Midea TempMaker Series Technical Manual page 85

MCAC-UTSM-2014-03
just touches the chamfered retaining wall.

Replace plunger cap finger tight, then tighten an additional 1/12 turn (1/2 hex flat). Cap must be
replaced to prevent leaks.

Never attempt to repair any brazed connections while the system is under pressure. Personal
injury could result.

After the pipes between the indoor unit and the outdoor unit are connected, replenish
compressed nitrogen to perform airtight test.

The airtight test is performed by using the compressed nitrogen, 2.94MPa (30kg/cm
Leak test with a bubble type leak detector. Do not use the system refrigerant in the outdoor
unit to purge or leak test.

Tighten the spool of the low pressure valve and high pressure valve before compressing the
nitrogen.

Compress the nitrogen at the air vent of the gas valve.

The low pressure valve and high pressure valve are closed in the process of compressing
the nitrogen.

Do not use oxygen, flammable gas or toxic gas in the airtight test.

Vacuum
Length of connective pipe
Note: If the air conditioner is relocated, be sure to use a vacuum pump or refrigerant tank to expel air.

Use the refrigerant in the outdoor unit to expel air.

Screw up the pipe nuts at A, B, C and D completely.

Loosen and remove the square-head cover of valves A and B, rotate the square-head
(Single pass)
Less than 5m
5~15m
R410A 380~415V 3Ph 50Hz TempMaker Series Split AC
Procedure of expelling air
Use refrigerant in the outdoor unit.
Use vacuum pump or refrigerant tank.
2
G).
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