Functions; Time Programs - Dimplex DHW 300D Installation And Operating Instructions Manual

DHW 300D - DHW 300D+

7.3 Functions

7.3.1 Time programs

Lower
It is possible to block the operation of the domestic water heat
pump by setting lower times. Two independent lower times can
be programmed. The individual lower times are activated as
soon as the hour or minute value is not equal to zero. During the
lower times, the cylinder is kept at the lower temperature. The
solar thermal and rapid heating functions, and the function for
using electricity from photovoltaic systems are possible during
shut-off times.
Preventative thermal disinfection
The start time for preventative thermal disinfection and the de-
sired setpoint must be set. The function is activated as soon as
the hour or minute value is not equal to zero.
Both the heat pump and the flange heater are switched on from
the start to achieve the set temperature. This ensures that the re-
quired setpoint can be reached as quickly as possible.
NOTE
If the set temperature is not reached within 4 hours, the preventative
thermal disinfection is terminated. The set start time can be activated
every weekday. Preventative thermal disinfection should not be started
after 8pm to ensure that the four hours required are available.
7.3.2 Flange heater
The integrated flange heater can be used to supplement heat
pump operation. The flange heater is automatically switched on
if the domestic hot water set temperature is not reached within 4
hours in heat pump operation. The flange heater is always re-
quested if the heat pump's operating limits are exceeded and no
2nd heat generator is available. This is the case when the air in-
take temperature is undershot/exceeded. Using the "Rapid heat-
ing" key, it is possible to select whether the flange heater should
be active within a set period of time or whether it should be per-
manently active. If the air intake temperature is above -7 °C, the
flange heater is blocked. It can only be switched on manually
above the -7 °C limit for the quick-heat function.
7.3.3 Second heat generator (only
with DHW 300D+)
An existing heat generator can be used to heat the cylinder using
the integrated tube heat exchanger (1 m²) . The use of a 2nd
heat generator must be activated in the menu. It is requested if
the heat pump's operating limits are exceeded. This is the case
when the bottom or top air intake limit or the domestic hot water
setpoint lies above the achievable temperature during heat pump
operation (e.g. preventative thermal disinfection). In this case,
the 2nd heat generator has priority over the flange heater in the
heat pump. When the 2nd heat generator is activated, it is addi-
tionally possible to select a bivalence temperature which devi-
ates from the lower operating limit (air temperature). If this tem-
perature is undershot, heat pump operation is blocked as soon
as the set temperature is reached, and the 2nd heat generator is
then used.
A circulating pump is required for charging the cylinder via the
additional heat exchanger, which should be operated where nec-
essary. There are two possible solutions for this:
EN-12
Activating a circulating pump for using the heat
exchanger through existing domestic hot water
heat pump regulation
This version is recommended if a constant heat source is
present, e.g. wood heating buffer tank when using the 2nd heat
generator.
The circulating pump is connected on terminal X4:
Activating a circulating pump for using the heat
exchanger through existing boiler controller
We recommend this version if, in addition to the circulating pump,
a boiler also has to be switched on to generate the heat. In this
case, a sensor is usually required in the heat pump cylinder,
which is connected to the existing boiler controller. A check must
be carried out to ensure that the existing sensor (NTC-10 charac-
teristic curve, see Cap. 2.4.2 on pag. 4) can be used for connec-
tion to the boiler controller. If this is not the case, the existing sen-
sor must be removed and replaced with a suitable sensor. The
illustration below shows the position of the R5 sensor to be re-
placed. Recommended depth of the sensor in the pipe approx.
550 mm.
Installation position of the external temperature
sensor
(device cover removed in illustration)
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