Keston C25 Installation Manual download pdf (Page 64)

WD485/0/2008

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8. After the high fire adjustment has been made/checked, isolate the electrical supply to the boiler,

verify safe isolation and remove the fan speed jumper again. Restore the electrical supply to the

boiler and then turn the boiler on and off using the fascia control knob. Low fire position is

confirmed when the second green LED is illuminated, isolate the electrical supply, verify safe

isolation and re-fit the fan speed jumper. Restore the electrical supply and turn the boiler on via the

fascia control knob. At this point the boiler will fire up with just the first LED on. The low fire flue gas

reading should be 8% to 8.5% CO2 for natural gas or 8.9% to 9.3% CO2 for LPG. DO NOT ADJUST

ANY ADJUSTMENT SCREW.

9. After the high then low fire adjustment has been made, then the boiler must be returned to

modulation operation. Isolate the electrical supply, verify safe isolation and remove the fan speed

jumper. Restore the electrical supply to the boiler and then turn the boiler on and off using the

fascia control knob until there are no lower LEDs illuminated. Isolate the electrical supply, verify

safe isolation and refit the jumper to the board, refit boiler fascia and case.

Restore the electrical supply to the boiler and hand over to the user.

If following the above procedure, combustion levels described above at both high and low rate

could not be obtained, please turn off the appliance and isolate the gas to the appliance.

Telephone KESTON BOILERS technical support (phone no. 0208 462 0262)

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Keston C25 Installation Manual Page 64