Multi F Engineering Manual

Horizontal Installation
• Units must be installed so that the access panels face to the side,
not facing up or down.
• Installation must be in accordance with all relevant building codes,
which will necessitate the installation of an external condensate
pan (position the unit in or above the external condensate pan).
• If the units are going to be suspended, use angled steel support
brackets with threaded rods to provide support from the bottom.
The brackets / threaded rods must be comparatively bigger / longer
than the unit, and each must be centered on the part of the frame
it supports.
• If the unit will not be suspended, still use angled steel support
brackets, but also add vibration isolators (field supplied) to avoid
sound transmission. If necessary, provide the installing contractor
with an illustration of where the vibration isolator must be added
and how it must be positioned.
• Unit must be positioned properly for plenum / duct installation.
• Plenum must be strong and secure enough to support the installa-
tion of adapter collars to accommodate duct work.
To ensure proper drainage for horizontal installations, unit must be installed within ±1/8 inches level of the unit’s length and width.
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Vertical (Upflow) Installation
• Unit must be positioned properly for plenum / duct installation.
• To maintain proper air flow, minimum height clearance is 14 inches.
• Plenum must be strong and secure enough to support the installation of adapter collars to accommo-
date duct work.
• Air handler platform must be sturdy enough to support the frame, plus any accessories (e.g., filter box).
• To prevent air leaks, seal all duct work according to local codes, but make sure that filter access is still
unobstructed.
• Vibration isolators (field supplied) must be installed between the unit frame and the platform. If neces-
sary, provide the installing contractor with an illustration of where the vibration isolator must be added
and how it must be positioned.
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Use > 6 Screws (M4*25L)
Field Supplied
Return Air Duct /
Plenum
>1 inch
Field Supplied
Supply Air Duct
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Attaching the Bottom Duct.
B
A
C
>1-1/2 inch x 1-1/2 inch Angle
Recommended length >26 inches
with a 2-inch clearance on both
sides of the unit
>3/8 inch Threaded Rod
Field-Supplied
Supply Air Duct
Field Supplied
Return Air Duct / Plenum
Suspension Bolt Locations
Capacity
(Btu/h)
Dimensions (inches)
ABC
24,000
4 23 41-11/32
36,000
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7DEOHBracket / Bolt Position Dimensions.
TWO-WAY VAHU INDOOR UNITS
Installation and Best Layout Practices
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150 | VERTICAL-HORIZONTA L
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F