Panasonic U-8MF1E8 Mode D'emploi page 5

3WAY̲ECO-i̲inst̲eng̲Book.indb 3
Precautions for Installation Using New Refrigerant
1. Care regarding tubing
1-1. Process tubing
● Material: Use C1220 phosphorous deoxidized copper specified in JIS H3300 "Copper and Copper Alloy Seamless Pipes and Tubes."
For tubes of ø25.4 or larger, use C1220 T-1/2H material or H material, and do not bend the tubes.
● Tubing size: Be sure to use the sizes indicated in the table below.
● 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.
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
CAUTION
can result in system malfunction.
Material
Outer diameter 6.35
Copper tube
Wall thickness 0.8
Material
Outer diameter 25.4
Copper tube
Wall thickness 1.0
1-2. Prevent impurities including water, dust and oxide from entering the tubing. Impurities can cause R410A 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 R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and cause defects in the unit.
2-2. 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.
O
9.52 12.7 15.88 19.05
0.8 0.8 1.0 1.2
1/2 H, H
28.58 31.75 38.1
1.0 1.1 over 1.35
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SUPPLEMENT
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3. Different tools required
3-1. Tool specifications have been changed due to the characteristics of R410A.
Some tools for R22- and R407C-type refrigerant systems cannot be used.
Item New tool?
Manifold gauge Yes
Charge hose Yes
Vacuum pump Yes
Leak detector Yes
Unit: mm
22.22
1.15
Flaring oil Yes
Unit: mm
41.28
over 1.45
* Using tools for R22 and R407C and new tools for R410A together can cause defects.
3-2. Use R410A exclusive cylinder only.
R407C tools
compatible Remarks
with R410A?
No Types of refrigerant, refrigerating machine oil,
and pressure gauge are different.
No To resist higher pressure, material must be
changed.
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.
No Leak detectors for CFC and HCFC that react to
chlorine do not function because R410A contains
no chlorine. Leak detectors for HFC134a can be
used for R410A.
No 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 R407C or R410A, apply synthetic oil (ether
oil) to the flare nuts.
Single-outlet valve
(with siphon tube)
Liquid refrigerant should be
recharged with the cylinder
standing on end as shown.
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Manifold gauge
Vacuum pump
Outlet
Inlet
Valve
Liquid