(3)Pressurize the system up to 4.15 MPa

(42 kgf/cm2G) with dry nitrogen gas and close the cylinder valve when the gauge reading reaches 4.15 MPa (42 kgf/cm2G). Then, test for leaks with liquid soap.

To avoid nitrogen entering the CAUTION refrigerant system in a liquid

state, the top of the cylinder must be higher than the bottom when you pressurize the system. Usually, the cylinder is used in a vertical standing position.

(4)Do a leak test of all joints of the tubing (both indoor and outdoor) and both gas and liquid service valves. Bubbles indicate a leak. Wipe off the soap with a clean cloth after the leak test.

(5)After the system is found to be free of leaks, relieve the nitrogen pressure by loosening the charge hose connector at the nitrogen cylinder. When the system pressure is reduced to normal, disconnect the hose from the cylinder.

2. Evacuation

Be sure to use a vacuum pump that includes a function for prevention of back-flow, in order to prevent back-flow of pump oil into the unit tubing when the pump is stopped.

Pressure gauge

Gas tube

Liquid tube

1. Specifications

Manifold valve

Lo Hi

Vacuum pump

Open

1

Close

Outdoor unit

Close

Perform vacuuming of the indoor unit and tubing. Connect the vacuum pump to the gas tube valve and apply vacuum at a pressure of –101kPa ( –755 mmHg, 5 Torr) or below.

Continue vacuum application for a minimum of 1 hour after the pressure reaches –101kPa ( –755 mmHg, 5 Torr).

(1)Attach the charge hose end described in the preceding steps to the vacuum pump to evacuate the tubing and indoor unit. Confi rm that the “Lo” knob of the manifold valve is open. Then, run the vacuum pump.

(2)When the desired vacuum is reached, close the “Lo” knob of the manifold valve and turn off the vacuum pump. Confi rm that the gauge pressure is under –101kPa ( –755 mmHg, 5 Torr) after 4 to 5 minutes of vacuum pump operation.

CAUTION

Use a cylinder specifically

designed for use with R410A.

 

 

Fig. 1-125

1-123

Page 128 Page 130
Page 129
Image 129
Panasonic service manual Evacuation, Use a cylinder specifically, Designed for use with R410A
Page 128 Page 130

R410A specifications

Panasonic R410A is a refrigerant that has gained significant popularity in the air conditioning and refrigeration industry due to its favorable environmental properties and performance characteristics. Specifically designed to replace the harmful R22 refrigerant, which is being phased out due to its ozone-depleting potential, R410A offers a more eco-friendly alternative without compromising on efficiency or power.

One of the main features of R410A is its high energy efficiency. It operates at a higher pressure than R22, resulting in better heat transfer capabilities. This increased efficiency translates to lower energy consumption, making units using R410A more cost-effective in the long run. Additionally, R410A is known for its ability to provide excellent cooling performance even in high-temperature environments, making it suitable for a variety of applications, from residential air conditioning systems to commercial refrigeration units.

In terms of composition, R410A is a blend of two hydrofluorocarbons (HFCs), namely R32 and R125. This combination not only minimizes ozone depletion potential (ODP) but also reduces global warming potential (GWP) compared to older refrigerants. Panasonic has emphasized the importance of innovative technologies in its products, and R410A aligns perfectly with the company's commitment to developing sustainable solutions.

Panasonic also integrates advanced technologies to optimize the performance of R410A systems. For example, variable speed compressors, known as inverter technology, enhance system efficiency by adjusting the compressor's speed according to the cooling demand. This ensures that energy is only consumed when needed, further reducing operational costs.

Furthermore, R410A has a wide range of applications, including air conditioning systems, heat pumps, and chillers. Its versatility makes it a popular choice among manufacturers and consumers alike. The refrigerant is also compatible with existing R22 equipment, although specific retrofit procedures must be followed to ensure peak performance and reliability.

In conclusion, Panasonic R410A stands out as an innovative refrigerant choice in the HVAC industry, offering a combination of energy efficiency, environmentally friendly properties, and advanced technologies. As regulatory frameworks continue to tighten on greenhouse gas emissions, R410A and similar refrigerants are expected to play a crucial role in shaping a more sustainable future for air conditioning and refrigeration. Its high performance and lower environmental impact solidify its position as a leading refrigerant in contemporary cooling solutions.
Top Page Image Contents