York JVOHQ Series Installation & Maintenance Manual page 9

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