Combustion Checks; Burner Start-Up - Riello 521T80 Installation, Use And Maintenance Instructions

COMBUSTION CHECKS

CO
2
It is advisable to not exceed 10% of CO
the risk that small changes of the adjustments due, for instance, at draught variation, may cause com-
bustion with insufficient air and consequently formation of CO.
CO
For safety reason the value of 0.1% (one thousand p.p.m.) must not be exceeded.
IONIZATION CURRENT
The minimum current necessary for the control box operation is 3 µA.
The burner normally supplies a higher current value, so that no check is needed.
However, if a measurement of the ionization current is required, it is necessary to disconnect the
probe lead and insert a d.c. microamperometer.
Lead

BURNER START-UP

Thermostat
Motor
Ignition transf.
st
1 valve
st
1 flame
nd
2 valve
nd
2 flame
Lock-out
2 s
D1799
If during operation the flame shuts off, lock-out occurs within 1 sec.
5865
(gas with calorific value of 8600 kcal/m
2
+
S7511
Normal
40 s 10 s
9
-
Lock-out because no ignition
2 s 40 s
3
), in order to avoid
Probe
3 s max.