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A multiple bank, flattened tube heat exchange unit includes a first tube bank including a plurality of flattened tube segments extending longitudinally in spaced parallel relationship between a first manifold and a second manifold and a second tube bank including a plurality of flattened tube segmen

A multiple bank, flattened tube heat exchange unit includes a first tube bank including a plurality of flattened tube segments extending longitudinally in spaced parallel relationship between a first manifold and a second manifold and a second tube bank including a plurality of flattened tube segments extending longitudinally in spaced parallel relationship between a first manifold and a second manifold, the second tube bank disposed behind the first tube bank. The second manifold of the first tube bank and the second manifold of the second tube bank form a manifold assembly wherein an interior volume of the second manifold of the first tube bank and an interior volume of the second manifold of the second tube bank of the manifold assembly are internally connected in fluid communication.

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1. A multiple bank, flattened tube heat exchange unit comprising: a first tube bank including a first plurality of flattened tube segments extending longitudinally in spaced parallel relationship between a first manifold and a second manifold;a second tube bank including a second plurality of flatte

1. A multiple bank, flattened tube heat exchange unit comprising: a first tube bank including a first plurality of flattened tube segments extending longitudinally in spaced parallel relationship between a first manifold and a second manifold;a second tube bank including a second plurality of flattened tube segments extending longitudinally in spaced parallel relationship between a third manifold and a fourth manifold, the second tube bank disposed behind the first tube bank;the second manifold of the first tube bank and the fourth manifold of the second tube bank forming a manifold assembly wherein an interior volume of the second manifold of the first tube bank and an interior volume of the fourth manifold of the second tube bank of the manifold assembly are connected internally in fluid communication, at least one of the second manifold and the fourth manifold being open longitudinally over a substantially entire length thereof. 2. The multiple bank, flattened tube heat exchange unit as recited in claim 1 wherein the second manifold and the fourth manifold of the second tube bank comprises a pair of separate tubular manifolds, each of said tubular manifolds having an opening in fluid communication with the interior thereof, said tubular manifolds disposed in side-by-side relationship with the respective openings aligned. 3. The multiple bank, flattened tube heat exchange unit as recited in claim 2 further comprising a block insert having a longitudinally extending passage opening there through, said block insert disposed between said tubular manifolds with the respective at least one longitudinally spaced port of each of said tubular manifolds connected in fluid communication to the longitudinally extending passage of said block insert. 4. The multiple bank, flattened tube heat exchange unit as recited in claim 2 further comprising a plurality of tubular members, each tubular member having a first end inserted in a respective one of the plurality of longitudinally spaced ports of the second manifold of the first tube bank, a second end inserted in an aligned one of the plurality of longitudinally spaced ports of the second manifold of the second tube bank, and a circumferential flange extending radially outwardly between the first end and the second end. 5. The multiple bank, flattened tube heat exchange unit as recited in claim 4 wherein a thickness of the circumferential flange is shaped to provide a predetermined spacing between said individual manifolds. 6. The multiple bank, flattened tube heat exchange unit as recited in claim 1 wherein the manifold assembly comprises a fully tubular manifold having a plurality of ports opening to the interior thereof, and a partially open tubular manifold having a longitudinally extending open sector, the partially open tubular member metallurgically bonded to the fully tubular manifold with the plurality of ports opening to the interior of the fully tubular manifold opening in fluid flow communication with the interior of the partially tubular member through the longitudinally open sector of the partially open tubular member. 7. The multiple bank, flattened tube heat exchanger unit as recited in claim 1 wherein the manifold assembly comprises a first partially open tubular manifold having a first longitudinally extending open sector and a second partially open tubular manifold having a second longitudinally extending open sector, the first and second partially open manifolds arranged in interfacing relationship with the first longitudinally open sector aligned with the second longitudinally open sector. 8. The multiple bank, flattened tube heat exchanger unit as recited in claim 7 wherein the first and second partially open tubular manifolds are metallurgically bonded directly to each other with the first longitudinally open sector and the second longitudinally open sector directly opening to each other in fluid communication. 9. The multiple bank, flattened tube heat exchanger unit as recited in claim 7 wherein the each of the first and second partially open tubular manifolds are metallurgically bonded to a common member disposed therebetween with the first longitudinally open sector and the second longitudinally open sector in fluid communication through at least one flow passage defined by the common member. 10. The multiple bank, flattened tube heat exchanger unit as recited in claim 9 wherein the common member is disposed within the interior of the manifold assembly. 11. The multiple bank, flattened tube heat exchange unit as recited in claim 1 wherein the manifold assembly comprises an integral manifold assembly formed from a single sheet folded to form a pair of manifolds. 12. The multiple bank, flattened tube heat exchange unit as recited in claim 11 wherein a plurality of first ports are provided in the single sheet towards a first end of the sheet and a plurality of second ports are provided in the single sheet towards a second end of the sheet, and the sheet is folded upon itself with the plurality of first ports in registration with plurality of second ports. 13. The multiple bank, flattened tube heat exchanger unit as recited in claim 11 wherein the integral manifold assembly is formed from a single sheet clad with a brazing alloy. 14. The multiple bank, flattened tube heat exchanger unit as recited in claim 1 wherein the manifold assembly comprises an integral dual-barrel extruded manifold assembly having a first tubular barrel and a second tubular barrel in spaced parallel relationship and a central web member interconnecting the first and second tubular barrels, the central web member having at least one bore extending transversely therethrough and opening in fluid communication with an interior volume of the first tubular barrel and an interior volume of the second tubular barrel. 15. The multiple bank, flattened tube heat exchanger unit as recited in claim 1 wherein the manifold assembly comprises a flat manifold having a stamped cover plated metallurgically bonded to flat base plate, the flat base plate having a plurality of openings for receiving the plurality of flat tube segments of the first tube bank and a plurality of openings for receiving the plurality of flat tube segments of the second tube bank. 16. The multiple bank, flattened tube heat exchanger unit as recited in claim 15 wherein the cover plate is stamped to form a single chamber interior within the manifold assembly. 17. The multiple bank, flattened tube heat exchanger unit as recited in claim 15 wherein the cover plate is stamped to form a dual chamber interior within the manifold assembly. 18. The multiple bank, flattened tube heat exchanger unit as recited in claim 17 wherein the cover plate is stamped to form at least one flow cross-over passage between a first chamber and a second chamber of the dual chamber interior with the manifold assembly. 19. The multiple bank, flattened tube heat exchanger as recited in claim 1 wherein the manifold assembly comprises an integral folded flat manifold assembly formed from a single folded sheet. 20. The multiple bank, flattened tube heat exchanger unit as recited in claim 19 wherein the integral folded flat manifold assembly is formed from a single sheet clad with a brazing alloy.