Midea MTA1-76HR - Vacuum

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.