Form I-MAPSIII&IV, P/N 222917R9, Page 23
5.4.3 Duct Furnace
Curb Sections,
Option JH30 for
Cabinet C and Option
JH25 for Cabinet B
If installing a MAPS
®
gas heat Model RDCB, RDCC, RDDB or RDDC that includes a
curb section with a duct furnace, the curb section with the duct furnace must be set on
the roof curb BEFORE placing the MAPS
®
unit. Option JH30 and JH25 will work with
downow roof curb Option CJ31 and horizontal ow roof curb Options CJ49, and CJ50.
Verify the following before placing the duct furnace curb section on the installed
roof curb:
□If ductwork is being installed from the top (Roof Curb Option CJ31), slide the duct-
work down into the discharge and return air openings. See FIGURE 7C, page
13, for duct connection sizes. Ductwork should be sized slightly smaller with a
minimum 3/4" duct ange that will rest on all sides of the duct connection. See
Paragraph 6.4 for duct connection requirements.
□Apply 1/4" x 1-1/4" foam sealant tape to both the top surface of the curb rails
and the top surface of the perimeter of the duct opening(s), being sure to make
good butt joints at all corners. The sealant tape must be applied to prevent water
leakage into the curb area due to blown rain and capillary action.
□ When it is time to lift the duct furnace, be sure that the required preparations have
been made. IMPORTANT: Before lifting, verify that the duct furnace will be placed
in the correct orientation to mate properly with the discharge air opening.
Access Panel for
Duct Furnace
Gas Supply Entrance
for Duct Furnace
Control Access Panel
for Duct Furnace
Corner “X”
Corner “Y”
Corner
“Z”
Corner
“W”
(4) Lifting Lugs
Combustion Air Intake Panel
Screened Flue
Outlet (Vent)
FIGURE 11A - Set an Optional Duct Furnace Curb Section directly
on the Roof Curb (either CJ31, CJ49, or CJ50)
Approximate Weights
JHUP 250 - 530lbs (240kg)
JHUP 300 - 830lbs (376kg)
Corner Weights
JHUP 250 300
Corner lbs kg lbs kg
"W" 158 72 228 103
"X" 158 72 231 105
"Y" 107 49 185 84
"Z" 107 49 186 84
NOTE: Curb duct furnaces
may be used only with roof
curbs CJ31, CJ49 or CJ50.
Duct furnace curb sections
cannot be installed with an
optional energy recovery
module.
Using all four lifting points (either the lifting
lugs or the corner holes in the base) and
being sure the orientation is correct, set the
duct furnace on the prepared roof curb. Fol-
low safe lifting procedures.
NOTE: Duct furnace curb section adds 23-1/8
(587mm) to the overall height of the installa-
tion.
Duct Furnace
Burner Access Door
Combustion Air Inlet
Flue Outlet
Control
Door
A
8-1/16”
(205mm)
14-25/32” (375mm)
26-7/8”
(683mm)
mounted
height
32-1/8”
(816mm)
B
C
Return
Air
Duct
F
D
E
Gas
Supply
Heat Exchanger in
Discharge Duct
Top
View
End View
Side View
Duct
Furnace
A B C D E F
inches (mm) inches (mm) inches (mm) inches (mm) inches (mm) inches (mm)
JHUP 250 57-1/16 (1449) 78-3/19 (1981) 76-1/2 (1937) 15-1/2 (394) 37-1/2 (953) 16-17/32 (267)
JHUP300 66-17/32 (1741) 113 (2870) 111-1/16 (2821) 16-1/2 (419) 48 (1219) 15-1/32 (382)
FIGURE 11B -
Dimensions of
an Optional Duct
Furnace Curb
Section
Dimensions (inches/mm) - Option JHUP25 and
JHUP30 Curb Section Duct Furnaces
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