D e lt a S o l
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collector blocked
A collector is considered to be blocked, if either the sensor
is defective or the emergency shutdown temperature is
reached.
Collector minimum limitation:
Solar/Expert/Tcolmin
adjustment range: -20 ... +200 °F
factory setting: +50 °F
hysteresis 4 °Ra
This is the minimum temperature which must be exceeded
for the solar pump to switch on, if the adjusted minimum
temperature is not exceeded or the condition “collector
blocked” is fulfilled.
By means of this function, the respective tank can be “re-
moved” from solar control. This means that it is no longer
considered for solar loading.
The temperature of the tank will be indicated but a sensor
defect will not be recognized.
St2on ... St4on:
Solar/Options/St2 on (... St4 on)
selection: “Yes”, “No”
factory setting: “Yes”
Tank loading:
Solar/adj. values/
D
Ton (...
D
T4on)
adjustment range: 2.0 ... 40.0 °Ra
factory setting: 12.0 °Ra
Solar/adj. values/
D
Toff (...
D
T4off)
adjustment range: 1.0 ... 39.0 °Ra
factory setting: 8.0 °Ra
If the adjusted switch-on difference
D
Ton between collector
and tank is exceeded, the tank will be loaded.
If this difference falls below the adjusted switch-off diffe-
rence
D
Toff, the loading function will be switched off.
Loading of the tank will also be switched off or suppressed
if the relevant tank or collector is blocked (collector blocked,
see collector minimum limitation) or if the tank is at maxi-
mum limitation.
Solar/adj. values/
D
Tset (...
D
T4set)
adjustment range: 3.0 ... 60.0 °Ra
factory setting: 20.0 °Ra
The parameter “
D
Tset” is the nominal temperature diffe-
rence between collector and tank used for pump speed
control. Once
D
Tset is reached, the pump speed is increased
by 10 %.
If the adjusted maximum temperature Tstmax is exeeded,
loading of the tank is stopped. If the tank cools down by
more than 4 °Ra (hysteresis), the tank will be loaded again.
Tank maximum limitation:
Solar/adj. values/Tstmax (...Tst4max)
adjustment range: 40 ... 200 °F
factory setting: 140 °F
Hysteresis
Solar/Expert/
D
T-Stmax (...
D
T-St4max)
adjustment range: 1.0 ... 10.0 °Ra
factory setting: 4.0 °Ra
tank emergency shutdown
value 200 °F
hysteresis = 4 °Ra
If the cooling options are activated (e.g. collector cooling),
the tank will be loaded beyond the adjusted maximum
temperature.
In order to avoid too high temperatures in the tank, the
emergency shutdown of the tank is additionally provided,
which also blocks the tank for the cooling options. If a tank
reaches the temperature of 200 °F, the emergency shutdown
is active.
tank blocked
A tank is blocked if either the corresponding sensor is
defective or the emergency shutdown temperature has
been reached.
