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8.9 Utilized tool comparison for MRVIII R22 and R410A
TOOL
PURPO8E
R22
R410A
REA8ON
Knife
Cut the pipe
Ο
Ο
Expander
Enlarge the pipe
Ο
Χ
For R410A, must enlarge the projecting pipe.
Spanner
Fasten the flare nut
Ο
Χ
Standard torque of 1/2, 5/8 pipe is larger.
Flare tool
Flare the pipe
Ο
Ο
Pipe bender
Bend the pipe
Ο
Ο
Pressure gauge
Used in leakage test
Ο
Χ
Leakage test pressure is higher.
Welding torch
Brazing the pipe
Ο
Ο
Gauge manifold
Evacuation device
Ο
Χ
Different pressure from R22: max.: HP5.3Mpa
min.: 3.5Mpa.
Charging hose
Charging refrigerant
Ο
Χ
Vacuum pump with
one-way stop valve
Evacuation device
Ο
Χ
Must ensure oil in vacuum pump can not flow
into the unit when pump stops.
Charging cylinder
Charging refrigerant
Ο
Χ
R410A can not be charged as gas state.
Electronic charging
scale
Charging refrigerant
Ο
Ο
Leakage detector
Leakage detecting
Ο
Χ
Can not use freon detector (CFCs or
HCFCs), R410A excludes Cl. Use the
hydrogen detector (or R134a detector).
Note:
The pipes of R410A connection with the same diameter can not be welded with the flared joints. You must expand
the diameter of pipe joint, then weld the connecting pipe.