Precautions for Installation Using New Refrigerant
1. Care regarding 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
●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.
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Copper tube | Outer diameter | 1/4 (6.35) | 3/8 (9.52) | 1/2 (12.7) | 5/8 (15.88) |
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Wall thickness | 1/32 (0.8) | 1/32 (0.8) | 1/32 (0.8) | 5/128 (1.0) |
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Unit: in. (mm)
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| 1/ 2 H, H |
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Copper tube | Outer diameter | 7/8 (22.22) | 1 (25.4) | |||||
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Wall thickness | 5/128 (1.0) | 5/128 (1.0) | 5/128 (1.0) | 3/64 (1.1) | over 3/64 (1.15) | over 3/64 (1.20) | ||
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2. Be sure to recharge the refrigerant only in liquid form.
3. Different tools required
| New | R407C tools |
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Item | compatible | Remarks | ||
tool? | ||||
| with R410A? |
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Manifold gauge | Yes | No | Types of refrigerant, refrigerating machine | |
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| oil, and pressure gauge are different. | |
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Charge hose | Yes | No | To resist higher pressure, material must be changed. | |
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Vacuum pump | Yes | Yes | Use a conventional vacuum pump if it is equipped | |
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| with a check valve. If it has no check valve, | |
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| purchase and attach a vacuum pump adapter. | |
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Leak detector | Yes | No | Leak detectors for CFC and HCFC that | |
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| react to chlorine do not function because | |
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| R410A contains no chlorine. Leak detector | |
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| for HFC134a can be used for R410A. | |
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Flaring oil | Yes | No | For systems that use R22, apply mineral oil (Suniso oil) | |
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| to the flare nuts on the tubing to prevent refrigerant | |
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| leakage. For machines that use R407C or R410A, apply | |
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| synthetic oil (ether oil) to the flare nuts. | |
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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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