Piping Installation - McQuay MDS080B R Installation Manual

● Notice
The pump cannot be used in a vary polluted environment,
and the condensing water plate of the indoor unit should be
keep clean;

7 Piping installation

Multi digital scroll --- One outdoor unit couple with multi indoor units; only the professional staff can conduct the installation;
For piping connection, there will be gas pipe and liquid pipe connection, gas pipe with horn connection and connection between pipe and
pipe;
7． ． ． ． 1 Notes for piping installation
（ 1 ） Copper tube material: to check the thickness and diameter , ensure the clearness of the copper tube;
（ 2 ） To machine to vacuum the unit, It is not allowed to use refrigerant to vacuum the units;
nd
（ 3 ） Do not use the 2
refrigerant piping;
（ 4 ） Do not use any detergent to clean the refrigerant piping;
（ 5 ） To seal the outlet of the copper tube , to avoid any dust or dirt or water to enter inside;
（ 6 ） When install the piping work, to ensure not do it in raining day;
（ 7 ） To avoid the bending and turning of piping;
（ 8 ） For welding requirement, to use the right welding material to ensure the quality;
（ 9 ） Copper tube insulation is a must to ensure the heat exchange efficiency, to avoid the drop of condensing water;
（ 10 ） When installing the refrigerant piping, all ball valve shall be in constant closed status, before completing the leakage test and vacuum
processing, it is not allowed to open the ball valve;
（ 11 ） When move or relocate the units, in charge the right refrigerant and ensure the refrigerant weight is requested as shown in nameplate;
7． ． ． ． 2 Refrigerant piping system:
The below 3 structure designs are recommended:
(1) Connecting by bifurcation
（ 2 ） Use only one distributor
Bifurcation
Indoor
unit
Controller
Controller
Distributor
Indoor
unit
©2005 McQuay International
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