5
○
:
Interchangeability is available with current R22
■
:
Only for Refrigerant R410A (No Interchangeability with R22)
×
: Prohibited
●
: Only for Refrigerant R407C (No Interchangeability with R22)
Measuring Instrument
and Tool
Interchangeability
with R22
Reason of Non-
Interchangeability and Attention
(
★
:
Strictly Required)
Use
R407C
R410A
Refrigerant
Pipe
Pipe cutter,
chamfering
reamer
○
○
─
Cut pipe, remove burrs
Flaring tool
○
○
*R410A requires high pressure resistant
piping and requires a larger flare for
processing. When the hardness of
material used is 1/2H, it cannot be
flared. (The specific tools of R410A can
be directly used for R407C) .
Pipe flaring processing
Extrusion
adjustment
gauge
─
■
Calibre management
after elbow flaring
Pipe bender
○
○
*When the hardness of the material is
1/2H, it cannot be bended. Use elbow
for bending and brazing.
Pipe bending
processing
Expanding tool
○
○
* If the hardness of the material is
1/2H, the expansion process cannot be
performed, and the pipe is connected
by a joint.
Pipe expansion
processing
Torque wrench
○
■
*For R410A when flare nut size is Ø12.7
and Ø15.88, spanner size should be
larger than 2mm.
Tighten the flare nut
○
*Can be commonly used in Ø6.35,
Ø9.52, Ø19.05.
Brazing
equipment
○
○
*To ensure the correct brazing (can
adjust flame, heating, and add filler).
Brazing connection of
refrigerant pipe
Nitrogen gas
○
○
*To prevent the pipe line is
contaminated (brazing blowing nitrogen
to prevent oxidation).
Prevent oxidation
Lubricating
oil (applied to
flaring surface)
●
■
*Use the same lubricating oil as the
refrigeration system.
*Oil is easy to absorb water.
Lubricate the flaring
surface
Refrigerant
charging
vacuum
drying
Refrigerant
cylinder
●
■
*Confirm the corresponding refrigerant
in the cylinder.
★
Non-azeotropic mixed refrigerant
should be filled in liquid state.
Refrigerant charge
Vacuum pump
○
○
★
Can use the existing vacuum pump,
but the connector should be connected
to prevent the mineral oil flow back
when vacuum pump stopped.
Vacuum
Vacuum pump
connector (to
prevent back
flow)
●
can be
generally
used for new
refrigerant
※■
can be
generally
used for new
refrigerant
Regulating
valve
●
■
*Because the pressure is higher
than the R22 standard, it cannot
be gernerally used. The connection
diameter is different: R410A: UNF1/2,
R407C: UNF7 / 16.
★
It is forbidden to use the old
components, otherwise the attached
mineral oil will accumulate and may
cause the circuit blocked and the
compressor to malfunction.
Vacuuming, keep
vacuum to charge
refrigerant, detect
pressure
Charging hose
●
■
Charging
cylinder
×
×
*Use weight gauge to charge
refrigerant.
Refrigerant charge
Weighing
instrument
○
○
─
Measure the amount of
refrigerant charging
Leakage
detector
●
can be
generally
used for new
refrigerant
※■
can be
generally
used for new
refrigerant
*Leakage detector for R22 cannot be
generally used due to different detecting
method.
Check for gas leakage
※
: Generally used for R407C
