Abstract:
A conditioning unit can allow the blower to be easily translated from a first operable position in the conditioning unit to a second operable position external to the conditioning unit. The translation of the blower does not require the disconnection of the blower and, accordingly, does not require that the blower be disconnected and reconnected to the control system. Such capability can facilitate the installation of the conditioning unit into a variety of applications and allows the purchaser to customize the blower location based on the desired performance. The ability to customize the installation of the conditioning unit without requiring disconnection and reconnection of the blower can reduce the cost and expense associated with the installation into differing applications.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Application No. 60/989,741, filed on Nov. 21, 2007. The disclosure of the above application is incorporated herein by reference. 
    
    
     FIELD 
     The present invention relates to computer room environmental conditioning units and, more particularly, to conditioning units wherein the blower is translatable between different positions. 
     BACKGROUND AND SUMMARY 
     The statements in this section merely provide background and summary information related to the present teachings and may not constitute prior art. 
     Computer rooms utilize environmental conditioning unit(s) to condition the environment within which the computer equipment is located. The conditioning unit includes a heat exchanger through which air within a computer room is drawn to condition the air. A blower is utilized to draw air through the conditioning unit and across the heat exchanger. The conditioning unit is typically included in a cabinet than can be positioned in the computer room. The blower can be located in the cabinet or, alternatively, can be located external to the cabinet. For example, the blower can be located in a lower part of the conditioning unit and direct air flow through the cabinet and discharge into the space beneath the raised floor. Alternatively, the blower can be disposed below the raised floor and draw air through the cabinet and discharge into the raised floor. These types of arrangements are called down-flow arrangements (i.e., the blower discharges air into the space below the raised floor). In another type of arrangement, the blower can be located in the top portion of the conditioning unit and draws air from the computer room into the lower part of the conditioning unit which then flows through the conditioning unit and discharges through the top of the conditioning unit. These types of arrangements are called up-flow arrangements (i.e., the blower discharges air out the top of the conditioning unit). 
     In most applications, it is desirable to retain the blower unit within the conditioning unit. In other applications, it may be desirable to position the blower external to the unit, such as below the raised floor or above the conditioning unit. The conditioning unit, however, typically ships with the blower installed in the conditioning unit. To move the blower to another position may require the blower to be disconnected, relocated, and then electrically re-connected to the control system. The electrical connections and the control connections of the blower unit may be required to be certified to particular codes or standards. Therefore, the relocating of the blower may require that the blower and the conditioning unit be recertified before being put into use. Such tasks can be labor intensive and can increase the cost of changing the location of the blower. 
     A conditioning unit according to the present teachings can advantageously allow the blower to be easily translated from a first operable position in the conditioning unit to a second operable position external to the conditioning unit. The translation of the blower does not require the disconnection of the blower and, accordingly, does not require that the blower be disconnected and reconnected to the control system. Such capability can facilitate the installation of the conditioning unit into a variety of applications and allows the purchaser to customize the blower location based on the desired performance. The ability to customize the installation of the conditioning unit without requiring complex or arduous tasks or disconnection and reconnection of the blower can reduce the cost and expense associated with the installation of the conditioning unit into differing applications. Moreover, the ability to easily move the blower between multiple positions without requiring disconnection and reconnection can reduce the types of conditioning units that a manufacturer is required to offer to supply conditioning units for various applications. 
     A computer room environmental conditioning unit according to the present teachings can include a structural assembly and at least one blower operable to draw a flow of air through the conditioning unit. The at least one blower is coupled to the structural assembly and can be moved between first and second positions relative to the structural assembly. The at least one blower is coupled to the structural assembly in both the first and second positions. 
     A method according to the present teachings can include coupling at least one blower to a structural assembly of a computer room environmental conditioning unit, the at least one blower being coupled to the structural assembly in a first position and operable to be moved to a second position different than the first position and being coupled to the structural assembly in both of the first and second positions. The method can include connecting the at least one blower to a control system of the conditioning unit and shipping the conditioning unit to an installation site with the at least one blower in the first position and connected to the control system. The at least one blower is positioned in one of the first and second positions at the installation site. The conditioning unit is installed in a computer room at the installation site and the at least one blower is operated. 
     Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present teachings. 
    
    
     
       DRAWINGS 
       The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present teachings in any way. 
