Worcester 24ijunior Installation And Servicing Instructions page 34

END DHW
DEMAND
Fan low speed
END CH
DEMAND
No demand
and primary
temperature
below 8°C
Internal
Run pump
"Autofrostat"
demand
OVERRUN FUNCTION
There is a delay of 6 seconds,
pump pulses for 2 seconds,
60 second wait,
2 second pump pulse,
60 second wait,
pump pulses for 2 seconds.
Fan low speed if
primary temp
35 seconds
above 85°C until
below 80°C.
Pump runs
for
3 minutes
AUTOFROSTAT FUNCTION
Monitor
central
heating
sensor
34
5°C
Below
Above
to
5°C
9°C
9°C
Commence normal
central heating mode
until temperature
reaches 20°C
Return to
normal off
state