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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; "Stove Temp" 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 Manual
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.
1. ESP (Exhaust Sensing Probe)
The ESP is a tiny thermistor located in the exhaust stream. The probe chang-
es 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.
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 tempera-
tures and demand temperature. The circuit board will also flash a code se-
quence on the Status light if an error is detected.
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 detected.
Indicates power to distribution blower.
Indicates power to combustion blower.
Indicates power to the feed motor.
Indicates power to the igniter.
Low Draft Adjustment Screw
(see page 26)
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
Stove Temp Mode using the inner scale marked from 1 to 7.
24
Pellets or Corn/Pellet Mixture Only
Dealer Diagnostic port
For dealer maintenance only.
Requires special DDM monitor
supplied to Harman Dealers
exclusively.
3-90-775
P35i Fireplace Insert
ESP Location
feed adjuster
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 and the distribution
blower will alternate from high to low
every minute to remind you that you
are still in "Test Mode".
Igniter switch
Set to appropriate Start-Up mode.
mode selector
Allows you to choose 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.
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.
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