Furnace User Manual 2019
4
Carbon monoxide or “CO” is a colorless and odorless gas
produced when fuel is not burned completely or when the
ame does not receive sucient oxygen.
1. Headaches, Nausea, Dizziness, Flu-like symptoms.
2. Excessive humidity, heavily frosted windows or a
moist “clammy” feeling in the home.
3. Smoke from a replace will not draw up the chimney.
4. Flue gases that will not draw up the appliance vent
pipe.
The air for combustion and ventilation can also (where
local codes permit) be obtained from the surrounding
unconned space or louvered closet door. Observe the
following precautions concerning air availability:
• When a furnace is installed in a closet and the closet
door is louvered, DO NOT OBSTRUCT LOUVERS.
Louvers must be open and clear to provide combustion
air to the furnace.
• When a furnace is installed in a conned space within
a home and the air for combustion and ventilation
enters the space through ducts from the outside, be
sure to routinely check the entering and outlet, grilled
openings to verify that they are always clear and
clean.
• Do not partition o a small area around the furnace
utilizing a non-louvered door. This could obstruct the
combustion air from reaching the furnace.
Relative humidity is the amount of water vapor in the
air relative to the amount the air can hold at the same
temperature. The colder the air; the less moisture it can
hold. As air is warmed, its ability to hold moisture is
increased. Relative humidity is important to your health and
home as proper humidication helps reduce respiratory
diculties 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 damaging.
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 a poor seal 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 temperatures.