Cosmo Multi 3 Montage- Und Bedienungsanleitung Seite 136

136
7. SOLAR
S1
Booster pump
R1 R2
S4/TR
Exemplary drainback system layout (R2 = booster
pump)
In the Cooling mode menu, different cooling functions are available. They can be used for
keeping the solar system operational for a longer time during strong solar irradiation.
For this purpose, the adjusted maximum store temperatures can be exceeded. The store order
for this overloading can be adjusted. Additionally, each individual store can be excluded from
this function.
2 different variants are available for the cooling mode: the system cooling and the collector cooling.
System cooling type
If the switch-on temperature difference is exceeded, the stores continue to be loaded even if
their corresponding maximum temperature is reached, but only up to the emergency shutdown
temperature. Store loading continues until all stores have reached the emergency shutdown
temperature or until the switch-off temperature difference is reached.
Collector cooling type
If the collector maximum temperature is exceeded, the stores will be loaded above their respec-
tive maximum temperature.
Store loading continues until all stores have reached the emergency shutdown temperature or
until the collector temperature falls below the collector maximum temperature by at least 5 K.
The control logic considers collector cooling operation to be solar loading. The adjusted values
for delay, minimum runtime etc. remain valid.
Additionally to each of the two variants, the store cooling option can be activated.
Store cooling option
When the store cooling option is activated, the controller aims to cool down the store during the
night in order to prepare it for solar loading on the following day.
The store cooling option is active, if the maximum store temperature is exceeded. If, in addition
to that, the collector temperature falls below the store temperature, the solar pump switches
on. The solar pump remains active until the store temperature falls below the adjusted maxi-
mum store temperature.
The store order for the cooling is the same as in the overheating through system- or collector cooling.
Drainback option
Solar / Opt. functions / Add new function / Drainback
Adjustment
channel
Filling time
Stab. time
Initialis.
Booster
Output
Drain impulse
Delay
Duration
Funct.
Sensor
In a drainback system the heat transfer fluid will flow into a holding tank if solar loading does not
take place. The drainback option initiates the filling process if solar loading is about to start.
NOTE:
A drainback system requires additional components such as a holding tank. The drain-
S3
back option should only be activated if all components required are properly installed.
The filling time can be adjusted using the parameter Filling time. During this period, the pump
S2
runs at maximum speed.
The parameter Stab. time is used for adjusting the time period during which the switch-off
condition will be ignored after the filling time has ended.
Description
Drainback flling time
Stabilisation time
Initialisation time
Booster option
Output selection booster
pump
Drainback impulse option
Delay time
Drain impulse loading
duration
Activation / Deactivation
Switch input selection
Adjustment range /
Factory setting
selection
1 ... 30 min 5 min
1.0 ... 15.0 min 2.0 min
1 ... 100 s 60 s
Yes, No No
system dependent system dependent
Yes, No No
1 ... 30 min 3 min
1 ... 60 s 10 s
Activated, Deactivated, Deactivated
Switch
- -