Air handler

Abstract

The present disclosure provides a system including a V-shaped round tube plate fin evaporator coil disposed within a cabinet, a first coil extension coupled to a first tube sheet at a first arm of the evaporator coil, a second coil extension coupled to a second tube sheet at a second arm of the evaporator coil, and a door disposed on a front portion of the cabinet to provide access to the evaporator coil. Each of the first coil extension and the second coil extension extends along a transverse direction of the evaporator coil. An insulating material disposed on an inner surface of the door can be included, where the first coil extension, the second coil extension, and the insulating material together achieve a seal.

What is claimed is: 
     
         1 . A system comprising:
 a cabinet;   a V-shaped round tube plate fin evaporator coil;   a first coil extension coupled to a first tube sheet at a first arm of the V-shaped round tube plate fin evaporator coil, wherein the first coil extension extends along a transverse direction of the V-shaped round tube plate fin evaporator coil;   a second coil extension coupled to a second tube sheet at a second arm of the V-shaped round tube plate fin evaporator coil, wherein the second coil extension extends along the transverse direction of the V-shaped round tube plate fin evaporator coil;   a door disposed on the cabinet to provide access to the V-shaped round tube plate fin evaporator coil; and   an insulating material disposed on an inner surface of the door, wherein the first coil extension, the second coil extension, and the insulating material together achieve a seal.   
     
     
         2 . The system of  claim 1 , wherein the first coil extension is removably coupled to the first tube sheet and the second coil extension is removably coupled to the second tube sheet. 
     
     
         3 . The system of  claim 1 , wherein the door is detachably coupled to the cabinet via tooled fasteners. 
     
     
         4 . The system of  claim 1 , further comprising:
 a first sealing member attached to a first peripheral surface of the first coil extension, and   a second sealing member attached to a second peripheral surface of the second coil extension,   wherein the first sealing member and the second sealing member are configured to achieve the seal with the insulating material of the door.   
     
     
         5 . The system of  claim 4 , wherein each of the first sealing member and the second sealing member comprises a compressive material. 
     
     
         6 . The system of  claim 1 , wherein each of the first coil extension and the second coil extension comprises a flat longitudinal surface configured to direct condensate towards a drain pan of the V-shaped round tube plate fin evaporator coil. 
     
     
         7 . The system of  claim 1 , further comprising:
 a first insulation strip attached to a bottom surface of the first coil extension; and   a second insulation strip attached to a bottom surface of the second coil extension,   wherein each of the first insulation strip and the second insulation strip is configured to prevent dripping of condensate from corresponding bottom surfaces of the first coil extension and the second coil extension, respectively.   
     
     
         8 . The system of  claim 1 , wherein:
 the first tube sheet defines a first slit,   the second tube sheet defines a second slit,   the first coil extension comprises a first tab configured to engage with the first slit, and   the second coil extension comprises a second tab configured to engage with the second slit.   
     
     
         9 . The system of  claim 1 , wherein:
 the first tube sheet includes a first protrusion,   the second tube sheet includes a second protrusion,   the first coil extension defines a first locating hole configured to receive the first protrusion, and   the second coil extension defines a second locating hole configured to receive the second protrusion.   
     
     
         10 . The system of  claim 1 , wherein each of the first coil extension and the second coil extension comprises a root member configured to engage with a drain pan of the V-shaped round tube plate fin evaporator coil. 
     
     
         11 . A cased coil comprising:
 a housing;   a V-shaped round tube plate fin evaporator coil;   a first coil extension coupled to a first tube sheet at a first arm of the V-shaped round tube plate fin evaporator coil, wherein the first coil extension extends along a transverse direction of the V-shaped round tube plate fin evaporator coil;   a second coil extension coupled to a second tube sheet at a second arm of the V-shaped round tube plate fin evaporator coil, wherein the second coil extension extends along the transverse direction of the V-shaped round tube plate fin evaporator coil;   a door that provides access to the V-shaped round tube plate fin evaporator coil; and   an insulating material disposed on an inner surface of the door, wherein the first coil extension, the second coil extension, and the insulating material together achieve a seal.   
     
     
         12 . The cased coil of  claim 11 , wherein the first coil extension is removably coupled to the first tube sheet and the second coil extension is removably coupled to the second tube sheet. 
     
     
         13 . The cased coil of  claim 11 , wherein the door is detachably coupled to the housing via tooled fasteners. 
     
     
         14 . The cased coil of  claim 11 , further comprising:
 a first sealing member attached to a first peripheral surface of the first coil extension, and   a second sealing member attached to a second peripheral surface of the second coil extension,   wherein the first sealing member and the second sealing member are configured to achieve the seal with the insulating material of the door.   
     
     
         15 . The cased coil of  claim 14 , wherein each of the first sealing member and the second sealing member comprises a compressive material. 
     
     
         16 . The cased coil of  claim 11 , wherein each of the first coil extension and the second coil extension comprises a flat longitudinal surface configured to direct condensate towards a drain pan of the V-shaped round tube plate fin evaporator coil. 
     
     
         17 . The cased coil of  claim 11 , further comprising:
 a first insulation strip attached to a bottom surface of the first coil extension; and   a second insulation strip attached to a bottom surface of the second coil extension,   wherein each of the first insulation strip and the second insulation strip is configured to prevent dripping of condensate from corresponding bottom surfaces of the first coil extension and the second coil extension, respectively.   
     
     
         18 . The cased coil of  claim 11 , wherein:
 the first tube sheet defines a first slit,   the second tube sheet defines a second slit,   the first coil extension comprises a first tab configured to engage with the first slit, and   the second coil extension comprises a second tab configured to engage with the second slit.   
     
     
         19 . The cased coil of  claim 11 , wherein:
 the first tube sheet includes a first protrusion,   the second tube sheet includes a second protrusion,   the first coil extension defines a first locating hole configured to receive the first protrusion, and   the second coil extension defines a second locating hole configured to receive the second protrusion.   
     
     
         20 . The cased coil of  claim 11 , wherein each of the first coil extension and the second coil extension comprises a root member configured to engage with a drain pan of the V-shaped round tube plate fin evaporator coil.