Riello RL 22 BLU Installation, Use And Maintenance Instructions page 33

(A)
STEADY STATE OPERATION
System equipped with one control device TR
Once the starting cycle has come to an end, the
command of the 2nd stage solenoid valve
passes on to the control device TR that controls
boiler temperature or pressure.
• When the temperature or the pressure
• When the temperature or pressure decreases
• The burner stops when the demand for heat is
System not equipped with control device TR
(jumper wire installed)
The burner is fired as described in the case
above. If the temperature or pressure increase
until control device TL opens, the burner shuts
down (Section A-A in the diagram).
When the solenoid valve 11) de-energizes, the
piston 12) closes the passage to the 2nd stage
nozzle and the fuel contained in the cylinder 15),
piston B, is discharged into the return piping 7).
FIRING FAILURE
If the burner does not fire, it goes into lockout
within 5 s of the opening of the 1st nozzle valve
and 30 s after the closing of control device TL.
The control box red pilot light will light up.
UNDESIRED SHUTDOWN DURING OPERA-
D1756
TION
If the flame goes out during operation, the burner
shuts down automatically within 1 second and
automatically attempts to start again by repeat-
ing the starting cycle.
FINAL CHECKS
• Obscure the UV Sensor and switch on the
• Obscure the UV Sensor while the burner is in
• Switch off control device TL followed by con-
14
increases until the control device TR opens,
solenoid valve 11) opens, and the burner
passes from the 2nd to the 1st stage of opera-
tion.
until the control device TR closes, solenoid
valve 11) closes, and the burner passes from
the 1st to the 2nd stage of operation,
and so on.
less than the amount of heat delivered by the
burner in the 1st stage. In this case, the
remote control device TL opens, solenoid
valve 8) closes, the flame immediately goes
out. The fan's air damper valve closes com-
pletely.
control devices: the burner should start and
then lock-out about 10 s after opening of the
1st stage operation valve.
operation: it should follow the extinguishing of
the flame within 1 s, the repetition of the start-
ing cycle and the burner's lock-out.
trol device TS while the burner is operating:
the burner should stop.