McQuay MDS030AR Applications Manual page 85

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 is 5kg/cm
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.
Secondary side
2
5kg/cm
Primary side
Pressure adjustor
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.
Main valve
Nitrogen
Avoid wielding too often
Design & installation Guide For McQuay MDS Multi System
Air pressure
2
5kg/cm
Insulation material
2 .
Wood
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