Operating Programme; Normal Operation - Riello 901T Installation, Use And Maintenance Instructions

6.9

Operating programme

6.9.1

Normal operation

P
TL
tw t1
M
M
I
V
SO
Flame loss during the operation
and lockout due to ignition failure
SO
LED
Operating times
ta tf
20 1
Time expressed in seconds
Time for checking motor turns:
ta if the number of turns is lower than 900 rpm, after ta will
be carried out a lockout.
tf Response time after the flame disappearance.
Flame or flame simulation detected during pre-purging:
tl
immediate lockout.
Stabilisation time:
tm
the modulation occurs after this time.
Safety time:
ts if at the end of the time ts a flame is not present, tpp is
carried out. After 3 times follows a lockout.
tm
t2 t3
ts
.
Lockout
tf
D10632
tl tm ts
40 10 5
Operation
Key
I – Ignition transformer
LED–Reset button LED indicating operating status
M – Fan motor
SO– Ionisation probe
TL– Limit thermostat
V – Gas valve
Red (LED signalling)
No signal needs to be received
tw t1
- 40
tw Stabilisation time motor turns.
Pre-purging time:
t1
by the signal of heat request to the end of the ignition.
Transformer pre-ignition time:
t2
ignition before the valve closing.
Transformer ignition time:
t3
the transformer remains on during the safety time.
Post-purging time:
Additional purging when the heat request is completed,
t8
or in case of flame failure during the operation or in
case of ignition failure.
17 GB
t2 t3 t8
3 5 10
Fig. 17
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