User manual

29
741.011 | 12.18
EN
11.3.1 Holiday – recooling
Attempts to reduce, or even to avoid, the system standstill (stagnation)
times at high temperatures. To do this, at night the storage tank is dis-
charged as far as possible to the set minimum temperature, if the stor-
age tank temperature during the day was 10 K below the set maximum
temperature.
Stagnation occurs when not enough hot water is removed form the
system during an absence (holiday).
Notes
The following applies to this function:
• Only activate if you intend to be absent for an extended period.
• Deactivate this after returning from a holiday in order to avoid an
unnecessary waste of energy via the collector circuit.
Display Characteristic min. max.
Factory
setting
Activation on, oFF
oFF
Minimum storage tank temperature 0 °C 95 °C 35 °C
11.3.2 Reduction of stagnation phases
Delays the end of the storage tank's loading phase in order to reduce, or
even to avoid, the system standstill (stagnation) times at high tem-
peratures. To do this, the pump is stopped repeatedly, and only briefly
switched on again at high collector temperatures. Since the efficiency
drops heavily at high collector temperatures, the loading takes longer
and possible stagnation occurs later.
Display Characteristic min. max.
Factory
setting
Activation on, oFF
oFF
11.3.3 Interval
Periodically switches the solar circuit pump on and off in order to meas-
ure the actual collector temperature. The delay between 2 switch-on
operations and the switch-on duration can be set. Applications:
• Collector types where the mechanical construction prevents the
temperature from being measured at a suitable place
• Unsuitable position of the temperature sensor on the collector
The function can be time restricted to prevent unnecessary periodic
operation at night.