         FIG. 1  is a fragmented plan view of a first embodiment of a computer room environmental conditioning unit with translatable blowers according to the present teachings with all three blowers in a first operating position in the lower part of the conditioning unit; 
         FIG. 2  is a fragmented perspective view of the conditioning unit of  FIG. 1  with one of the blowers lowered into a second operating position below the conditioning unit; 
         FIG. 3  is a fragmented side plan view of the conditioning unit of  FIG. 2  showing the lowering of one of the blowers into the second operating position; 
         FIG. 4  is another fragmented perspective view of a portion of the conditioning unit of  FIG. 2  showing one of the blowers in the second operating position; 
         FIG. 5  is another fragmented perspective view of the conditioning unit of  FIG. 2  showing one of the blowers in the second operating position; 
         FIG. 6  is a perspective view of a scissor jack used to move the blower between the first and second operating positions; 
         FIG. 7  is a fragmented perspective view of a portion of a second embodiment of a computer room environmental conditioning unit with translatable blowers according to the present teachings wherein a jig assembly is utilized to move the blower between the first and second operating positions and the blower is in the second operating position; 
         FIG. 8  is a perspective view of the conditioning unit of  FIG. 7  with the blower in the first operating position and the jig assembly attached thereto; 
         FIG. 9  is a perspective view of the jig assembly used to move the blower between the first and second positions shown in  FIGS. 7 and 8 ; 
         FIG. 10  is a fragmented perspective view of a third embodiment of a computer room environmental conditioning unit according to the present teachings wherein the blowers can pivot between a first shipped position and a second operating position; 
         FIGS. 11 and 12  are fragmented perspective views of the conditioning unit of  FIG. 10  showing the mechanism utilized to move the blowers between the first and second positions; 
         FIG. 13  is a fragmented side plan view of the conditioning unit of  FIG. 10 ; 
         FIG. 14  is an enlarged fragmented perspective view of the hinge that couples the blowers to the conditioning unit in  FIGS. 10-13 ; 
         FIG. 15  is an enlarged fragmented perspective view of an alternate hinge configuration that can couple the blowers to the condition unit according to the present teachings wherein a torsion spring is utilized to assist with the movement of the blower between the first and second positions; 
         FIG. 16  is a fragmented perspective view of a fourth embodiment of a computer room environmental conditioning unit according to the present teachings wherein the blowers are pivoted between a first shipped position and a second operating position through the use of a threaded member; 
         FIG. 17  is a fragmented side plan view of the conditioning unit of  FIG. 16 ; 
         FIG. 18  is a fragmented perspective view of a fifth embodiment of a computer room environmental conditioning unit according to the present teachings wherein the blower is pivotable between a first shipped position and a second operating position through the use of a lever; 
         FIG. 19  is a perspective view of an up-flow computer room environmental conditioning unit according to the present teachings with the blower located in an upper part of the conditioning unit; 
         FIG. 20  is a perspective view of the conditioning unit of  FIG. 19  with the blower moved to a position on top of the conditioning unit and a plenum (without a grill) attached thereto according to the present teachings; and 
         FIG. 21  is a flow chart illustrating the testing and installation procedures for a computer room environmental conditioning unit according to the present teachings. 
     
    
    
     DETAILED DESCRIPTION 
     The following description is merely exemplary in nature and is not intended to limit the present teachings, applications, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features (e.g.,  20 ,  120 ,  220 , etc.). 
     Referring to  FIGS. 1-6 , a first embodiment of a computer room environmental conditioning unit  20  with translatable blowers according to the present teachings is shown. Conditioning unit  20  is illustrated in a simplified form without all of the details shown. Conditioning unit  20  includes a plurality of panels  21  that surround and enclose conditioning unit  20  and form a cabinet. Conditioning unit  20  includes a variety of components that are operable to condition an air flow flowing therethrough. Conditioning unit  20  includes a heat exchanger  22  which is operable to transfer heat between a fluid flowing through heat exchanger  22  and an air flow flowing across heat exchanger  22 . Heat exchanger  22  can take a variety of forms. As a non-limiting example, one type of heat exchanger includes a fin on tube heat exchanger wherein the heat transfer fluid flows through the tubes and the air flow flows across the fins. Conditioning unit  20  includes a plurality of blowers  24  that are operable to direct the air flow across heat exchanger  22 . Conditioning unit  20  includes a control system  26  which it is connected to blowers  24 . Control system  26  can be operable to supply electrical power to motors  28  of blowers  24  and can command blowers  24  to turn on and off and can vary the blower speed. Control system  26  can also control other components of conditioning unit  20 , such as valves or other mechanisms controlling the flow of the heat transfer fluid through heat exchanger  22 . Blowers  24 , by way of non-limiting example, can include a fan member  25  driven by motor  28  and surrounded by a screen or cage  27 . 
