Installation & Servicing Instructions - Grant UK
Installation & Servicing Instructions - Grant UK
Installation & Servicing Instructions - Grant UK
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12.2 Burner Fault Finding - Riello RDB burners<br />
Nozzle<br />
atomising<br />
fuel<br />
NO<br />
YES YES<br />
Combustion<br />
air set<br />
Combustion<br />
head set<br />
YES<br />
Solenoid<br />
valve<br />
operating<br />
NO<br />
Replace<br />
nozzle<br />
YES<br />
YES NO NO<br />
Flame off<br />
and<br />
relights<br />
Check oil<br />
pressure<br />
regulator<br />
Contaminated<br />
fuel or<br />
filter<br />
Boiler or<br />
flue<br />
blocked<br />
Replace coil<br />
and/or<br />
stem valve<br />
Replace<br />
control<br />
box<br />
Fault Finding<br />
If balanced flue,<br />
remove air tube<br />
and retest<br />
OK<br />
Reseal<br />
balanced flue<br />
or reposition flue<br />
Lockout<br />
after 12 sec<br />
purge<br />
YES<br />
Ignition<br />
spark<br />
proved<br />
Pump<br />
produces<br />
pressure<br />
YES YES<br />
NO<br />
NO<br />
NO<br />
Repair<br />
or replace<br />
motor/pump<br />
Check and<br />
set the<br />
electrodes<br />
NO<br />
Washing<br />
pressure<br />
1 to 2 bar<br />
NO<br />
YES<br />
Replace<br />
the<br />
control box<br />
Drive<br />
coupling<br />
broken<br />
NO<br />
Repair or<br />
replace<br />
oil pump<br />
Motor gives<br />
50 Volts *<br />
to white wire<br />
Coil of<br />
solenoid<br />
sound **<br />
YES YES YES<br />
Photocell<br />
sound ***<br />
NO NO NO<br />
Replace<br />
burner<br />
motor<br />
Replace<br />
solenoid<br />
coil<br />
Replace<br />
photocell<br />
Burner<br />
motor runs<br />
Lockout<br />
within<br />
1 second<br />
YES NO<br />
NO YES<br />
Check L & N<br />
to control<br />
box<br />
YES<br />
NO NO<br />
Motor/pump<br />
seized<br />
or tight<br />
YES<br />
Check<br />
boiler<br />
controls<br />
Replace<br />
motor<br />
capacitor<br />
Notes<br />
*<br />
**<br />
***<br />
Motor white wire returns 50 - 53 V AC<br />
to control box.<br />
Test solenoid coil for continuity or 100<br />
ohms.<br />
Test photocell by disconnecting it in<br />
control box. If burner fires and then<br />
goes to lockout, photocell should be<br />
replaced.<br />
It is best to replace the photocell if it is<br />
suspect.<br />
Burners on balanced flue systems can<br />
recirculate flue products causing<br />
burner recycling. If this happens,<br />
check flue position and sealing.<br />
38
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