13
Precautions for Installation Using New Refrigerant
1. Care regarding tubing
1-1. Process tubing
Material: Use seamless phosphorous deoxidized copper tube for refrigeration. Wall thickness shall comply with the applicable
legislation. The minimal wall thickness must be in accordance with the table below.
Tubing size: Be sure to use the sizes indicated in the table below.
For the renewal tubing size, refer to the Technical Data.
Use a tube cutter when cutting the tubing, and be sure to remove any flash. This also applies to distribution joints (optional).
When bending tubing, use a bending radius that is 4 times the outer diameter of the tubing or larger.
CAUTION
Use sufficient care in handling the tubing. Seal the tubing ends with caps or tape to prevent dirt,
moisture, or other foreign substances from entering. These substances can result in system
malfunction.
Unit: mm
Material
Temper - O (Soft copper tube)
Copper tube
Outer diameter
6.35
9.52
12.7
15.88
Wall thickness
0.8
0.8
0.8
1.0
1-2. Prevent impurities including water, dust and oxide from entering the tubing. Impurities can cause R32 refrigerant deterioration
and compressor defects. Due to the features of the refrigerant and refrigerating machine oil, the prevention of water and other
impurities becomes more important than ever.
2. Be sure to recharge the refrigerant only in liquid form.
2-1. Since refrigerant composition changes and performance decreases when gas leaks, collect the remaining refrigerant and recharge
the required total amount of new refrigerant after fixing the leak.
3. Different tools required
3-1. Tool specifications have been changed due to the characteristics of R32.
Some tools for R22- and R407C-type refrigerant systems cannot be used.
Item
Different tools?
(From R22 and
R407C)
R410A tools
compatible
with R32?
Remarks
Manifold gauge
Manifold gauge
Yes
Yes
Types of refrigerant, refrigerating machine oil,
and pressure gauge are different.
Charge hose
Yes
Yes
To resist higher pressure, material must be
changed.
Vacuum pump
Yes
Yes
Use a conventional vacuum pump if it is
equipped with a check valve. If it has no check
valve, purchase and attach a vacuum pump
adapter.
Leak detector
Yes
Yes
Leak detectors for CFC and HCFC that react
to chlorine do not function because R32 and
R410A contains no chlorine. Leak detectors for
HFC can be used for R32 and R410A.
Vacuum pump
Outlet
Inlet
Flaring oil
Yes
Yes
For systems that use R22, apply mineral oil
(Suniso oil) to the flare nuts on the tubing to
prevent refrigerant leakage. For machines that
use R32 or R410A, apply synthetic oil (ether
oil) to the flare nuts.
* Using tools for R22 and R407C can cause defects.
Single-outlet valve
(with siphon tube)
Liquid refrigerant should be
recharged with the cylinder
standing on end as shown.
Valve
Liquid
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