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

Be sure 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 codes. Use field-supplied threaded suspension rods and

3/8"-16 factory hardware kit.

Recommended clearance between ceiling grids and building structural members is unit height plus three inches.

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 mount- ing 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 25 - 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

lbs (kg)

 

 

 

MC_40A

MC_39A

240 (109)

 

 

 

MC_65A

MC_64A

449 (204)

 

 

 

MC_44W

MC_43W

190 (86)

 

 

 

MC_69W

MC_68W

282 (128)

 

 

 

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Liebert 3000 installation manual Centrifugal Air Cooled Condensing Units, Installing the Indoor Condensing Unit

3000 specifications

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