Final Checks; Safety Test - With Gas Ball Valve Closed; Maintenance; Safety Components - Riello RS 34 MZ Instrucciones De Instalación, Uso Y Mantenimiento

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.
IF THE ELECTRICAL SUPPLY OF THE GAS VALVES OCCURS AT UNEX-
PECTED TIMES, DO NOT OPEN MANUAL GAS BALL VALVE, SWITCH OFF
POWER LINE; CHECK THE WIRES; CORRECT THE ERRORS AND REPEAT
THE COMPLETE TEST.

SAFETY COMPONENTS

The safety components must be replaced at the end of their life cycle indicated in the following
Table. The specified life cycles do not refer to the warranty terms indicated in the delivery or
payment conditions.
Safety component
Flame control
Flame sensor
Gas valves (solenoid)
Pressure switches
Pressure adjuster
Servomotor (electronic cam) (if present)
Oil valve (solenoid)
(if present)
Oil regulator (if present)
Oil pipes/ couplings (metallic) (if present)
Flexible hoses (if present)
Fan impeller
Life cycle
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
15 years
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
10 years
5 years or 30,000 pressurised cycles
10 years or 500,000 start-ups
15

FINAL CHECKS

(with the burner working):
• disconnect a wire of the minimum gas pres-
sure switch;
• switch on the thermostat/pressure switch TL;
• switch on the thermostat/pressure switch TS;
the burner must stop.
• disconnect the air adduction tube of the pres-
sure switch;
• disconnect the wire of the ionisation probe;
the burner must stop in lockout.
Make sure that the mechanical locking systems
on the various adjustment devices are fully tight-
ened.

MAINTENANCE

The burner requires periodic maintenance
carried out by a qualified and authorised
technician in conformity with legislation and
local standards.
Periodic maintenance is essential for the
reliability of the burner, avoiding the
excessive consumption of fuel and consequent
pollution.
Before carrying out any cleaning or
control, always switch off the electrical
supply to the burner, using the main switch of
the system.
Combustion
The optimum calibration of the burner requires
an analysis of the flue gases. Significant differ-
ences with respect to the previous measure-
ments indicate the points where more care
should be exercised during maintenance.
Gas leaks
Make sure that there are no gas leaks on the
pipework between the gas meter and the burner.
Gas filter
Substitute the gas filter when dirty (see train
instructions).
Combustion head
Open the burner and make sure that all compo-
nents of the combustion head are in good condi-
tion, not deformed by the high temperatures,
free of impurities from the surroundings and cor-
rectly positioned. If in doubt, disassemble the
elbow.
Servomotor
Release the cam 4)(A) p.11, rotating by 90° the
notch 2)(A) p.11, and manually check that it
rotates smoothly backwards and forwards. Con-
strain the cam again 4).
Burner
Check for excess wear or loose screws in the
mechanisms controlling the air damper and the
gas butterfly valve. In addition, the screws that
fix the cables in the terminal board must be
blocked, along with the burner sockets.
Clean the outside of the burner, taking special
care with the transmission joints and cam 4)(A)
p.11.
Combustion
Adjust the burner if the combustion values found
at the beginning of the operation do not comply
with the regulations in force, or at any rate, do
not correspond to good combustion.
Use the appropriate card to record the new
combustion values; they will be useful for subse-
quent controls.