Gree U-match Série Manuel De L'utilisateur page 30

DC Inverter U-match Series Cassette Type Unit
The method of screwing the flare nut is the same with that for indoor unit.
3.2.3.5 Thermal Insulation of Pipe Joint (Only for Indoor Unit)
Stick coupler heat insulation (large and small) to the place where connecting
pipes.
Reference A
Front outlet
Coupler heat
insulation (small)
on the pipe
3.2.3.6 Sealing of the Knock-off Hole
As for the built-in valve model, during the installation process for connection
pipe, when the connection pipe is passing through the knock-off hole, conduct
sealing with insulated cotton in the knock-off hole of outdoor unit to prevent small
animals from entering. See the following figure.
Gas pipe
Pipe
coupling
3-way valve
Coupler heat insulation
(large) on the pipe
Liquid pipe
Gas pipe
Liquid pipe
or
or
2-way valve
Reference A:
Cover this portion with heat
insulating material also without fail
No gap
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Heat insulation pipe