Daikin FTXN09NMVJU - Air Filter Cleaning (Models FTX09;12)

7 ■English
Outdoor Unit Installation
5. Pressure test and evacuating system
WARNING
• Donotmixanysubstanceotherthanthespeciedrefrigerant(R410A)intotherefrigerationcycle.
• If refrigerant gas leaks should occur, ventilate the room as soon and as much as possible.
• R410A,aswellasotherrefrigerants,shouldalwaysberecoveredandneverbereleaseddirectlyintotheenvironment.
• UseavacuumpumpforR410Aexclusively.Usingthesamevacuumpumpfordifferentrefrigerantsmaydamagethevacuum
pump or the unit.
• When piping work is complete, it is necessary to perform a pressure test
and evacuate system with a vacuum pump.
• If using additional refrigerant, perform air purging of the refrigerant pipes
and indoor unit using a vacuum pump, then charge additional refrigerant.
• Use a hexagonal wrench (3/16 inch (4mm)) to operate the stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench to the
speciedtighteningtorque.
Compound
pressure gauge
Pressure
meter
High-pressure
valve
Low-pressure
valve
Vacuum pump
Service port
Liquid
stop
valve
Valve caps
Gas stop valve
Charging
hoses
Gauge
manifold
1) Pressurizetheliquidpipeandgaspipefromtheserviceportsofeachstopvalveto550psi(3.8MPa)(donotpressurize
morethan550psi(3.8MPa))for1hourminimum,24hoursrecommended.Ifthereisapressuredrop,checkforleaks,
make repairs and perform the pressure test again.
2) Connect projection side of charging hose (which comes from gauge manifold) to gas stop valve’s service port.
3) Fully open gauge manifold’s low-pressure valve (Lo) and completely close its high-pressure valve (Hi).
(High-pressure valve subsequently requires no operation.)
4) Evacuatesystemusingvacuumpumptobelow500micronsfor1hourminimum.
5) Close gauge manifold’s low-pressure valve (Lo) and stop vacuum pump.
(Keep this state for a few minutes to make sure that the compound pressure gauge pointer does not swing back.)*
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6) Remove covers from liquid stop valve and gas stop valve.
7) Turntheliquidstopvalve’srod90°counter-clockwisewithahexagonalwrenchtoopenthevalve.
Close it after 5 seconds, and check for gas leakage.
Usingsoapywater,checkforgasleakagefromindoorunit’sareandoutdoorunit’sareandvalverods.
After the check is complete, wipe all soapy water off.
8) Disconnect charging hose from gas stop valve’s service port, then fully open liquid and gas stop valves.
(Do not attempt to turn valve rod beyond its stop.)
9) Tightenvalvecapsandserviceportcapsfortheliquidandgasstopvalveswithatorquewrenchtothespeciedtorques.
*
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If the compound pressure gauge pointer swings back, refrigerant may have water content or a loose pipe joint may exist.
Check all pipe joints and retighten nuts as needed, then repeat steps 3) through 5).
01_EN_3P379970-2A.indd 7 11/6/2014 2:05:05 PM