     Conditioning unit  20  shown in  FIGS. 1-6  is a down-flow type conditioning unit. Blowers  24  draw air from above conditioning unit  20  into the conditioning unit, through filters (not shown), across heat exchanger  22 , and discharge the air out of the bottom  32  of conditioning unit  20  and into the space below the raised floor  34  of the computer room. 
     Conditioning unit  20  allows blowers  24  to be moved between a first operable position, such as that shown in  FIG. 1 , to a second operable position, such as shown in  FIG. 2 , wherein the leftmost blower has been lowered to the second operable position. When in the second position, blower  24  is primarily located in the space below raised floor  34 . In both positions, blowers  24  draw air into conditioning unit  20  from above and discharge the air into the space beneath raised floor  34 . When shipped from the factory, blowers  24  are all in the raised first position, as shown in  FIG. 1 . 
     To allow for the movement of blowers  24  between the first and second operative positions, conditioning unit  20  includes a structural assembly  36  that enables blowers  24  to be secured and operated in both the first and second positions. Structural assembly  36  includes an upper level  38  and a lower level  40 . Upper level  38  includes a pair of longitudinally extending support members  42  and a plurality of laterally extending support members  44  that extend laterally between support members  42 . Similarly, lower level  40  also includes a pair of longitudinally extending support members  46  and a plurality of laterally extending support members  48  that extend laterally between support members  46 . Lower level  40  also defines bottom  32  of conditioning unit  20 . Support members  42 ,  44  and  46 ,  48  form a plurality of rectangular openings within which blowers  24  are disposed. 
     Blowers  24  include an upper outwardly extending flange  50  that is coupled to the upper and lower levels  38 ,  40  when in the respective first and second operative positions. Specifically, when blowers  24  are secured in the first position, flange  50  is secured to the bottom surface of support members  42 ,  44  of upper level  38 . Blowers  24  can be secured thereto with the use of threaded fasteners which can be inserted into openings  52  in flange  50  from below or above and secured to support members  42 ,  44 . Support members  42 ,  44  can have threaded openings that are complementary to the fasteners, thereby enabling blowers  24  to be secured to upper level  38  with fasteners inserted from beneath or above flange  50 . In the second operative position, flange  50  rests on the top surface of support members  46 ,  48  of lower level  40 . Support members  46 ,  48  can have a plurality of threaded openings that align with openings  52 , thereby enabling blowers  24  to be secured to the lower level  40  with threaded fasteners. When secured to lower level  40 , fasteners are inserted through the top side of flange  50 . 
     Various mechanisms can be used to move blowers  24  from the first operable shipped position, as shown in  FIG. 1 , to the second operable position, as shown in  FIG. 2 . Conditioning unit  20  is disposed on a support frame  56  which supports conditioning unit  20  such that bottom  32  is substantially flush with raised floor  34 . Support frame  56  includes a plurality of laterally extending rails  58 . One rail  58  is associated with each blower  24 . Rails  58  are configured to retain a jack mechanism  60 , such as a scissor jack, thereto. Scissor jack  60  is used to move blowers  24  between the first and second positions. As best seen in  FIG. 6 , rail  58  includes an extension  62  which can receive a portion of the base  64  of scissor jack  60 . Extension  62  aligns scissor jack  60  beneath an associated blower  24  while also inhibiting movement of scissor jack  60  relative to rail  58  during the movement of an associated blower  24  between the first and second positions. 
