38
Within four
minutes of
last hot water
demand
AND
primary
temperature
above 80°C
If heat
demand has
occurred in
last 30
minutes
If heat
demand has
NOT
occurred in
last 30
minutes
Run pump
until primary
drops to
80°C
Run fan
until primary
drops to
80°C
If primary
temperature
still increases
above 90°C
Run pump for
two seconds
OVERRUN FUNCTION
AND
Above
9°C
Commence normal
central heating mode
until temperature
reaches 30°C
5°C
to
9°C
Below
5°C
No demand
and primary
temperature
below 8°C
Internal
“Autofrostat”
demand
Wait in normal
off state for
30 minutes
Run pump for
four minutes
Monitor
central
heating
sensor
Return to
normal off
state
AUTOFROSTAT FUNCTION
Summary of Contents for 26CDi Xtra
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