Harman Stove Company SF1500A Stove User Manual


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11
Duct Work and Operating Instructions
Duct Work.
Thisgureshowsatypicalduct
system layout. Be sure the entire sys-
tem is properly sized to provide the cor-
rect static pressure for optimum blower
performance. Have any new duct sys-
tem designed by a HVAC professional.
Operating Instructions
Adjusting Automatic Draft
Control - In order for your new furnace
to function, the controls must be prop-
erly adjusted. The heat output is regu-
lated by the automatic draft control, on
thebottomdoorofthefurnace.Refertotheillustrationsatright;Theelectricdraft
motor(A)opensandclosestheapperdoor(B).Theapperdooropenstofeed
moreairtothereandclosestoreducetheairtothere.Themaximumairow
can be adjusted by turning the adjuster bolt (C) counter-clockwise for more air and
clockwise for less air. NOTE: To preserve motor life, all adjustments of this bolt
shouldbedonewhiletheapperdoorisintheclosedposition.Theidleadjuster
(D)controlstheminimumamountofairthatentersthereboxwhentheapper
door is closed. Adjustment is made by turning the adjuster vertical for zero air, or
horizontal for maximum idle air. It is best to start at a medium setting as shown at
right.
Adjusting the fan control- Shut off the power at the circuit breaker be-
fore removing the fan control cover. Make sure the copper jumper (circled below)
is removed before using the furnace. Note the three pointers on the dial. The one on
the right is the high limit adjustment. Pre-set at 200 degrees, it’s function is to close
theautomaticdraftcontrolapperdoorifthetemperaturein
the plenum reaches 200 degrees. Do not change this setting.
The center pointer adjusts the temperature at which the blower
starts. A good initial setting for this is 150 degrees. The pointer
on the left is to adjust the temperature at which the blower
stops. A good initial setting for this pointer is 100 to 110 degrees.
If it is set too low, the air will feel cool coming out of the registers
at the end of the blower cycle.
Thermostat- Set the thermostat to the desired tempera-
ture. When more heat is needed, the thermostat opens the au-
tomaticdraftcontrolapperdoor.Thisallowsairintotherebox,
whichraisestheoutputofthere.Whenthetemperatureinthe
plenum reaches the set temperature of the center pointer on the
fan control, the blower will begin blowing heated air through the
ductwork. When the thermostat reaches it’s setpoint, the automatic draft control closes
theapperdoor,thus,reducingtheoutputofthere.Asthetemperatureintheple-
num drops to the set point of the left pointer on the fan control, the blower will stop. A
solidfuelrecannotceaseoutputimmediately,therefore,yourroomtemperaturemay
exceed the thermostat setting at times. You also may notice times that the blower runs
for a short period even though the draft control is closed. Again, you can’t just stop a
woodorcoalreinstantly,andtemperaturemaybuildenoughtoruntheblower.Thisis
normal and will be noticed more with coal than with wood.
MED
MAX
ZERO
Return Air
Supply Trunk
Plenum
Figure 5
Figure 6
Figure 7
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