Froling T4e - 4.10.3 Cascade - Service

Parameters overview | 4
B1820023_en | Service handbook Lambdatronic H 3200 - T4e 69
Start point 2 at storage tank charge
If the storage tank charge is lower than this value, the
second boiler is started.
Average storage tank temperature [°C]
Storage tank charge status CS [%]
Boiler temperature setpoint
Charging curve
Start boiler 1
Storage tank fully charged
Start boiler 2
Start point 3 at storage tank charge
If the storage tank charge is lower than this value, slave
boilers 3 and 4 are started.
Start point 3 at storage tank charge
Average storage tank temperature [°C]
Storage tank charge status CS [%]
Boiler temperature setpoint
Charging curve
Start boiler 1
Storage tank fully charged
Start boiler 2
Start boilers 3, 4
Quick start if buffer tank discharge is greater than
(% / 10min)]
If the storage tank discharge is greater than the set value
within 10 minutes, the boiler with the greatest rated heat
output will be started (quick start).
Reduce the overall output of the cascade before
the storage tank is fully charged
When the storage tank charge exceeds the value which is
set under “Start point 1 at storage tank charge”, the boiler
control variable for the boilers that are still active will be
reduced using the boiler loading pump.
4.10.3 Cascade - Service
System menu Cascade
Boiler priorities are used to specify the sequence in which the boilers start. Where boilers have the same
priority, the boiler currently with the fewest operating hours always starts first.
With this setting the master boiler always starts first as it has the highest priority; the boilers then start in
numerical order.
Start priority of the master boiler 1
Start priority of slave boiler 1 2
Start priority of slave boiler 2 3
Start priority of slave boiler 3 4
With this setting the current number of operating hours is used as the start criterion as all boilers have equal
priority.