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FILE NO. SVM-05020
8-3-3. Installation/Servicing tools
<Changes in the product and components>
In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being charged
accidentally, the service port diameter of the outdoor unit control valve (3 way valve) has been changed. (1/2
UNF 20 threads per inch)
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In order to increase the pressure withstand strength of the refrigerant piping, flare processing diameter and
size of opposite side of flare nuts have been changed. (for copper pipes with nominal dimensions 1/2 and 5/8)
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Incidentally, the "refrigerant cylinder" comes with the refrigerant designation (R410A) and protector coating in
the U. S ARI specified rose color (ARI color code: PMS 507).
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Also, the "charge port and packing for refrigerant cylinder" require 1/2 UNF 20 threads per inch
corresponding to the port size of the charge hose.
New tools for R410A
Applicable to R22 model
Changes
Gauge manifold
As pressure is high, it is impossible to measure by
means of conventional gauge. In order to prevent
any other refrigerant from being charged, each
port diameter has been changed.
Charge hose
In order to increase pressure withstand strength,
hose materials and port size have been changed
(to 1/2 UNF 20 threads per inch).
When purchasing a charge hose, be sure to
confirm the port size.
Electronic balance
As pressure is high and gasification speed is fast,
for refrigerant charging
it is difficult to read the indicated value by means
of a charging cylinder, as air bubbles occur.
Torque wrench
The size of opposing flare nuts has been increased.
(nominal dia. 1/2, 5/8)
Incidentally, a common wrench is used for nominal
diameters 1/4 and 3/8.
Flare tool
By increasing the clamp bar's receiving hole,
(clutch type)
strength of spring in the tool has been improved.
Gauge for projection
Used when flare is made with a conventional flare
adjustment
tool.
Vacuum pump adapter
Connected to conventional vacuum pump. It is
necessary to use an adapter to prevent vacuum
pump oil from flowing back to the charge hose.
The charge hose connecting part has two ports:
one for conventional refrigerant (7/16 UNF 20
threads per inch) and one for R410A. If the
vacuum pump mineral oil mixes with R410A,
a sludge may occur and damage the equipment.
Gas leakage detector
Exclusive for HFC refrigerant.
