Mitsubishi Heavy Industries SRC25QA-S, Technical Manual, Page: 73 / 102

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e) Flare tool (clutch type)
● The flare tool for R410A has a big clamping bar receiving hole, so as to set the copper pipe
portion protruding from the clamping bar during flaring to 0~0.5mm and have stronger
elasticity for the increased torque of EEV. This type of flare tool can also be used for R22
copper pipes.
f) Adjusting the scaled rule for the protruding portion (used when a conventional flare tool
(including clutch type) is used for flaring)
● A scaled rule with the thickness of 1.0mm helps setting the protruding portion of the copper
pipe in the clamp to 1.0~1.5mm.
g) Vacuum pump adapter
● In order to prevent the vacuum pump oil from returning into the charge hose, be sure to use
an adapter. The connection of the charge hose has two ports, one for conventional
refrigerants (7/16 UNF, 20 screw threads per inch) and one for R410A. If the vacuum
pump oil (mineral oil) is mixed with R410A, deposit may be produced, which will damage
the appliance.
h) Refrigerant cylinder
● According to the U.S.A regulations, refrigerant cylinders designed specifically for R410A
are marked with the refrigerant name and have pink coating.
i) Charging port and package for refrigerant cylinder
● According to the cap size of the charge hose, a charging port (1/2 UNF, 20 screw threads
per inch) and corresponding package are required.
j) Gas leakage detector
●Use a highly sensitive gas leakage detector designed specifically for HFC refrigerants. For
R410A, the detection sensitivity is about 23g/ year.
(2) Frequently used tools
a) Vacuum pump
b) Torque wrench
For 1/4, side-to-center distance 17 mm x
(16 N · m)
(160 kgf · cm)
For 1/4, side-to-center distance 17 mm x
(18 N · m)
(180 kgf · cm)
For 3/8, side-to-center distance 22 mm x
(42 N · m)
(420 kgf · cm)
c) Pipe cutter
d) Driller
e) Screw driver (+,-)
f) Steel saw
g) Hollow drill (Φ65 or 70)
h) Hexagon wrench
(side-to-center distance 4 or 5
mm)
i) Wrench or monkey wrench
j) Tapeline
k) Thermometer
l) Clamping ammeter
m) Insulation resistance meter
(megameter)
n) Circuit tester
o) Pipe bender
(3) Applicability of tools for R410A to models using R22
Table 15 Applicability of tools for R410A to models using R22
Tools for R410A Applicability to models using R22
a) Manifold pressure gauge X
b) Charge hose X
c) Electronic loadcell scale for charging refrigerant O
d) Torque wrench (rating diameter 1/2, 5/8) X
e) Flare tool (clutch type) O
f) Scaled rule for adjusting protruding portion* O
g) Vacuum pump adapter O
h) Refrigerant cylinder X
i) Charging port and package for refrigerant cylinder X
j) Gas leakage detector X
* Used when the conventional flare tool (clutch type) is used.
Note: If you have
any questions, please consult your dealer.