Harman Stove Company SF2600A - Manual (Page 11)


duct work and Operating Instructions
duct work.
This figure 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 flapper door (B). The flapper door opens to feed
more air to the fire and closes to reduce the air to the fire. The maximum air flow
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 flapper door is in the closed position. The idle adjuster
(D) controls the minimum amount of air that enters the firebox when the flapper
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 00 degrees, it’s function is to close
the automatic draft control flapper door if the temperature in
the plenum reaches 00 degrees. do not change this setting.
The center pointer adjusts the temperature at which the blower
starts. A good initial setting for this is 50 degrees. The pointer
on the left is to adjust the temperature at which the blower
stops. A good initial setting for this pointer is 00 to 0 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 flapper door. This allows air into the firebox,
which raises the output of the fire. 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 flapper door, thus, reducing the output of the fire. 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 fire 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 fire 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