Mitsubishi Electric SUZ-KA71VA4 Manual de servicio descargar pdf (Pagina 5)

Electronic scale for refrigerant charging

Outdoor unit

Refrigerant gas

cylinder

operating valve

Refrigerant gas cylinder

for R410A with siphon

Refrigerant (liquid)

Service port

Gauge manifold

valve (for R410A)

Union

Liquid pipe

Gas pipe

Stop valve

Indoor unit

Charge hose (for R410A)

R410A

Pipe diameter (mm)

6.35

9.52

12.7

15.88

Dimension of flare nut (mm)

R22

• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less

than 0.8mm, as the pressure resistance is insufficient.

Flaring work and flare nut

Flaring work for R410A pipe differs from that for R22 pipe.

For details of flaring work, refer to Installation manual “FLARING WORK”.

3. Refrigerant oil

Apply the special refrigerant oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.

4. Air purge

Do not discharge the refrigerant into the atmosphere.

Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant

circuit.

Use the vacuum pump for air purging for the purpose of environmental protection.

5. Additional charge

For additional charging, charge the refrigerant from liquid phase of the gas cylinder.

If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and

the outdoor unit. In this case, ability of the refrigerating cycle decreases or normal operation can be impossible. However,

charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.

2. Refrigerant piping

Specifications

Use the refrigerant pipes that meet the following specifications.

Wall thicknessOutside diameter

Pipe

mm mm

For liquid

For gas

6.35

9.52

12.7

15.88

0.8

1.0

Heat resisting foam plastic

Specific gravity 0.045

Thickness 8 mm

Insulation material

OCH545

1 2 3 4 5 6 7 8 9 10 ... 45 46

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Mitsubishi Electric SUZ-KA71VA4 Manual de servicio Pagina 5

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