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.”

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.

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: in. (mm)

Material

 

 

O

 

 

 

 

 

 

 

 

 

Copper tube

Outer diameter

1/4 (6.35)

3/8 (9.52)

1/2 (12.7)

5/8 (15.88)

3/4 (19.05)

 

 

 

 

 

 

Wall thickness

1/32 (0.8)

1/32 (0.8)

1/32 (0.8)

5/128 (1.0)

5/128 (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 of 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.

 

New

R407C tools

 

Item

compatible

Remarks

tool?

 

with R410A?

 

 

 

 

 

Manifold gauge

Yes

No

Types of refrigerant, refrigerating machine oil, and

 

 

 

pressure gauge are different.

 

 

 

 

Charge hose

Yes

No

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

No

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.

 

 

 

 

Flaring oil

Yes

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.

 

 

 

 

Manifold gauge

Vacuum pump

Outlet

Inlet

* Using tools for R22 and R407C and new tools for R410A together can cause defects.

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Sanyo 85464359981002 Care regarding tubing, Be sure to recharge the refrigerant only in liquid form

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