Service Manual for Thermador Pro Grand Dual Fuel Ranges:
PRD304EG,
PRD364EDG, PRD364EDPG, PRD364ELG, PRD366EG, PRD366EPG, PRD484ECG, PRD484EEG, PRD486EDG, PRD486EDPG, PRD486ELG
58300000157422_ARA_EN_A
Page 15 of 95
3.6 Adjusting Rangetop Burner Valves Manually
Figure 16: Bypass Screw on Valve (View with Control Panel Removed
for Clarity)
1
Bypass screw on XLO valve and standard valve
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 the valves.
3.6.1 Special Tools Needed
To reposition the bypass screws for minimum flow settings on
manual valves, use a precision high-strength blade screwdriver,
with a 1/8 inch [3.0mm] wide, .020-inch [0.50mm] thickness tip.
3.6.2 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.
For newer models:
Remove and retain the two bezel mounting
screws and remove the bezel.
4.
For older models:
Valve screws can be accessed directly
through the control panel, without removing the bezel mounting
screws.
5. To engage the valve screw, insert the precision screwdriver with a
1/8 inch blade into the same hole in the bezel that was created by
the removal of the
right side
mounting screw (see Figure 18,
6. Turn the valve screw clockwise just until "bottom out" position is
reached. Do not over-tighten the valve screw (see Figure 18).
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.
NOTE:
The griddle/grill is controlled by a thermostat and does not
have a valve that requires adjustment.
Gas Leaks
With electrical power off, carefully check for gas leaks at each gas
component that was removed, replaced, or otherwise serviced
using a gas leak detector or bubble test. For XLO valves (not
standard valves), you may need the electrical power to be on
when testing for gas leaks.
Use extreme caution
when
performing gas leak testing on XLO valves.