     As stated above, conditioning unit  20  is shipped from the factory with blowers  24  in the first operative position, as shown in  FIG. 1 . To move blowers  24  from the first position to the second position, scissor jack  60  is disposed beneath the blower  24  that is to be moved with base  64  engaging with extension  62 . Threaded rod  66  of scissor jack  60  is rotated to cause top plate  68  of scissor jack  60  to move upwardly and support motor  28  of the associated blower  24 . With scissor jack  60  in place supporting blower  24 , the fasteners securing blower  24  to upper level  38  can be removed. Threaded rod  66  is now rotated in the opposite direction to lower top plate  68  and blower  24  from the first position to the second position. A pair of guide members  70 , in this case in the form of guide rods, extends between upper and lower levels  38 ,  40  through flange  50  of blower  24 . Guide rods  70  guide the motion of blower  24  between the first and second positions. Guide rods  70  help maintain the alignment of blowers  24  with upper and lower levels  38 ,  40 . It should be appreciated that the guide members can take forms other than the guide rods  70  shown and that guide rods  70  are merely a non-limiting example of suitable guide members  70 . Threaded rod  66  is rotated until flange  50  of blower  24  rests on lower level  40 . The fasteners can then be used to secure flange  50  to support members  46 ,  48  of lower level  40 , thereby securing blower  24  in the second position. The opposite steps can be performed to move blower  24  from the second position to the first position. 
     During the movement of blower  24  between the first and second positions, blower  24  remains connected to control system  26 . Thus, when blowers  24  are secured in a lowered second position, blowers  24  are ready to be operated along with conditioning unit  20 . 
     To remove scissor jack  60 , threaded rod  66  can continue to be rotated to lower top plate  68  away from motor  28  of the associated blower  24 . Once scissor jack  60  has been reduced to the appropriate height, scissor jack  60  can be disengaged from extension  62  and moved to a different rail  58  to move the blower  24  thereabove between the first and second positions. Scissor jack  60  can remain on one of the rails  58  during operation such that in a future maintenance need the scissor jack  60  is in place and readily available for use. 
     Conditioning unit  20  is assembled at the factory with blowers  24  secured to upper level  38 . At the factory, blowers  24  are connected to control system  26  and the operation of blowers  24  is tested. The testing can include determining whether blowers  24  are functioning, checking the level of vibration due to blower operation, checking for proper electrical connection, checking for proper electrical grounding, and checking for proper voltage for the motor  28  by way of non-limiting example. The testing also includes certifying conditioning unit  20  as meeting the applicable rating standards. For example, one type of rating standard is a CSA/UL 236/1995 rating. Thus, blowers  24  of conditioning unit  20 , when shipped, are in a certified operating condition and can be placed in the computer room, electrical power connected to conditioning unit  20 , and operation can commence. 
     Thus, a user or purchaser of conditioning unit  20  can position conditioning unit  20  on an appropriate support frame, such as support frame  56 , and can connect conditioning unit  20  to the appropriate external connections. Conditioning unit  20  can then be used as is with blowers  24  in their first position and secured to upper level  38 . Some customers or purchasers, however, may desire that blowers  24  be positioned in the space beneath raised floor  34 , which may increase the efficiency of blowers  24  and may reduce the power usage. In this instance, the purchaser or customer can utilize scissor jack  60  to move blowers  24  from the first operative position to the second operative position as discussed above. Because control system  26  remains connected to blowers  24  during the movement between the first and second operative positions, blowers  24  do not need to be electrically disconnected and then reconnected from conditioning unit  20  during their movement between the first and second operative positions. 
     Referring now to  FIGS. 7-9 , a second embodiment of a computer room environmental conditioning unit  120  having blowers  124  that can be moved between first and second operative positions according to the present teachings is shown. Conditioning unit  120  is similar to conditioning unit  20  discussed above. As such, not all of the details of conditioning unit  120  will be described. 
     In conditioning unit  120 , blowers  124  are moved between the first and second operative positions with a jig assembly  172 . Jig assembly  172  includes an upper support member  174  and a lower support member  176  that can be moved relative to one another with a threaded rod  178 . Each support member  174 ,  176  includes a centrally located opening  180  that aligns with one another and is configured to receive threaded rod  178 . Threaded rod  178  can be inserted through and engaged with central openings  180  of support members  174 ,  176  with the head  179  of threaded rod  178  and a washer  173  adjacent the lower surface of lower support member  176 . The opposite end of threaded rod  178  extends beyond the upper surface of upper support member  174 . A washer  175  and nut  182  can be secured to threaded rod  178  such that washer  175  and nut  182  are on the upper surface of support member  174 . Head  179  and washer  173  and nut  182  and washer  175  thereby prevent threaded rod  178  from being removed from support members  174 ,  176 . 
     Lower support member  176  includes a pair of flanges  184  on the opposite ends thereof. Flange  184  includes a plurality of openings that align with openings in flange  150  of blower  124 . In this manner, lower support member  176  can be removeably secured to blower  124  with threaded fasteners. Similarly, upper support member  174  also includes a pair of flanges  186  on the opposite ends thereof. Flange  186  includes a plurality of openings that align with threaded openings in upper level  138  of structural assembly  136 . Thus, jig assembly  172  can be secured to a blower  124  and upper level  138  of structural assembly  136 . 
