d. R410A refrigerating machine oil
Conventionally, mineral oil or a synthetic oil such as alkylbenzene has been used for R22 refrigerating machine
oil. Because of the poor compatibility between R410A and conventional oils like mineral oil, however, there is a
tendency for the refrigerating machine oil to collect in the refrigerating cycle. For this reason, polyester and
other synthetic oils which have a high compatibility with R410A are used as refrigerating machine oil.
Because of the high hygroscopic property of synthetic oil, more care must be taken in its handling than was
necessary with conventional refrigerating machine oils. Also, these synthetic oils will degrade if mixed with
mineral oil or alkylbenzene, causing clogging in capillary tubes or compressor malfunction. Do not mix them
under any circumstances.
10.1.2
Safety Measure When Installing / Receiving Refrigerant Piping
Cause the gas pressure of R410A is approximately 1.6 times as high as that of R22, a mistake in installation or
servicing could result in a major accident. It is essential that you use R410a tools and materials, and that you
observe the following precautions to ensure safety.
Do not use any refrigerant other than R410A in Acs that have been used with R410A.
If any refrigerant gas leaks while you are working, ventilate the room. Toxic gas may be generated if refrigerant
gas is exposed to a direct flame.
When installing or transferring an AC, do not allow any air or substance other than R410A to mix into the
refrigeration cycle. If it does, the pressure in the refrigeration cycle can become abnormally high, possibly
causing an explosion and/or injury.
After finishing the installation, check to make sure there is no refrigerant gas leaking.
When installing or transferring an AC, follow the instructions in the installation instructions carefully. Incorrect
installation can result in an abnormal refrigeration cycle or water leakage, electric shock, fire, etc.
Do not perform any alterations on the AC unit under any circumstances. Have all repair work done by a specialist.
Incorrect repairs can result in an water leakage, electric shock, fire, etc.
10.2. TOOL FOR INSTALLING / SERVICING REFRIGERANT PIPING
10.2.1
Necessary Tools
In order to prevent an R410A AC from mistakenly being charged with any other refrigerant, the diameter of the 3-way
valve service port on the outdoor unit has been changed. Also, to increase its ability to withstand pressure, the
opposing dimensions have been changed for the refrigerant pipe flaring size and flare nut. Accordingly, when
installing or servicing refrigerant piping, you must have both the R410A and ordinary tools listed below.
1.
2.
3.
4.
5.
6.
Type of work
Flaring
Bending, connecting pipes
Air purging
Gas leak inspection
Table 3 Tools for installation, transferring or replacement
Ordinary tools
R410A tools
Flaring tool (clutch ty pe), pipe cutter, reamer
To rque wrenc h (nominal diam eter 1/4,
3/8,1/2) Fixed spanner (op posing sides 12
mm, 17 mm, 19 mm) Adjustable wrench,
Spring bender
Va cuum pump Hexagonal wrench
(opposing side s 4 mm)
Gas leak inspection fluid or soapy water
Copper pipe gauge for clearance
Adjustment, flaring tool (clutc h type)*1)
Manifold gauge, charging hose, vac uum
pump adaptor
Electric gas leak detector for HFC
refrigerant*2)
*1) You can use the conventional (R22) flaring tool. If you need to buy a new tool, buy the R410A type.
*2) Use when it is necessary to detect small gas leaks.
*For other installation work, you should have the usual tools, such as screwdrivers (+,-), a metal-cutting saw, an
electrical drill, a hole core drill (65 or 70 dia.), a tape measure, a level, a thermometer, a clamp meter, an insulation
tester, a voltmeter, etc.
Table 4 Tool for serving
Type of work
Ordinary tools
R410A tools
Refrigerant charging
Brazing (Replacing refrigerating
cycle part*1)
Nitrogen blow s et (be sure to use nitrogen
blo wing for all brazing), and brazing), and
brazing m achine
Elec tronic scale for refrigerant charging
Refrigerant cylinder Charging orifice and
packing for refrigerant cylinder
*1) Always replace the dryer of the outdoor unit at the same time. The replacement dryer is wrapped in a vacuum
pack. Replace it last among the refrigerating cycle parts. Start brazing as soon as you have opened the vacuum pack,
and begin the vacuuming
40
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