McQuay MDS030AR User Manual

-90-
Design & installation Guide For McQuay MDS Multi System
Necessary vacuum
Absolute pressure
(mmHg)
Frozen point
Outdoor temperature range
0
-60
-160
-260
-360
-460
-560
-700
-710
-720
-730
-740
-755
-760
-20 -10 0 10 20 30 40 50 60 70
5
10
20
30
40
50
60
200
300
400
500
600
700
760
0mmHg
Surface pressure (kg/cm
2
)
4.3.11 Refrigerant charging
Calculation of the additional amount of the refrigerant
Additional amount= (
15.88 liquid pipe length x180g/m) + ( 12.7 liquid length x120g/m)
+ (
9.52 liquid lengthx80g/m) + ( 6.35 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 vacuum 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

McQuay MDS030AR Specifications

General

Brand	McQuay
Model	MDS030AR
Category	Air Conditioner
Language	English