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819288-UIM-A-0212
4 Unitary Products Group
DUCT CONNECTORS
Air supply and return may be handled in one of several ways best
suited to the installation. See Figure 3 for dimensions for duct inlet and
outlet connections.
The vast majority of problems encountered with combination heating
and cooling systems can be linked to improperly designed or installed
duct systems. It is therefore highly important to the success of an instal-
lation that the duct system be properly designed and installed.
Use flexible duct collars to minimize the transmission of vibration/noise
into the conditioned space. If electric heat is used, non-flammable
material must be used.
Where return air duct is short, or where sound may be a problem,
sound absorbing glass fiber should be used inside the duct. Insulation
of duct work is a must where it runs through an unheated space during
the heating season or through an uncooled space during the cooling
season. The use of a vapor barrier is recommended to prevent absorp-
tion of moisture from the surrounding air into the insulation.
The supply air duct should be properly sized by use of a transition to
match unit opening. All ducts should be suspended using flexible hang-
ers and never fastened directly to the structure. This unit is not
designed for non-ducted (freeblow) applications. Size outlet plenum or
transition to discharge opening sizes shown in Figure 3.
FIGURE 3: Gasket Location
FIGURE 4: Dimensions & Duct Connection Dimensions
J
10-3/8”
E
CIRCUIT BREAKER
PANEL
BOTTOM INLET
DIMENSIONS
B
A
K
TOP OUTLET
DIMENSIONS
D
22”
20-1/2”
TABLE 1:
Dimensions
MA
MODELS
Dimensions
Wiring Knockouts
1
ABDEJK
Height Width Power Control
08B
25
17-1/2 16-1/2 14-19/32
7/8” (1/2”)
1 3/8” (1”)
1 23/32” (1 1/4”)
7/8” (1/2”)
12B 17-1/2 16-1/2 14-19/32
14D 24-1/2 23-1/2 21-19/32
16C 21 20 18-3/32
20D 24-1/2 23-1/2 21-19/32
1. Actual size (Conduit size).
Use 1/2" screws to connect ductwork to bottom of unit. Longer
screws will pierce the drain pan and cause leakage. If pilot holes
are drilled, drill only though field duct and unit bottom flange.