formthistestinthekitchen,cookingvaporsmayproduce
inaccurateresults.)
Agoodrelativehumidityisonejusthighenoughtobarelystart
condensationalongtheloweredgesor lowercornersofthe
windows,whenitiscoldoutside.Morethanthatcanbedamaging.
If thehumidityistoohigh,trythesesuggestionstolowerthe
humidity:
1.Reducesettingordiscontinueuseofhumidifier.
2.Userangeandbathroomexhaustfanswhilecookingand
bathing.Openadoororwindowforafewminutestobring
incooldrierair.
3.Cookwithpanscovered.
4.Takeshorterbathsorshowerswithcoolerwater.
5.Installafreshairintakeduct.Cold,dryairbroughtinfrom
outsidetothefurnacearealowerstheindoorhumiditylevel.
6.Haveapplianceschecked.Amalfunctioningappliancecan
contributewatervaportothestructure.
7.Iftheproblemcontinues,consultaheatingcontractorabout
addinga heatrecoveryventilatororair-to-airheatex-
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.
I!
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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