HR Heating return
HV Heating flow
KW Cold water
RL Return (solar)
VL Flow (solar)
WW DHW
A
Solar collector
B
Collector temperature sensor
C
Solar station with solar circuit pump
D
Thermostatic water mixer
E
Cylinder temperature sensor QAZ 21.5220
Part no. 7387 818
Use for single solar thermal system as a single circuit control unit for
heating the DHW in the solar DHW cylinder.
If the temperature of the DHW (in the lower section of the DHW cylin-
der) falls below the collector temperature, the DHW is heated by the
solar collector (adjustable differential temperature: 2 - 20 °C).
Note
The controller for the solar DHW cylinder can only be used in con-
junction with a controller for a DHW cylinder (B1 or B2).
Run-on time of the solar circuit pump adjustable from 0 to 120 s (sub-
ject to line length).
Maximum DHW temperature adjustable from 20 to 90 °C.
Safety: the solar circuit pump switches off at 140 °C collector temper-
ature; restarts at 120 °C.
Standard delivery:
■ Button, solar
■ Collector temperature sensor PT-1000
■ Cylinder temperature sensor QAZ 21.5220
■ Controller output for the solar circuit pump
Controller, solar/DHW and central heating
Part no. 7387 786
Use for a larger solar thermal system for heating the DHW in the solar
DHW cylinder and for heat supply to the heating cylinder as a three-
circuit control unit.
The first circuit is used to heat the DHW, the second heats the heating
cylinder back/bottom and the third heats the heating cylinder front/top.
The heating cylinder is heated with an external plate heat exchanger.
Changing over from the DHW cylinder to the heating cylinder starts the
secondary pump. This then operates with the solar circuit pump. For
optimum functioning, the flow rate in the secondary circuit must be
matched to the primary circuit (e.g. with flow meter in the primary and
secondary circuits).
Differential temperature, collector/DHW 2-20 °C.
The following differential temperatures are freely adjustable:
differential temperature, collector/cylinder back/bottom 2-20 °C.
Note
Controller, solar/DHW and central heating can only be used in con-
junction with a controller for a DHW cylinder (B1 or B2).
Run-on time of the solar circuit pump adjustable from 0-120 s (subject
to line length).
Shutdown safety:
■ At 140 °C collector temperature
■ At 95 °C cylinder temperature
Optimised DHW priority (either absolute or no DHW priority).
Cylinder heating with stratification in accordance with the cylinder tem-
peratures via a charging valve for the cylinder front/back.
Standard delivery:
■ Button, solar
■ Collector temperature sensor PT-1000
■ Cylinder temperature sensor QAZ 21.5220
■ Controller output for the solar circuit pump
■ Controller output, charging valve, DHW cylinder
■ Controller output for secondary pump
■ Controller output, charging valve, cylinder back/cylinder front
Control unit
(cont.)
20
PYROT
3
5822 516 GB
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