Inspecting heater, Operating heater – Desa VSL18NT User Manual

Page 16

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Figure 24 - Correct Burner Flame Pattern

Yellow
Tipping

Figure 25 - Incorrect Burner Flame

Pattern

1

/

2

Deflector
Height

Blue
Flame

1

/

2

Deflector
Height

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.

MANUAL LIGHTING

PROCEDURE

1. Remove front panel (see Figure 6, page 9).

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 22 shows a correct pilot flame pattern.

Figure 23 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 23
• turn heater off (see To Turn Off Gas to Appliance,

page 15)

• see Troubleshooting, page 18
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.

Figure 24 - Incorrect Pilot Flame Pattern

Figure 23 - Correct Pilot Flame Pattern

Thermocouple

Pilot
Burner

Thermocouple

Blue Flame

Yellow Flame

Pilot
Burner

OPERATING HEATER

Continued

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 24 shows a correct burner flame pattern.

Figure 25 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 25
• turn heater off (see To Turn Off Gas To Appli-

ance

, page 15)

• see Troubleshooting, page 18

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