Service Manual for the Thermador Pro Harmony Range, Model PRL364GDH/01
58300000154022_ARA_EN_D
Page 12 of 68
3.3
Testing Burner Ignition
3.3.1 Testing Cooktop Burner Ignition
Ignition Hazard
Do not touch the cooktop burners when the igniters are sparking.
For each burner, push the control knob in and then turn counter-
clockwise to
HI
. The igniter should produce a clicking sound as the
burner is sparking, and the burner should light within four seconds.
3.3.1.1
Testing the HI Setting
Set the burner knob to
HI
, and observe flame characteristics
(see Figure 9). If any burner flame burns primarily yellow, verify if the
burner cap is positioned properly on the burner base, and then re-test.
If flame characteristics do not improve, call Thermador technical
support at (800) 444-9091.
3.3.1.2
Testing the SIM Setting
Set the burner knob to
SIM
. Make sure that the flame completely
surrounds the burner. There should be a flame at each burner port
and there should not be an air gap between the flame and the burner.
If the flame does not extend completely around any of the burners,
call Thermador technical support at (800) 444-9091.
3.3.1.3
Testing the XLO Setting
The left-front and left-back burners have the XLO feature. Set the
burner knob to
XLO
and observe if the flame cycles correctly - on for
approximately 8 seconds, and then off for 52 seconds of each minute.
3.3.2 Testing Bake Burner Ignition
Set the oven to
BAKE
at 350° F. After 30
–75 seconds the burner
should ignite and stay lit until 350° F is reached. Then it should shut
off. From this point forward, the burner should cycle on and off to
maintain the temperature.
NOTE:
The air shutter for the bake burner is factory pre-set at a fully-
opened position for all conditions, and does
n’t require adjustment.
3.3.3 Testing Broil Burner Ignition
Set the mode to
BROIL.
After 30
–75 seconds the burner should
ignite. The infrared ceramic broiler does not require any adjustment.
3.4
Manually Setting Burner Valves
Although pre-adjusted, if you need to set the XLO valves and
standard valves for the lowest possible flame setting, then manually
adjust the bypass screws on all valves.
3.4.1 Tools Needed
■ T-20 driver
■ A precision high-strength blade screwdriver, with 1/8 inch (3.0mm)
wide, .020 inch (0.50mm) thickness tip should be used to
reposition the bypass screws for minimum flow settings on manual
valves.
3.4.2 Adjusting the Bypass Screws
1. Turn off electrical power by unplugging the power cord, or putting
the circuit breaker in the
OFF
position.
2. Remove knobs from valve stems by slowly pulling knobs straight
out, away from control panel.
3. Remove and retain the bezel mounting screw located to the right
of the valve stem, using a T-20 driver (see Figure 10, page 13).
4. To engage the valve screw, insert the precision screwdriver with
1/8-inch blade into the same hole in the bezel that was created by
the removal of the mounting screw (see Figure 11, page 13).
5. Turn the valve screw clockwise just until "bottom out" position is
reached. DO NOT over-tighten the valve screw (see Figure 11).
NOTE:
The two valves for XLO operation (farthest left on control
panel) must be in the
OFF
position for proper access to the valve
screws through clearance holes in the XLO potentiometers.