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38VYX050/38VYX080
GB - 12
Final installation checks
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, 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 resisting strength of the
refrigerant piping flare processing diameter and size of opposite
side of flare nuts has been changed. (for copper pipes with
nominal dimensions 1/2 and 5/8)
• 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.
Table: New tools for R410A
New tools for R410A Applicable to R22 model Changes
As pressure is high, it is impossible to measure by means of conventional
Gauge manifold x gauge. In order to prevent any other refrigerant from being charged, each
port diameter is changed.
In order to increase pressure resisting strength,
Charge hose x hose materials and port size are changed (to 1/2 UNF 20 threads per
inch). When purchasing a charge hose, be sure to check the port size.
As pressure is high and gasification speed is fast, it is difficult
Electronic balance o to read the indicated value by means of charging cylinder, as air bubbles
for refrigerant charging
occur.
Torque wrench
x
The size of opposite sides of flare nuts have been increased. Incidentally,
(nominal diam. 1/2, 5/8) a common wrench is used for nominal diameters 1/4 and 3/8.
Flare tool
o
By increasing the clamp bar’s receiving hole, strength of spring in the tool
(clutch type) has been improved.
Gauge for projection
--
adjustment
Used when flare is made with using conventional flare tool.
Connected to the conventional vacuum pump. It is necessary to use an
adapter to prevent vacuum pump oil from flowing back to the charge hose.
Vacuum pump o The charge hose connecting part has two ports-one for conventional
adapter
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.
Gas leakage detector x Exclusive for HFC refrigerant.