Riello DB 4 LSM C13, Installation, Use And Maintenance Instructions

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24
CHAPTER
7
Maintenance
Safety test - with gas ball valve closed
It is fundamental to ensure the correct execution of the electrical
connections between the gas solenoid valves and the burner to
perform safely the commissioning.
For this purpose, after checking that the connections have been
carried out in accordance with the burner's electrical diagrams,
an ignition cycle with closed gas ball valve -dry test- must be
performed.
1
The manual ball gas valve must be closed
2 The electrical contacts of the burner limit switch need to be
closed
3 Ensures closed the contact of the low gas pressure switch
4 Make a trial for burner ignition
The start-up cycle must be as follows:
–
Starting the fan for pre-ventilation
– Performing the gas valve seal control, if provided
– Completion of pre-ventilation
– Arrival of the ignition point
– Power supply of the ignition transformer
– Electrical Supply of solenoid gas valves
Since the manual gas ball valve is closed, the burner will not
light up and its control box will go to a safety lockout condition.
The actual electrical supply of the solenoid gas valves can be
verified by inserting a tester. Some valves are equipped with
light signals (or close/open position indicator) that turn on at the
same time as their power supply.
Safety components
The safety components must be replaced at the end of their life
cycle indicated in Tab. B. The specified life cycles do not refer
to the warranty terms indicated in the delivery or payment con-
ditions.
IF THE ELECTRICAL SUPPLY OF THE GAS VALVES
OCCURS AT UNEXPECTED TIMES, DO NOT OPEN
MANUAL GAS BALL VALVE, SWITCH OFF POWER
LINE; CHECK THE WIRES; CORRECT THE ERRORS
AND REPEAT THE COMPLETE TEST.
WARNING
Safety component Life cycle
Flame control
10 years or 250,000
operation cycles
Flame sensor
10 years or 250,000
operation cycles
Gas valves (solenoid)
10 years or 250,000
operation cycles
Pressure switches
10 years or 250,000
operation cycles
Pressure adjuster 15 years
Servomotor (electronic
cam) (if present) 10 years or 250,000
operation cycles
Oil valve (solenoid)(if
present) 10 years or 250,000
operation cycles
Oil regulator (if present)
10 years or 250,000
operation cycles
Oil pipes/ couplings
(metallic) (if present)
10 years
Flexible hoses (if present)
5 years or 30,000 pressurised
cycles
Fan impeller 10 years or 500,000 start-ups