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3. Turn control knob clockwise to the OFF position. 4. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP! Follow “B” in the safety information, column 1. If you don.t smell gas, go to the next step. 5. Turn control knob counterclockwise to the PILOT position. Press in control knob for five (5) seconds (see Figure 21). Note: You may be running this heater for the first time after hooking up to gas supply. If so, the control knob may need to be pressed in for 30 seconds or more. This will allow air to bleed from the gas system. • If control knob does not pop up when released, contact a qualified service person or gas supplier for repairs. Ignitor Button Control Knob OFF PILOT Figure 21 - Control Knob In The OFF Position 114683-01B OPERATING HEATER Continued 6. With control knob pressed in, push down and release ignitor button. This will light pilot. The pilot is attached to the front of burner. The pilot is attached to the front of the burner. If needed, keep pressing ignitor button until pilot lights. Note: If pilot does not stay lit, refer to Troubleshooting, page 20. Also contact a qualified service person or gas supplier for repairs. Until repairs are made, light pilot with match. To light pilot with match, see Manual Lighting Procedure. 7. Keep control knob pressed in for 30 seconds after lighting pilot.After 30 seconds, release control knob. • If control knob does not pop up when released, contact a qualified service person or gas supplier for repairs. Note: If pilot goes out, repeat steps 3 through 7. This heater has a safety interlock system. Wait one (1) minute before lighting pilot again. 8. Turn control knob counterclockwise to desired heating level. The main burner should light. Set control knob to any heat level between 1 and 5. CAUTION: Do not try to adjust heating levels by using the equipment shutoff valve. Ignitor Electrode Pilot Burner Thermocouple Figure 22 - Pilot (actual pilot may vary) TO TURN OFF GAS TO APPLIANCE Shutting Off Heater 1. Turn control knob clockwise to the OFF position. 2. Turn off all electric power to the appliance if service is to be performed. Shutting Off Burner Only (pilot stays lit) Turn control knob clockwise to the PILOT position. THERMOSTAT CONTROL OPERATION The thermostatic control used on these models differs from standard thermostats. Standard thermostats simply turn on and off the burner. The thermostat used on this heater senses the room temperature. The thermostat adjusts the amount of gas flow to the burner. This increases or decreases the burner flame height. At times the room may exceed the set temperature. If so, the burner will shut off. The burner will cycle back on when room temperature drops below the set temperature. The control knob can be set to any heat level between 1 and 5. Selecting the 5 setting will cause the burner to remain fully on without modulating down in most cases. Note: The thermostat sensing bulb measures the temperature of air near the heater cabinet. This may not always agree with room temperature (depending on housing construction, installation location, room size, open air temperatures, etc.). Frequent use of your heater will let you determine your own comfort levels. MANUAL LIGHTING PROCEDURE 1. Remove front panel (see Figure 7, page 9). 2. Follow steps 1 through 5 under Lighting Instructions, page 16. 3. With control knob pressed in, strike match. Hold match to pilot until pilot lights. 4. Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob. Now follow step 8, under Lighting Instructions, column 1. 5. Replace front panel. 114683-01B INSPECTING HEATER Check pilot flame pattern and burner flame pattern often. PILOT FLAME PATTERN Figure 23 shows a correct pilot flame pattern. Figure 24 shows an incorrect pilot flame pattern. The incorrect pilot flame is not touching the thermocouple. This will cause the thermocouple to cool. When the thermocouple cools, the heater will shut down. If pilot flame pattern is incorrect, as shown in Figure 24 • turn heater off (see To Turn Off Gas to Appliance, page 16 or 17) • see Troubleshooting, page 20 Note: The pilot flame on natural gas units will have a slight curve, but flame should be blue and have no yellow or orange color. Thermocouple Pilot Burner Blue Flame Figure 23 - Correct Pilot Flame Pattern Thermocouple Yellow Flame Pilot Burner Figure 24 - Incorrect Pilot Flame Pattern BURNER FLAME PATTERN WARNING: If yellow tipping occurs, your heater could pro- duce increased levels of carbon monoxide. NOTICE: Do not mistake orange flames with yellow tipping. Dirt or other fine particles enter the heater and burn causing brief patches of orange flame. Figure 25 shows a correct burner flame pattern. Figure 26 shows an incorrect burner flame pattern. The incorrect burner flame pattern shows yellow tipping of the flame. It also shows the flame higher...
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