Desa HRB3624 Owner's Operation And Installation Manual page 21

OPERATING HEATER
Continued
5. Turn control knob counterclockwise
to the PILOT position. Press in control
knob for five (5) seconds (see Figure 28).
Note: You may be running this heater for
the first time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
6. With control knob pressed in, press and
release ignitor button. 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.
• 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 system to
reset before lighting pilot again.
8. Turn control knob counterclockwise
to desired heating level. The burners should
light. Set control knob to any heat level
between HI and LO.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
Ignitor Button
Figure 28 - Control Knob and Ignitor
Button Location
119426-01A
Control Knob
www.desatech.com
Ignitor Electrode
Thermocouple
Figure 29 - Pilot
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise
OFF position.
Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise
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 burner to remain fully on,
without modulating down in most cases.
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 5 under Lighting
Instructions, page 20 .
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.
Pilot
Burner
to the
to the
21