WarmFlow COMBI 70 - 2 Technical Details; Sequence of Operation Flow Chart

2.0 Technical Details
2.1 Sequence of Operation Flow Chart
YES
NO
YES
DHW
Tank Stat
Satisfied
Flow
Switch
Closed
Timer
Calling For
Heat
Power
On
DHW
Pump Only
Runs
HW
Limit Stat
Tr ipped
Burner
Fires
Burner
Stops
CH
Selected
Burner
Fires
CH Pump
Only Runs
Boiler
Stat
Satisfied
Boiler
Limit Stat
Tr ipped
YES
NO
YES
YES
NO
NO
YES
NO
YES
NO
NO
NO
YES
YES
HW
Selected
YES
NO
Room
Stat
Satisfied
NO
YES
Press
Reset
Button
YES
NO
Boiler
Limit Stat
Tr ipped
Press
Reset
Button
The boiler will have a DHW priority when both domestic hot
water (DHW) and central heating (CH) are selected. So if
the flow switch is closed or the heat store has not been
satisfied the entire output of the boiler is directed to DHW
before the boiler will switch over to CH. When fully cold it
can take up to 20 minutes for the heat store to be satisfied.
After a draw-off of 120L at 24L/min, with an average
temperature rise of 32°C, the thermal store has a recovery
time of approximately 7 mins.
Note: If HW has not been selected no hot water can be
produced even if the heat store is up to temperature.
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