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Reznor RECC Unit Installation Manual User Manual

Page 23

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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

downflow roof curb Option CJ31 and horizontal flow 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 flange 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 (V

ent)

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