Installing the outdoor unit
There are three installation options for the outdoor unit: ground installation, roof installation, and
wall-mounted installation. You must follow all requirements for the specific type of installation. See
Selecting a location for installation for location requirements for ground, roof, and wall-mounted
installation.
If you are installing the outdoor unit as a replacement for an existing unit, follow the procedure
outlined in Installing the outdoor unit as a replacement unit.
Setting the outdoor unit on the ground or on a roof
Before you begin:
Make sure that the location you have selected for the outdoor unit is suitable. See Selecting a
location for installation.
About this task:
For ground installation, you must use a strong, solid base, made of concrete or a similar material.
For roof installation, you must use a base, lintels, and rails to minimize the transmission of sound
or vibration to the structure. If site conditions require, elevate the unit above the base, for example,
using riser legs, a stand, or snow legs.
1. Position the base in the pre-determined location, see Selecting a location for installation.
2. Ensure that the compressor tie-down bolts remain tightened.
3. Install the unit in as level a position as possible while maintaining the clearances shown in
Figure 5 and Figure 6.
4. Fasten the outdoor unit tightly to prevent noise.
Figure 5: Typical installation clearances
19Installation Manual: R-454B Outdoor Split-System Air Conditioner
Johnson Controls Ducted Systems
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