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Beeston Heating ACER 60 Design Manual page 15

Wall-hung condensing premix gas fired boiler 60-180 kw
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Bees ton ACER wall-hung c ondens ing boiler 60-180kW
D ESIGN MANUAL
7.6.2 Cascade working principle
The cascade will work switching on and off
the master boiler and the slaves in a
sequence that will normally vary every 24
hours as follows, On heating or hot water
demand boiler X will fire, when the desired
flow temperature is reached after a preset
waiting time, then the master will start to
control, if the desired flow temperature has
not been reached, then another boiler will fire
7.6.3
Cascade schematic diagram
Boiler
Boiler
slave 8
slave 7
DHWS
OS Outside sensor.
RS Room stat with timer.
FS Flow sensor.
DHWS Domestic hot water sensor
7.6.4 Cascade operation sequence for 8 boilers
Day
Switching on sequence
Day 1
Master – Slave 1 – Slave 2 – Slave 3 -
Slave 4 – Slave 5 – Slave 6 – Slave 7
Day 2
Slave 7 – Master – Slave 1 – Slave 2 –
Slave 3 – Slave 4 – Slave 5 – Slave 6
Day 3
Slave 6 – Slave 7 – Master – Slave 1 –
Slave 2 – Slave 3 – Slave 4 – Slave 5
Etc.
Etc.
RS
Boiler
Boiler
slave 6
slave 5
FS
P a g e 1 5
and so on until all boilers will fire at the
minimum output. If the temperature still has
not been reached all boilers will modulate up
until reaching the maximum output. And when
the desired temperature finally is going to be
reached the boilers will modulate down until
reaching equilibrium, eventually switching off
when all are at minimum load.
Boiler
Boiler
slave 4
slave 3
Switching off sequence
Slave 7 – Slave 6– Slave 5 – Slave 4 -
Slave 3 – Slave 2 – Slave 1 – Master
Slave 6– Slave 5 – Slave 4 – Slave 3 –
Slave 2 – Master – Slave 7
Slave 5– Slave 4 – Slave 3 – Slave 2 –
Slave 1 – Master – Slave 7 – Slave 6
Etc.
OS
Boiler
Boiler 1
slave 2
master

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