Desa Inspecting Burners, Cleaning And Maintenance, Pilot Flame Pattern, Burner Primary Air Holes

INSPECTING BURNERS

Pilot Flame Pattern

Burner Primary Air Holes

Main Burner

CLEANING AND MAINTENANCE

ODS/Pilot And Burner Cleaning Burner Injector Holder and Pilot Air Inlet Hole

19

INSPECTING BURNERS

Check pilot flame pattern and burner flame patterns often.

PILOT FLAME PATTERN

Figure 29 shows a correct pilot flame pattern. Figure 30 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 30

•turn heater off (see To Turn Off Gas to Appliance, page 17 [manu- ally-controlled models] or page 18 [thermostatically-controlled model])

•see Troubleshooting, pages 21 through 23

Pilot Burner Thermocouple Pilot Burner

Propane/LP ThermocoupleNatural Gas

Figure 29 - Correct Pilot Flame Pattern
Pilot Burner Thermocouple	Pilot Burner

Propane/LP Thermocouple Natural Gas

Figure 30 - Incorrect Pilot Flame Pattern

BURNER PRIMARY AIR HOLES

Air is drawn into the burner through the holes in the fitting at the entrance to the burner. These holes may become blocked with dust or lint. Periodically inspect these holes for any blockage and clean as necessary. Blocked air holes will create soot.

MAIN BURNER

Periodically inspect all burner flame holes with the heater running. All slotted burner flame holes should be open with yellow flame present. All round burner flame holes should be open with a small blue flame present. Some burner flame holes may become blocked by debris or rust, with no flame present. If so, turn off heater and let cool. Remove blockage, blocked burner flame holes will create soot.

CLEANING AND

MAINTENANCE

WARNING: Turn off heater and let cool before cleaning.

CAUTION: You must keep control areas, burner, and circulating air passageways of heater clean. Inspect these areas of heater before each use. Have heater inspected yearly by a qualified service person. Heater may need more frequent cleaning due to excessive lint from carpeting, bedding material, pet hair, etc.

ODS/PILOT AND BURNER

• Use a vacuum cleaner or small, soft bristled brush to clean.

CLEANING BURNER INJECTOR HOLDER AND PILOT AIR INLET HOLE

The primary air inlet holes allow the proper amount of air to mix with the gas. This provides a clean burning flame. Keep these holes clear of dust, dirt, and lint. Clean these air inlet holes prior to each heating season. Blocked air holes will create soot. We recommend that you clean the unit every 2,500 hours of operation or every three months.

We also recommend that you keep the burner tube and pilot assembly clean and free of dust and dirt. To clean these parts we recommend using compressed air no greater than 30 PSI. Your local computer store, hardware store, or home center may carry com- pressed air in a can. You can use a vacuum cleaner in the blow position. If using compressed air in a can, please follow the direc- tions on the can. If you don't follow directions on the can, you could damage the pilot assembly.

1.Shut off the unit, including the pilot. Allow the unit to cool for at least thirty minutes.

2.Inspect burner, pilot, and primary air inlet holes on injector holder for dust and dirt (see Figure 31).

3.Blow air through the ports/slots and holes in the burner.

Injector Holder (May Be Brass or Aluminum Depending on Model)

Burner Tube

Primary Air Inlet Holes (Shape of Holes May Vary by Model)

Figure 31 - Injector Holder On Outlet Burner Tube

For morevisit www..com

107068