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8.8
Economizer
This economizer can be wired to 2
ternal probe.
The economizer, connected to the 2
forms two functions:
1
Delay of 5 - 6 seconds in the intervention of the 2
st
valve against 1
stage valve.
2
In relation of the position of the plug B (Fig. 25), it deter-
mines the type of required operation:
B
II - I
I
II
II - I
I
II
II - I
I
II
NOTE
In this case the setting screw A (Fig. 25) is not necessary.
8.9
Burner start-up cycle
Normal
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
20032184
Start-up, calibration and operation of the burner
nd
stage thermostat or to an ex-
nd
stage thermostat, per-
Position I - II
st
Burner operation in 1
nd
stage on request of the 2
thermostat.
Position II
Burner operation only in 2
stage - compulsorily.
Position I
Burner operation only in 1
stage - compulsorily.
~ 12s
nd
stage
nd
or 2
stage
nd
Should the economizer be connected to an external probe,
the operation at 1
temperature.
When the external temperature is higher than the fixed value the
st
economizer permits the burner operation only at 1
contrary when the external temperature decreases in relation
with the fixed value, the economizer permits the burner operation
nd
only at 2
stage.
Fig. 24
The external temperature causing the economizer intervention
might be chosen between –5 °C and +10 °C, turning the setting
screw A (Fig. 25) using the screw-driver.
For this type of operation the plug B (Fig. 25) has to placed in the
position I - II.
When the plug B is in the position II or I, the burner operates as
previously indicated.
Lock-out due to failure to light
22
GB
st
nd
or 2
stage will be related to the external
~ 12s
~ 5s
S7341
Fig. 25
st
stage; on the
D5229
Fig. 26
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