Installation, Operation & Maintenance Manual
Bosch 96% AFUE Gas Furnace
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Bosch Thermotechnology Corp.
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04.2019
Data subject to change
7.2.2 Horizontal Applications
Horizontal applications, in particular, may dictate many of the installation’s
specifi cs such as airfl ow direction, ductwork connections, fl ue and combustion
air pipe connections, etc. The basic application of this furnace as a horizontal
furnace diff ers only slightly from an upright installation. When installing a furnace
horizontally, additional consideration must be given to the following:
Drain Trap and Lines
In horizontal applications the condensate drain trap is secured to the furnace side
panel, suspending it below the furnace.
A minimum clearance of 7 inches below the furnace must be provided
for the drain trap.
Additionally, the appropriate downward piping slope must be maintained from the
drain trap to the drain location. Refer to Section “Condensate Drain Line & Drain
Trap”.
NOTICE:
If the drain trap and drain line will be exposed to
temperatures near or below freezing, adequate measures
must be taken to prevent condensate from freezing. In this
scenario, it is recommended to add foam insulation around
the drain line, and heat tracing may also be necessary
based on the application.
Leveling
Leveling ensures proper condensate drainage from the heat exchanger and induced
draft blower. For proper fl ue pipe drainage, the furnace must be level lengthwise
from end to end. The furnace should also have a slight tilt with the access doors
downhill ((minimum 1/2 (12.7 mm) to maximum of 3/4 (19 mm)) from the back
panel. The slight tilt allows the heat exchanger condensate, generated in the
recuperator coil, to fl ow forward to the recuperator coil front cover.
Refer to Figure 9.
Alternate Electrical And Gas Line Connections
This furnace has provisions allowing for electrical and gas line connections through
either side panel. In horizontal applications the connections can be made either
through the “top” or “bottom” of the furnace.
Drain Pan
A drain pan must be provided if the furnace is installed above a conditioned area.
The drain pan must cover the entire area under the furnace (and air conditioning
coil if applicable).
Furnace Suspension
If the furnace is installed in a crawl space it must be suspended from the fl oor joist
or supported by a concrete pad. Never install the furnace on the ground or allow it
to be exposed to water. See Furnace Suspension for further details (See Fig. 10).
