Rooftop Installation - Curb Mounting - Bosch 19 SEER Series Operation Manual

1 2 | Bosch Inverter Ducted Packaged Heat Pump

4.4 Rooftop Installation - Curb Mounting

The manufacturer does not supply roof curbs, they must be fi eld supplied.
On applications when a roof curb is used,the unit must be positioned on
the curb so the front of the unit is tight against the curb (see Figure 10
Roof Curb Dimension).
The default orientation from the factory is for horizontal airfl ow. Convert
the unit to downfl ow using the following procedure:
1. Remove the sheet metal screws securing the supply air cover and
the sheet metal screws securing the return air cover from the base
of the unit. Remove the covers from the base. See Figure 13.
2. Place the covers over the horizontal supply and return openings
(painted side out). Align the screw holes, and secure using the
same screws removed in step 1. See Figure 13.
Install the fi eld-supplied roof mounting curb according to the Installation
Instructions supplied with the curb. Install insulation, cant strips, roofi ng,
and fl ashing. Ductwork must be attached to curb.
NOTICE:

The gasketing of the unit to the roof curb is critical
for a water tight seal. Install gasketing material
supplied with the field supplied roof curb.
Improperly applied gasketing also can result in air
leaks and poor unit performance.
NOTICE:

The unit must be secured to the curb by installing
screws through the bottom of the curb flange and
into the unit base rails.
A-A
B
NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied, as required, to unit being installed.
4. Attach ductwork to curb (flanges of duct rest on curb).
5. Recommended insulated panels: 1 in. (25.4 mm) thick fiberglass 1 lb. density.
Figure 10
Roof Curb Details
CURB 14-1/4"
Table 5 Roof Curb Details - inches
Data subject to change
B C
15-1/4"
Insulation layer
Figure 11 Roof Curb Dimensions
F or units applied with a roof curb, the minimum clearance
may be reduced from 1 inch to 1/2 inch between combustible
roof curb material and supply air duct.
NOTICE: UNIT/STRUCTURAL DAMAGE HAZARD

Failure to follow this caution may result in property
damage. Ensure there is sufficient clearance for
saw blade when cutting the outer horizontal flange
of the roof curb so there is no damage to the roof or
flashing.
A
C
SUPPLY
AIR
1"
A
43-9/16"
D
D
46-1/16" 16"
Installation & Operation Manual
C
RETURN
AIR
E F
42-3/16"
03.2019 | BTC 761701105 A