Midea MONB-76C, Technical Manual

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Midea R22 T1 side-discharge duct manual MCAC-RTSM-201301-01
22

Insert a flare nut into the pipe and flare the pipe.
Outside Diameter
(mm)
A (mm)
Max. Min.
Ф9.52
12.4 12.0
Ф19.1
23.3 22.9

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
.
Tube size Torque
Ф9.52mm
32.7~39.9 N.m
Ф19.1mm
92.7~118.6 N.m

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
2
g)

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) Procedure of expelling air
Less than 5m Use refrigerant in the outdoor unit.
5~15m Use vacuum pump or refrigerant tank.
Notes:
If the air conditioner is relocated, be sure to use a vacuum pump or refrigerant tank to expel air.