●Do not use a spanner to tighten the valve stem caps. Doing so may damage the valves.

●Depending on the installation conditions, applying excessive torque may cause the nuts to crack.

Precautions for Packed Valve Operation

●If the packed valve is left for a long time with the valve stem cap removed, refrigerant will leak from the valve. Therefore, do not leave the valve stem cap removed.

●Use a torque wrench to securely tighten the valve stem cap.

●Valve stem cap tightening torque:.

Packed valve

Charging port

Valve stem

Main valve

Valve stem cap

Fig. 5-8

Two tubes arranged together

Charging port

8 – 10 Nm (80 - 100 kgfcm)

 

 

 

9,52 mm (Narrow side)

19 – 21 N m

(190 - 210 kgf cm)

 

 

 

15,88 mm (Wide side))

28 – 32 N m

(280 - 320 kgf cm)

 

 

 

5-3. Insulating the Refrigerant Tubing

Tubing Insulation

●Thermal insulation must be applied to all unit tub- ing, including distribution joint (purchased sepa- rately).

*For gas tubing, the insulation material must be heat resistant to 120°C or above. For other tubing, it must be heat resistant to 80°C or above.

Insulation material thickness must be 10 mm or greater.

If the conditions inside the ceiling exceed DB 30°C and RH 70%, increase the thickness of the gas tubing insulation material by 1 step.

Inter-unit control wiring

Sealer

Unit side insulator

Flare nut

Wide tube

Narrow tube

Armoring tape

Insulation

Fig. 5-9

Insulation tape

Flare insulator

Tube insulator Heat resistant 120°C or above

Vinyl clamps

CAUTION

Taping the flare nuts

If the exterior of the outdoor unit valves has been finished with a square duct covering, make sure you allow suffi- cient space to use the valves and to allow the panels to be attached and removed.

 

Fig. 5-10

 

Refrigerant tubing and insulator

Drain insulator

(not supplied)

Drain pipe and insulator

and clamp.

Large

(not supplied)

(supplied)

 

Wind the white insulation tape around the flare nuts at the wide tube connections. Then cover up the tubing connections with the flare insulator, and fill the gap at the union with the supplied black insulation tape. Finally, fasten the insulator at both ends with the sup- plied vinyl clamps. (Fig. 5-10)

Insulation material

The material used for insulation must have good insu- lation characteristics, be easy to use, be age resis- tant, and must not easily absorb moisture.

After a tube has been insu-

lated, never try to bend it

CAUTION into a narrow curve because it can cause the tube to break or crack.

Packing

 

 

clamp.

 

Insulation

Small

 

tape

hose band

 

Vinyl

(supplied)

 

Flare

clamp

 

 

insulator

 

Seal

 

 

The procedure used for

 

installing the insulator for

 

both wide and narrow

 

tubes is the same.

Fig. 5-11

Never grasp the drain or refrigerant connecting outlets when moving the unit.

14

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Image 14
Sanyo R410A operation manual Precautions for Packed Valve Operation, Two tubes arranged together, Insulation material
Page 13 Page 15

R410A specifications

Sanyo R410A is a refrigerant blend that has gained popularity in air conditioning and refrigeration systems due to its efficiency and environmental benefits. Comprised of two main components, difluoromethane (R-32) and pentafluoroethane (R-125), R410A is categorized as an HFC (hydrofluorocarbon) refrigerant. One of its main advantages is its zero ozone depletion potential, making it an eco-friendly alternative to older refrigerants like R22, which are being phased out due to their harmful effects on the ozone layer.

One of the key features of Sanyo R410A is its high efficiency, which translates to lower energy consumption in air conditioning applications. The thermodynamic properties of R410A allow for higher cooling capacity and reduced energy input, yielding higher seasonal energy efficiency ratios (SEER) compared to R22 systems. This efficiency is not just beneficial for users looking to save on energy bills, but it also contributes to a reduced carbon footprint.

The blend's higher pressure capabilities allow manufacturers to design more compact and lightweight systems, which can lead to better utilization of space in residential and commercial settings. These space-saving designs are often equipped with advanced technologies such as inverter-driven compressors, which adjust their operating speed based on the cooling demand, further enhancing system efficiency.

Sanyo R410A also features excellent thermal properties, providing effective cooling performance across a range of ambient temperatures. The refrigerant has a lower volatility compared to older alternatives, which contributes to improved system stability and reliability over time. Additionally, R410A does not contribute to global warming to the extent of previous refrigerants, although its global warming potential is still a consideration for the future.

Among its technological advancements, Sanyo R410A enables the use of innovative HVAC systems that employ enhanced heat exchange methods. These systems often include microchannel coils that improve heat transfer efficiency while reducing refrigerant charge. The compatibility of R410A with various components allows manufacturers to push the boundaries of design and functionality in climate control systems.

In conclusion, Sanyo R410A stands out due to its exceptional efficiency, environmentally friendly characteristics, and compatibility with advanced technologies. As the HVAC industry continues to evolve, R410A's features and properties position it as a reliable choice for modern air conditioning and refrigeration applications. Its adoption marks a significant step towards achieving greater energy efficiency and sustainability in climate control solutions.
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