Buderus Logano GA124 Installation And Maintenance Instructions Manual page 56

11 Boiler inspection and maintenance
Ignition sparks visible between
ignition electrode and flame
guide.
Open main gas valve.
Ignition burner ignites.
56 Installation and maintenance instructions Logano GA124 special gas-fired boiler • Issue 04/2005
No
Check S 8600 H automatic igniter.
• Check 24 V voltage at terminals 3 and 4 (power supply to S 8600 H
automatic igniter) of the terminal on boiler block.
If not:
• Check wiring between terminal on boiler block and S 8600 H automatic
igniter.
• Check ignition wiring, ceramic insulator of ignition electrode and ignition
gap, adjust if necessary.
• Check the ignition cable contact for signs of scorching or kinking.
• If OK: replace S 8600 H.
Check flame guard.
•
24 V voltage at terminals 2 and 3 of the terminal on boiler block?
If not: check wiring between flame guard and terminal on boiler block.
If OK: replace flame guard.
Check air pressure switch.
• Check 24 V voltage at terminals 1 and 2 of the terminal on boiler block.
If not:
• check wiring between air pressure switch and terminal on boiler block.
• Check correct adjustment of baffle in fan enclosure (see page 30).
• Check venting and combustion air line for correct cross-section.
• Check combustion air hose between fan housing and burner for correct
cross-section.
• Check heat exchanger for blockages.
• If the length of the venting pipe or the combustion air pipe exceeds the
maximum approved length as specified in
page 32 ?
If OK: replace air pressure switch.
No
Check gas fitting and S 8600 H automatic igniter.
• Check that all manually operated baffles are open; check that gas
connections and pressures are correct and that ignition gas nozzles are not
blocked.
• Check electrical connections between automatic ignition and ignition timer
on the gas fitting.
• Use MV-MV/PV terminals to check 24 V alternating current at the
automatic ignition. If the voltage is correct replace gas fitting, otherwise
replace automatic ignition.
Tab. 10 to Tab. 11 on
We reserve the right to make any changes due to technical modifications.