7
Combustion Air (Direct Vent/Dual Pipes)
WARNING
It is vitally important that the furnace have proper
venting. To prevent possible death or personal injury
due to asphyxiation, this furnace must never be
common vented with another gas fired appliance.
Any alteration to any venting system must be in
accordance with local and national codes, and the
manufacturer's instructions.
In direct vent installations (dual pipes), the air for com-
bustion and ventilation is obtained from outdoors through
an air intake pipe. Observe the following precautions
concerning air availability:
• To ensure proper furnace operation, both the air in-
take pipe and the flue pipe must never become ob-
structed.
• The combustion and ventilation air must never
come from a corrosive atmosphere.
Flue Pipe and Condensate Drainage
WARNING
To prevent possible death or personal injury due to
asphyxiation, Amana Condensing Gas Fired Warm
Air Furnaces must be Category IV vented.
The venting of this furnace (Category IV venting) must
be both gas and water tight. For proper performance,
the size, length, number of elbows, and termination must
be in accordance with the specifications outlined in the
furnace installation guide. The flue system must slope
towards the furnace for proper condensate drainage.
The flue pipe and its termination must be kept clear of
blockage. For further information on Category IV vent-
ing, refer to the installation instructions accompanying
this product. If not included, ask your installing dealer or
distributor for this information.
Provisions must be made to drain condensate from the
furnace and protect the condensate drain trap and drain
lines from freezing conditions. The drain trap and drain
lines must be kept clear of blockage.
Indoor Humidity
Relative humidity is the amount of water vapor in the air
relative to the amount the air can hold at the same
temperature. Example: At 40% relative humidity, the air
could hold 2 1/2 times as much moisture (2.5 x 40 =
100%) before becoming saturated.
The colder the air; the less moisture it can hold. As air is
warmed, its ability to hold moisture is increased.
Example: A winter day, outdoor temperature 10°F, and
relative humidity of 70%. If that air enters a home and is
warmed to 72°F the relative humidity will drop to 6%
(very dry) if no more moisture is added.
Relative humidity is important to your health and home
as proper humidification helps reduce respiratory difficul-
ties and helps improve the indoor air quality.
A good relative humidity is one just high enough to barely
start condensation along the lower edges or lower
corners of the windows. More than that can be damag-
ing.
Frequent fogging or excessive condensation on inside
windows indicates the indoor humidity level is too high
for outdoor weather conditions. Damage to the building
may result if the condition persists. (Condensation on
inside of storm windows indicates loose inside windows.
Adding weather-stripping to tighten inside windows
usually corrects this problem.)
The following table shows the recommended maximum
indoor humidity in relationship to the outdoor tempera-
tures.
Temperature
° F.
Humidity
+20° 35%
+10° 30%
0° 25%
-10° 20%
-20° 15%
Table 1
General Information
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