55
4.3.3
Supplementary Heating, 2 storage tanks
If, in the 'System selection’'
menu, the points
"Supplementary Heating"
and "2 storage tanks" are
selected, the hydraulic
diagram illustrated here is
available for use as a
basic system (basic) with
the indicated variants.
•
"Basic" system: The regulator constantly records the differential temperature between the
sensors T1 and T2 or T1 and T4. If the preset switch-on differential temperature (parameter: 'diff.
temp. solar ON') is reached by one of the differential temperatures, either solar circuit pump R1 is
switched on for storage tank 1 or solar circuit pump R2 for storage tank 2. If the storage tank
currently about to be charged is the first storage tank on the priority list (parameter -> storage tank
priority...), this is charged until it reaches its maximum storing temperature (parameter: 'storage
tank x max.') or falls below the switch-off differential temperature (parameter: 'diff. temp. solar
OFF'). Then, if the switch-on condition of the secondary storage tank is met, the corresponding
solar circuit pump is switched on. When the secondary storage tank is being charged it is checked,
at regular intervals (“storage tank priority...” -> “Test interval”), whether the priority storage tank can
be charged again. For this purpose the solar circuit pump is deactivated for a short period (“storage
tank priority...” -> “Test period”). If the priority storage tank reaches its switch-on temperature within
this period, this will be charged again.
Supplementary heating is provided by the 3 way valve R3 and the sensors T4 and T5. If the
differential temperature between T4 and T5 reaches the set value (parameter: 'Ret. flow. incr. ON')
the 3 way valve guides the heating return flow over the corresponding storage tank. The valve
remains in this position until the differential temperature falls below the switch-off value (parameter:
'Ret. flow. incr. OFF') again.
Definition: Storage tank is not flown through when the 3-way valve R3 is in a de-energized
state (no return flow increase)!
The additional function shown (after-heating) is not activated.
•
Add-on
"
- AH": R4 and T6 combined with an oil or gas boiler can provide after-heating. A detailed
functional description of this add-on can be found on page 15.
To prevent erroneous settings, the described switch-on and switch-off values are interlocked,
this means they can be set only at a specific value to one another.
T2
R1
storage
tank 1
T4
storage
tank 2
R2
R4
Basic-AH
T3
T1
