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The high side pressure on R410A systems is typically between
30 and 32 bar (425 to 460 psig) and the low side between 8
and 9 bar (115 to 130 psig).
R410A is stable and efficient, from both the compressor and
heat exchanger viewpoint. It gives designers the opportunity
to make equipment more compact, lighter in weight and with
a lower energy consumption so as to achieve a good rating
under the forthcoming Energy Labelling requirements for air
conditioners. In these respects R410A is superior to R407c
for air conditioning applications in smaller systems.
Most R410A air conditioning split systems use pipe line sizes
no greater than 7/8" (generally line sizes are smaller than
for the equivalent R22 system) and refrigeration quality tube
to normal UK spec. is acceptable - thicker walled tube is
not necessary. (see FAQs - air conditioning).
Manufacturers have, in general, retained flare connections.
However it is preferable to use long neck flare nuts (N- rather
than NS-), as these give greater support to the tube so reducing
the risk of flare fracture. Our stock codes for these are
LFFT100 for 1/4", LFFT102 for 3/8", LFFT103 for
1/2", LFFT104 for 5/8", LFFT105 for 3/4".
To ensure a good quality flare joint, a modern flaring tool
such as the ITE type FTE-800 is recommended. This tool has
an eccentric action that rolls out the flare and is torque
limited, so causing less stress to the tube. Our stock code
for this flaring tool is TLT185.
To avoid flaring tubes at all, use swivel flare-to-solder
connectors (KRCY type), which are silver brazed to the pipe
work and enable connection to male flare fittings without
flaring the tube end. Our stock codes for these are LFFT004
for 1/4", LFFT006 for 3/8", LFFT008 for 1/2",
LFFT010 for 5/8".
A dedicated R410A manifold set, fitted with gauges for the
higher pressures, is essential. Heavy duty hoses are also
required, fitted with special connectors, as the traditional
¼" schraeder is replaced by a 5/16" male connection on R410A
units.
Our stock codes for a 2 way dedicated R410A manifold complete
with guages is TLT380 or TLQ41652.
Dedicated R410A hose sets are stocked under codes TLT487
for 36" and TLT489 for 72".
To adapt existing hoses, a straight 1/4" x 5/16"
adaptor is stock code TLT412, whilst an angled one is TLT413.
If you have a modern vac pump this should be OK. Similarly
a recently purchased recovery machine it is also likely to
be R410A compatible; check with the supplier if you are not
sure.
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