OPERATING HEATER
Continued
Note: The thermostat sensing bulb measures the temperature of air near the heater cabinet. This may not always agree with room tem- perature (depending on housing construction, installation location, room size, open air tem- peratures, etc.). Frequent use of your heater will let you determine your own comfort levels.
Thermocouple
Yellow Flame
Pilot
Burner
MANUAL LIGHTING PROCEDURE
Figure 25 - Incorrect Pilot Flame Pattern
BURNER FLAME PATTERN
1.Remove front panel (see Figure 4, page 8).
2.Follow steps 1 through 7 under Lighting Instructions, page 15.
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 9, under Lighting Instructions, page 15.
5.Replace front panel.
INSPECTING HEATER
Check pilot flame pattern and burner flame pat- tern often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern. Figure 25 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 25
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 26 shows a correct burner flame pattern. Figure 27 shows an incorrect burner flame pattern. The incorrect burner flame pattern shows yellow tipping of the flame. It also shows the flame higher than 1/2 the deflector panel height.
If burner flame pattern is incorrect, as shown in Figure 27
•turn heater off (see To Turn Off Gas To Appli- ance, page 15)
•see Troubleshooting, page 18
• | turn heater off (see To Turn Off | Gas to Appliance, | Blue | |
Flame | ||||
| page 15) |
| ||
|
| 1/2 | ||
• | see Troubleshooting, page 18 |
| ||
Note: The pilot flame on natural gas units will | Deflector | |||
Height | ||||
have a slight curve, but flame should be blue and | ||||
Figure 26 - Correct Burner Flame Pattern | ||||
have no yellow or orange color. |
|
Blue Flame
Thermocouple
Pilot
Burner
Yellow
Tipping
1 | /2 |
| |
Deflector | |
Height |
Figure 27 - Incorrect Burner Flame
Pattern
Figure 24 - Correct Pilot Flame Pattern
16 | www.desatech.com |