Carrier X-POWER Series Service Manual page 112

R410a DC Inverter 60Hz Carrier service manual
3. During flushing, place a piece of white cotton at the pipe opening for checking, and you shall find
some humidity occasionally.
Way of thoroughly drying pipeline is as follows:
1) Making use of nitrogen gas to flush the inner part of pipe until no dirt and humidity.
2) Carry out vacuum drying operation (see vacuum drying of refrigerant piping in detail).
3) Shut down nitrogen main valve.
4) Repeat above operations to the connected copper pipe of all indoor units.
5) Sequence of flushing: when pipeline has been connected to system, sequence of flushing is from far
to near, that is, in light of principal unit, flushing from the farthest pipe opening to principal unit in turn (i.e.
1)-2)-3)-4)-5)-6)).
②
⑥ ⑤ ④ ③ ①
Caution: When flushing one pipe opening, block all pipe openings which are connected to this opening.
6) After finishing flushing, seal soundly all openings linked with atmosphere to prevent the entering of
dust, trash and moisture.
3.1.6 Installation highlight of pipe system
1) Pipe between outdoor units must install horizontally, the mid-connecting pipe between those pipes
aren't allowed downward drop.
2) All pipes between outdoor units cannot be higher than the outdoor units' outlet.
The right installation type:
The wrong installation type:
130 Installation