     To move blower  124  between the first (raised) operative position, as shown in  FIG. 8 , to the second (lowered) operative position, as shown in  FIG. 7 , jig assembly  172  is secured to the desired blower  124  to be moved and to the upper level  138  of structural assembly  136  above the blower  124  that is to be moved. When jig assembly  172  is secured to the blower  124 , nut  182  can be rotated to place threaded rod  178  in tension, thereby indicating that support members  174 ,  176  and threaded rod  178  will support blower  124  when the fasteners securing flange  150  of blower  124  to the bottom surface of upper level  138  are removed. With jig assembly  172  in this position, the fasteners securing blower  124  to upper level  138  can be removed. Blower  124  is thereby supported by jig assembly  172 . Nut  182  can be rotated relative to threaded rod  178  to move along threaded rod  178  and allow lower support member  176  to move away from upper support member  174 . Nut  182  is rotated relative to threaded rod  178  until flange  150  rests on the upper surface of lower level  140  of structural assembly  136 . Once in this position, the fasteners can again be utilized to secure flange  150  of blower  124  to support members  146 ,  148  of lower level  140 . With blower  124  secured to lower level  140 , jig assembly  172  can be removed from blower  124  and upper level  138 . Blower  124  is now in the second operative position and is ready to be used. 
     Jig assembly  172  can then be used to move the other blowers  124  of conditioning unit  120  between the first and second operative positions, as desired. Jig assembly  172  is not maintained attached to conditioning unit  120  during operation. If desired, jig assembly  172  can be stored in the space beneath raised floor  134 . Optionally, guide rods similar to those described above can be used to help guide movement of blowers  124  between the first and second positions. 
     Again, during the movement of blower  124  between the first and second operative positions, blower  124  remains connected to control system  126  and does not require disconnecting and reconnecting blower  124  from/to control system  126  to move between the first and second operative positions. To move blower  124  back to the first operative position, the opposite steps are performed with jig assembly  172 . 
     Thus, in conditioning unit  120 , a jig assembly  172  can be attached to a blower  124  and used to move the blower  124  between the first and second operative positions. Such capability allows a purchaser to utilize conditioning unit  120  with blowers  124  in the first operative position or in the second operative position, similar to that discussed above with reference to conditioning unit  20 . Additionally, conditioning unit  120  can be certified at the factory and shipped to the user/purchaser as a certified conditioning unit. 
     Referring now to  FIGS. 10-14 , a third embodiment of a conditioning unit  220  that allows a blower  224  to be moved between first and second positions according to the present teachings is shown. Conditioning unit  220  is similar to conditioning unit  20  discussed above. Thus, all the details of conditioning unit  220  will not be described. In conditioning unit  220 , however, blowers  224  are intended to be used only in the second lowered position. In conditioning unit  220 , blowers  224  pivot between the first shipped position and the second lowered and operable position. In  FIGS. 10-12 , the rightmost blower  224  is shown in the first shipped position, while the middle and left blowers  224  are shown in the second operative position wherein blowers  224  are disposed in the space beneath raised floor  234 . 
     Blowers  224  are pivotally secured to the rear longitudinal support member  246  of lower level  240  of structural assembly  236 . One end of flange  250  of each blower  224  has a bracket  290  that extends therefrom. The rear longitudinal support member  246  has a complementary bracket  292  thereon that aligns with bracket  290 . A pivot rod  294  interconnects brackets  290 ,  294  such that brackets  290 ,  294  can pivot relative to one another about pivot rod  294 . This engagement enables blowers  224  to be pivoted about pivot rod  294  between the first and second positions. 
