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Save These Instructions
3-90-775R36_09/15
C. General Operating Information
The P35i's ESP control will maintain an output level to fit your temperature demands. There are two modes of operation;
"Constant Burn" mode, where the control will maintain a specified constant temperature, regardless of the surrounding
environment temperature conditions, Or "Room Temp" mode, where the control will adjust the rate of burn to meet a
specified room temperature setting. You also have the choice of Automatic or
Disabled ignition. Regardless of the mode selected, operation is controlled by
both, exhaust temperature- being reported by the ESP (Exhaust Sensing Probe),
and the microprocessor circuit board.
We'll discuss these control devices and their functions now.
ESP (Exhaust Sensing Probe)
The ESP is a tiny thermistor located in the exhaust stream. The probe changes it's
thermal resistance based on minute changes in temperature, which is monitored
by the circuit board and used to determine the need for changes in the burn rate
to meet the temperature demand.
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 will also flash a code sequence on the
Status light if an error is detected.
Feed Limit
Sets the maximum feed rate.
Test
Runs all motors at full speed for one
minute to check operation. Afterwards
the combustion blower will remain on
low burn voltage.
Temp 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 "Constant Burn"
Mode using the inner scale marked from 1 to 7.
Mode Selector
Allows you to choose between "Room
Temp" Mode, "Constant Burn" 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.
Distribution Blower speed adjustment
range. L = low
H = high
Variable speed anywhere between
L and H; although as the stove
temperature goes up , so does the
low end of the scale.
Power Light
Indicates power to the control.
Indicates power to the feed motor.
Indicates power to combustion blower.
Status Light
Will be lit in either "Constant Burn" or
"Room Temp" mode when pointer is
not within off position band except after
normal shut down. Blinks to indicate
errors detected.
Indicates power to distribution blower.
Dealer Diagnostic Port
For dealer maintenance
only. Requires special DDM
monitor supplied to Harman
®
Dealers exclusively.
Low Draft Adjustment Screw (see
page 26)
Indicates power to the igniter.
Igniter switch
Set to appropriate Start-Up mode.
ESP Location
