39
Increase CO2
Decrease CO2
Low Fire
Adjustment
Clockwise
Counter-
Clock Wise
TH 292 – 392
Figure 28: TH 292 – 392 Gas Valve
To adjust the high-fire setting on the standard display
Press and hold the ‘Next’ button for 3 seconds to enter the
diagnostic menu on the TH Control Panel. Press ‘Next’ until
the following screen appears:
Figure 29: High Fire Adjustment Screen
To return to normal operation press ‘Done’.
To adjust the high-fire setting on the upgraded display
1) Press the
button
2) Select Test and press
3) Select Forced Rate and press
4) Select Set High Fire
Locate the high-fire adjustment screw on the top side of the
gas valve. The screw can be identified by a red cylinder
casing around the screw. Turn the screw 1/8 turn in either
way for each adjustment to keep track of the adjustments.
After adjusting the screw wait a moment for the combustion
levels to stabilize before attempting to make any further
adjustments. Continue this procedure until combustion levels
are satisfied.
Increase CO2
Decrease CO2
High Fire Adjustment
Counter-Clock
Wise
Clockwise
To adjust the low fire setting
Press and hold the ‘Next’ button for 3 seconds to enter the
diagnostic menu on the TH Control Panel. Press ‘Next’ until
the following screen appears:
Figure 30: Low Fire Adjustment Screen
To return to normal operation press ‘Done’.
To adjust the low fire setting on the upgraded display
1) Press the
button
2) Select Test and press
3) Select Forced Rate and press
4) Select Set Low Fire
The TH should respond immediately and fire at 1500 RPM.
When this is achieved locate the low fire adjustment screw.
When the correct combustion values are achieved replace
the screw cap back on to the gas valve.
Increase CO2
Decrease CO2
Low Fire Adjustment
Clockwise
Counter-Clock
Wise
TH 502
Figure 31: TH 502 Gas Valve
To adjust the high-fire setting on the standard display
Press and hold the ‘Next’ button for 3 seconds to enter the
diagnostic menu on the TH Control Panel. Press ‘Next’ until
the following screen appears:
Figure 32: High Fire Adjustment Screen
To return to normal operation press ‘Done’.
To adjust the high fire setting on the upgraded display
1) Press the
button
2) Select Test and press
3) Select Forced Rate and press
Low-fire air gas ratio adjustment
(use Torx 40 for adjustment,
clockwise increases CO
2
)
High-fire air gas ratio adjustment (Use
slotted screwdriver for adjustment,
counter-clockwise increases CO
2
)
Low-fire air/gas ratio adjustment, use
slotted screwdriver for adjustment,
clockwise increases CO
2
Lift top cover to access high fire
air/gas ratio adjustment (use 3mm
allen key for adjustment, counter-
clockwise increases CO
2)
Gas Inlet
