McQuay MDS030AR User Manual

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Design & installation Guide For McQuay MDS Multi System
Selection of vacuum pump
When selecting a vacuum pump, please pay attention to the follows:
The range of vacuum must be up to -755 mmHg
The vacuum pump should have a large exhaust volume(more than 40 litres/min).
Water boiling point(c) Pressure(mmHg) Vacuity(mmHg)
40 55 -705
30 36 -724
26.7 25 -735
24.4 23 -737
22.2 20 -740
20.6 18 -742
17.8 15 -745
15.0 13 -747
11.7 10 -750
7.2 8 -752
05-755
Sequence of vacuum drying
According to the different ambient, vacuum drying has two ways:
Ordinary vacuum drying
Operating sequence:
Connect the pressure gauge with the liquid pipe and gas pipe, then run the vacuum pump
for more than 2 hours to reach the vacuity of -755 mmHg.
After pumping for 2 hours, if the pressure is higher than -755 mmHg, or there is some
moisture, then pump it for 1 more hour.
After 3 hours pumping, if the pressure is still higher than -755 mmHg, please check to see
if there are some air leak gap.
When the pressure is -755mmHg, stop pumping and wait for 1 hour to see if the pressure
change. If the pressure change, that means there are some air leak gaps or there is some
moisture in the pipe.
Type Max. exhaust volume
Application
Vacuum drying Air discharge
Vacuum pump with lubricant
0.02mmHg
Suitable Suitable
100L/min
10mmHg
Unsuitable Suitable
40L/min
Vacuum pump without lubricant
0.02mmHg
Unsuitable Suitable
50L/min
Type of vacuum pump and the vacuity
Notes
Vacuum should be held both in the liquid pipe and the gas pipe at the same time.

McQuay MDS030AR Specifications

General

Brand	McQuay
Model	MDS030AR
Category	Air Conditioner
Language	English