Harman Stove Company P35I owner manual C. General Operating Information, ESP Exhaust Sensing Probe

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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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.

Igniter switch

Set to appropriate Start-Up mode.

ESP Location

P35i Fireplace Insert

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.

Dealer Diagnostic Port

For dealer maintenance only. Requires special DDM monitor supplied to Harman Dealers exclusively.

24 Pellets or Corn/Pellet Mixture Only 3-90-775