7 EVACUATING

AIR PURGE

Evacuate the air in the connecting pipes and in the indoor unit using vacuum pump.

Do not use the refrigerant in the outdoor unit. For details, see the manual of vacuum pump.

Use a vacuum pump

Be sure to use a vacuum pump with counter-flow prevention function so that inside oil of the pump does not flow backward into pipes of the air conditioner when the pump stops.

1.Connect the charge hose from the manifold valve to the service port of the gas side packed valve.

2.Connect the charge hose to the port of vacuum pump.

3.Open fully the low pressure side handle of the gauge manifold valve.

4.Operate the vacuum pump to start evacuating.

Perform evacuating for about 35 minutes if the piping length is 30 meters total for model SM560 and 50 meters for model SM800, SM1100, SM1400 (assuming a pump capacity of 27 liters per minute.) Then confirm that the compound pressure gauge reading is –101 kPa ( –76 cmHg).

5.Close the low pressure side valve handle of gauge manifold.

6.Open fully the valve stem of the packed valves (both sides of Gas and Liquid).

7.Remove the charging hose from the service port.

8.Securely tighten the caps on the packed valves.

Open valve fully

Open valves of the corresponding outdoor units fully.

Gas leak check

Using a lead detector or soap water, check there is no gas leak from pipe connecting portion or caps of the valves.

REQUIREMENT

For a leak detector, use one manufactured exclusively for HFC refrigerant (R410A, R134a, etc.)

Thermal-insulating process

Perform pipe thermal-insulating process for liquid and gas sides separately.

•For thermal insulator to pipes at gas side, use one with heat resisting temperature 120°C or higher.

•Using the attached thermal insulator, perform surely thermal insulation without gap for pipe connecting portion of the indoor unit.

REQUIREMENT

Perform surely thermal insulation process so that the naked end of pipe connecting portion of the indoor unit does not appear.

(Exposure of the pipe may cause water leak.)

Packed valve handling precautions

•Open the valve stem all the way out ; do not try to open it beyond the stopper.

•Securely tighten the valve stem cap at the torque as follows:

15.9 mm (diam.)

68 to 82 N•m (6.8 to 8.2 kgf•m)

 

 

12.7 mm (diam.)

50 to 62 N•m (5.0 to 6.2 kgf•m)

 

 

9.5 mm (diam.)

33 to 42 N•m (3.3 to 4.2 kgf•m)

 

 

6.4 mm (diam.)

14 to 18 N•m (1.4 to 1.8 kgf•m)

 

 

Hexagonal wrench is required.

Main unit

Union

Flare nut

Pipe thermal

Attached thermal insulator

insulator

 

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Toshiba R410A service manual Open valve fully, Gas leak check, Use a vacuum pump, Packed valve handling precautions
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R410A specifications

Toshiba R410A is a highly regarded refrigerant known for its efficiency and environmental benefits. This hydrofluorocarbon (HFC) mixture is widely used in various air conditioning and refrigeration applications due to its excellent thermodynamic properties. One of the standout features of R410A is its superior energy efficiency, which contributes to lower energy consumption and reduced CO2 emissions in HVAC systems.

One significant advantage of R410A over older refrigerants, such as R22, is its lower ozone depletion potential (ODP). R410A has an ODP of zero, making it a more environmentally friendly choice. This characteristic aligns with global initiatives aimed at protecting the ozone layer and promoting sustainable practices. The shift to R410A has been supported by government regulations in many countries, phasing out older, more harmful refrigerants.

Toshiba has incorporated advanced technologies in its R410A compatible products, enhancing performance and reliability. Among these technologies is the inverter technology that allows the compressor to operate at variable speeds. This functionality leads to improved temperature regulation, reduced noise levels, and further energy savings. Inverter systems provide precise control over the cooling and heating processes, allowing for a comfortable indoor environment while minimizing wastage of energy.

R410A also exhibits excellent heat transfer properties, which boosts cooling capacity. This feature makes it suitable for large-scale HVAC systems, including commercial and industrial applications. Its high-pressure characteristics enable the design of more compact and efficient components, allowing for smaller units and easier installation.

Furthermore, Toshiba's dedication to technological innovation is visible in its commitment to research and development. The company continuously strives to optimize systems that utilize R410A, focusing on reliability and longevity. This includes improved compressor designs, enhanced heat exchangers, and the integration of smart controls that adapt to the varying load conditions in real-time.

In terms of safety, R410A is classified as non-toxic and non-flammable under normal conditions, making it a safe choice for use in residential and commercial settings. However, it is important to note that R410A operates at higher pressures compared to traditional refrigerants, necessitating proper equipment design and handling procedures.

In conclusion, Toshiba R410A stands out in the market for its energy efficiency, environmental safety, and technological advancements. It is an ideal refrigerant for modern HVAC applications, contributing to both comfort and sustainability. As the industry continues to evolve, R410A remains a pivotal element in the quest for responsible and efficient refrigeration solutions.
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