5144
11
CURRENT TO THE UV PHOTOCELL
Min. value for a good work: 15 µA.
If the value is lower, it can depends on:
- worked out photocell.
- low current (lower than 187V)
- bad regulation of the burner.
In order to measure the current, use a microammeter of 100 µA c.c., connected to the photocell, as in
the scheme, with a capacitor of 100 µF - 10V c.c. at the same level of the instrument.
BURNER STARTING UP PROGRAMME
If during the work the flame burns off, there is a lock out within 1 second.
+
-
S7551
+
-
+
-
Cell
UV
Normal
Lock-out because no ignition
Thermostat
Motor
Ignition transf.
1
st
valve
1
st
flame
2
nd
valve
2
nd
flame
Lock-out
S7593
37s min.
4s
10s
37s min.
4s
2s max.