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form this test i nthe kitchen, cooking vapors may produce
inaccurate
results.)
A good r elative humidity isone justhigh enough tobarely start
condensation
along thelower edges or lower corners of the
windows,
when i tiscold outside. More than t hat c an bedamaging.
If thehumidity is toohigh, t rythese s uggestions
to lower t he
humidity:
1.Reduce setting ordiscontinue
use ofhumidifier.
2.Use range a nd bathroom
exhaust fans while cooking and
bathing. Open a door o rwindow f orafew minutes tobring
incool drier a ir.
3.Cook w ith pans c overed.
4.Take s horter baths orshowers
withcooler water.
5.Install afresh a irintake duct. Cold, dryairbrought infrom
outside tothe furnace area l owers the indoor humidity level.
6.Have a ppliances
checked.
A malfunctioning
appliance
can
contribute
water vapor tothe structure.
7.If the problem continues,
consult aheating contractor
about
adding a heat r ecovery ventilator or air-to-air h eat e x-
changer.
About
Your Furnace
Fig. 2 shows
the location
of the components
in the furnace.
Circulating
Air Blower
The blower
circulates
room air through
the furnace
air ducts,
and
into the
rooms
of the
structure.
The
blower
can be set at the
thermostat
for automatic
or manual
operation.
In manual
mode the
blower
operates
continuously.
In automatic,
the blower
does not
come on until a preset time after the gas valve is energized.
When
the structure
reaches
the
temperature
set on the
thermostat,
the
furnace
will shut off. The blower
will continue
to run until the
furnace
cools down.
Thermostat
There
are many
types and styles of thermostats.
Most thermostats
control
both heating
and cooling
functions
and have a Fan Switch
with
AUTO
and
ON settings.
On
AUTO,
the
Circulating
Air
Blower
will cycle
on/off
with
the furnace
on the heating
speed
unless
a call for cooling
is initiated.
Blower
speed will correspond
to the mode
of operation
of the furnace.
If the Fan
Switch
is
positioned
to ON the blower
will run continuously.
In addition
some thermostats
are programmable
with
multiple
set
backs. The set backs can be pre-programmed
to lower or raise the
temperature
automatically.
Be sure to become
familiar
with your thermostat,
Rating Plate
The
rating
plate
contains
important
information
for the service
technician
and lists the complete
model,
manufacturing
and serial
numbers.
You
should
always
provide
all these
numbers
when
requesting
parts or if you need service.
See Fig. 2 for rating
plate
location.
Door Interlock
Switch
All the electrical
power
for the furnace
goes
through
the door
interlock
switch.
The interlock
switch
interrupts
electrical
power
to
the furnace when the blower
door is removed.
The furnace will not
operate
until the blower
door is reinstalled.
Furnace
Control
The furnace
control provides
power
to the circulating
air blower
to
keep it on until the furnace
cools down.
The fan off-delay
setting can be adjusted
if the fan remains
on long
enough
that cool drafts are felt in the room
after the furnace
shuts
off.
Furnace Vent Pipe (Vent Pipe Connec-
tions through Side Panel on Some
Manual Gas Shutoff Valve
Vent Pipe Grommet
Ignitor & Flame Sensor
(not shown)
Vent Drain Fitting
Combustion Blower
1/2"
I.D. Vent Pipe Drain Hose -._ _;
5/8"1.D. Transition Box Drain Hose
Air Intake Pipe
..........(Required only for Direct-Vent
Furnaces)
..... Primary Heat Exchanger
Furnace Main Gas Control Valve
Heat Exchanger
Door Interlock Switch
Condensate Trap
Diagnostic Light--
Furnace Control-
.J
Rating Plate - .......
Pressure Switches
(some models have one)
Plastic Transition Box
Circulating Air Blower
Representative drawin9only, some models may vary in appearance.
Fig. 2 - Component
Locations
for Condensing
90+ Furnaces
A09280
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