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Performing the gas leak tests
C
D
A
B
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.
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 )
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 48~49.
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.
English-50
AR5000 ED CO_IB&IM_DB68-05069A_EN.indd 50 2015/3/20 16:15:04
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