Viessmann PYROMAT ECO Technical Manual page 16

Control unit
(cont.)
HC temperature sensor (heating circuit controller)
Part no. 7528 121
3
A QAD 2012 contact temperature sensor
B Pump
C Mixing valve
DHW heating temperature sensor (DHW heating controller)
Part no. 7528 122
T
A Pump
B Control valve
C Pt1000 temperature sensor
D QAD 2012 contact temperature sensor
16
Weather-compensated heating control unit with digital time switch for
setback mode according to individual day and seven-day program,
with pump control unit, frost protection function, eco mode and limited
flow temperature.
Standard delivery
■ QAD 2012 contact temperature sensor
When the temperature at the cylinder temperature sensor falls below
the set value, the circulation pump for cylinder heating starts and the
DHW cylinder is heated.
The flow rate of the heating water is controlled via the return temper-
ature (flow control). This results in optimum stratification of the buffer
cylinder with sustained high temperature at the cylinder flow. The
heating periods (individual day and seven-day program) can be adjus-
ted via the integrated time switch.
Standard delivery
■ QAD 2012 contact temperature sensor
■ Pt1000 temperature sensor (7 6 mm, L = 2000 mm) with sensor
well
Note
The standard delivery does not include positions A and B.
PYROMAT ECO