Ductwork - Bosch IDP Premium 18 SEER2 Series Installation Instructions Manual

7 Ductwork

Field ductwork must comply with the National Fire Protection Association NFPA
90A, NFPA 90B and any applicable local ordinance(s).
WARNING: FIRE HAZARD AND CARBON MONOXIDE

Do not, under any circumstances, connect return ductwork
to any other heat producing device such as fireplace insert,
stove, etc. Unauthorized use of such devices may result in
fire, carbon monoxide poisoning, explosion, personal injury
or property. damage.
Sheet metal ductwork run in unconditioned spaces must be insulated and covered
with a vapor barrier. Fibrous ductwork may be used if constructed and installed
in accordance with SMACNA Construction Standard on Fibrous Glass Ducts.
Ductwork must comply with National Fire Protection Association as tested by
U/L Standard 181 for Class I Air Ducts. Check local codes for requirements on
ductwork and insulation.
 Duct system must be designed within the range of external static pressure
the unit is designed to operate against. It is important that the system airflow
be adequate. Make sure supply and return ductwork, grills, special filters,
accessories, etc. are accounted for in total resistance. See airflow performance
tables in Section 5 of this manual.
 Design the duct system in accordance with "ACCA" Manual "D" Design for
Residential Winter and Summer Air Conditioning and Equipment Selection.
Latest editions are available from: "ACCA" Air Conditioning Contractors of
America, 1513 16th Street, N.W., Washington, D.C. 20036. If duct system
incorporates flexible air duct, be sure pressure drop information (straight
length plus all turns) shown in "ACCA" Manual "D" is accounted for in system.
If an elbow is included in the plenum close to the unit, it must not be
smaller than the dimensions of the supply duct fl ange on the unit.
NOTICE:
 The front flange on the return duct (if connected to the blower
casing) must not be screwed into the area where the power
wiring is located. Drills or sharp screw points can damage
insulation on wires located inside unit.

Secure all ducts to roof curb and building structure on downflow discharge
units. Do not connect ductwork to unit. For horizontal applications, unit is
provided with flanges on the horizontal openings. All ductwork should be
secured to the flanges using proper fasteners for the type of duct used and
tape the duct-to unit joint as required to prevent air leaks.
NOTICE:
 When fastening ductwork to the side duct flanges on the unit,
insert the screws through the duct flanges only. DO NOT insert
the screws through the casing. Outdoor ductwork must be
insulated and waterproofed.
Be sure to note supply and return openings. Refer to Figure 3 for
information concerning supply and return air duct dimensions.
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
Figure 13 Rooftop Installation - Frame Mounting
SUPPLY AIR
PANEL
SHEET METAL
SCREWS
Figure 14
Note: Refer to downfl ow conversion instructions provided with the unit
Return Air
Roof Flashing
Figure 15
Typical Rooftop Downfl ow Application with Frame
Installation Instructions
Return Air
Supply Air
Roof Flashing
Angle Iron
Frame
RETURN AIR
PANEL
Supply Air
Roof Flashing
Angle Iron
Frame
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