Specifications
1. Compared to the conventional refrigerant system,
large amounts of contaminants (oil, water, oxidized
film) enter the refrigerant system. Thus, when using
clean piping, or displacing the nitrogen during brazing,
If the refrigerant gas leaks and additional charging is
carried out, the composition of the refrigerant in the
system will change and may lead to
insufficientperformance, etc. Thus, recover all
Three Rules for Refrigerant
Piping Construction
Special caution that differs from other building facility
piping is required for the refrigerant piping. If these
cautions are ignored, trouble could occur. When
constructing the refrigerant piping, exercise special care
to make sure that the inside of the pipe is "dry", "clean"
and "tight". These three items are the "three rules for
refrigerant piping construction".
For the other refrigerant piping materials, use the JIS H
3300 "Copper Pipe and Steel Alloy Seamless Pipe" C
1220 type copper pipe. The pressure is somewhat higher
than the conventional refrigerant , so select a copper
pipe with a thickness that corresponds to the new
refrigerant and can withstand the pressure.
1. Type of refrigerant charged in product
Old refrigerant = R22, New refrigerant = R407C
2. Confirmation of construction place and specifications
Secure the construction members and tool installation place.
3. Confirmation of required tools
The tools must be used according to the type of refrigerant.
Never use the gauge manifold, charge hose, charge cylinder
R407C Refrigerant Precautions for Servicing and Construction
R407C Refrigerant Points for Piping Construction
Ester oil
Conventional refrigerant HCFC22
(single refrigerant)
Condensing
pressure
1.84MPa (18.8kg/cm
2
)
MIneral oil
New refrigerant HFC407C
(3-liquid compound refrigerant)
2.01MPa (20.5kg/cm
2
)
Synthetic oil (poly olester
)
Refrigerant
R407C Refrigerant Construction Procedures
Dry
There is no water inside
Clean
There is no dirt inside
Tight
There is no refrigerant leakage
Items
Cause
Generated
symptoms
Prevention
measures
*Water, such as rain water, enters from outside
*Water forms due to condensation in the piping
*Oxidization film during brazing
*Foreign matter, such as dirt dust or oil,
enters from outside
*Insufficient brazing
*Incorrect flare machining or tightening
torque control
*Clogging of the expansion valve or capillary
tubes, etc.
*Failure to cool or heat
*Deterioration of lubrication oil
*Failure of compressor
*Clogging of the expansion valve or capillary
tubes, etc.
*Failure to cool or heat
*Deterioration of lubrication oil
*Failure of compressor
*Insufficient gas
*Failure to cool or heat
*Rise of discharge gas temperature
*Deterioration of lubrication oil
*Failure of compressor
*Same as left
*Do not use devices used with other refrigerant
*Follow the basic brazing work
*Follow the basic flare machining work
*Follow the basic flange connection work
*Carry out tightness test (gas leakage)
Three Rules for Refrigerant Piping Construction
Piping maintenance
Vacuum drying
Flushing
Precautions (1) All devices will change to the new refrigerant to prevent ozone layer destruction and global warning.
(2) As the properties of the each refrigerant differ, the specifications differ greatly. Refer to the manuals issued by each maker.
Table of usage possibilities
(
R407C
)
Gauge manifold
Charge hose
Charge cylinder
Gas leakage detector
Vacuum pump
Pump with back flow prevention
The pressure increases, and the fitting specifications have been changed.
Not compatible with current part
HFC compliance is required as chlorine is not contained
x
x
x
Common with 134a
Possibility of
conventional
device use
Remarks
Usable if backflow preventing adaptor (for refrigerant) is installed
Table of usage possibilities
(
R407C
)
Flare tool
Bender
Refrigerant cylinder
Torque wrench
Cutter, reamer
Welder, nitrogen cylinder
The refrigerant name is described on the outside, and the paint color has been changed
R407C
Possibility of
conventional
device use
Remarks
Water Dirt
Leak
15
Copper pipe outer diameter
Copper
pipe
thickness
Conventional refrigerant HCFC22
New refrigerantHFC407C
Refrigerant piping thickness comparison table
When selecting and laying the copper pipe, always observe the "Refrigerant Safety Rules Related Standards".
p6.4mm
0.8mm
0.8mm
p9.5mm
0.8mm
0.8mm
p12.7mm
1.0mm
1.0mm
p15.9mm
1.0mm
1.0mm
p19.1mm
1.0mm
1.2mm
p22.2mm
1.2mm
1.4mm
p25.4mm
1.4mm
1.4mm
or vacuum pump with other refrigerants. Always carry
out the work with dedicated tools. (Failure to do so
could lead to trouble.)
4. Confirmation of connection piping (Set
length piping, long length piping)
Use the JIS specified piping (Refer to the Refrigerant
piping thickness comparison table) to handle the new
refrigerant. Confirm that the piping end has been treated
(cap or tape) for the long piping. When using recessed
piping construction, always cover the pipe end (with
cap or tape).
take extra special care in controlling the water content
and contaminants.
2. Ester oil is used for the lubrication oil. If the
conventional oil (barrel freeze, Suniso, etc. ) mixes in,
sludge will form. Thus, always use dedicated tools for
the gauge manifold, charge hose, etc.
refrigerant in the system to the outside, and recharge the
specified amount of refrigerant.
1. Confirmation before construction
1. Contaminants
2. Gas leakage
3. Refrigerant piping material
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