Split System Models

7.5Centrifugal Air-Cooled Condensing Units

7.5.1Installing the Indoor Condensing Unit

Refer to drawings for unit dimensions and component locations.

! WARNING

Risk of ceiling collapse and heavy unit falling. Can cause equipment and building damage, serious injury or death.

Verify that the supporting roof structure is capable of supporting the weight of the unit(s) and the accessories during installation and service. (See Table 30 - Indoor centrifugal condensing unit.)

Be sure to securely anchor the top ends of the suspension rods. Make sure all nuts are tight.

The indoor condensing unit is usually mounted above the ceiling and must be securely mounted to the roof structure. The ceiling and ceiling supports of existing buildings may require reinforcements. Be sure to follow all applicable national, state and local building, plumbing and electrical codes. Use field-supplied threaded suspension rods and 3/8"-16 factory hardware kit.

The indoor condensing unit must be located at the same level or above the Liebert Challenger 3000 unit. It must NOT be located below the Liebert Challenger 3000.

Recommended clearance between ceiling grids and building structural members is unit height plus 3 inches (76.2mm).

Install the four field-supplied rods by suspending them from suitable building structural members. Locate the rods so that they will align with the four mounting holes in the flanges that are part of the unit base.

Using a suitable lifting device, raise the unit up and pass the threaded rods through the four mounting holes in the flanges that are part of the unit base.

Attach the threaded rods to the unit flanges using the supplied nuts and grommets. (See Figure 35 - Detail of ceiling hanging bracket, Threaded Rod and Hardware Kit Installation). The rubber grommets provide vibration isolation.

1.Use the plain nuts to hold unit in place. Adjust these nuts so that the weight of the unit is supported evenly by the four rods, does not rest on the ceiling grid, and is level.

NOTE

The units must be level in order to operate properly.

2.Use the Nylock nuts to “jam” the plain nuts.

Table 30 Indoor centrifugal condensing unit

 

Model

Net Weight

 

 

 

60 Hz

 

50 Hz

lb (kg)

 

 

 

 

MC_40A

 

MC_39A

240 (109)

 

 

 

 

MC_65A

 

MC_64A

449 (204)

 

 

 

 

67

Liebert® Challenger 3000™

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Emerson 3000 Centrifugal Air-Cooled Condensing Units, Installing the Indoor Condensing Unit, MC65A MC64A
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3000 specifications

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