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3.3 Thermal control valve
The thermal control valve allows for an automatic opening of the bypass in the startup phase.
t
t
<
KR
FIX
t
= t
KR
BY
t
= t
KR
FIX
t
< t
KR
BY
t
> t
KR
PR
t
≥ t
KR
FIX
t
= t
KR
PR
Temperatures:
t
= bypass
BY
t
= Tank return
PR
B-8
1. The control valve shuts off the connection to the
buffer tank, as long as the water in the boiler circuit
is colder than the opening temperature of the
control valve. The pump circulates the water
through the bypass, the small quantity of water in
the boiler circuit can now heat up quickly.
2. When the boiler circuit reaches the opening
temperature of the control valve, the valve closes
the bypass and opens the line to the buffer tank
circuit. The cold water from the buffer tank return is
mixed with the hot boiler circuit water in the control
valve. Thus, the return temperature to the boiler
circuit is increased to the desired level and
condensation in the boiler is prevented.
3. When the buffer tank return temperature is higher
than the opening temperature, the control valve
completely shuts off the bypass. The water from
the buffer tank circuit now flows directly into the
boiler circuit.
t
= boiler return
KR
t
= opening temperature
FIX
99961255DeD01-mub-ml – V01
3 Product description
2014/08
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