Riello DB 4 SM BLU Installation, Use And Maintenance Instructions Download

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Maintenance

6.1

Problems and remedies

If the burner does not work properly, first you must:

check that the electric connections have been correctly performed;

ensure that the fuel is delivered correctly;

check that all the adjustment parameters (e.g. boiler water temperature or boiler steam pressure) are correctly set.

In the event of a burner lockout, more than two consecutive burner reset operations could cause damage to the

installation. On the third lockout, contact the Aftersales Service.

If further lockouts or burner faults occur, interventions must only be made by qualified, authorised personnel (as

indicated in this manual, and in compliance with the laws and regulations currently in force).

Fault

Possible cause

Recommended remedy

The burner does not start

• No electrical power supply . . . . . . . . . . . . . . . . . . . .Close all switches - Check connec-

tions

• A limiter or safety control device is open. . . . . . . . . .Adjust or replace
• Flame control lock-out. . . . . . . . . . . . . . . . . . . . . . . .Reset control box
• Control box fuses blown . . . . . . . . . . . . . . . . . . . . . .Replace
• Erroneous electrical connections . . . . . . . . . . . . . . .Check connections
• Defective flame control . . . . . . . . . . . . . . . . . . . . . . .Replace
• No gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Open the manual valves between

meter and train

• Mains gas pressure insufficient. . . . . . . . . . . . . . . . .Contact your GAS COMPANY
• Minimum gas pressure switch fails to close . . . . . . .Adjust or replace
• Air pressure switch in operating position . . . . . . . . .Adjust or replace

The burner does not start and a
function lock out occurs

• Flame simulation. . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace control box

The burner ignites but then
blocks

Air pressure switch inoperative due to insufficient air pressure:
• Air pressure switch adjusted badly . . . . . . . . . . . . . .Adjust or replace
• Pressure switch pressure point pipe blocked . . . . . .Clean

is blocked

• Head wrong adjusted . . . . . . . . . . . . . . . . . . . . . . . .Adjust

The burner starts and then locks
out

• Fault in flame detection circuit . . . . . . . . . . . . . . . . .Replace flame control

After pre-purge and safety time,
the burner goes to lock-out and
the flame does not appear

• The solenoid VR allows little gas through . . . . . . . . .Increase
• Solenoid valves VR or VS fail to open  . . . . . . . . . . .Renew the coil or rectifier panel
• Gas pressure too low  . . . . . . . . . . . . . . . . . . . . . . . .Increase on the regulator
• Defective ignition transformer   . . . . . . . . . . . . . . . . .Replace
• Erroneous valve or transformer electrical   . . . . . . . .Repeat connections

connections

• Defective control box . . . . . . . . . . . . . . . . . . . . . . . .Replace
• A cock down-line of the gas train is closed . . . . . . . .Open
• Air in pipework . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bleed air

The burner goes to lock-out right
after flame appearance

• The solenoid VR allows little gas through . . . . . . . . .Increase
• Max. gas pressure switch operates. . . . . . . . . . . . . .Adjust or replace
• Defective control box . . . . . . . . . . . . . . . . . . . . . . . .Replace

WARNING

DANGER