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Your Furnace (Cont.)
CIRCULATING AIR BLOWER
The blower to circulate room air through the furnace
starts as soon as the internal.heater in the Fan/Limit
control causes the fan switch portion to close com-
pleting the electrical circuit.
It shuts off when the Fan/Limit Control opens the elec-
trical circuit. This means the blower comes on approx-
imately 30 seconds after the fu'rnace first starts and
it continues to run unti] the furnace cools down. This
helps to achieve the maximum comfort and efficien-
cy. from your furnace.
FAN RELAY
This relay provides electric power to the Circulating
Air Blower for continuous blower operation (Ther-
mostat Fan Switch set to "FAN ON") and for the
blower to run if central .air conditioning is installed.
FAN/LIMIT CONTROL
The Fan/Limit Contro! provides power to the Cir-
culating Air Blower to keep it on, until the furnace
cools down. The limit portion provides safety because
it will open the low voltage control circuit, shutting
the furnace down if it gets too hot.
The fan off setting can be adjusted if the fan remains
on long enough that cool drafts are felt in the room
after the furnace shuts off. Contact a Qualified Ser-
vice Technician.
DRAIN TRAP ASSEMBLY
The drain trap has a float in it, that will cause the fur-
nace to shut down if the drain lines become
obstructed. If this happens the trap and lines must be
taken apart and cleaned. See "Condensate Disposal'"
page 10.
Thermostat
Your furnace will not operate properly without a good
quality, correctly installed thermostat. The thermostat
location is very important as it must be sensing
average room temperatures. It must not be exposed
to hot or cold drafts or hot or cold spots on the wall,
such as outside walls or a walt with pipes inside or
openings into attic.
There are many types and styles of thermostats but
the operation is usually similar. BE SURE TO BECOME
FAMILIAR WITH YOUR THERMOSTAT, The simplest
type of thermostat only starts and stops the furnace
to maintain the proper room temperature. The most
widely used types will control both heating and cool-
ing functions and will have a Fan Switch with Auto
and ON settings. On Auto, the Circulating Air Blower
will cycle on/off with the furnace but if, switched to
ON it will run constantly whether or not the furnace
is on.
In addition there are thermostats that automatically
switch from Heating to Cooling and with night set-
backs. The night set-back, or multiple set-back type,
will lower the temperature at night or during the day
when no one is at home.
HEATING:
Posftion the Thermostat System Switch on HEAT, Set
the Fan Switch to AUTO for the blower to cycle
ON/OFF. Sefect desired temperature setting and fur-
nace will automatically start up and shut off as re-
quired to maintain that setting, Fan Switch may be
positioned to ON for continuous air circulation only
if that position maintains the same or a higher blower
speed so you have the same or greater- airflow.
CAUTION
Continuous Fan ON at too slow of a blower speed may
cause improper furnace operation and possible
damage to the heat exchanger,
HEATING ANTICIPATOR:
For more precise comfort control your thermostat may
have an adjustable Heat Anticipator. (Some are not ad-
justable). For most homes the anticipator should be
set on the value listed in the Tech Data Sheet which
is found in the Furnace Technical Support Manual.
If your furnace cycles ON/OFF with very short-ON in-
tervals or _f the OFF cycle is so long that room
temperatures become uncomfortable the anticipator
setting may need to be adjusted.
To Adjust:
Remove thermostat cover and locate anticipator,
Check ,the setting. !f not on.thesetting recommen_
ed for your furnace, moye the lever to the proper set-'
ting and try it.for a day or two,
To lengthen burner-on time move' the indicator
towards "Longer"_ To decrease burner-on time move
in opposite direction,
ira= ii i ii
NOTE :
To accurately determine the effect do not adjust
more than half a scale marking at a time and
I
iI allow a day between adjustments.
I ii iiiiiiii II II III I ' iiiiiiiiiiiiii
COOLING:
For cooling simply position the system switch to
COOL Instead of HEAT and thermostat will function
in the same manner to control cooling.
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