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     EDUS39-605-N VRV Installation Handbook

1. Center of Gravity ...............................................................1

2. Foundation Drawing........................................................... 2

3. REFNET Pipe System ...................................................... 3

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Copper Disperse Pipe only for R410A HITACHI size tech drawing

Source: Metal Supermarket

Copper, Brass and Bronze, otherwise known as the “Red Metals”, may look the same initially but are actually quite different.

Source: Wikipedia

Brass is a metal alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.

It is up to the designer to select the type of copper tube for use in a particular application. Strength, formability and other mechanical factors often determine the choice. Plumbing and mechanical codes govern what types may be used. When a choice can be made, it is helpful to know which type of copper tube has and can serve successfully and economically in any given application.

Copper pipe art ideas for home decoration


Cut to the exact length required using a tube cutter or hacksaw. If a hacksaw is used, a sawing fixture should also be used to ensure square cuts. Remove all inside and outside burrs with a reamer, file, or other sharp edge scraping tool. If tube is out of round, it should be brought to true dimension and roundness with a sizing tool.

After the brazed joint has cooled the flux residue should be removed with a clean cloth, brush or swab using warm water. Remove all flux residue to avoid the risk of the hardened flux temporarily retaining pressure and masking an imperfectly brazed joint. Wrought fittings may be cooled more readily than cast fittings, but all fittings should be allowed to cool naturally before wetting.

Cleaned and capped copper tube,  designed to meet the rigorous demands for cleanliness and consistency in medical gas installations. Paired with our cleaned and degreased copper fittings, we offer customers a complete system of tube and fittings.

Winland offers a complete line of  tube for HVAC and Refrigeration applications. Our process ensures consistent cleanliness and quality that our customers have come to expect of all tube products.

Winland offers high quality seamless red straight copper pipe with factory price. Our products meet the international standards such as ASTM B280, ASTM B68, ASTM B75, ASTM B88, ASTM, B837, ASTM 306, EN 1057.

BEADS OF SWEAT are collecting around the small of your back. Your brain feels like it’s suspended in chicken broth. Your eyelids are droopy, and your skin is hot. If only the windows in your office could be opened. If only one of your co-workers had a fan.

Cooling only systems (less popular) – those systems can only cool. Heating is not available. Fan and Dry modes are available for each indoor unit independently.

Heat Pump systems (most popular) – all the indoor units can either heat, or cool (not at the same time). Fan and Dry modes are available for each indoor unit independently.

Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented in Japan in 1982. Like ductless minisplits VRFs use refrigerant as the cooling and heating medium. This refrigerant is conditioned by a single outdoor condensing unit, and is circulated within the building to multiple fan-coil units (FCUs).

All piping, valves, fittings and other components for use in all non-flammable medical gas systems must be thoroughly cleaned by the manufacturer to remove oil, grease and other readily oxidizable materials as if they were being prepared for oxygen service. Use particular care in storage and handling. Such material must be capped or plugged to prevent recontamination before final assembly. Just prior to final assembly, the material must be examined internally for contamination.

Designing a copper tube water supply system is a matter of determining the minimum tube size for each part of the total system by balancing the interrelationships of six primary design considerations:

  • Available main pressure;
  • Pressure required at individual fixtures;
  • Static pressure losses due to height;
  • Water demand (gallons pter minute) in the total system and in each of its parts;
  • Pressure losses due to the friction of water flow in the system;
  • Velcity limitations based on noise and erosion.

A table indicates copper pipe's types, standards and applications.

Thermal conductivity (k, also denoted as λ or κ) is a measure of a material's ability to conduct heat. Heat transfer across materials of high thermal conductivity occurs at a higher rate than across materials of low thermal conductivity. In the International System of Units (SI), thermal conductivity is measured in watts per meter Kelvin (W/(m•K)). In the Imperial System of Measurement (British Imperial, or Imperial units), thermal conductivity is measured in Btu/(hr•ft⋅F).

Strong, long lasting, copper tube is the leading choice of modern contractors for plubing, heating and cooling installations in all kinds of residential and commercial buildings. The primary reasons for this are;

Copper is economical.

The combination of easy handling, forming and joining permits savings in installation time, material and overall costs. Long-term performance and reliability mean fewer callbacks, and that makes copper the ideal, cost-effective tubing material.

Copper is lightweight.

This table is in Chinese version, compares the datas of copper straight pipe and coil standards.

You could tell the differences between  international standards includes: GB/T 17791-1999, ASTM B68, ASTM B75, ASTM B280, ASTM B743, JIS H3300.