American Standard UY060R9V3W Series Installer's Manual page 14

Installer's Guide
IMPORTANT:
These furnaces may be installed as Direct Vent (sealed combustion) or as Nondirect vent (single pipe). The furnaces are shipped
DIRECT VENT with sealed combustion.
For DIRECT VENT APPLICATION: The furnaces must be vented to the exterior of the house and combustion air MUST come
through the inlet air pipe FROM OUTSIDE AIR. The pipes DO NOT have to exit the exterior of the house together or on the same
side of the house.
For NONDIRECT VENT APPLICATION: The furnace shall be vented to the exterior of the house, but combustion air may enter
from the surrounding area as long as combustion air requirements are met. (See AIR FOR COMBUSTION AND VENTILATION)
FURNACE VENT/INLET PIPE INSTALLATION
There are many different variations of the vent/inlet air pipe
combination. The vent/inlet air combination used for instal-
lation of these furnaces depends on the needs of the location.
However, these guidelines must be followed:
1. The furnace must vent outside the structure.
2. Furnace combustion air requirements must be met for
nondirect, single pipe applications (See example 2
below).
3. For direct vent application of these furnaces, the vent
pipe and air inlet pipe do not have to exit in the same air
space or even on the same surface of the structure.
However, the longest individual pipe will decide the value
for the longest allowable equivalent vent/inlet air length
as shown in the vent length table.
NOTE:
BAYVENT200* accessories can be used for inlet and outlet
terminals when the pipes do not exit the structure together.
The following are EXAMPLES ONLY:
Vent
Air
Inlet
Furnace
EX. 1 —
Example 1 shows that the vent may go vertical while the
inlet air may be on any side of the structure. The vent pipe
would decide the maximum equivalent length for the pipe
depending on the furnace and pipe size.
Vent
Air
Inlet
(See Note)
Furnace
EX. 2 —
Example 2 shows the vent pipe exhausting through the roof
and the inlet air coming from the interior of the house (See
14
Note). The inlet air coming from the interior of the house
must meet combustion requirements for area, etc., as shown
in the section AIR FOR COMBUSTION AND VENTILA-
TION in this Installer's Guide.
Air
Inlet
Furnace
EX. 3 —
Example 3 shows the vent exiting one side of the house while
the inlet air is on the opposite side of the structure. Here the
vent pipe length must be within the allowable length for the
size of furnace and size of the vent pipe. This example
demonstrates that the pipes do not have to exit on the same
side of the structure.
Attic
Vent
Air
Inlet
(See Note)
Furnace
EX. 4 —
The inlet air does not have to come from outside the struc-
ture. Example 4 shows the inlet air (See Note), may come
from the attic if the requirements for combustion air are met
as shown in the section AIR FOR COMBUSTION AND
VENTILATION.
NOTE:
If only the flue gas pipe is to the outside of the structure, a
straight section of pipe (long enough to exit the furnace
cabinet) must be attached to the inlet air side with an elbow
(which is 5 to 10 equiv. ft.) installed on the end to prevent
dust and debris from falling directly into the furnace.
Vent
Vent
18-CD20D3-18