53
4.3.2
Supplementary Heating, 1 combi-storage tank, plate heat exchanger
If, in the 'System
selection’'
menu, the points
"Supplementary
Heating",
"1 combi tank" and "Plate
heat exchanger" are
selected, the hydraulic
diagram illustrated here
is available for use as a
basic system (basic) with
the indicated variants.
•
"Basic" diagram: The regulator constantly records the differential temperature between the sensors
T1 and T2. If the set switch-on differential temperature (parameter: 'diff. temp. solar ON') is
reached, the solar circuit pump R2 switches on and heats the solar circuit with the plate heat
exchanger. The R2 speed control regulates the temperature of the solar flow (advance) (T1) to the
"Required loading temp." value +5 Kelvin. If the temperature level on the plate heat exchanger T3
reaches a value of at least 5 Kelvin more than the ‘lower part of the storage tank' temperature T2,
R1 switches on with minimum speed and then regulates the temperature of the charging current at
the required value (parameter: 'charging setpoint'). This happens until either the maximum storing
temperature (parameter: ''storage max.') is reached or the differential temperature between T3 and
T2 falls below a value of 3Kelvin. The solar circuit pump R2 remains active until the maximum
storing temperature (parameter: ''storage max.') is reached or falls below the switch-off differential
temperature of the solar circuit (parameter: 'diff. temp. solar OFF'). To protect the charging circuit
from overheating, the solar circuit is deactivated when T3 is only 3 Kelvin below the maximum
storing temperature (parameter: 'Max. charging temp.'). If the charging circuit continues to heat up
because of an erroneous function R1 is also deactivated when the maximum storing temperature is
reached.
Supplementary heating is provided with the 3-way valve R3 and the sensors T5 and T6. If the
differential temperature between T5 and T6 reaches the required value (parameter: 'Ret. flow incr.
ON') the 3-way valve guides the heating return flow over the 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 T4 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.
•
"Basic - R" diagram: In some cases the solar circuit pump must be controlled according to the
solar radiation. For this reason, a S7 radiation sensor must be installed in the collector level. For
control purposes T1 must be inserted between the collector and bypass. 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 other.
R4
Basic-AH
T1
or S7 (radiation sensor) for Basic-R
