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5.4
T
solar limit
T
set
Solar diff.
Hys.
T
min = 45°C
0311767_HWH_32-129_II_UKUK_V2.4, 2020-01-31
Operating cycle
The water temperature (T
burner is started and stopped. The temperature changes in the water heater are used for
switching the solar heating system on and off (using T
the figure. The controller uses two measured values to calculate this temperature: T
and T
(13). In addition, temperatures S
2
controller. S
is measured in the solar collector. S
1
of the heat exchanger of the storage tank. S
Depending on whether or not hot water is being drawn off, hot water can be pumped from
the storage tank to the water heater. This happens if S
Water is then pumped from the water heater to the storage tank, causing hot water to
flow from the storage tank into the water heater. The pump switches off as soon as S
equal to T
.
1
The other settings that govern the control behaviour are:
•
T
set
T
is the the required water temperature that has been set on the appliance (see
set
section 4.3.3.1). As soon as T
heating the water, but only if the temperature of the heating fluid (S
than the temperature measured at the appliance (sensor S
amount. When T
= T
1
There is one exception to this rule, which is when T
than T
.
set
•
Hysteresis
The moment that T
1
such a heat demand that the gas burner and the solar heating system jointly heat
the water. The solar heating system is only employed when the temperature
measured by S
is a certain (adjustable) value grater than that of S
1
•
T
solar diff
When T
exceeds (T
net
heated by the solar heating system alone. When T
T
= T
), the solar heating system is switched off. The value of T
set
solar limit
adjustable (see section 9.2.8.4).
•
T
solar limit
Preset water temperature at which heating via the solar heating system is stopped
(see section 9.2.8.3).
Fig. Graphical representation of operating cycle
) at the top of the water heater is used to control when the gas
1
, S
and S
1
2
2
is measured at the top of the storage tank.
3
falls below T
1
set
= T
, heating by the solar heating system stops.
set
solar limit
falls below (T
- T
set
solar diff
- T
), the gas burner is shut off and the water is
set
solar diff
A.
B.
T1.
t.
T.
45°C = Minimum tap water
and S
). T
is the curve shown in
1
2
1
are used by the solar heating system
3
is located between the inlet and outlet
is 5 °C higher than T
3
, the solar heating system starts
) is greater
1
) by a given (adjustable)
2
is set to a higher value
solar limit
- hysteresis), the controller registers
.
2
rises above T
(provided that
1
set
Gas burner on
Gas burner off
No heat demand, so water is not
heated
Water heated via solar heating system
Water heated via solar heating system
and gas burner
time
Temperature
temperature
(7)
1
(T
).
top
1
is
3
is
solar diff
45
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