Riello 908T4 Installation, Use And Maintenance Instructions page 21

Key Fig. 12
AL Alarm device
AUX Auxiliary output
Lead connection
Dbr
Reset button (info button)
(EK1)
/reset
EK2 Remote reset button
FSV Flame signal amplifier
ION Ionisation probe
K... Relay contact
Warning lamp with 3 colours
LED
LP Air pressure switch
LR Load controller
LR-OPEN Load controller OPEN
LR-CLOSE Load controller CLOSED
M Fan motor
NT Power supply unit
P LT Pressure switch valve test
Max. pressure switch
Pmax
Pmin Min. pressure switch
POC Closure test
Pilot valve
PV
QRA... UV flame detector
R Control thermostat or pressure switch
SA Actuator
SA-KL Low flame actuator
SA-NL High flame actuator
SA-R Feedback actuator
SA-Z Actuator CLOSED
Ignition load actuator
SA-ZL
SL Safety loop
STB Safety limit thermostat
SV Safety valve
V1 Fuel valve
V2 Fuel valve
V2a Fuel valve
W Limit pressure switch or thermostat
Ignition transformer
Z
µC µC controller
Input/output 1 signal (ON)
Input/output 2 signal (ON)
Input 1 permitted signal (ON) or 0 (OFF)
Technical description of the burner
Tab. H
19 GB
Times
TSA Safety time
tw Waiting time
t1 Pre-purge time
t3 Pre-ignition time
t3n Post-ignition time (P257 +0.3 seconds)
Ignition time 6s
6÷12s
>12s
t4 Interval: end of safety time load controller
release
t8 Post-purge time
t10 Specified time air pressure switch state mes-
sage (time out)
t11 Opening time of actuator (time out)
t12 Closing time of actuator (time out)
pilot valve ON - fuel valve OFF
pilot valve ON - fuel valve ON
pilot valve OFF - fuel valve ON
Tab. I
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