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OPERATING HEATER
12
Lighting Instructions (Cont.)
To Turn Off Gas To Appliance
Thermostat Control Operation
Manual Lighting Procedure
INSPECTING BURNERS
OPERATING HEATER
Continued
Note: You may be running this heater for the first time
after hooking up to gas supply. If so, the control knob may
need to be pressed in for 30 seconds or more. This will al-
low air to bleed from the gas system.
6. With control knob pressed in, press and release ignitor but-
ton. This will light pilot. The pilot is attached to the front
burner. If needed, keep pressing ignitor button until pilot lights.
Note: If pilot does not stay lit, contact a qualified service
person or gas supplier for repairs. Until repairs are made,
light pilot with match. To light pilot with match, see Manual
Lighting Procedure, column 2.
7. Keep control knob pressed in for 30 seconds after lighting
pilot. After 30 seconds, release control knob.
• If control knob does not pop out when released, contact a
qualified service person or gas supplier for repairs.
Note: If pilot goes out, repeat steps 3 through 7. This heater
has a safety interlock system. Wait one (1) minute for sys-
tem to reset before lighting pilot again.
8.
Turn control knob counterclockwise
ing level. The burners should light. Set control knob to any
heat level between HI and LO.
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
Ignitor Button
Figure 16 - Control Knob and Ignitor Button Location
Pilot Burner
Figure 17 - Pilot
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise
Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise
For more information, visit www.desatech.com
For more information, visit www.desatech.com
to desired heat-
C-clockwise
Control Knob
Thermocouple
to the OFF position.
Clockwise
to the PILOT position.
Clockwise
THERMOSTAT CONTROL
OPERATION
The thermostat control knob can be set to any comfort level
between HI and LO. The thermostat 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, page 11.
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 in Lighting Instructions, column 1.
INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 18 shows a correct pilot flame pattern. Figure 19 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 19
• turn heater off (see To Turn Off Gas to Appliance, column 1)
• see Troubleshooting, pages 14 through 16
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
Thermocouple
Figure 18 - Correct Pilot Flame
Pattern (Propane/LP Shown)
Pilot Burner
Thermocouple
Figure 19 - Incorrect Pilot Flame
Pattern (Propane/LP Shown)
111487-01A
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