Riello Burners 40 G20D Manuel D'entretien page 38

ECONOMIZER
This economizer showed in fig. on the right can be
nd
wired to a 2 stage thermostat; in this case it
performs two functions:
1. Delay of 5 - 6 seconds in the intervention of the
nd
2 stage valve against 1
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
2355
st
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
12 GB
st nd
or 2
nd
stage thermostat.
nd
st
S7355
stage on request
stage - compulsorily.
stage - compulsorily.