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12 USSC
After installation of the furnace is complete, it is ready for
operation. The Honeywell Limit Control, in conjunction
with a wall thermostat, operates the distribution blowers
and the motorized draft on the front of the furnace. The
limit control is located on the rear of the furnace in the
upper left corner and is accessible by removing the two
screws in the cover plate. DO NOT operate your furnace
with this plate removed! The control can be adjusted to
your desired blower On/Off times. The factory settings are
100/150/200.
The wall thermostat setting operates the ON time of the
motorized draft. If the temperature is below the setting on
the wall thermostat, the motorized draft will come open.
(Recommended setting at 5 to 10 degrees higher than
other heating thermostats.)
The rst two set points on the limit control operates the
distribution blower. When the furnace plenum reaches
the second set point on the limit control, the distribution
blower will come on. If the temperature falls to the rst
set point, the distribution blower will shut-off. The distribu-
tion blower is a three speed blower and can be manually
adjusted by means of the three position switch located
behind the sliding access panel on the cold air return box.
When the furnace reaches the third set point on the limit
control, the draft blower will shut-off. The draft blower will
come back on if the temperature falls below the setting
on the wall thermostat.
1. Check the motorized draft by turning the room thermo-
stat up high enough so that the motorized draft opens.
Then lower the thermostat setting to ensure it closes off.
2. Use a sheet of newspaper to test your draft by placing
it inside the furnace and lighting it.
With completion of the tests above, you are ready to light
the furnace. Follow the operating steps.
Open all draft controls on your furnace. Pull the slide
bafe forward.
Place about 10-15 lb. of coal in on the shaker grates. It
should come up to about half of the rst rebrick level.
Place crumpled paper over the coal and crisscross a
couple handfuls of dry kindling wood 3/4” in thickness
on top of paper.
Ignite the paper and close loading door. Wait about 30
minutes until coal re is established before adding more
coal. NOTE: NEVER load coal over the level of rebrick.
Close by-pass damper and set all draft controls to your
own needs. It may take 3 to 4 coal res to determine
how your local coal and the Clayton Furnace reacts
together. Adjusts drafts accordingly.
When loading with a good bed of coals in the morning
- Open by-pass damper.
1. In normal shaking, only rock the grates a small amount
to sift ash through. Do not agitate the re bed too
often. This practice will waste coal. If glowing coal is
visible in the ash pan, you have shaken to much.
2. Remove all ashes every day from ash pit.
CAUTION: Ashes should be placed in a metal container with
a tight tting lid. The closed container of ashes should be
placed on a non-combustible oor or on the ground well
away from all combustible materials pending nal disposal.
If the ashes are disposed of by burial in soil or otherwise
locally dispersed, they should be retained in the closed
container until all coals have thoroughly cooled.
3. With your poker, push hot burning embers to the rear
of the unit and add green coal in front. NEVER load
over height of rebrick. This can result in damage to
your furnace and home.
4. Close by-pass damper.
Too much draft air will cause clinkering of coal and will
waste heat up the chimney. Shut draft down to as low
a point as you can and still heat your home.
1. NOTE: Never stand in front of loading door when
opening it. Stand to the side.
2. NEVER completely cover the live re with fresh coal.
Always leave a generous area of glowing coal at the
top of the re and at the rear.
3. Always keep the ash pit clean.
CAUTION: Never use gasoline, gasoline-type lantern fuel,
kerosene, charcoal lighter uid, or similar liquids to start or
“freshen up” a re in the furnace. Keep all such liquids well
away from the furnace while it is in use.
1. Open spin draft cap on ash door.
2. Pull the slide bafe rod to the front position.
3. Open the fuel load door and light re using kindling and
several sheets of newspaper, then close the furnace door.
The furnace door should remain closed for 5 to 10 minutes
in order to establish the re. If the re has established, you
are ready to load the furnace.
CAUTION: To prevent ame and smoke spillage, the slide
bafe must be pulled out and the fuel door must be cracked
for ten seconds before being fully opened.
Do not over re your furnace! After you have become
familiar with its operating, you should know how much
wood to use.
4. Load the furnace, close the load door and push the slide
Bafe rod to rear.
5. Close the spin draft cap on ash door, leaving it cracked
about the diameter of a dime.
6. The motorized draft cycles (opened & closed) on demand
from the wall thermostat. Setting the U.S. Stove thermo-
stat four degrees higher than your existing thermostat is
recommended. In operation, the power draft will remain
open until the U.S. Stove thermostat temperature setting is
reached. Then it will close to reduce combustion air. If the
furnace looses power, the draft will automatically close.
CAUTION: To avoid excessive temperatures, do not
operate with fuel door or ash pan open.
TESTING AND OPERATING PROCEDURES
TESTING
GENERAL FURNACE OPERATION
STARTING A COAL FIRE
Shut off FAD when fuel door is open
STARTING A WOOD FIRE
Using Motorized Natural Draft