22 Functions in the cascade network
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99E13331xx-mub-en - V08
2022/07
To avoid a temperature mix in the storage tank, the supply of the primary return can be realised
in two different levels by means of a three-way valve. Similar to the individual controller, this
function can be selected in two modes for cascade:
-
Thermostat mode
-
Differential mode
In the thermostat mode, the temperature can be monitored either via the
T cold water cascade
sensor
or via an
external sensor
. The
T cold water cascade
sensor is the highest temperature of
the T-CW sensors of all active modules / domestic hot water modules. For the parameter
External sensor
, you can select between
Server 1 - sensor 2
(only for FriwaMini) or
Server 1 -
sensor 3
(FriwaMidi / FriwaMaxi / FriwaMega).
In the differential mode, the
Server 1 - sensor 3
is used for measuring the storage tank
temperature and is already preset. In order to monitor the temperature in the return line, the
sensor
T cold water cascade
is used for a FriwaMidi / FriwaMaxi / FriwaMega module. For a
FriwaMini module, an
External sensor
can be used for a precise monitoring of the temperature
in the return line. The external sensor can be connected to the input
Server 1 - sensor 2.
The measured values of the external sensors can be read at the SV1- FC3.10 controller at
Menu - Status - Measured values - Sensors.
22.3
Comfort function
When the comfort function is activated, the heat exchanger of the standby module is maintained
in the defined temperature range in the flow line. This allows to ensure a faster hot water
preparation in the cascade network. The setting options in the cascade network are identical to
those for a single controller, see chapter 17.4.
22.4
Thermal disinfection
WARNING
Danger of scalding due to hot water!
If the function is activated, there is the risk of scalding during the defined time window at all
withdrawal points!
Inform user
Make sure to avoid scalding at the installation
This function is also set and monitored via the client. The client transfers the settings to the
controllers of the servers.
