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B) The temperature at the flow sensor is less than the charging temperature setpoint value, but
higher than 40 °C
If in the storage tank the temperature falls below the value for warm 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 heat exchanger loop parallel to operation of the heating loop; the TLP is switched on. If
the temperature at flow sensor VF 1 attains the temperature at storage tank sensor ON SF1, the
SLP is switched on. 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 operates again according to
the heating characteristic; the flow temperature is monitored at sensor VF1. If this is reduced to a
definable fixed value, the TLP is switched off. The SLP is only switched off after two running pe-
riods of the control valve.
If CO2 FB 3 = ON, the SLP is switched off if the temperature at sensor VF2 falls below a definable
fixed value, in all cases however (with CO2 FB 3 = OFF also) after two running periods of the
control valve. The ZP runs according to a time program.
C) The temperature at the flow sensor is less than 40 °C
A drinking water requirement leads to an immediate buildup of the charging temperature via
the heat exchanger loop, i.e. the TLP is switched on. The ZP runs according to the function block
setting. If the temperature at flow sensor VF1 attains the temperature at flow sensor ON SF1, the
SLP is switched on and the UP is switched off.
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 control valve closes and the flow tem-
perature is monitored at sensor VF1. If this is reduced to a definable fixed value, the TLP is swit-
ched off. The UP is switched on. The SLP is only switched off after two running periods of the con-
trol valve.
If CO2 FB 3 = ON, the SLP is switched off if the temperature at sensor VF2 falls below an defina-
ble fixed value, in all cases however (with CO2 FB 3 = OFF also) after two running periods of the
control valve. The ZP runs according to a time program.
D) Summertime operation or switched off operation
A drinking water requirement leads to an immediate buildup of the charging temperature via
the heat exchanger loop, i.e. the TLP is switched on. The ZP runs according to the function block
setting. If the temperature at flow sensor VF1 attains the temperature at flow sensor ON SF1, the
SLP is switched on and the UP remains switched off.
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 control valve closes and the flow tem-
perature is monitored at sensor VF1. If this is reduced to an definable fixed value, the TLP is swit-
ched off. The SLP is only switched off after two running periods of the control valve.
If CO2 FB 3 = ON, the SLP is switched off if the temperature at sensor VF2 falls below a definable
fixed value, in all cases however (with CO2 FB 3 = OFF also) after two running periods of the
control valve. The ZP runs according to a time program.
For heating up of drinking water the following general rule applies: Charging is interrupted after
20 minutes for 10 minutes in order to continue heating operation.
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