Bulletin 100-155 — Page 2
© Copyright 2010 Heat Controller, Inc.
series of 2-inch or 2 ½ inch ducts as a stream of air that
entrains and mixes the room air. This process of aspira-
tion produces a more even temperature distribution in
the room.
The SDAH Series consist of a motor, blower wheel,
housing, controls, and an option of either a heat pump or
chilled water coil. For additional options, the SDAH
series features a latching mechanism for easy installation
of a Hot Water Coil module and/or Horizontal Return
Air Module. This series of air handlers must be installed
in the horizontal flow position to allow for proper drai-
nage (See Fig. 1).
All insulated modules feature closed-cell insulation for
improved sound attenuation. There is no exposed fiber-
glass insulation.
SDAH module is available in three sizes: 24, 36, and 48.
The SDAH24 is sized for 1.5-2.0 tons, SDAH36 is sized
for2.5- 3 ton, and the SDAH48 is sized for a 3.5-4 tons.
The coils can be arranged to provide only the options
needed as shown in Figure 1 (with details on page 14).
Heating-only systems require the blower with a heat
pump coil, and a hot water coil. Cooling-only systems
include the blower with the heat pump coil used for
cooling. For heating and cooling use the refrigerant coil
with the hot water coil module or electric furnace.
Heat Controller blowers feature direct drive motors that
are located in the air stream. Each blower wheel is ba-
lanced to Heat Controller specifications. The blowers
feature a quick twist-and-lock motor mount for easy
maintenance (see page 16). The motorized blower as-
sembly consists of the motor, which is mounted to the
inlet ring, and the wheel, which is fastened to the motor
shaft.
OPTIONS
Other options and modules are also available to add
additional features or to simplify installation. These in-
clude an electric duct furnace, hot water coil module,
and a horizontal return air module. Please refer to the
latest Heat Controller Catalog for information on these
and other options.
UNPACKING
All Heat Controller products are inspected prior to
shipping and are carefully packaged in individual car-
tons. Inspect all cartons prior to unpacking. Notify car-
rier of any damage.
Open each carton and inspect unit for visible signs of
concealed damage and notify carrier of any such dam-
age.
All materials are sold FOB Factory and it is the respon-
sibility of the consignee to file any claims with the deli-
vering carrier for materials received in damaged condi-
tion.
LOCATION
Design the system layout to minimize the number of
plenum elbows and fittings while keeping the supply
duct runs as short as possible. (See Bulletin 100-250,
Component Duct Layout Design). Provide minimum
clearance on both sides for servicing the unit as shown in
Fig. 2.
If installing the unit in an attic, avoid placing the unit
above a bed. The ideal location is above a central hall, a
closet, a bathroom, or any normally unoccupied space.
The unit can also be installed in a closet, crawlspace, or
basement. If the local codes allow, the unit may be in-
stalled in the garage provided the ductwork is well
sealed, especially the return duct. Although the unit is
not designed for outdoor use, it may be located outside
provided adequate weather protection is used; typically a
roof installation requires mounting on blocks with a
sheet metal cover or cap to protect the unit from rain and
extreme weather conditions.
Be sure to position the return air box and filter near the
unit allowing at least one 90° bend in the return duct for
proper acoustical performance (refer to figure 3 for a
typical attic installation). The section on Return Air
Ducts in the manual provides more details.
Figure 1. Basic Module Arrangement (refer to detail figures shown on Page 15)
Table 1. Return Air Box Opening
Models Return Air Box
Part No.
Size of opening
inches (mm)
24 SD-01-24
14
38
×25 ½ (365 ×648)
36 SD-01-36
14 38×30 12(365 ×775)
48 SD-01-48
24 38×30 12(619 ×775)
Heating or Cooling w/ Chilled Water Coil Only
Horizontal
Flow
Heating or Cooling w/ Heat Pump Coil Heat Pump Coil w/ Hot Water Coi
IL00010E.cvx
