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AIR PURGING METHOD IS PROHIBITED FOR R32 SYSTEM
13.5 Air Tightness Test on the Refrigerating System
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation.
There is no extra refrigerant in the outdoor unit for air purging.
Air evacuation and tightness test shall be carried out separately for Tank unit and Duct unit
piping connection with respective 3-way valve (shown below).
Liquid
Gas
3-way valve
for Tank unit
Gas
Liquid
3-way valve
for Duct unit
Additional gas charging shall be carried out only in cooling mode of Duct unit and Tank unit must be in off condition.
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