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System code number 2 with CO2 FB 6 = ON selection: 1 (parallel pump operation)
Processing heating up of drinking water in the storage tank system with parallel pump operation
A) The temperature at the flow sensor is higher than the charging temperature setpoint value
If the temperature in the storage tank falls below the value for drinking water requirement ON at
sensor SF1 or if the temperature falls below the value set at the storage tank thermostat, com-
mencement of storage tank charging initially only leads to a reduction of the excessive flow tem-
perature via the heating loop.
At 5K above the charging setpoint value (measured at flow sensor VF), at the latest after 3 minu-
tes, the SLP starts up. The ZP runs according to the function block setting. If a value of more than 2
K below the charging temperature is registered for a time period of 3 minutes, the UP is switched
off for 10 minutes.
If the requirement is terminated by exceeding the adjustable differential gap at sensor SF1 or the
preset differential gap at the storage tank thermostat, the controller initially runs at a fixed defi-
nable value at sensor VF. When this is attained, at the latest after two running periods of the con-
trol valve, the SLP is switched off and the UP continues.
The ZP runs according to a time program.
B) The temperature at the flow sensor is less than the charging temperature setpoint value, but
higher than 40 °C
If the temperature in the storage tank falls below the value for drinking water requirement ON at
sensor SF1 or if the temperature falls below the value set at the storage tank thermostat, com-
mencement of storage tank charging initially only leads to a buildup of the charging temperatu-
re via the heating loop.
At 5K below the charging setpoint value (measured at flow sensor VF), the storage loading
pump SLP starts up. The ZP runs according to the function block setting. If a value of more than 2
K below the charging temperature is registered for a time period of 3 minutes, the UP is switched
off for 10 minutes.
If the requirement is terminated by exceeding the adjustable differential gap at sensor SF1 or the
preset differential gap at the storage tank thermostat, the controller initially runs at a fixed defi-
nable value at sensor VF. When this is attained, at the latest after two running periods of the con-
trol valve, the SLP is switched off and the UP continues to run. The ZP runs according to a time
program.
C) The temperature at the flow sensor is less than 40 °C
If the temperature in the storage tank falls below the value for drinking water requirement ON at
sensor SF1 or if the temperature falls below the value set at the storage tank thermostat, com-
mencement of storage tank charging leads to an immediate buildup of the charging temperature
via the storage tank, i.e. the UP is switched off and the SLP is switched on. The ZP runs according
to the function block setting.
If the requirement is terminated by exceeding the adjustable differential gap at sensor SF1 or the
preset differential gap at the storage tank thermostat, the controller operates again according to
the heating characteristic; while the control valve is closing the flow temperature is monitored at
sensor VF. If this is reduced down to a fixed definable value, at the latest however after two run-
ning periods of the control valve, the UP is switched on and the SLP is switched off. The ZP runs
according to a time program.
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