JOHNSON CONTROLS
18
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 2 – INSTALLATION
5. The unit should be installed on a roof that is structur-
ally strong enough to support the weight of the unit
with a minimum of deflection. It is recommended
that the unit(s) be installed not more than 15 feet
from a main support beam to provide proper
structural support and to minimize the transmis-
sion of sound and vibration. Ideally, the center of
gravity should be located over a structural sup-
port or building column.
6. Location of unit(s) should also be away from
building flue stacks or exhaust ventilators to pre
-
vent possible reintroduction of contaminated air
through the outside air intakes.
7. Be sure the supporting structures will not obstruct
the duct, gas or wiring connections.
Location
Of the many factors that can affect the location of
equipment, some of the most important to consider are
Structural, Acoustical and Service clearances. Proper
attention should be made at the design stage to ensure
proper structural support. In cases where equipment is
being replaced, be aware of building design to insure
support is adequate for the application.
The next most important consideration in applying
roof top equipment is that of sound from the equip-
ment. Special care should be made to keep the roof
top unit away from sound sensitive areas such as con-
ference rooms, auditoriums and executive offices and
any other room that may have potential for tenant oc-
cupancy. Possible locations could be above hallways,
mechanical or utility rooms.
Finally, service clearances should be maintained in
rooftop design to insure safe access to the unit. Unit
clearances are designed so that technicians have
enough space between units, building walls, and edges
of building to gain access safely. In cases where space
is limited, please call your local Johnson Controls rep-
resentative for additional information.
The clearances shown are to provide
adequate condenser airflow and service
access to inside the unit. Additional clear-
ance should be considered for component
replacement such as compressors, evapo-
rator coils, and supply or exhaust fans.
While it is a common practice to operate
the fan as soon as possible (air movement
during construction) on the job site, the
incomplete ductwork and missing diffuser
grilles will greatly reduce air resistance
and will allow the fan to operate beyond
design parameters. This practice may
result in water carry over and flooding of
the unit. Also, the supply fan motor may
overamp and become damaged.
FIGURE 2 -
UNIT CLEARANCES
LD13267A
NOTES:
1. 10' clearance minimal over the top of the condensing unit.
2. Only one adjacent wall can exceed unit height.
3. 12' clearance required to adjacent units.
4. 8' service access recommended on one side.
5. Economizer and exhaust hoods, where applicable, are
folded inside unit for shipment.
6. Dim. is to outside of lifting lugs.
96"
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