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t
T
T min. tank (e.g.35°C)
T targ. (e.g. 45°C)
Recharge active
Recharge suppressed
Disable recharge
The efciency of a solar plant increases as the recharge of the tank from the
boiler decreases. Consequently, „disable recharge“ means that
recharging of the water tank is blocked by the boiler.
Recharge suppression during solar yield
The recharge function of the heating boiler is suppressed while a solar circuit pump is
operating.
Time-controlled disable recharge
Recharge is blocked by the boiler for specic phases via a time program.
Within the preset period of time (for ex. 7 to 19 h), recharge is blocked completely
by the boiler without requiring the minimum temperature to this effect.
Time-/temperature-controlled disable recharge
If a minimum temperature in the tank is exceeded, disable recharge is activated.
This function can be activated in parallel to the time program.
If the preset minimum temperature (e. g. 45°C) in the tank
is exceeded, recharge of the tank is disabled by the boiler.
If, however, the minimum temperature is no longer reached, recharge is enabled
by the boiler no matter whether the time program blocks recharge or not.
Efciency-optimized recharge suppression
If the calculated minimum temperature in the buffer tank is exceeded, the
disabled recharge feature is activated.
The minimum temperature is calculated on the basis of a weighting factor which is speci-
ed by the tter in menu 1.4.3 by the „Emphasis“ parameter: „Emphasis“ can be set to
„High comfort“, „Low comfort“, „Balanced“, „Low solar share“ or „High solar share“; it
species the ratio of recharge (comfort) and solar yield.
Q
t
Solar energy history
t
T
Emphasis
„Low comfort“
t
T
Emphasis
„Low solar share“
A exible minimum
temperature is thus
calculated once per
day which disables the
recharge by the boiler.
This exible minimum
temperature is between
›T min. tank‹ and ›T target‹.
FUNCTIONS FOR BOILER CONTROL
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