Secondary surface (fins) are of the plate-fin design using aluminum or copper, with die-formed collars. The fin design is to be flat, waffle, or sine-wave in a staggered tube pattern to meet performance requirements. Fins are to be free of oils and oxidation. Collars will hold fin spacing at the specified density and cover the entire tube surface. Aluminum properties are to be Alloy 1100 per ASTM B209, O (soft) temper. Copper is to be Alloy 11000 per ASTM B152-06 with a soft (anneal) temper.
Coil casing material shall be of G90 galvanized steel, 16 gauge minimum. Heavier material, stainless steel, copper, or aluminum casings are to be provided as required. Intermediate tube supports are to be provided on all coils 50” and longer fin length. Coil casings on the top and bottom of coils are to have double-flange construction, allowing for vertical stacking of coils.
Tubes and return bends shall be constructed from seamless UNS C12200 copper conforming to ASTM B75 and ASTM B743. Properties shall be O50 light annealed, with a maximum grain size of 0.040mm. Seamless tubes are to be mechanically expanded into plate fins to form an everlasting bond between primary and secondary surfaces.
Coils shall be tested at 550 psig using dry nitrogen, submerged underwater. Dual-operator verification shall determine that all coils are leak-free. Coils shall be shipped with nitrogen charge to verify leak-free integrity and to prevent moisture migration into the coil.
Evaporator coils shall be designed with brass liquid distributors (as required) and copper sweat suction connections. Distributors shall be capped using soft-solder for ease of cap removal; suction connections shall be capped.
Headers are to be constructed of seamless UNS C12200, Type L copper material sized to match specified connection size. Headers are to have finished integral spin-closed ends designed to withstand test pressure.
Materials and Specifications
|Fin Material||Aluminum||Optional -Copper; Stainless Steel|
|Casing Material||Galv. Steel 16 gauge||Optional - Galv. Steel 12, 14, 16 and 18 gauge •
304, 316 Stainless Steel 12, 14, and 16 gauge • 14 Gauge aluminum
|Header Material||Copper||Optional - Type K Copper|
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