RIELLO RDB SERIES OIL BURNERS
FAULT FINDING
LOGIC FOR
DIGITAL CONTROL BOX TYPE
MO535‐MPF
LED CODE ‐ LOCKOUT TYPES
(control box in lock out)
CONTROL BOX IS SUPPLIED
WITH HEAT DEMAND
A
MOTOR
STARTS AFTER INITIALIZATION CHECK TIME 3.5s?
Y
N
N
CHECK BOILER & SYSTEM CONTROLS
Y
GO TO
BOX
A
RED 0.2s ON / RED 0.2s OFF
Lock‐out for max n° of recycles
FAN MOTOR OR OIL PUMP
SEIZED?
N
RED 2.5s ON / ORANGE 0.5s ON
RED 2.5s ON/ GREEN 0.5s ON
Lock‐out for oil‐valve failure
ORANGE 0.5s ON / GREEN 0.5s ON
Control box internal error
N
C
D
ARE ELECTRODES N
OK & SET CORRECTLY?
N
Y
ORANGE steady ON
When anomaly appears during pre‐purge, burner remains in pre‐purge.
When anomaly appears after ignition, burner remains in operation.
When anomaly disappears burner restarts.
Push button is activated for more than 60s.
When anomaly appears burner doesn't stop.
AIR SET CORRECTLY?
Y
COMBUSTION HEAD SET CORRECTLY?
N
N
N
COIL
LEAD OK?
ADJUST COMBUSTION AIR SETTING
RESET COMBUSTION HEAD
Y
CLEAN OR REPLACE FILTERS
FLAME GOES OUT THEN
RE‐LIGHTS?
REPLACE NOZZLE
E
COIL
RESISTANCE 90 to 110Ω? CHECK OIL PIPE FROM PUMP TO NOZZLE HOLDER
Y
CLEAR BLOCKAGE
Y
BOILER OR FLUE BLOCKED?
N
REPLACE
OIL PUMP
IGNITION
LEADS OK?
N
CLEAN OR REPLACE PUMP & FUEL LINE FILTERS
REPLACE
COIL N
IF BALANCED FLUE; REMOVE SNORKEL AND TEST ‐ NOW OK?
Y
Y
COIL
RESISTANCE 90 to 110 Ω? Y
REPLACE IGNITION
LEADS
N
AFTER 15s
25‐30Vdc TO COIL? (COIL CONNECTED)
Y
Y
PHOTOCELL RESISTANCE >10 MΩ IN DARK AND <10 kΩ INLIGHT?
REPLACE
COIL REPLACE CONTROL BOX
REPLACE
OIL PUMP
BALANCED FLUE CAN RECIRCULATE GASES CAUSING RECYCLING
N
F
REPLACE
COIL LEAD
Y
N
REPLACE
PUMP
COUPLING
REPLACE PHOTOCELL
Y
N
Y
N
REPLACE PHOTOCELL
CHECK FLUE POSITION & SEALS
POST PURGE FEATURE
POST PURGE FEATURE
LIGHT DIAGNOSIS FEATURE (FLAME STRENGTH INDICATOR)
LIGHT DIAGNOSTICS FEATURE (PHOTOCELL STRENGTH / LIGHT LUX LEVEL INDICATOR )
Sequence for post‐purge programming
Sequence for enable / disable
This can only be carried out during operation (burner running)
This can only be carried out during operation (burner running)
) Press push‐button for 10 to 15 sec
) Press and hold the reset button for 15‐20 sec.
LED ‐ GREEN flash 1 time
) Release push‐button
LED ‐ GREEN OFF
) Press push‐button 1 to 6 times for selection (see TIMINGS)
LED ‐ GREEN ON and OFF for each press and release
LED ‐ RED blink 2 times after 5 sec.
LED ‐ GREEN blink 1 time after 10 sec.
LED ‐ GREEN blink 2 times
) Release the reset button
LED ‐ GREEN OFF
) Press the reset button 1 time for enable or 2 times for disable
LED ‐ GREEN ON and OFF for each press and release
After 10 sec LED ‐ GREEN blinking for the programmed
times (0.5s ON / 0.5s OFF)
LIGHT LEVEL
(see instruction manual)
(see instruction manual)
(see instruction manual)
(see instruction manual)
Only motor runs.
Lock out after 25s.
NOZZLE
NEW?
Y
N
REPLACE OR RESET ELECTRODES
DRIVE COUPLING Y
BROKEN?
C
Y
N
CONTAMINATED
FUEL FILTERS?
Y
N
REPLACE MOTOR CAPACITOR
F
GREEN 0.5s ON / RED 0.5s ON
Anomaly for reset
push‐buttonfailure
CHECK OIL SUPPLY TO OIL PUMP
NOZZLE ATOMIZING THE FUEL?
Y
N
N
Fit pre‐heater link
GREEN 0.2s ON / RED 0.2s ON
N
REMOVE EXTRANEOUS LIGHT
REPLACE FAN MOTOR AND CHECK CONTROL BOX
E
COIL RELEASES WORKING PRESSURE?
N
D APPROX
35Ω ACROSS BLUE & BLACK MOTOR WIRE?
Pre‐heating time
(gas oil units only)
Control box internal error
Y
Y
B
GREEN 0.5s ON / GREEN 2.5s OFF
ORANGE 0.2s ON / GREEN 0.2s ON
BURNER
FIRES WHEN PHOTOCELL IS COVERED?
PHOTOCELL RESISTANCE >10 MΩ IN DARK AND <10 kΩ IN LIGHT?
230V TO MOTOR ACROSS BLUE & BLACK WIRE?
IGNITION
SPARK
PRESENT?
Y
N
N
(control box in standby)
Anomaly for presence of abnormal frequency supply B
Y
REPLACE
FAN MOTOR LED CODES ‐ ANOMALY TYPE
Anomaly for presence of extraneous light
WASHING PRESSURE 1 ‐ 2 BAR?
N
Y
MOTOR GIVES 5OVac ACROSS WHITE & BLACK WIRE?
Y
Lock‐out for fan motor failure
BURNER LOCKS OUT AFTER 25s?
Y
REPLACE
SEIZED COMPONENT
RED 0.5s ON / RED 0.5s OFF
Lock‐out for false flame signal
N
Y
N
RED steady ON
Lock‐out for no flame after safety time
FAN RUNS FOR LESS THAN 12s?
Y
After 10 sec LED ‐ GREEN blinking for the programmed
times (0.5s ON / 0.5s OFF)
NOTE: If heat demand switches off during the post purge
programming sequence the control box will revert to the
previous setting. If the heat demand switches off after the
programming sequence but during the final light flashing
confirmation stage of the programming, the new setting
will be saved.
TIMINGS
1 = 10 sec. (default)
2 = 20 sec.
3 = 30 sec.
4 = 60 sec.
5 = 120 sec.
6 = 0 sec. (disable)
‐ 1 flash
‐ 2 flash
‐ 3 flash
‐ 4 flash
‐ 5 flash
‐ 6 flash
Minimum
Good
Very good
‐ 1 to 2 flash
‐ 3 to 4 flash
‐ 5 to steady on