Emerson Liebert Prop Fan Condensing Unit Manual de instalación descargar pdf (Pagina 16)

Site Preparation and Installation

2.4 Installing the Ceiling Units

The evaporator unit and indoor condensing unit are 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 5).

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.

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

2.4.1 Close Coupled Installations

If the evaporator and condensing units are to be mounted side-to-side (close coupled), hang each unit

before connecting them together (see Figure 7). Align bolt holes in the condensing unit and in the

evaporator. Insert rubber spacers and secure four (4) sets of hardware provided. Align the refrigerant

connections and tighten them as described in 2.4.3 - Piping Connections and Coolant Require-

ments.

2.4.2 Evaporator Air Distribution

Filter Box

The optional filter box mounts directly to the return air opening of the evaporator. The filter box is

supplied with two (2) 20% (Liebert part # 1A19647P1) or 30% (Liebert part # 128161P3) 20 in. x 20 in.

x 4 in filters.

Connections for Ducted Systems

Use flexible duct work or non-flammable cloth collars to attach duct work to the unit and to help con-

trol the transmission of vibrations to building structures. Insulation of duct work is vital to prevent

condensation during the cooling cycle. The use of a vapor barrier is required to prevent absorption of

moisture from the surrounding air into the insulation.

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 2.2 - System Weights.)

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

NOTE

The units must be level in order to drain condensate properly.

NOTE

Do not operate the unit without filters installed in return air system.

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Emerson Liebert Prop Fan Condensing Unit Manual de instalación Pagina 16