Bosch C 1210 ESC - Group 4

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Functional scheme
57
11 Functional scheme
Fig. 76 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