Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 69
Domestic hot water preparation with heat pumps 6.3.1
Thermal disinfection
Using the operator panel keypad, domestic hot water tempera-
tures above 60 °C (up to 75 °C) can be programmed via the
"thermal disinfection" menu. Above 60 °C, these temperatures
are reached by the heating element. For higher temperatures to
be reached, the adjusting screw (Chapt. 2.3 on page 22) on the
temperature controller casing must be turned to the right-hand
stop.
NOTE
When the domestic hot water temperature reaches > 60 °C, the heat pump
switches off and the domestic hot water is heated solely by the heating el-
ement. The factory setting for the heating element controller is 65°C.
The water installations for the heating system are to be carried
out according to DIN 1988.
Condensate drain
The condensate hose is attached to the rear of the device. It
should be routed so that the condensate produced can flow away
without obstruction. The condensate should be drained into a U
bend.
The domestic hot water heat pump is wired ready for use: only
the mains plug needs to be plugged into a socket in the building
equipped with an earthing contact.
NOTE
Connection to a heat pump meter is possible if the domestic hot water
heat pump is installed permanently.
6.3.1 Functional description of the domestic hot water heat pump with electric
controller
Various operating modes or time programs can be set on the
controller of the domestic hot water heat pump. On the domestic
hot water heat pumps BWP 30HS and BWP 30HSD, there is still
the option of connecting a 2nd heat generator via an integrated
heat exchanger (1.45 m²) or combining the heat pump with a
photovoltaic plant.
Operating modes
A maximum of two independent shut-off times can be pro-
grammed on the controller. During the shut-off times, the cylinder
is kept at an adjustable minimum temperature in order to avoid
loss of comfort. All other programs are available during this time.
With the integrated heating element, the cylinder is heated as
soon as the operating ranges of the heat pump are not reached.
Using the "Rapid heating" key, it is possible to select whether the
heating element should be active within a set period of time or
whether it should be permanently active.
Ventilation
The ventilation function can be activated. This function comes
into use when the heat pump is switched off, i.e. no domestic hot
water request is pending. In this case, the heat pump's fan con-
tinues to run according to the setpoint. This should ensure a min-
imum quantity of exhaust air independent of heat pump opera-
tion, e.g. in the case of commercial waste heat recovery.
Combination with a second heat generator
An existing heat generator or solar system can be used to heat
the by using the integrated tube heat exchanger (1.45 m²). For
this purpose, a circulating pump can be activated by the control-
ler.
The use of a 2nd heat generator must be activated in the menu.
The 2nd heat generator is requested when the heat pump's op-
erating limits are exceeded, i.e. when the upper or lower air in-
take temperature limit or the maximum permitted domestic hot
water temperature is exceeded. In this case, the 2nd heat gener-
ator has priority over the heating element in the heat pump.
When the 2nd heat generator is activated, it is additionally possi-
ble to select a switching temperature which deviates from the
lower operating limit (air temperature). If this temperature is un-
dershot, heat pump operation is blocked as soon as the set tem-
perature is reached, and the 2nd heat generator is then used.
Alternatively, the domestic hot water heat pump can also be op-
erated in combination with a thermal solar energy system. The
solar circulating pump (accessory) is switched on and the heat
pump switched off as soon as a solar gain is detected. The circu-
lating pump is switched off again when a solar gain is no longer
available or when a temperature limit value is exceeded, either
on the collector or in the cylinder. The solar function has priority
over heat pump operation and the heating element.
ATTENTION!
The collector sensor must be a temperature sensor with the resistance
characteristic curve of a PT1000.
Combination of domestic hot water heat pump and
a photovoltaic plant
The domestic hot water heat pumps BWP 30HS/HSD can also
be combined with a photovoltaic plant. To this end, the heat
pump controller can be connected with an additional evaluation
unit (e.g. inverter checker) via a floating input - the additional
evaluation unit must have a floating NO contact. If sufficient out-
put is available from the photovoltaic plant in "Photovoltaic
mode", the heat pump is started via the NO contact and is set to
the setpoint for photovoltaic operation. The solar function has pri-
ority over the photovoltaic function. The display shows that the
heat pump is being operated using electricity from the photo-
voltaic installation.
Fig. 6.7: Domestic hot water heat pump combined with a photovoltaic plant