035-18548-001-B-0203
8
Unitary Products Group
DUCT CONNECTIONS
All ducts should be designed and installed in accor-
dance with all national and/or local codes.
Refer to Figure 3 for suggested method of connecting
supply air ductwork.
Ducts should be sized no smaller than the duct flanges
on the unit or the electric heater (if used). Refer to the
unit dimensions (Figure 14) and the heater detail (Fig-
ure 4) for these sizes. Refer to Form 035-16602-001
for installation instructions on the electric heater.
Use flexible fiber glass or plastic cloth collars or other
non-flammable material at the unit duct connections to
minimize the transmission of noise and vibration.
Insulate all ductwork running through unconditioned
areas to prevent moisture condensation and to provide
more economical operation.
The return air duct flange is factory-mounted on the
front of the unit, but it can be reversed with the solid
bottom panel for horizontal applications.
A supply air plenum (Figure 5), a base (Figure 6) and a
return air grille (Figure 7) are available as field-installed
accessories, and one of the following respective
instructions will be packed with each.
PN 035-16650-001 - Supply Air Plenum
PN 035-16621-001 - Return Air Grille
PN 035-16632-001 - Base
The supply air plenum and the return air grille should
be used in lieu of ductwork only when a free blow/free
return application is practical.
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FIGURE 3 - SUPPLY AIR DUCT CONNECTIONS
AIR
OUT
NON-FLAMMABLE
COLLAR
FLANGEDDUCT
CONNECTION
(FIELD
FABRICATED)
DUCT
SUPPLYAIR
DUCTFLANGE
BLOWERGASKET
(BYINSTALLER)
FIGURE 4 - ELECTRIC HEATER ACCESSORY
(VERTICAL ARRANGEMENT SHOWN)
FIGURE 5 - SUPPLY AIR PLENUM ACCESSORY
(VERTICAL ARRANGEMENT SHOWN)
FIGURE 6 - BASE ACCESSORY
(FOR VERTICAL ARRANGEMENT
ONLY)
1" DUCT FLANGE
HEATER ELEMENT
CHAMBER
CONTROL BOX
ACCESS PANEL
SUPPLY
AIR
A
VERTICAL ARRANGEMENT
SHOWN
B
BLOWER
UNIT
ALTERNATE
AIR DISCHARGE
BLOWER
UNIT
SUPPLY
AIR
TOP
PANEL
GRILLE
VERTICAL
ARRANGEMENT
SHOWN
Plenum should be field mounted on the supply air end of blower
units for either vertical or horizontal application. For rear discharge,
rotate plenum 180 degrees. For horizontal discharge on a horizontal
unit, the grille panel and the top panel will be arranged differently.
Refer to Form
for installation and assembly instructions.
035-16650-001
BLOWER
UNIT
BLOWER UNIT
BASE PANEL
FOR VERTICAL
ARRANGEMENT
ONLY
WHEN OUTDOOR AIR IS REQUIRED, A HOLE CAN BE
CUT IN BACK PANEL FOR CONNECTING DUCTWORK.
