Bosch 14/19CBI - Manual (Page 34)

34
18. Operational Flow Diagram
M
ains
230V
supply
BOILER
HEA
T
DEMAND
Pump
continues
fo
r
4
minutes
DEMAND
OFF
Boiler demand
fr
om sy
stem
junction bo
x
AND
User contr
ol
knob ON
Run f
a
n
20
seconds
o
r wa
it
fo
r
the end of
the f
a
n
o
verrun Boiler
demand light on
Pump supply
on
Ignition
sequence
Boiler cy
cles
to
satisfy
temper
atur
e
set b
y
f
acia
contr
ol
knob
Temper
atur
e
Sensor disconnected
Ignition sequence inhibited (f
an and pump ma
y run f
or
short period)
Boiler
o
verheat
Ov
erheat
thermost
at
trip.
Lock
out
light
(const
ant)
Pr
otection Sy
stems
re-attempt
ignition (MAX 4
times) lock
out
light
(flashing)
Fan
continues
fo
r
1
minute
FA
IL
PASS PASS
FA
IL
Run pump
continuously