5
Mode of operation
Through use of the instantaneous heating concept, drinking water is heated both hygienically and
with low energy consumption in the
FRISTAR
freshwater station.
If water is drawn from the mains, the
primary circuit
pump transports tank water from a buffer tank
through the plate heat exchanger.
On the
secondary side
of the heat exchanger the drinking water flowing through is heated to the set
temperature. The cooled tank water is returned to bottom layer of the buffer tank.
The
speed control
of the primary circuit pump takes place in the FRISTAR3 controller based on the
readings from the volume flow sensor in the hot water line (flow rate VWW and temperature TWW)
and the temperature sensors in the cold water line (TKW) and the primary flow (TPri). The pump is
controlled with PWM signals. Optimal matching of the control behaviour with the pump, valve and
heat exchanger ensures perfect stabilisation of the outlet temperature.
Der Regler hat einen Wärmemengenzähler integriert, wobei die Werte über die Datenleitung aus
-
gelesen werden können.
Hydraulic circuit diagram
Pre-mixer (recommended)
Temperature
Primary flow
Flow rate sensor and DHW
temperature
Ka
ltw
as
se
rt
em
pe
ra
tu
r
Safety valve max. 6 bar
Primary pump
Summary of Contents for FRISTAR3-WP
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Page 8: ...8 Dimensions Housing dimensions thermal insulation cover W x H x D 366 x 811 x 158 mm...
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