Fujitsu AIRSTAGE J-II Design & Technical Manual page 456

WORK FLOW (EXAMPLE)
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Prepare schedule of works
Refrigerant check
Operation chart preparation
Indoor unit installation
Refrigerant piping work
Drain piping work
Duct work
Insulation work
Remote controller installation
Electric wiring work
Outdoor unit foundation work
Outdoor unit installation
Address setting
Indoor unit connection check
Refrigerant piping connection (Outdoor unit)
Leak pressure test
Vacuum evacuation and drying
Refrigerant additional charging
Gas leakage check
Outside panel installation
Test run and adjustment
Hand over
Customer guidance
Preparations
● Always check the refrigerant to be used.
● Always use the specified refrigerant.
● Prepare materials / tools matched to the refrigerant.
Start of work
● Use copper tube of the specified material and thickness to
meet endurance pressure of the pipe. (4.2 MPa)
● Do not use pipe with dust and dirt sticking to it during piping
connection work.
● Always flow nitrogen during welding work.
● Do not connect to the power source.
● Seal with nitrogen up to 4.2 MPa.
● After 24 hours, check wether the pressure in piping has not
descended.
● Air purging by refrigerant gas is strictly prohibited.
● Use a special vacuum pump with reverse check mechanism.
● Calculate the refrigerant additional charging amount, and
charge a suitable amount. (Using a special R410A gauge
manifold and charging hose.)
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