     To facilitate the movement of blowers  224  between the first and second positions, a pair of assist mechanisms  296  can be coupled to each blower  224  and to structural assembly  236 . Assist mechanisms  296  can be used to dampen the motion of blower  224  between the first and second positions and reduce the effort required to pivot blowers  224  between the first and second positions. Assist mechanism  296  can take a variety of forms. For example, in  FIGS. 10-14 , assist mechanism  296  is a gas strut. When assist mechanism  296  is a gas strut, a pair of assist mechanisms  296  can be associated with each blower  224  and can be connected to blower  224  and to lateral support members  248  of lower level  240  of structural assembly  236 . Specifically, support members  248  can include one or more upwardly extending brackets  297  and blowers  224  can include a pair of brackets  298  that extends upwardly from the top surface of flange  250 . One end of assist mechanism  296  is attached to bracket  297 , while the opposite end of assist mechanism  296  is attached to bracket  298 . During the pivoting of blower  224  between the first and second positions, assist mechanisms  296  will elongate/retract. The elongation and retraction of assist mechanisms  296  is dampened such that the effort to move blower  224  between the first and second positions is reduced. Additionally, assist mechanisms  296  can reduce the velocity at which blower  224  can move between the first and second positions. In this manner, assist mechanisms  296  can facilitate the movement of blowers  224  between the first and second positions. 
     Blowers  224  are installed in the conditioning unit  220  at the factory in the first raised position. In this position, blower  224  cannot be operated to draw an air flow through conditioning unit  220 . Blowers  224  can, however, be tested when in this position. Thus, when manufacturing conditioning unit  220 , blower  224  is installed in the first raised position and is connected to control system  226 . Blowers  224  are secured in this position through the use of one or more fasteners that can engage with structural assembly  236  to prevent blowers  224  from moving from the first position. At the factory, operation of blowers  224  is checked prior to shipment. Specifically, as stated above with reference to conditioning unit  20 , blowers  224  are connected to control system  226  and their operation is ascertained. Additionally, conditioning units  220  can be certified at the factory. Thus, conditioning unit  220  can be shipped to a purchaser/user as a certified unit with blowers  224  already connected to control system  226  of conditioning unit  220 . 
     When conditioning unit  220  arrives in the computer room, conditioning unit  220  can be attached to a support frame  256 . The fasteners retaining blowers  224  in the first position can then be removed and blower  224  pivoted about pivot rod  294  from the first position to the second operative lowered position. When in the second position, flange  250  resides on the upper surface of lower level  240  of structural assembly  236 . Fasteners can then be utilized to secure flange  250  to lower level  240 , as described above with reference to conditioning unit  20 . During the movement of blowers  224  between the first and second positions, the connection of blowers  224  to control system  226  remains. As such, blowers  224  do not need to be disconnected and then reconnected with control system  226  to move between the first and second positions. Therefore, the installation and use of conditioning unit  220  is facilitated. If desired, blowers  224  can include a handle or other type of protrusion that can be easily gripped by the installer to facilitate the movement of blowers  224  between the first and second positions. 
     As stated above, the assist mechanism utilized in conditioning unit  220  can take a variety of forms. For example, as shown in  FIG. 15 , another assist mechanism  296 ′ can be in the form of a torsion spring  296 ′ which is wrapped around pivot rod  294 ′. Assist mechanism  296 ′ can be disposed on pivot rod  294 ′ with one end engaged with bracket  290 ′ and the other end engaged with bracket  292 ′. Assist mechanism  296 ′ is configured to resist movement of blower  224 ′ from the first position to the second position. In this manner, assist mechanism  296 ′ can facilitate the movement of blower  224 ′ between the first and second positions. 
     Referring now to  FIGS. 16-17 , a fourth embodiment of a computer room environmental conditioning unit  320  according to the present teachings is shown. Conditioning unit  320  is similar to conditioning unit  220  in that blowers  324  pivot between a first shipped (raised) position and a second (lowered) operating position. As such, all the details of conditioning unit  320  are not described herein. 
     In conditioning unit  320 , lower level  340  of structural assembly  336  includes a plurality of hinge brackets  381  that engage with complementary hinge brackets  383  on flange  350  of blower  324 . The engagement of hinge brackets  381 ,  383  allows blower  324  to rotate about pivot  385  between the first and second positions. 
     In conditioning unit  320 , assist mechanism  396  includes a jacking screw  387  that is threadably engaged with a threaded pivot  389  on flange  350  of blower  324 . An end of jacking screw  387  can extend into and/or through panel  321  such that jacking screw  387  is accessible from the exterior side of panel  321  of conditioning unit  320 . Rotation of jacking screw  387  causes threaded pivot  389  to move along the length of jacking screw  387  and the associated blower  324  to move between the first and second positions, depending upon the direction of rotation of jacking screw  387 . 
