Fujitsu Airstage J-II Series Design & Technical Manual page 577

„ WORK FLOW (EXAMPLE)
„
Prepare Project Schedule
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
Refrigerant piping connection (Outdoor unit)
Leak pressure test
Vacuum evacuation and drying
Additional Refrigerant Charge
Gas leakage check
Outside panel installation
Test run and adjustment
Hand over
Customer Training
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. (609 psi (4.2 MPa))
● Do not use pipe with dust and dirt sticking to it during piping
connection work.
● Always flow dry nitrogen through piping while brazing.
● Do not connect to the power source.
● Pressurize system with 600 PSI Nitrogen.
● System must hold 600 PSI for a minimum of 24 hours.
● Do not purge system with refrigerant.
● Use a vacuum pump with check valve to prevent the
backflow of vacuum pump oil into the refrigerant system.
● Calculate additional refrigerant charge. Add additional
refrigerant with R410A gage manifold and hose.
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