Thermostat Control - Desa CDR3924NT Owner's Operation And Installation Manual

OPERATING HEATER
Continued
5. Turn control knob counterclockwise
to the PILOT position. Press in control
knob for five (5) seconds (see Figure 21).
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 thermostat 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 front burner
should light. Set control knob to any heat
level between HI and LO.
9. To light the rear yellow flame burner, push
in and turn rear burner control knob coun-
terclockwise
CAUTION: Do not try to adjust
heating level of rear burner. Rear
burner control knob should be in ON
or OFF positions only. Do not oper-
ate with rear burner control knob
between ON or OFF positions.
Ignitor Button
Control Knob Rear Burner
Figure 21 - Control Knob(s) and Ignitor
Button Locations
113183-01F
to the ON position.
Control Knob
www.desatech.com
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
Ignitor
Electrode
Pilot Burner
Thermocouple
Figure 22 - Pilot
(Propane/LP)
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise
OFF position.
2. Turn rear burner control knob clockwise
to the OFF position.
Shutting Off Burners Only (pilot stays lit)
1. Turn control knob clockwise
PILOT position.
2. Turn rear burner control knob clockwise
to the OFF 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, starting on page 16.
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 steps 8 and 9
under Lighting Instructions, column 1.
Thermocouple
Pilot Burner
Figure 23 - Pilot
(Natural)
to the
to the
1