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12.1.1 Cascade
Menu / Heating system / Cascade / Cascade (NA.)
The boiler that is wanted to be a part of the Cascade net, need to be added a function, to get the cascade
control up running.
The 3 different state the boiler can get is listed below.
NA:
Cascade is not active
MSTR:
The boiler work as Master
SLV:
The boiler work as Slave
To start up the Cascade function, you have to set one off the boilers as Master and the rest have to be set
as Slave. As soon as it is running the system take care of the rest itself.
12.1.2 Start slave power
If the master has been running on an high output for a longer time that set in the delay timer, the master
can start up an slave to get help.
We normal set the start limit to be between
If the load still is over the limit after a new delay time, the master will start one more slave, or a helper, if
no more slave are present in the chain.
Menu / Heating system / Cascade / Start slave power (90)
12.1.3 Stop slave power
Menu / Heating system / Cascade / Stop slave power (40)
This function is works in the same way as start, the load on the master have to be below the limit in more
than the delay time, before a slave will be stopped.
12.1.4 Delay start / stop
Menu / Heating system / Cascade / Delay m. (30)
Since we don’t want the Master to send start or stop command as soon as the load change, we have this
delay time.
So even if the load is higher or lower than the limit, the Master will wait, the time of delay have expired,
before the start or stop command will be send.
12.1.5 Master role
To split the load and the role as Master, between the boilers, we can choose how long time a boiler shall
be master, before it gives the role as Master to the next boiler in the chain.
Menu / Heating system / Cascade / Hours as master (168)
If we set the value to 168 hours, the master will move the role to the next boiler in the chain, is the same
as 7 days.
If the value is set to 0, the Master role will never go to a another boiler.
The value 0 is always used, if the master only has a helper, controlled by a relay, and no other slave.
If the Master faults and goes into alarm mode, it sends the Master role to the Slave in the chain.
If all Slaves are activated, the Master will activate the Oil or Gas boiler, if one of those is a part of the
chain.