Bosch Worcester Greenstar CDi Classic System ErP Series - 7.3 Cylinder Heat Function

FAULT FINDING & DIAGNOSIS
6 720 815 724 (2015/11)54
7.3 Cylinder heat function
The cylinder heat function is available only with the
optional diverter valve fitted.
POWER
SWITCH
ON
BLUE
LIGHT
ON
DOMESTIC
HOT
WATER
DEMAND
Cylinder stat
calling
AND
mounted
programmer
ON
Diverter value
in DHW
position
Pump ON.
Spark
ignition
4 seconds
5th
attempt?
Stop spark
Wait
10 seconds
BURNER
LIT?
YES
YES
NO NO
LOCKOUT
Fan to
start
speed.
IGNITION
SEQUENCE
(see details)
GREEN
FLAME
LIGHT
ON
Fan (& gas)
modulation
to achive
set
temperature
(75
o
C)
Gas valve
OFF
Pump run 3
minutes
Fan run 30
seconds
DEMAND
END
Wait
5 seconds
Burner shut down it
primary temperature
94
o
C
(until 84
o
C)
Over temperature shut-down if water
temperature is 8
o
C
above set value.
Gas value OFF.
ECNEUQES NOITINGI
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