OPERATING HEATER

Continued

THERMOSTAT

OPERATION

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.

Blue Flame

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. At times the room may

Thermocouple

Pilot Burner

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 2 comfort level between HI and LO. All plaques will turn off and on.

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 7, page 8).

2.Follow steps 1 through 5 under Lighting Instructions, page 16.

3.With thermostat control knob pressed in, strike match. Hold match to pilot until pilot lights.

4.Keep thermostat control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob. Follow step 8 under Lighting Instructions, page 16.

5.Replace front panel.

INSPECTING HEATER

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

PILOT FLAME PATTERN

Figure 25 shows a correct pilot flame pattern. Figure 26 shows an incorrect pilot flame pattern. The incor- rect 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 26

turn heater off (see To Turn Off Gas to Appli- ance, page 15, depending on your model)

see Troubleshooting, page 19

Figure 25 - Correct Pilot Flame Pattern

 

Yellow Flame

Thermocouple

Pilot Burner

 

Figure 26 - Incorrect Pilot Flame Pattern

BURNER FLAME PATTERN

Figure 27 shows a correct burner flame pattern. Fig-

ure 28 shows an incorrect burner flame pattern.

If burner flame pattern is incorrect, as shown in

Figure 28

 

turn heater off (see To Turn Off Gas to Appli- ance, page 15, depending on your model)

see Troubleshooting, page 19

Figure 27 - Correct Burner Flame Pattern

Figure 28 - Incorrect Burner Flame Pattern

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Desa CRN30 installation manual Inspecting Heater, Thermostat Operation, Pilot Flame Pattern, Burner Flame Pattern

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