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3. Refrigerant Pipe
DANGER
Use refrigerant according to outdoor nameplate. When carrying out the leakage check and test, do not mix in the
oxygen with the acetylene and the flammable reactive gas, because these gases may result in explosion. It is
suggested to use nitrogen to perform these tasks.
3.1 Pipe Material
(1) Select clean, and dry copper pipes.
(2) Choose dustless, dry and non-humid, clean copper pipe.
Before installing the pipe, use nitrogen or dry air to blow away dust and impurity on the pipe.
(3) Choose the copper pipe according to outdoor manual.
3.2 Piping Connection
(1) The connection positions of the pipe are shown below.
Refer to the outdoor unit Installation Instructions for details on pipe sizing, selection, pipe installation, and
charging information.
Evaporator coil is pressurized with Nitrogen at the factory and shipped. Evacuate the system before charging
with refrigerant.
Install refrigerant lines so that they do not block service access to the front of the unit.
Nitrogen should flow through the refrigerant lines while brazing.
Use a wet rag or an approved heat paste to protect the TXV sensing bulb during the brazing process.
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