Inspecting Burners, Thermostat Control Operation

OPERATING HEATER

Continued

TO TURN OFF GAS

TO APPLIANCE

Shutting Off Heater

Turn control knob clockwise to the OFF position.

Shutting Off Burners Only (pilot stays lit)

Turn control knob clockwise to the PILOT position.

THERMOSTAT CONTROL

OPERATION

The thermostat control knob can be set to any comfort level between HI and LO. The ther- mostat will gradually modulate the heat output and ﬂame height from higher to lower settings or pilot, in order to maintain the comfort level you select. The ideal comfort setting will vary by household depending upon the amount of space to be heated, the output of the central heating system, etc.

Note: Selecting the HI setting with the control knob will cause the burner to remain fully on, without modulating down in most cases.

MANUAL LIGHTING

PROCEDURE

1.Follow steps 1 through 5 under Lighting Instructions on page 21.

2.Depress control knob and light pilot with match.

3.Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob. Now follow step 8 under Lighting Instructions, page 21.

INSPECTING BURNERS

Check pilot ﬂame pattern and burner ﬂame pat- terns often.

PILOT FLAME PATTERN

Figure 30 shows a correct pilot ﬂame pattern. Figure 31 shows an incorrect pilot ﬂame pat- tern. 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 31

•turn heater off (see To Turn Off Gas to Appli- ance, page 20 [manually-controlled models] or page 22 [thermostatically-controlled model])

•see Troubleshooting, page 25

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.

Pilot Burner	Pilot Burner
Thermocouple
Propane/LP	Natural Gas
Figure 30 - Correct Pilot Flame Pattern
Pilot Burner	Pilot Burner

Thermocouple
Propane/LP	Natural Gas

Figure 31 - 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.

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Desa Inspecting Burners, Thermostat Control Operation, Pilot Flame Pattern, Main Burner

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