York R-410A, Technical & Service Manual, Page: 260 / 385

Installation
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Main pipe of the branch part is vertical to the horizontal plane, which can avoid bad
effect due to uneven distribution of gas and liquid.
A
2) Protection of outdoors refrigerant pipes
Sudden dandification also should be considered except heat-insulated layer. If the length
of bare part is over 1m, a buckle-board must be added to the bare part.
3) Laying principle of YDS refrigerant pipes
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Centralized laying, lying along the wall, and trying to make full of use of corridor.
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After finishing lying, binding up the refrigerant pipes with white binding-strap. After
finishing winding-up every pipe separately, please try to binding up all pipes
together according to the diameters and the degree of tightness should be based on
no feeling of flexible.
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When installing the connection pipes and electric wires (power wire, control wire),
they should be laid along the wall, turn the corner logically, flat and straight, parallel
with each other and packed together. And try to avoid striding over and blocking
the traffic.
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The connection pipes and electric wires should be as short as possible.
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Try to bind up all pipes and no bareness is allowed at the connecting part.
4) Precautions about laying refrigerant pipes
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Pulling pipe: mark the system No. in the pipes to prevent wrong connection.
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Make sure the support of the pipes is firm enough.
4.6.5 Refrigerant pipe flushing
Refrigerant pipe flushing is a method to eliminate filter. It has three main functions:
When nitrogen is insufficient, flushing can eliminate oxide air bubble.
When the end of the pipe can’t seal well, flushing can eliminate filter and humidity.
Flushing can check the indoor/outdoor pipe connection.
Main procedure is as the following: