Rigging And Handling; Clearances; Ductwork; Center Of Gravity - Johnson Controls WW-15 Installation Manual

RIGGING AND HANDLING

Exercise care when moving the unit. Do not remove
any packaging until the unit is near the place of installa-
tion. Rig the unit by attaching chain or cable slings to
the round lifting holes provided in the base rails.
Spreaders, whose length exceeds the largest dimen-
sion across the unit, MUST BE USED. Refer to
Figure 1.
Units may also be moved or lifted with a forklift, from
the side only, providing that an accessory skid is used.
LENGTH OF FORKS MUST BE A MINIMUM OF 90".
Refer to the Physical Data Table 7 for unit weights and
to the Figures 2 or 12 for approximate center of gravity.
Before lifting a unit, make sure that all panels
are in place and that its weight is distributed
equally on all cables so it will lift evenly.
FIGURE 1 - TYPICAL RIGGING
APPROXIMATE

CENTER OF GRAVITY

BACK
(92")
45" (15 TON)
46" (20, 25 TON)
FIGURE 2 - CENTER OF GRAVITY
Johnson Controls Unitary Products
CONDENSER
COIL END
47.5" (15, 20, 25 TON)
136.25"
FRONT
An adhesive backed label is provided over the
outside of the combustion air inlet opening to
prevent moisture from entering the unit, which
could cause damage to electrical components.
Allow this closure label to remain in place until
the combustion air hood is to be installed (refer
to Vent and Combustion Hood Figure 8).

CLEARANCES

All units require certain clearances for proper operation
and service. Installer must make provisions for ade-
quate combustion and ventilation air in accordance
with Section 5.3, Air for Combustion and Ventilation of
the National Fuel Gas Code, ANSI Z223.1 (in U.S.A.)
or Sections 7.2, 7.3 or 7.4 of Gas Installation Codes
CSA-B149.1 (in Canada) and/or applicable provisions
of the local building codes. Refer to Figures 13, 14 and
15 for the dimensions and clearances required for com-
bustible construction, servicing, and proper unit opera-
tion.
Do not permit overhanging structures or shrubs
to obstruct outdoor air discharge outlet, com-
bustion air inlet or vent outlets.

DUCTWORK

Ductwork should be designed and sized according to
the methods in Manual Q of the Air Conditioning Con-
tractors of America (ACCA).
A closed return duct system shall be used. This shall
not preclude use of economizers or outdoor fresh air
intake. The supply and return air duct connections at
the unit should be made with flexible joints to minimize
noise.
The supply and return air duct systems should be
designed for the CFM and static requirements of the
job. They should NOT be sized to match the dimen-
sions of the duct connections on the unit.
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