Frost Protection - Cosmo Multi 2 Montage- Und Bedienungsanleitung

4. Functions and options
Recooling:
Solar/Options/recooling
selection: „Yes", „No"
factory setting: „No"
2-collector systems:
Combination with collector cooling function:
2-collector system:

Frost protection:

Solar/Options/Frost prot.
selection: "Yes", "No"
factory setting: „No"
2-collector system:
This function is used for keeping the system tempe-
ratures and consequently the thermal load as low as
possible.
If the temperatures of all stores of the system have
exceeded the maximum temperature, the Tstmax for
the first store is temporarily overidden to reduce the
surplus energy via the pipework and the collector. Note
Tstmax may be exceeded so additional scald protection
may be required.
This "circulation" is switched off once the maximum
store temperature is underrun by 2 K.
Both collector circuits are activated in a 2-collector
system.
If the option "collector cooling" is activated in addition
to the recooling function, the behaviour of the recooling
function changes.
The objective is now to dissipate the energy supplied
by collector cooling.
If the temperature at the collector decreases by 5 K
below that of the store, the recooling function becomes
active and the loading circuit is again operated to cool
the store.
If the difference between collector and store decreases
below 3 K during that cooling period, the function is
switched off.
In a 2-collector system, the collectors are operated
separa tely, using the switch-on conditions described
above.
As soon as the temperature at the collector is 4 °C, the
frost protection function operates the loading circuit
between the collector and the 1
tect the medium in the loading circuit against freezing
or coagulation.
If the collector temperature exceeds 5 °C, this function
is switched off.
If the 1 store in the system is blocked, this function is
st
switched off or suppressed.
The pump output uses maximum pump speed.
In these systems, the circuit which fulfills the switch-on
condition described above is operated.
93
store in order to pro-
st