     Conditioning unit  320  is assembled at the factory with blowers  324  in the first shipped position. Shipping brackets  391  can be connected to the lower portion of blowers  324  and to lateral support members  348  of lower level  340  of structural assembly  336 . Shipping brackets  391  maintain blowers  324  in the first position during shipment of conditioning unit  320 . Additionally, blowers  324  are coupled to control system  326  and tested when in the first position at the factory. As such, conditioning unit  320  can be certified at the factory and shipped to the user/purchaser as a certified conditioning unit. 
     The conditioning unit  320  is installed in the computer room with bottom  332  generally aligned with raised floor  334 . When conditioning unit  320  is being installed, shipping brackets  391  are removed therefrom and jacking screw  387  rotated to pivot blowers  324  from the first position to the second lowered and operative position. Fasteners can secure blowers  324  to lower level  340  when in the second position. When in the operative position, blowers  324  are in the space beneath raised floor  334 . Blowers  324  do not need to be disconnected from control system  326  when being moved between the first and second positions. As such, movement of conditioning unit  320  is facilitated. The opposite steps can be performed to move blowers  324  from the second position to the first position. 
     Referring now to  FIG. 18 , a fifth embodiment of a computer room environmental conditioning unit  420  according to the present teachings is shown. Conditioning unit  420  is similar to conditioning unit  320  described above. As such, not all details of conditioning unit  420  are described herein. 
     In conditioning unit  420 , assist mechanism  496  is in the form of a lever that can be selectively secured to the top surface of flange  450  adjacent hinge bracket  483 . Again, blowers  424  rotate about pivot  485  formed by the interaction of hinge brackets  481 ,  483 . When conditioning unit  420  is assembled at the factory, blowers  424  are secured in the first raised position with shipping brackets (not shown). Additionally, blowers  424  are connected to control system  426  and the operation of blowers  424  is tested. As such, conditioning unit  420  can be shipped to a purchaser/user as a certified conditioning unit. 
     When installed in the computer room, one or more panels  421  are removed therefrom and assist mechanism/lever  496  is attached to flange  450  of a blower  424 . The shipping brackets are then removed and the blower  424  is rotated about pivot  485  from the first position to the second position through the use of lever  496 . When in the second position, flange  450  rests on lower level  340  of structural assembly  436 . Blower  424  is then secured thereto with the appropriate fasteners, as described above. Lever  496  is removed from blower  424  and can be reused to move another blower between the first and second positions. During movement of blower  424  from the first position to the second position, blower  424  is not disconnected from control system  426 . As such, movement of conditioning unit  420  is facilitated. To return blower  424  to the first position, the opposite steps can be performed. 
     Referring now to  FIGS. 19 and 20 , an up-flow computer room environmental conditioning unit  520  according to the present teachings is shown. Conditioning unit  520  is similar to the other conditioning units described herein. As such, all of the details of conditioning unit  520  will not be described herein. In conditioning unit  520 , blowers  524  are installed in the upper portion of conditioning unit  520  and supported by support member assembly  554 . In this configuration, blowers  524  are operable to pull air from the computer room into the lower part of conditioning unit  520 , through heat exchanger  522 , and exhaust the air through the top  529  of conditioning unit  520 . Top  529  of conditioning unit  520  can be connected to appropriate duct work, such as a plenum  531  or other duct work, in the computer room to direct the flow of conditioned air to the desired locations. 
     Conditioning unit  520  is assembled at the factory with blowers  524  in the upper part of conditioning unit  520  and supported by support member assembly  554 . At the factory, blowers  524  are connected to the control system  526  and operation of blowers  524  is tested. The testing also includes certifying the conditioning unit  520  as meeting the applicable rating standards. Thus, the conditioning unit  520 , when shipped, is in an operating condition and can be placed in the computer room, electrical power connected to conditioning unit  520 , and operation can commence. Accordingly, conditioning unit  520  can be shipped to a purchaser/user as a certified conditioning unit. 
     In some applications, the customer or purchaser of conditioning unit  520  may wish to move blowers  524  to a position above top  529  of conditioning unit  520 . In these applications, discharge plenum  531  or other suitable duct work can be attached to top  529  of conditioning unit  520  to provide a desired cavity and discharge for blowers  524 . Blowers  524  can be translated from the position in the upper part of conditioning unit  520 , as shown in  FIG. 19 , to a position above top  529  of conditioning unit  520  and supported by top  529  of conditioning unit  520 , as shown in  FIG. 20 . This can be accomplished without disconnecting blowers  524  from control system  526 . Furthermore, because control system  526  is not disconnected from blowers  524 , movement of blowers  524  is facilitated. Conditioning unit  520  can include discharge grills (not shown for clarity). 
