Mitsubishi Electric PUZ-A18NHA6 Service Manual page 5

2
Flare cutting dimensions
Nominal Outside
dimensions (in) diameter (mm)
1/4
3/8
1/2 12.70
5/8 15.88
3/4 19.05
3
Tools and materials
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
Safety charger
Charge valve
Vacuum pump
Flare tool
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
: 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.
2-4. LOW AMBIENT COOLING
Precautions for low ambient cooling
Dimension A (
(in [mm])
R410A
11/32-23/64 [ 9.1]
6.35
1/2-33/64 [13.2]
9.52
41/64-21/32 [16.6]
49/64-25/32 [19.7]
—
Use R410A tools
Air purge, refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
and operation check
Tool for HFC refrigerant
Gas leak check
Collection of refrigerant Tool exclusive for R410A
Refrigerant charge Tool exclusive for R410A
Apply to flared section Ester oil, ether oil and
alkylbenzene oil(minimum amount)
Tool exclusive for R410A
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Tool exclusive for R410A
Prevent gas from blowing out
when detaching charge hose
Tools for other refrigerants can
Vacuum drying and air
be used if equipped with adop-
purge
ter for reverse flow check
Tools for other refrigerants
Flaring work of piping
can be used by adjusting
flaring dimension
Tools can be used for other refrigerants
Bend the pipes
Cut the pipes Tools can be used for other refrigerants
Weld the pipes Tools can be used for other refrigerants
Refrigerant charge
Tools can be used for other refrigerants
Check the degree of vacuum. (Vacuum Tools can be used for other
valve prevents back flow of oil and refri-
refrigerants
gerant to thermistor vacuum gauge)
Refrigerant charge Tool exclusive for R410A
Flare nut dimensions
+0 )
Nominal
-0.4
R22 (mm)
dimensions (in) diameter (mm)
9.0 1/4
3/8
13.0
1/2
16.2
5/8
19.4
3/4
23.3
Can R22 tools be used?
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Dimension B
Outside
(in [mm])
R410A R22
6.35 43/64 [17.0]
9.52 7/8 [22.0]
12.70 1-3/64 [26.0]
15.88 1-9/64 [29.0]
—
19.05
(mm)
17.0
22.0
24.0
27.0
36.0