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Installation Instructions
4.4 Rooftop Installation - Curb Mounting
The manufacturer does not supply roof curbs, they must be fi eld supplied. Refer
to Figure 11 for recommended roof curb dimensions. 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.
The default orientation from the factory is for horizontal airfl ow. Convert the unit to
downfl ow using the following procedure:
1.
Remove sheet metal screws from both the supply air and return air panels.
Refer to Figure 14.
2.
Add foam tape on the perimeter of the non painted side of each panel.
3.
Move and re-secure the panels to the downfl ow location using the sheet
metal screws from step 1.
For more information, refer to the the Conversion Kit Manual included with each
heat pump unit.
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.
CAUTION:
The unit must be secured to the curb by installing screws
through the bottom of the curb flange and into the unit
base rails.
NOTES:
1. Roof Curb must be set up for unit being installed
2. Seal strip must be applied, as required, to unit being installed
3. Attach ductwork to curb (flanges of duct rest on curb)
4. 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
1 2 |
A ― A
B
B
C
14"
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
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
INSULATION LAYER
C
SUPPLY
RETURN
AIR
1"
A
43-1/2"
D
D
46-1/16"
16"
C
AIR
E
F
30-5/8"
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