Vacuum - Midea MTA1-76HR Technical Manual

Midea R22 T1 side-discharge duct manual

Insert a flare nut into the pipe and flare the pipe.

Put the connecting tubing at the proper position, wrench the nuts with hands, then fasten it with a
wrench. Too large torque will harm the bellmouthing and too small will cause leakage, so it is
needed to determine the torque according to the table

After the pipes between the indoor unit and outdoor unit are connected, replenish compressed
niltrogen to perform airtight test.

The test is performed by using the compressed niltrogen 2.94MPa(30kg/cm

Tighten the spool of the gas valve and liquid valve before compressing the nitrogen.

Compress the nitrogen at the air vent of the gas valve.

The gas valve and liquid valve are closed in the process of compressing the nitrogen.
Notes:
Do not use oxygen, flammable gas or toxic gas in the airtight test.

3.5 Vacuum


From the following table, select a method of expelling air.
Length of connective pipe (Single pass)
Less than 5m
5~15m
Notes:
If the air conditioner is relocated, be sure to use a vacuum pump or refrigerant tank to expel air.
22
Outside Diameter
(mm)
Ф9.52
Ф19.1
Tube size
Ф9.52mm
Ф19.1mm
A (mm)
Max. Min.
12.4 12.0
23.3 22.9
.
Torque
32.7~39.9 N.m
92.7~118.6 N.m
Procedure of expelling air
Use refrigerant in the outdoor unit.
Use vacuum pump or refrigerant tank.
MCAC-RTSM-201301-01
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