107068-01EFor more information, visit www.desatech.comFor more information, visit www.desatech.com18OPERATING HEATER Thermostatically-Controlled ModelsLighting Instructions (Cont.)To Turn Off Gas To ApplianceThermostat Control OperationManual Lighting ProcedureOPERATING HEATERContinuedCAUTION: Do not try to adjust heating levels byusing the equipment shutoff valve.5. Turn control knob counterclockwise C-clockwise to the PILOTposition. Press in control knob for five (5) seconds (see Fig-ure 27).Note: You may be running this heater for the first timeafter hooking up to gas supply. If so, the control knob mayneed to be pressed in for 30 seconds or more. This will al-low air to bleed from the gas system.• If control knob does not pop out when released, contacta qualified service person or gas supplier for repairs.6. With control knob pressed in, press and release ignitor but-ton. This will light pilot. The pilot is attached to the frontburner. If needed, keep pressing ignitor button until pilot lights.Note: If pilot does not stay lit, contact a qualified serviceperson or gas supplier for repairs. Until repairs are made,light pilot with match. To light pilot with match, see ManualLighting Procedure.7. Keep control knob pressed in for 30 seconds after lightingpilot. After 30 seconds, release control knob.Note: If pilot goes out, repeat steps 3 through 7. This heaterhas a safety interlock system. Wait one (1) minute for sys-tem to reset before lighting pilot again.8. Turn control knob counterclockwise C-clockwise to desiredheating level. The burners should light. Set control knob toany heat level between HI and LO.LOHIOFFPilotFigure 27 - Control Knob and Ignitor Button LocationFigure 28 - PilotControl KnobIgnitor ButtonThermocoupleIgnitor Electrode Pilot Burner Ignitor Electrode PilotBurnerTO TURN OFF GASTO APPLIANCETHERMOSTAT CONTROLOPERATIONThe thermostat control knob can be set to any comfort levelbetween HI and LO. The thermostat will gradually modulatethe heat output and flame height from higher to lower settings,or pilot, in order to maintain the comfort level you select. Theideal comfort setting will vary by household depending upon theamount of space to be heated, the output of the central heatingsystem, etc.Note: Selecting the HI setting with the control knob will cause theburner to remain fully on, without modulating down in most cases.1. Follow steps 1 through 5 under Lighting Instructions be-ginning on page 17.2. Depress control knob and light pilot with match.3. Keep control knob pressed in for 30 seconds after lightingpilot. After 30 seconds, release control knob. Now followstep 8 under Lighting Instructions, column 1.MANUAL LIGHTINGPROCEDUREPropane/LP Natural GasShutting Off HeaterTurn control knob clockwise Clockwise to the OFF position.Shutting Off Burners Only (pilot stays lit)Turn control knob clockwise Clockwise to the PILOT position.