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CIG Coils – Carefully Crafted

Posted by CIG CRAFT on

CIG, or more commonly known as C.I. Group Public Company Limited, is a Thai manufacturer of coils with over 30 years experience supplying OEM coils to well-known global brands such as Trane, Carrier, York, Fujitsu, LG and many more. It currently owns 3 coil manufacturing facilities in Thailand and is listed in the Stock Exchange of Thailand. It has won many awards from its customers on quality as well as received various certificates such as UL, CSA, and Carrier Q+ Level 3.

CIG makes virtually every type of round tube / plate fin (RTPF) coil and heat exchangers, including water coils, condenser coils, and evaporator coils, for both air conditioning and refrigeration, whether for residential OEM air conditioners or one-off made-to-fit and custom commercial coils. They make transport refrigeration coils, truck and bus air conditioning coils, marine coils, and industrial coils.  CIG carefully craft each coil with quality and care.


Quality Products

CIG uses seamless copper and aluminum tubes mechanically expanded into full collar, aluminum or copper fins.  Their three factories are highly automated, with automated fin press machines, hairpin benders, CNC machines, auto-brazing machinery, as well as the latest testing technology.

Coil Capabilities

CIG’s production can handle almost any coil for both air conditioning and refrigeration: condenser coils, evaporator coils, and fluid coolers.

  • Tube sizes: 5mm, 1/4 inch, 7mm, 5/16 inch (7.94mm), 3/8 inch (9.52mm), 1/2 inch and 5/8 inch
  • Tube thickness: we stock a variety of thicknesses for most tube sizes
  • Tube and fin materials: aluminum, copper, aluminum clad copper, cupro/nickel, and stainless steel
  • Rows: 1 row to 24 rows
  • Fin materials: aluminum and copper, and pre-coated aluminum
  • Fin patterns: we currently offer 13 varieties of fin patterns (see Fin_Pattern_Diagram_PDF)
  • Fin edges: straight edge and ripple edge
  • Fin surfaces:  plain, flat, corrugated, louver, raise lance, sine wave, sine wave slit surface and super slit
  • Fin spacing: 4 FPI to 26 FPI
  • Headers: aluminum, steel, copper, galvanized and stainless steel
  • Protective coatings: hydrophilic protective coated fins, gold, blue, or milk

Coil Selection and Coil Rating

At CIG, a state-of-the-art HVAC coil selection program is used that automatically calculates the optimum size of the coil and number of rows, and fins per inch based on the stated performance requirements. Likewise, a given coil design can be rated for performance, calculating the amount of heat transfer to be achieved. The thoughtful and careful use of the selection program can yield the correct pressure drop at the lowest reasonable cost to fill a particular requirement.

Leak Testing

CIG operates four types of leak testing, including water tank testing, helium sniffer testing, fatigue testing and burst testing. Every coil and connector that we make gets tested for leaks. So you can rest assured that the coil that reaches your hand is of the best quality.
Bubble Leak Test. Every coil is subjected to an underwater bubble leak test at a minimum 380 psi. For higher pressure applications, we apply 600 psi up to 1,000 psi, according to our customer specifications. Tests are normally conducted for 10 minutes to identify leaks in brazing, which are then identified, marked and repaired.

Helium Vacuum Chamber Leak Test. CIG#2 Factory in Chonburi is also equipped with a helium vacuum chamber to test for leaks per customer specification. A coil is placed in the enclosed vacuum chamber and then filled with helium gas. The leak detection is performed by a helium mass spectrometer that can detect even a few nanograms of escaped helium.

Helium Sniffer Leak Test. CIG’s factories are also equipped with portable helium leak detectors. Specifically, they offer, according to customer specifications, full-time leak testing on the factory line by mass spectrometer leak sniffers that are made specifically for the HVAC industry.

Design and Performance Testing

In addition to the daily leak testing that CIG offers for each and every coil, CIG also performs tests on all new designs or specifications, including fatigue testing and burst testing. The industry trend toward smaller aluminum tubes and higher pressure calls for periodic testing to insure confidence in the final product.

If you are interested in the best of coils, feel free to send an email to

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