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Control unit
(cont.)
Controller, space heater
A Pump
B Mixing valve
C Contact sensor QAD 21
3
Controller, DHW cylinder B1
A Pump
B Two-way valve
C Sensor QAZ 21.5220
18
Part no. 7387 825
The space heaters are supplied with maximum flow temperature by
the boiler cylinder system.
The switching of the fan is carried out by on-site switches or controllers.
The flow rate of the heating water is controlled via the return temper-
ature and matched to the output of the space heater (flow control). This
results in optimum cylinder stratification with sustained high tempera-
ture at the cylinder flow. The heating periods (individual day and
seven-day program) can be adjusted via the integrated time switch.
Standard delivery:
■ Button, space heater group
■ Controller output for pump and mixing valve
■ Contact sensor QAD 21
■ Restrictor, bypass
Part no. 7387 853
When its temperature drops, the DHW is reheated via the integral heat
exchanger directly by the boiler or by the buffer cylinder. This is
dependent on a corresponding difference in temperature (either dif-
ferential temperature or fixed temperature control unit).
The heating periods (individual day and seven-day program) can be
individually adjusted via the integral time switch.
Standard delivery:
■ Button, DHW cylinder
■ Controller output for pump and two-way valve
■ Sensor QAZ 21.5220 with sensor well ½" x 200 mm
PYROT
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