Secondary surface (fins) shall be of the plate-fin design using aluminum or copper, with die-formed collars. Fin design to be flat, waffle, or sine-wave in a staggered tube pattern to meet performance requirements. Collars will hold fin spacing at specified density, and cover the entire tube surface. Fins are to be free of oils and oxidation.
Seamless copper tubes shall be mechanically expanded into plate aluminum or copper fins to form an everlasting bond between primary and secondary surfaces. Tubes are to be mechanically expanded into fins (secondary surface) for maximum heat transfer.
Headers (manifolds), shall be constructed of a minimum .060” wall seamless copper. Die-formed copper end caps are brazed on the inside of the headers, unless spun-closed (for sizes up to 1-3/8”). Steam Distributing coils shall utilize a header within a header design to facilitate freeze protection.
Connection is to be sweat type (SWT), MPT or FPT Grooved or flanged as required. Connections shall be sized to accommodate supply steam and condensate loads.
Coil casing material shall be galvanized steel at a 16 gauge minimum. Heavier material, stainless steel, copper or aluminum casings are available as required.
Intermediate supports are required on all coils 48″ of finned length and longer. Coil casings on top and bottom of coils are to have double-flange construction, allowing for vertical stacking of coils.
Coils shall be tested at 550 psig using dry nitrogen, submerged under water. Dual-operator verification shall determine that all coils are leak-free.
Steam coils are guaranteed up to a maximum 150 psig saturated steam supply pressures with appropriate wall thickness.
All fluid coils designed with 1/2” or 5/8” tubes are to have ARI Standard 410 certification and shall bear the ARI symbol. Coils outside the scope of ARI’s standard rating conditions or certification program will be acceptable to ARI since USA Coil is a current member of the ARI coil certification program, and coils will be rated in accordance with the ARI Standard 410.
Standard/Base in Bold Below
Standard / Optional
|Fin Material||Aluminum||Copper; Stainless Steel|
|Casing Material||Galv. Steel 16 gauge||Galv. Steel 14 gauge
Stainless Steel 16 gauge
|Copper||Steel • Red Brass|
|Tube Material||Copper||Stainless Steel • Cupro Nickel • Carbon Steel|
|Header Material||Copper||SS Tube will have SS HDR(s) • Cupro Nickel Tubes will have Cupro Nickel HDR(s) • Carbon Steel Tubes will have Carbon Steel HDR(s)|
Most HVAC steam heating coils operate with steam pressure below 25 PSIG, and a very large percentage are below 15 PSIG.......