     Blowers  524  are operable in both the first shipped position, as shown in  FIG. 19 , and in the second position shown in  FIG. 20 . Blowers  524  can be moved between the first and second positions in a variety of manners. For example, the mechanisms and arrangements discussed above with reference to conditioning units  20 ,  120 ,  220 ,  320 , and  420  can be utilized to move blowers  524  between the first and second positions. In some of these applications, blowers  524  may be in a first non-operative and shipped position, as discussed above with reference to blowers that pivot between the first and second positions. Regardless of the mechanisms and arrangements utilized, the up-flowing conditioning unit  520  according to the present teachings can include blowers that are certified at the factory and can be moved between first and second positions when being installed. 
     Referring now to  FIG. 21 , a flow chart illustrating portions of the assembly, shipping, and installation of conditioning units according to the present teachings is shown. The conditioning units according to the present teachings are assembled at the factory by attaching the blower to the structural assembly with the blower in a first position, as indicated in block  600 . As stated above, the attachment of the blower to the structural assembly can be accomplished with a variety of mechanizations and configurations. The attachment, however, regardless of configuration or mechanization can allow the blower to be translated between first and second positions, as discussed above with reference to the various embodiments. With the blower attached to the structural assembly, the blower is then connected to the control system, as indicated in block  602 . 
     Operation of the blower is then tested, as indicated in block  604 . As stated above, the testing of the operation of the blowers can include testing for the vibration level, the proper voltage, and the proper electrical connection, by way of non-limiting example. Additionally, the blowers can be certified for operation, as indicated in block  606 . With the blower fully tested and certified, a certified conditioning unit can be shipped to a purchaser with the blower in the first position, as indicated in block  608 . 
     The purchaser can then install the conditioning unit in the computer room. When installing the conditioning unit in the computer room, the blower can be moved from the first position to the second position, as desired, as indicated in block  610 . As stated above, in some of the embodiments, the blower if operable in both the first and second positions while in other embodiments the first position is merely a shipping position and the blower must be moved the second position to be operational. Thus, in some applications the conditioning unit will be operated with the blowers in the first position, while in other applications the conditioning unit will be operated with the blowers in the second position. Because the movement of the blowers between the first and second positions does not require that the blowers be disconnected from the control system, movement of the blowers is facilitated. 
     With the blowers in the desired operational position, the electrical connections can be made to the conditioning unit, as indicated in block  612 . Along with making the electrical connections, any other additional connections required to install the conditioning unit in the computer room can also be performed. With the conditioning unit electrically connected, operation of conditioning unit can commence, as indicated in block  614 . 
     It should be appreciated that the preceding description of the assembly, testing, shipping, and installation of the conditioning unit does not include every step or detail associated therewith. Rather, the preceding description and illustration shown in  FIG. 21  is merely representative of steps that are to be performed and are not all inclusive. 
     Thus, a computer room environmental conditioning unit according to the present teachings has one or more blowers that are translatable between first and second positions. In some embodiments, the blowers can move between first and second positions that are both operable. In other embodiments, the first position is a non-operable position, while the second position is an operable position. In all of the embodiments, the conditioning units and the blowers therein may be capable of having their operation checked and be certified when in the first position and can be shipped as a certified conditioning unit. When the blowers are subsequently moved between the first and second positions during installation in the computer room, the blowers remain connected to the control system and such movement is facilitated. Additionally, the various conditioning units disclosed herein provide a variety of mechanisms and arrangements to further facilitate moving of the blowers between the first and second positions. The ability to change the location of the blower can allow customization of the computer room within which the conditioning units are to be utilized. Additionally, this capability can reduce the number of different conditioning units or configurations that a manufacturer needs to supply to meet the variety of applications. 
     While the conditioning units are described herein by reference to specific examples and embodiments, it should be appreciated that changes and alterations to the embodiments disclosed can be made. For example, the various components and features of the different embodiments can be mixed and matched, as desired, to achieve a desired functionality. Moreover, other mechanisms or arrangements that provide similar functionality can also be employed. Thus, the specific examples, illustrations, and embodiments disclosed herein are merely representative in nature and changes and alterations to the embodiments shown should be considered to be within the scope of the claims.