Desa S26PTA Operating Heater, Inspecting Burners, Continued, To Turn Off Gas To Appliance, Pilot

OPERATING HEATER

Continued

Ignitor Electrode

Thermocouple Pilot Burner

Figure 20 - Pilot

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 burners to remain fully on, without modulating down in most cases.

MANUAL LIGHTING

PROCEDURE

1.Follow steps 1 through 5 under Lighting Instructions, page 14.2.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 Lighting Instructions, page 14

Inspecting Burners

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

PILOT FLAME PATTERN

Figure 21 shows a correct pilot flame pattern. Figure 22 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 22

•turn heater off (see To Turn Off Gas to Appliance)•see Troubleshooting, page 18

Note: The correct pilot flame on natural gas units will have a slight curve, but flame should be blue an have no yellow or orange color.

Thermocouple Pilot Burner

Figure 21 - Correct Pilot Flame Pattern

(Natural Gas Shown)

Thermocouple Pilot Burner

Figure 22 - Incorrect Pilot Flame Pattern

(Natural Gas Shown)

Burner FLAME PATTERN

Figure 23 shows a correct burner flame pattern. Figure 24 shows an incorrect burner flame pattern. If burner flame pattern is incorrect,

•turn heater off (see To Turn Off Gas to Appliance)

•see Troubleshooting, page 18

Approx. 3-6" Above Top of Logs

Figure 23 - Correct Flame Pattern with

Control Knob Set to High Flame

More

Than 8"

Above

Top of

Logs

Figure 24 - Incorrect Flame Pattern with

Control Knob Set to High Flame

110361-01G www.desatech.com 15