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Design & installation Guide For McQuay MDS Multi System
4.3.11 Refrigerant filling
■ Calculation of the additional amount of the refrigerant
Additional amount= (φ 15.88 liquid pipe length x180g/m) + (φ12.7 liquid length x120g/m)
+ (φ 9.52 liquid lengthx80g/m) + (φ6.35 liquid length x50g/m).
4.3.12 Vacuum pumping
■ Vacuum drying of the refrigerant pipe
● Vacuum drying
Vacuum drying is to dry the pipe by vaporizing the water (liquid) in the pipe with a vacuum
pump and discharge it. Under one atmospheric pressure, the water boiling point (steam
temperature) is 100 degrees Celsius. When the pressure in the pipe is reduced to nearly
vacuum by using a vacuum pump, the boiling point reduces. When the boiling point goes
under the outdoor temperature, the water in the pipe vaporizes.
Before vacuum drying, make sure you know how to select a vac uum pump and how to
maintain.
■ The refrigerant amount of fill of the outdoor unit before delivery (excluding the refrigerant to be
filled in the site pipe)
■ The additional amount of the refrigerant depends on the liquid pipe diameter and length (based
on the liquid pipe).
Diameter of the liquid pipe (mm) 6.35 9.52 12.7 15.88 19.05
Amount of the additional refrigerant (g/m) 50 80 120 180 290
Calculate the refrigerant amount accord-
ing to the length of the liquid pipe
Add additional refrigerant
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