FORM 145.16-IOM2 (0611)
JOHNSON CONTROLS 9
CLEARANCES REQUIRED
For all units allow sufficient clearance for filter
replacement and adequately connecting all duct,
electrical, and piping connections, as well as
service access to key components. Flex duct
collars and quick disconnect hoses are
recommended for ease of servicing.
On Horizontal Units, service doors are located on
all sides of the unit to allow easy servicing of all
components.
On Vertical Units allow for sufficient clearance at
the designated service panels.
UNIT MOUNTING
Vertical units should be mounted level on a
vibration absorbing pad(s) to minimize vibration
transmission through the floor structure. It is not
necessary to anchor the unit to the floor.
Horizontal units are typically suspended above a
ceiling by threaded steel rods, securely anchored
to the building structure. Units should be
supported from the holes in the rail extensions at
the four corners, using steel threaded rods
having a minimum diameter of 3/8 inch. Four
rubber bushings are supplied with the unit to be
placed between the unit and the supporting rods
to absorb vibration.
DUCT CONNECTIONS
Canvas or other types of flexible collars are
recommended for connecting the air ducts to the
unit. The supply air duct collar can be connected
directly to the blower outlet flange. Allowance
must be made in the supply duct for removal of
the first duct section adjacent to the unit, for the
servicing of the blower and motor assembly
Return air may be ducted to the unit or drawn
directly from the ceiling space into the filter.
Supply ducts should be sized for an air velocity of
not more than 1000 feet per minute. Return
ducts should be sized for a velocity of not more
than 700 feet per minute. When the sound level
is critical, it is recommended that both the supply
and return ducts be lined with acoustic insulation
for the first ten feet closest to the unit. The
supply duct should also have at least one elbow
or tee upstream of the first outlet connection for
good sound attenuation.
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