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Design & installation Guide For McQuay MDS Multi System
■ Steps:
● Put the pressure adjustor on the nitrogen bottle
● Connect the pressure adjustor with the liquid pipe of the outdoor unit
● Seal any other connecting port,
● Open the valve of the nitrogen and adjust it which the pressure value is 5kg/cm2.
● Check to see if the nitrogen go through the liquid pipe of point A.
● Air blow
◆ Hold a insulation material in your hand and try to seal the side of the copper pipe.
◆ When the pressure is too strong to hold, release the insulation material quickly.
◆ Seal the port of the copper pipe with the insulation material and put a piece of cloth near it,
when you feel that there are some moisture in it, it is time to dry it. And the following steps
are as follows:
◆ Blow the copper pipe with nitrogen,
◆ Process vacuum dry.
● Close the valve of gitrogen bottle;
● Repeat the above operation of unit B;
● When the operation on the liquid pipe is finished, please do the same thing on the gas pipe.
4.3.6 selection of refrigerant pipe material
■ Refrigerant pipe
● Use the long straight copper pipe to reduce the welding times,
● All the pipe must comply with the JIS requirement such as size, material and thickness.
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