Precautions For Installation Using New Refrigerant - Panasonic U-72MF1U9 Installation Instructions Manual

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 ø7/8" (ø22.22 mm) 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 suffi cient 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
Copper tube
Wall thickness
Material
Outer diameter
Copper tube
Wall thickness
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.
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.
R407C tools
New
Item compatible
tool?
with R410A?
Manifold gauge Yes No
Charge hose Yes No
Vacuum pump Yes Yes
Leak detector Yes No
Flaring oil Yes No
* Using tools for R22 and R407C and new tools for R410A together can cause defects.
1/4 (6.35) 3/8 (9.52) 1/2 (12.7)
1/32 (0.8) 1/32 (0.8) 1/32 (0.8)
7/8 (22.22) 1 (25.4) 1-1/8 (28.58) 1-1/4 (31.75)
5/128 (1.0) 5/128 (1.0) 5/128 (1.0)
Remarks
Types of refrigerant, refrigerating machine oil, and
pressure gauge are different.
To resist higher pressure, material must be changed.
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 detectors for CFC and HCFC that react to
chlorine do not function because R410A contains no
chlorine. Leak detector for HFC134a can be used for
R410A.
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.
4
Unit: in. (mm)
O
5/8 (15.88) 3/4 (19.05)
5/128 (1.0) over 5/128 (1.0)
1/2 H, H
1-1/2 (38.1)
3/64 (1.1) over 3/64 (1.15) over 3/64 (1.20)
Manifold gauge
Vacuum pump
Unit: in. (mm)
1-5/8 (41.28)
Outlet
Inlet