Manifold gauge Vacuum pump, Leak Test

1-14. LEAK TEST, EVACUATION AND ADDITIONAL REFRIGERANT CHARGE

Perform an air-tightness test for this package A/C. Check that there is no leakage from any of the connections. Air and moisture in the refrigerant system may have undesirable effects as indicated below.

pressure in the system rises

operating current rises

cooling (or heating) efﬁ ciency drops

moisture in the refrigerant circuit may freeze and block capillary tubing

water may lead to corrosion of parts in the refrigerant system

Therefore, the indoor unit and tubing between the indoor and outdoor unit must be leak tested and evacuated to remove any noncondensables and moisture from the system.

1 Air Purging with a Vacuum Pump (for Test Run) Preparation

1. Specifications

Manifold gauge

Fig. 1-122

Vacuum pump

Outlet

Inlet

Fig. 1-123

Manifold valve

Check that each tube (both liquid and gas tubes) between the indoor and outdoor units has been properly connected and all wiring for the test run has been completed.

Remove the valve caps from both the gas and liquid service valves on the outdoor unit. Note that both liquid and gas tube service valves on the outdoor unit are kept closed at this stage.

The refrigerant charge at the time of shipment is only guaranteed sufﬁcient for a tubing length of up to 100 ft. The tubing may exceed this length, up to the maximum permitted length; however, an additional charge is necessary for the amount that the tubing exceeds 100 ft. (No additional refrigerating machine oil is needed.)

1. Leak Test

(1)With the service valves on the outdoor unit closed, remove the 1/4 in. ﬂare nut and its bonnet on the gas tube service valve. (Save for reuse.)

(2)Attach a manifold valve (with pressure gauges) and dry nitrogen gas cylinder to this service port with charge hoses.

Use a manifold valve for air CAUTION purging. If it is not available,

use a stop valve for this purpose. The “Hi” knob of the manifold valve must always be kept closed.

Pressure gauge

Gas tube

Liquid tube

Lo Hi

Charge hose

Cylinder valve

Nitrogen gas cylinder (In vertical standing position)

Open

Outdoor unit

Fig. 1-124

1-122

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.

Panasonic R410A service manual Air Purging with a Vacuum Pump for Test Run Preparation, Leak Test

Models: R410A