Riello RS 120/EV BLU, Installation, Use And Maintenance Instructions

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20085953
32 GB
Start-up, calibration and operation of the burner
6.5.3 Minimum gas pressure switch
Adjust the minimum gas pressure switch (Fig. 37) after having
performed all other burner adjustments with the pressure switch
set to the start of the scale.
With the burner operating at maximum output, increase adjust-
ment pressure by slowly turning the relative knob clockwise until
the burner locks out.
Then turn the knob anticlockwise by 2 mbar and repeat the burn-
er start-up to ensure it is regular.
If the burner locks out again, turn the knob anticlockwise again by
1 mbar.
6.5.4 PVP pressure switch kit
Adjust the pressure switch for the valve leak detection control de-
vice (PVP Kit), if present, according to the instructions supplied
with the Kit itself.
6.6 Steady-state operation
Burner without modulating operation kit
Once the start-up cycle is completed, the servomotor command
moves on to the thermostat/pressure switch TR that controls the
pressure or the temperature in the boiler.

If the temperature or the pressure is low (so the thermostat/
pressure switch TR is closed), the burner progressively
increases the output as far as the MAX value (point “P9”).

If the temperature or the pressure increases as far as the
opening of the thermostat/pressure switch TR, the burner
progressively reduces the output as far as the MIN value
(point “P1”). And so on.

The burner switches off when the request for heat is lower
than the heat supplied by the burner at MIN output.

The thermostat/pressure switch TL opens and the control
box carries out the switching off phase.

The damper closes completely to reduce thermal disper-
sions to a minimum.
Burner with modulating operation kit
See the manual supplied with the regulator.
6.7 Ignition failure
If the burner does not switch on, there is a lockout within 3s of the
electrical supply reaching the gas valve.
It may be that the gas does not arrive at the combustion head
within the safety time of 3 s.
In this case, increase gas delivery upon ignition.
The arrival of the gas at the pipe coupling is shown on the pres-
sure gauge of Fig. 38.
6.8 Checking the air and gas pressure on the combustion head
To check the air and gas pressure on the combustion head it is
necessary to connect the pressure gauges as shown in Fig. 38.
Fig. 37
D3855
WARNING
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.
DANGER
If further lockouts or burner faults occur, interven-
tions must only be made by qualified, authorised
personnel (as indicated in this manual, and in
compliance with the laws and regulations current-
ly in force).
20082133
Checking
gas pressure
Checking
air pressure
Fig. 38