If the boiler installation contains more than 1 module, each boiler module will be tted with individual
gas valves, all gas valves must be adjusted independently.
Note: The procedure for each boiler module will be the same, the ue gas analyser must be connected to each
boiler ue prior to its’ connection into any common ue header.
Maximum rate adjustment (Throttle)
1. Switch the boiler on and operate for 5 minutes.
2. Set the module to maximum output.
3. Connect a suitable ue analyser to the ue sampling point of the boiler.
4. Using the maximum rate adjustment screw, adjust the master module gas valve, if necessary,
until the CO
2
measures 9.5% ± 2.5 (nb. clockwise reduces CO
2
).
Minimum rate adjustment (Offset)
5. Set the module to minimum output.
6. Connect a suitable ue analyser to the ue sampling point of the boiler.
7. Remove the protective cap and then using the offset adjustment screw, adjust the valve on the
boiler until the CO
2
value measures 9.5% ± 2.5 (nb. anti-clockwise reduces CO
2
level).
Note: The offset adjustment is more sensitive than the throttle adjustment.
IMPORTANT NOTE: The CO measurement when the CO
2
is set, should not exceed 50 ppm. Under no
circumstances should the CO/CO
2
ratio exceed 0.004.
Adjust in steps of no more than 1/8 turn and wait 1 minute after each adjustment to allow setting to
stabilise.
8. Re-check the CO
2
level at the boiler maximum output, repeating steps 2 to 7 if necessary.
9. Seal adjustment screw cap with tamper proof paint.
10. If the required CO
2
level cannot be obtained with a CO/CO
2
ratio below 0.004 then contact
Fulton.
4.10
GAS VALVE ADJUSTMENT
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