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5. Startup and Operation
Once setup properly, the XT 75 is designed to operate reliably over a wide range of conditions
with minimal adjustment. This section is provided to make sure that the heater is set up
properly, and to provide instructions on the initial startup.
5.1 Do's and Don'ts/Tech Tips
1. Read each procedure completely before performing the steps.
2. Fill the tank with used (not new) motor oil or transmission fluid.
3. Do not put gasoline or other unapproved substances in the tank. Refer to Section 1.4 for
more information.
4. Do not place fuel suspected of having debris, such as an oil dry product, into the tank.
5. Store this manual in an accessible location.
6. PERFORM THE RECOMMENDED PERIODIC MAINTENANCE.
5.2 Burner Primary Control Operation
The burner operation is governed by the Primary Control which is set to a 30 second trial for
ignition and a 2-minute post purge (burner off delay) after a call for heat.
• The two T-Terminals are for the thermostat signal. To simulate a closed thermostat, you can
jumper across the two T terminals with an alligator clip.
• The two F-Terminals are for the cad cell signal. The cad cell is a light sensor inside the burner that
senses the flame. To simulate a flame, you can jumper across the two F terminals with an alligator
clip.
Do not leave the T and F terminals jumped during normal furnace operation, as this
bypasses several safety checks and may cause excessive oil to be deposited in the combustion
chamber, creating a fire or explosion hazard. For the same reason, do not leave the T and F terminals
jumped for more than 30 seconds if oil is being sprayed but not being burned.
• The reset button is used to reset the controller, in case of a failed start attempt or flameout.
• The LED(s) are used to indicate proper furnace operation or errors.
Primary Control
Reset Button
Call 1-888-370-6531 for Technical Support
Burner Primary Control
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