McQuay MDS300B Instalační příručka stáhnout pdf (Strana 92)

-92-

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) + (φ 12.7 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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McQuay MDS300B Instalační příručka Strana 92