Minimum Gas Pressure Switch; Pvp Pressure Switch Kit; Steady-State Operation; Ignition Failure - Riello RS BLU Series Installation, Use And Maintenance Instructions

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.
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.
20085953
Start-up, calibration and operation of the burner
 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.
In the event of a burner lockout, more than two
consecutive burner reset operations could cause
damage to the installation. On the third lockout,
WARNING contact the Aftersales Service.
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-
DANGER
ly in force).
Checking
gas pressure
20082133
32 GB
D3855
Fig. 37
Checking
air pressure
Fig. 38