the piping until no dirt and moisture remain.
2) Perform vacuum drying operation (see vacuum drying of MDV refrigerant piping for details).
3) Shut down nitrogen main valve.
4) Repeat the above operations to the connected copper pipe of all indoor units.
5) Flushing sequence: when pipeline has been connected to system, flushing sequence is from farthest to
nearest, relative to the main unit, beginning from the farthest pipe opening to the main unit in turn (i.e.
1)-2)-3)-4)-5)-6)).
Caution: When flushing one pipe opening, block all other pipe openings which are connected in the same
system.
6) After finishing flushing, seal all openings to prevent dust and moisture from entering.
4.6 Piping connection between outdoor units
All connection pipes between outdoor units should be horizontal, it is not allowed the concave at junction site.
The height of each connection pipe between outdoor units cannot be higher than the refrigerant outlet.
4.7 Branch pipe installation
The branching pipe must be installed horizontally and cannot be at an angle greater than 10 degrees..
Otherwise, refrigerant assignment will be uneven and malfunction will occur.
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