Cosmo Multi 3 Montage- Und Bedienungsanleitung Seite 132

132
7. SOLAR
This function can be used for avoiding an energy loss directly after the solar circuit has been
switched on. The still cold heat transfer medium in the pipework is diverted through a bypass
past the store. Once the fluid is warm enough, the store can be loaded.
Depending on whether the bypass is energised by a valve or by a second pump, a correspond-
ing adjustment can be made in the menu item Type. Depending on the variant, different control
logics are applied:
Pump type
In this version, a bypass pump is placed in front of the solar pump.
The bypass pump is first activated when store loading is possible. If the temperature difference
between the bypass sensor and the store sensor reaches the switch-on temperature difference,
the bypass pump is switched off and the solar pump is switched on instead.
Valve type
In this version, a bypass valve is placed into the solar circuit.
The valve initially remains switched so that the bypass is active when store loading is possible.
If the temperature difference between the bypass sensor and the store sensor reaches the
switch-on temperature difference, the bypass relay operates the valve and solar loading starts.
When the valve variant is selected, the option Inverted is additionally available. When the
Inverted option and the bypass circuit are activated, the relay switches on. If the temperature
difference between the bypass sensor and the store sensor reaches the switch-on temperature
difference, the relay switches off.
External heat exchanger
Solar / Opt. functions / Add new function / Ext. HX
Adjustment
Description
channel
Output Output selection
Store Store selection
Sensor HX Reference sensor external
heat exchanger
Target temp. Target temperature option
Sensor Target temperature refer-
ence sensor
Targ. temp. Target temperature
Switch-on temperature
DTOn
difference
Switch-off temperature
DTOff
difference
Overrun Overrun time
This function is used to link loading circuits that are separated by an external heat exchanger.
The allocated output is energised if one of the selected stores is being loaded and there is a
temperature difference between the sensor of the corresponding store and the reference sen-
sor external heat exchanger.
Any number of the solar stores can be selected.
The output is switched off if this temperature difference falls below the adjusted switch-off
difference.
NOTE:
In systems in which stores are equipped with their own loading pumps, the heat ex-
changer relay controls the primary circuit pump.
If the Target temp. option is activated, the pump speed control logic will change. The con-
troller will remain at the minimum pump speed until the temperature at the allocated sensor
exceeds the adjusted target temperature.
If the temperature at the reference sensor target temperature exceeds the target tempera-
ture by 5 K, the speed of the primary pump will be increased by 10 %. If the temperature again
increases by 5 K, the speed of the secondary pump will be adapted, too. Each temperature
increase by 5 K will lead to an alternating adaptation of the primary and secondary pump speeds.
If the temperature falls, the speed will be reduced correspondingly.
Adjustment range /
Factory setting
selection
system dependent system dependent
system dependent all stores
system dependent system dependent
Yes, No No
system dependent system dependent
15 ... 95 °C 60 °C
1.0 ... 20.0 K 5.0 K
0.5 ... 19.5 K 3.0 K
0 ... 15 min 2 min