Dimensions Of Flare Cutting And Flare Nut; Tools For R410A - Mitsubishi Electric Mr.SLIM PU-P71VHA Service Manual

2Dimensions of flare cutting and flare nut

The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because of its working pressure higher than that of other refriger-
ants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R410A has been speci-
fied separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A also
has partly been changed to increase intensity as shown below. Set copper pipe correctly referring to copper pipe flaring
dimensions for R410A below. For 1/2" and 5/8", the dimension B changes.
Use torque wrench corresponding to each dimension.
Dimension A
Flare cutting dimensions
Nominal Outside
dimensions diameter
1/4" 6.35
3/8" 9.52
1/2" 12.70
5/8" 15.88
3/4" 19.05
3Tools for R410A (The following table shows whether conventional tools can be used or not.)
Tools and materials Use
Gauge manifold Air purge, refrigerant charge and
Operation check
Charge hose
Gas leak check
Gas leak detector
Refrigerant recovery equipment Collection of refrigerant
Refrigerant cylinder Refrigerant charge
Applied oil Apply to flared section
Safety charger Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Charge valve Prevent gas from blowing out
when detaching charge hose
Vacuum pump Vacuum drying and air
purge
Flare tool Flaring work of piping
Bend the pipes
Bender
Cut the pipes
Pipe cutter
Welder and nitrogen gas cylinder Weld the pipes
Refrigerant charging scale Charge refrigerant
Vacuum gauge or thermis- Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
tor vacuum gauge and
gerant to thermistor vacuum gauge)
vacuum valve
Charging cylinder Charge refrigerant
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
OC379F
Flare nut dimensions
(mm)
Dimension A ( )
+0
-0.4
R410A R22
9.1 9.0
13.2 13.0
16.6 16.2
19.7 19.4
— 23.3
R410A tools
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil and alkylbenzene
oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adop-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
7
Nominal Outside
dimensions diameter
1/4" 6.35
3/8" 9.52
1/2" 12.70
5/8" 15.88
3/4" 19.05
Can R22 tools be used?
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Dimension B
(mm)
Dimension B
R410A R22
17.0 17.0
22.0 22.0
*
36.0mm for
26.0 24.0
indoor unit
*
29.0 27.0
of RP100,
–
36.0 125 and 140
Can R407C tools be used?
Ester oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)