F-AR18FSSSCWK1 User Manual

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English-56

Performing the gas leak tests

Make sure to check for gas leaks before completing the installation process (connecting the assembly pipe and hose between

indoor unit and outdoor unit, insulating the cables, hose and pipe, and xing the indoor unit to the installation plate).

To check for gas leaks on the outdoor unit,

CheckthevalveAandBusingaleakdetector.

To check for gas leaks on the indoor unit,

Check the are nut C and D using a leak detector.

Leak test with nitrogen (before opening valves)

Inordertodetectbasicrefrigerantleaks,beforerecreatingthevacuumandrecirculatingtheR-410A,it’sresponsibleof

installer to pressurize the whole system with nitrogen (using a cylinder with pressure reducer) at a pressure above 40 bar

(gauge).

Leak test with R-410A (after opening valves)

Before opening valves, discharge all the nitrogen from the system and create vacuum according to page 53~55.

Afteropeningvalves,checkleaksusingaleakdetectorforrefrigerant.

Pump down (before disconnecting the refrigerant connections for unit repair, removal or disposal)

Pump-down is an operation intended to collect all the system refrigerant in the outdoor unit.

This operation must be carried out before disconnecting the refrigerant tubing in order to avoid refrigerant loss to the

atmosphere.



ShutotheliquidvalvewiththeAllenwrench.



Turn the system on in cooling with fan operating at high velocity.

( Compressor will immediately start, provided 3 minutes have elapsed since the last stop).



After2minutesofoperation,shutthesuctionvalvewiththesamewrench.



Turn the system o and switch mains supply o.



Disconnecttubing.Afterdisconnection,protectvalvesandtubingendsfromdust.



Compressor damage may occur if run at a negative suction pressure.

Test part for outdoor unit

Tightening torque for body cap

(Refer to the table)

Charging

core

Spindle

R-22:Diameterofthescrew-7/16-20UNF

R-410A:Diameterofthescrew-1/2-20UNF

Tightening torque for charging port cap

(Refer to the table)

Test part for indoor unit



Before inspecting the leakage, use a torque wrench

to close the cap for the service valve. (Comply with a

tightening torque for each size of the diameter,and

tighten the cap rmly to prevent any leakage.).



To check for any possible leakage, insert inert gas into

the pipes connected to indoor/outdoor units and

check the connection part of the indoor/outdoor units

with soap lather or liquid for leakage test.

Outer

Diameter

(mm)

Tightening torque

Body cap (N•m)

Charging port cap

(N•m)

ø 6.35

20 ~ 25

10 ~ 12

ø 9.52

20 ~ 25

ø12.70

25 ~ 30

ø15.88

30 ~ 35

ø19.05

35 ~ 40

( 1 N•m=10kgf•cm )

A3050 Australia_IB&IM_DB68-05206A_EN.indd 56 2014/12/29 19:07:43

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User Manual - Page 56