Riello 40 G20D Instrucciones De Instalación, Uso Y Mantenimiento página 28

4.6 ELECTRONIC START DELAYING DEVICE
This electronic start delaying device showed in fig. on the right
nd
can be wired to a 2 stage thermostat; in this case it performs
two functions:
1. Delay of 5 - 6 seconds in the intervention of the 2
st
against 1 stage valve.
2. In relation of the position of the plug A, it determines the type of
required operation:
A
II - I I
II
II - I I
II
II - I I
II
3397
nd
stage valve
Position I - II = Burner operation in 1
of the 2
Position II = Burner operation only in 2
Position I = Burner operation only in 1
13 GB
st nd
or 2 stage on request
nd
stage thermostat.
nd
stage - compulsorily.
st
stage - compulsorily.
S7355