Fujitsu AUYG07LVLA Design & Technical Manual page 260

WORK FLOW (EXAMPLE)
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
Refrigerant piping connection (Outdoor unit)
Leak pressure test
Vacuum evacuation and drying
Refrigerant additional charging
Gas leakage check
Check run
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 matching the specified material and
thickness to meet endurance pressure of the pipe. (4.2 MPa)
Do not use pipes contaminated with dust and dirt during
piping connection 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.)
- (06 - 12) - 6. SYSTEM DESIGN