22
Installation Procedure
English
Instal
lation Pr
oc
edur
e
Outdoor unit
A(Liquid)
Indoor unit
B(Gas)
CAUTION
•
Make the electrical connection and leave the system
into “stand by mode”. Do not turn on the system! This
is necessary for better vacuum operation (full OPEN
position of Electronic Expansion Valve - EEV -).
Vacuum
Pump
INDOOR A UNIT
INDOOR B UNIT
3
Open the valve of the low pressure side of manifold
gauge counter clockwise.
4
Purge the air from the system using vacuum pump for
about 30 minutes.
•
Close the valve of the low pressure side of manifold
gauge clockwise.
•
Make sure that pressure gauge show -0.1MPa(-
76cmHg) after about 1 hour. This procedure is very
important in order to avoid gas leak.
•
Turn off the vacuum pump.
•
Remove the hose of the low pressure side of
manifold gauge.
5
Set spindle of both liquid side and gas side of stop
valve to the open position.
6
Mount the valve stem nuts and the service port cap to
the valve, and tighten them with a torque wrench.
Outer diameter
(mm)
Tightening torque
Body cap (N•m)
Charging port
cap (N•m)
ø 6.35
20 to 25
10 to 12
ø 9.52
20 to 25
ø 12.70
25 to 30
ø 15.88
30 to 35
Step 9 Performing the gas leak test
Before completing the installation (insulation of the
cables, hose and piping and fixing of the indoor unit to the
installation plate), you must check that there are no gas
leaks.
To check for
gas leaks on
the...
Then, using a leak detector,check the ...
Outdoor unit
Valves on sections A and B.
Indoor unit
Flare nuts at the end of sections C and
D.
C
D
•
The designs and shape are subject to change according
to the model.
LEAK TEST WITH NITROGEN (before opening valves)
In order to detect basic refrigerant leaks, before
recreating the vacuum and recirculating the R-32, it is
the responsibility of the installer to pressurize the whole
system with nitrogen (using a cylinder with pressure
reducer) at a pressure above 4 MPa (gauge).
Tightening torque for body cap
(Refer to the table)
Spindle
Charging
core
R-22: Thread of the screw - 7/16-2OUNF
R-410A/R-32: Thread of the screw -1/2-2OUNF
Tightening torque for charging port cap (Refer to the table)
