Circuit Board - Harman Super-Magnum Owner's Manual

Super-Magnum Coal Stoker Stove

2. Circuit Board

As stated previously, the circuit board is a microprocessor, which means it has the ability to "think" and adjust itself based
on both reported temperatures and demand temperature. The circuit board also has the ability to self-diagnose when things
are not happening as they should be.
Power Light
Indicates power to the
control.
Status Light
Will be lit in either stove
or room temp mode when
pointer is not within off
position band except after
normal shut down. Blinks to
indicate errors listed below.
Indicates power to the
distribution blower.
Indicates power to the
combustion blower
Indicates power to the feed
motor.
Temperature Dial;
Allows you to adjust the
room temperature in Room
Temp Mode using the outer
scale marked in degrees
Fahrenheit. It also allows
you to adjust the stove
temperature while in Stove
Temp Mode using the inner
scale marked from 1 to 7.
Status Light Error Messages
3-Blinks: Indicates that the ESP has gone out of range too
many times. Could be an indicator of build up of ash, etc.
in the flue pipe or heat exchange. Perform a Manual Reset.
4-Blinks: Indicates that the room sensor circuit is not
complete. May mean a poor connection or short in the
sensor wire. (Will only occur in "Room Temp" mode.)
Manual Reset: Turn the mode selector to "OFF", and
disconnect power for a second. Restore power and return
to original setting.
20 Do Not Burn Wet Coal!
Dealer Diagnostic Port
For dealer maintenance only. Requires special DDM
monitor supplied to Harman Dealers exclusively.
Circuit Board Dipswitches: On the face of the circuit board,
there is a block of 8 switches. These "ON-OFF" switches
are used to set the times and temperatures for the different
models of stove. For this model, switches numbered 5, 7 and
8 should be on, with the rest of them off. NEVER ADJUST
THESE SWITCHES YOURSELF, AS SERIOUS ISSUES
COULD DEVELOP. Also know that if there is a need to
Feed adjuster
Sets the maximum feed
rate
Test
Runs all motors at full speed
for one minute to check
operation. After two minutes
the stove will go to minimum
burn and the blowers will
alternate from high to low
every minute to remind you
that you are still in "Test
Mode".
Distribution Blower speed
adjustment range.
L = low
H = high
Variable speed anywhere
between L and H; although
as the stove temp. goes up,
so does the low end of the
scale.
Mode Selector
A l l o w s y o u t o c h o o s e
between Room Temp Mode,
Stove Temp Mode, or OFF.
Also allows you to vary the
distribution blower speed by
turning the knob to the high
or low side of each mode.
replace an ESP probe, a switch
change may also be needed. It
is strongly recommended to have
a trained service representative
make any repairs to the appliance.
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