Toshiba RAS-24UKHP-ES-1 Service Manual page 35

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)
• 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)
New tools for R410A
New tools for R410A
Gauge manifold
Charge hose
Electronic balance
for refrigerant charging
Torque wrench
(nominal dia. 1/2, 5/8)
Flare tool
(clutch type)
Gauge for projection
flare adjustment
Vacuum pump adapter
Gas leakage detector
• Incidentally, the "refrigerant cylinder" comes with the refrigerant designation (R410A) and protector coating in
the U. S's ARI specified rose color (ARI color code: PMS 507).
• Also, the "charge port and packing for refrigerant cylinder" require 1/2 UNF 20 threads per inch
corresponding to the charge hose's port size.
Applicable to R22 model
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FILE NO. SVM-03009
Changes
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.
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.
As pressure is high and gasification speed is fast,
it is difficult to read the indicated value by means
of a charging cylinder, as air bubbles occur.
The size of opposing side of flare nuts have been
increased.
Incidentally, a common wrench is used for nominal
diameters 1/4 and 3/8.
By increasing the clamp bar's receiving hole,
strength of spring in the tool has been improved.
Used when flare is made by using conventional
tool.
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 oil (mineral) mixes with R410A,
a sludge may occur and damage the equipment.
Exclusive for HFC refrigerant.