Bosch C1210ESC - 12 Functional Scheme

50 | Functional scheme
C 1210 ES/ESC6 720 644 887 (2013/02)
12 Functional scheme
Fig. 75 Functional scheme
Fan speed
OK?
waiting
time of 10s
passed?
water tap
open?
Water flow
0.5 gpm
(> 1.9 l/min)
(see WF calc.)
>
NO
NO
NO
NO
YES
YES
YES
YES
NO NO NO
NO
YES
YES
Start sparking
IDLE
Open the gas
valve
1st
Safety time
of 5s passed?
Ionization
detected?
6720608158-65.2V
NO
NO
NO
NO
YES
YES
YES
See error
code table
Post purge of
fan for 7 sec.
Stay blocked
till RESET
close second
gas valve
Post purge of
fan for 7 sec.
water tap
closed
<0.5 gpm?
safety
devices
OK?
close one gas
valve
waiting
time of
1s passed?
flame off?
Hot water
delivered at
selected temp.
Appliance
ready to start?
Fan speed = correct
Ionization = off
Temp. limiter = closed
Temp. sensors = ok
Over heat protection = ok
See error code table
INPUTS:
- FANSPEED
- WATER TEMP.
- WATERFLOW
OUTPUTS:
- FANSPEED
- WATERFLOW
YES
YES
YES YES
2nd
Safety time of
5s passed?
3rd
Safety time
of 5s passed?
Water flow
Calculus
WF =
Burner ON
Burner ON
Minimum Power
(Set point - Inlet)
NO
YES
YES
Burner shutdown at:
Set point +9°F (5°C)
WF < 0.45 gpm ± 0.05 gpm
(WF < 1.7 l/min ± 0.2 l/min)
Burner shutdown at:
Set point +14°F (8°C)
WF < 0.45 gpm ± 0.05 gpm
(WF < 1.7 l/min ± 0.2 l/min)
0.5 GPM < WF < 1.6 GPM
(2 l/min < WF <6 l/min)
WF > 1.6 GPM
(WF > 6 l/min)
NO
Water flow procedure