• If the unit is installed on a hot sun-exposed roof or a paved ground area that is seasonally hot,
the unit must be raised sufficiently above the roof or ground to avoid taking the accumulated
layer of hot air into the outdoor unit.
• If the system is being installed during seasonally cold weather of 55°F or below, the preferred
method is to weigh in the charge. For charging or checking the system charge at 55°F or below,
see . An optional cold weather charging accessory kit is available to prevent the outdoor unit
from taking in cold air below 55°F. The kit part number can be found in the list of accessory kits
at http://www.simplygettingthejobdone.com.
Select a location for the outdoor unit that meets any requirements that are specific to the type of
installation as outlined in Table 7.
Table 7: Additional location requirements for each type of installation
Type of installation Additional location requirements
Ground installation • The location of the outdoor unit allows
installation at ground level on a solid base
that does not shift or settle, causing strain
on the refrigerant lines and possible leaks.
• The location of the outdoor unit allows for
the condensate to drain directly on the
ground in a safe area where public walkways
will not be impacted.
Roof installation • The structure is capable of supporting the
total weight of the unit, including a base,
lintels, and rails. You must use a base, lintels,
and rails to minimize the transmission of
sound or vibration to the structure.
• The location of the outdoor unit allows
sufficient space for the base. The base must
not come in contact with the foundation or
side of the structure because sound may
transmit to the residence.
Wall-mounted installation • Mounting the outdoor unit does not cause a
loss of structural integrity.
• The location of the outdoor unit ensures that
there is minimal transmission of sound and
vibration into the living space.
• The outdoor unit can be accessed safely
when mounted, for example, for servicing.
• The location of the outdoor unit allows you
provide adequate support for the base pan.
Inspecting the unit
1. Remove the shipping carton and inspect the unit immediately after receiving it for possible
damage during transit.
2. If damage is evident, do the following:
a. Note the extent of any damage on the carrier's receipt.
b. Make a separate written request for the carrier's agent to inspect the unit.
c. Contact the local distributor for more information.
17Installation Manual: R-454B Outdoor Split-System Air Conditioner
Johnson Controls Ducted Systems
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