Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 252

Pay attention to the following points in addition to the above for the R410A and compatible machines.
To prevent a different oil from entering, please assign dedicated tools, etc. to each refrigerant type. Under no
circumstancescharge hose in particular be shared with other refrigerant types (R22, R407C, etc.).
Use a counterflow prevention adapter to prevent vacuum pump oil from entering the refrigerant system.
Liquid operation valve
(with a charge port)
You can purge air with either liquid service valve or gas service valve.
●
When a vacuum air purge is completed, remove the valve rod cap nuts and open the service valves (both liquid and gas sides) as
illustrated below. After you have made sure that the valves are in the full-open position, tighten the cap nuts (for the valve rods and
charge ports).
Hexagonal wrench type
Hexagonal wrench
(M4)
Open
Open the valve rod until it touches the stopper.
●
You need not apply force to push it further.
For tightening torque, refer to the table below.
Tightening torque
Service valve size
(mm)
¿9.52 (3/8")
¿15.88(5/8")
¥ When an operation is completed, replace the cap nut and tighten it as before.
¥ Shaft operation, cap and cap nut is performed by excessive torque, it will become failure and
a cause of a leak, please follow a table.
Compound pressure gauge Pressure gauge
-101KPa (-755mmHg)
Handle Lo
Charge hose (for R410A only)
In-unit check joint
Gas operation valve
Liquid/gas operation
Cap tightening torque
(N-m) (N á m)
6 ~ 8
20 ~ 30
14 ~ 16
30 ~ 40
248
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Gauge manifold
(for R410A only)
Handle Hi
Charge hose
(for R410A only)
Check valve
Vacuum adapter
(for R410A only)
Vacuum
Charge port
pump
Pin type
Remove the hexagon cap nut, set it as illustrated
in the drawing below.
Stopper
Factory setting (close) Open
Cap nut tightening torque
of check joint
(N á m)
10 ~ 12
10 ~ 12
-
Pin