Functions; Electric Heater - Dimplex Dhw 300Vd+ Montage- Und Gebrauchsanweisung

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7.3 Functions

7.3.1 Time programs
Lower
It is possible to block the operation of the domestic hot water
preparation 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 system and boost (quick-heat) functions, as well as
the function for using electricity from PV-systems, are possible
during shut-off times.
Silent speed
If the Silent function is active, heat pump operation for domestic
hot water preparation takes place with a lower air volume to re-
duce the noise development from the fan.
Two independent time periods or recurring time blocks can be
saved, where the heat pump operation takes place with a re-
duced air volume flow. This leads to a longer heat-up time for the
domestic hot water.
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 electric 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 Electric heater

The integrated electric heater can be used to supplement heat
pump operation. The electric heater is automatically switched on
if the domestic hot water set temperature is not reached within
the set delay time in heat pump operation. In ECO mode, the
electric heater is only requested if the operating ranges of the
heat pump are left and no 2nd heat generator is present. This is
the case, for example, when the air intake temperature is under-
shot/exceeded. With the "Boost" key, the domestic hot water
preparation can be supported with the electric heater for an ad-
justable period of time.
If the air temperature is above -7 °C, the electric heater is
blocked. It can only be switched on manually above the -7 °C
limit for the boost (rapid heating) function.
7.3.3 Second heat generator
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 electric heater in the
heat pump. When the 2nd heat generator is activated, it is addi-
tionally possible to select a bivalence temperature which devi-
EN-16
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 on-site for charging the cylinder
via the additional heat exchanger, which should be operated
where necessary. There are two possible solutions for this:
Controlling 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 pres-
ent, e.g. wood heating buffer tank when using the 2nd heat gen-
erator.
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 of the existing boiler controller is usually required
in the heat pump cylinder. The existing sensor must be con-
nected electrically and remain physically in the unit. To do this,
stow it rolled up in the insulation in the electric heater area and
reduce the setpoints in the menu where necessary. The figure
below shows the position of the sensor R5 to be replaced, which
is connected electrically to the external boiler controller. Recom-
mended depth of the sensor in the pipe approx. 550 mm.
Installation position of the external temperature
sensor for bivalent operation
(device cover removed in illustration)
451905.66.07 · FD 9908
DHW 300VD+
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