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111160-01A
For more information, visit www.desatech.com
For more information, visit www.desatech.com
20
INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 39 shows a correct pilot flame pattern. Figure 40 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 40
• turn heater off (see To Turn Off Gas to Appliance, page 18
[manually-controlled models] or column 1 [thermostat-con-
trolled models])
• see Troubleshooting, pages 22 through 24
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 39 - Correct Pilot
Flame Pattern
Figure 40 - Incorrect Pilot
Flame Pattern
Thermocouple
Pilot Burner
Thermocouple
Pilot Burner
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
burners to remain fully on, without modulating down in most cases.
1. Follow steps 1 through 5 under Lighting Instructions,
page 19.
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, column 1.
MANUAL LIGHTING
PROCEDURE
Figure 37 - Control Knob and Ignitor Button Location
Figure 38 - Pilot
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
LO
HI
OFF
P
ilo
t
Control Knob
Ignitor Button
OPERATING HEATER
Continued
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise
Clockwise
to the OFF position.
Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise
Clockwise
to the PILOT position.
Thermocouple
Pilot Burner
Ignitor Electrode
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.
7. Keep control knob pressed in for 30 seconds after lighting
pilot. After 30 seconds, release control knob.
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
C-clockwise
to desired
heating level. The burners should light. Set control knob to
any heat level between HI and LO.
OPERATING HEATER (Thermostatically-Controlled Models)
Lighting Instructions (Cont.)
To Turn Off Gas to Appliance
Thermostat Control Operation
Manual Lighting Procedure
INSPECTING BURNERS
Pilot Flame Pattern