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Tools and Instruments -
The pressure of refrigerant R410A is about 1.6 times higher than that of currently used R-22 refrigerant.
Therefore it is more susceptible to impurities such as moisture, acid, grease, etc. As this is a new refrigerant,
the refrigeration oil also has to be changed. Care should be taken not to allow moisture, impurities, existing
refrigerant and refrigeration oil to come into the circulation system.
To avoid entry of old refrigerant and refrigeration oil, the size of the alignment fitting for refrigerant charging
and the flare nut size is different from the existing one. Use the following tools exclusively for R410A.
Be sure to use new refrigerant pipes (old piping used by refrigerant R-22 replaced reused after cleaning is
not allowable.)The measuring machine or tool that may come in contact with the refrigerant should be used
exclusively for the new refrigerant.
Symbolic description ： ○ Can be used by new and old refrigerant
Measuring Instrument,
tool
Pipe cutter
Pipe expander
Washers for pipe
expansion
adjustment
Pipe bender
Pipe expansion
tool
Torque wrench
Welding machine
Nitrogen gas
Refrigeration oil
for applying it on
the flare
Refrigerant Piping
□ Only for new refrigerant R410A (R-22 not applicable)
Interchange
Reason of Non-Interchange and Attention
with R-22
○
To ensure compression resistance of the flare
○□
for R410A, the flare opening must be enlarged.
In the case of continual use of the existing item,
a washers (1mm) matching with the pipe
expansion adjustment must be used. In the
□
case of 1/2H copper pipe, it is impossible to
process.
If using a 1/2H copper pipe, it is impossible to
○
process. Use the connection of a bend to be
welded instead.
If using a 1/2H copper pipe, it is impossible to
○
process. Use the connection of a fitting to be
welded instead.
Sizes of ¯ 12.7, ¯ 15.88 wrenches should
□
increase 2 mm. Existing item must not be used.
○
Can be used for ¯ 9.53, and ¯ 19.05
Follow correct welding operation. (Flame
○
adjustment, heating method, heating
temperature, weld material selection.)
More strict control of dust entrance.
(Observe nitrogen gas blowing in when
○
welding)
Use of mineral oil for R-22 is prohibited. Only
synthetic oil corresponding to the product can
□
be used.
Synthetic oil has a higher tendency for moisture
absorption. Do not store it in a humid place.
( ◎ : Strictly Required)
REFRIGERANT PIPING
Application
For refrigerant pipe
cutting and burr
removing.
Expanding flare of
the refrigerant
pipe.
For copper pipe
overhang size
control when
processing flares.
For refrigerant pipe
bending.
For refrigerant pipe
expanding.
For tightening flare
nuts
For welding of
refrigerant pipes
Avoiding oxidation
when welding and
for air-tightness
test
Smearing on the
flare face and for
maintenance
18
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