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5151094-UIM-H-0220
DUCTWORK
NOTICE
All units are shipped in the horizontal supply/return configuration. It is
important to reduce the possibility of any air leakage through the bot-
tom duct covers (resulting from cut, torn, or rolled gasket) due to
improper handling or shipping processes. To ensure a good tight
seal, it is recommended that silicone caulk and/or foil tape be applied
along the cover edges.
These units are adaptable to downflow use and rear supply and return
air duct openings. To convert to downflow:
1. Remove the duct covers found in the bottom return and supply air
duct openings. There are four screws securing each duct cover (save
these screws to use in Step 2).
2. Install the duct covers (removed in Step 1) to the rear supply and
return air duct openings. Secure with the four screws used in Step
1.
3. Seal duct covers with silicone caulk.
Duct work should be designed and sized according to the methods of
the Air Conditioning Contractors of America (ACCA), as set forth in their
Manual D.
Use a closed return duct system. This does not preclude use of econo-
mizers or ventilation air intake. Flexible duct connectors are recom-
mended in the supply and return duct work to minimize the transmission
of vibration and noise.
CAUTION
!
When fastening duct work to the side duct flanges on the unit, insert
the screws through the duct flanges only. DO NOT insert the screws
through the casing. Outdoor duct work must be insulated and water-
proofed.
NOTICE
Be sure to note supply and return openings.
See Figures 4 and 5 for information concerning rear and bottom supply
and return air duct openings.
FILTERS
Proper filter size is very important. Filter size, type, and pressure drop
should always be considered during duct system design.
It is the responsibility of the installer to secure a filter in the return air
ductwork or use the filter rack.
A filter rack kit is included with all three-phase units.
Filters must always be used and must be kept clean. When filters
become dirt laden, insufficient air is delivered by the blower, decreasing
your unit's efficiency and increasing operating costs and wear-and-tear
on the unit and controls.
Check filters monthly. This is especially important because this unit is
used for both heating and cooling.
6
D
16
C
RETURN
A
AIR DUCT
B
SUPPLY
A
AIR DUCT
Model
A
All
14
13.5
FIGURE 4: Bottom Duct Dimensions (in.)
Model
All
FIGURE 5: Rear Duct Dimensions (in.)
VIEW LOOKING UP
1.75
AT BOTTOM OF UNIT
E
F
A0343-001
B
C
D
E
5
3.5
47.5
A
B
13.6
14
Johnson Controls Ducted Systems
F
42
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