Combustion Check; Burner Start-Up Cycle; Start-Up Cycle Diagnostics - Riello GS20 Installation, Use And Maintenance Instructions

4.3 COMBUSTION CHECK

CO
2
It is advisable to not exceed 10% of CO
adjustments due, for instance, at draught variation, may cause combustion with insufficient air and consequently
formation of CO.
CO - Not exceeding 100 mg/kWh (93 ppm).
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 you want to meas-
ure the ionization current, you must open the connector fitted to the red wire and insert a microammeter.

4.4 BURNER START-UP CYCLE

Normal
Thermostat
Motor
Ignition transformer
Valves
Flame
Lock-out
max. 2s
When flame-failure occurs during working, shut down takes place within one second.

4.5 START-UP CYCLE DIAGNOSTICS

During start-up, indication is according to the followin table:
Sequences
Pre-purging
Ignition phase
Operation, flame ok
Operating with weak flame signal.
Electrical supply lower than
Lock-out
Extraneous light
Index: Off
2754
(natural gas) , in order to avoid the risk that small changes of the
2
Terminal board
of control-box
10
40s
COLOUR CODE TABLE
~
170V
Yellow
Connector
Probe
D5006
Lock-out, due to ignition failure
max. 2s
Green Red
7 GB
40s 3s
Colour code
D4172