Control Of The 2Nd Heat Generator; Control Of Immersion Heaters; Constantly Regulated Boiler (Mixer Regulation); Variably-Regulated (Gliding) Boiler (Burner Regulation) - Dimplex WPM 2006 plus Instructions De Montage Et De Service

Program Description

9.4 Control of the 2nd Heat Generator

9.4.1

Control of immersion heaters

Supplementary electric heating systems are used in mono
energy systems. These are switched on or off depending on the
heat consumption if the "Mono energy" operating mode is
9.4.2

Constantly regulated boiler (mixer regulation)

When implementing this type of boiler, the boiler water is always
heated to a set temperature (e.g. 70°C) when the command is
issued accordingly by the heat pump manager. This temperature
must be set so high that domestic hot water preparation can also
be carried out using the boiler according to need. Regulation of
the mixer is undertaken by the heat pump manager. If required, it
9.4.3

Variably-regulated (gliding) boiler (burner regulation)

In contrast to the constantly-regulated boilers, variably-regulated
boilers supply hot water at a temperature which is directly based
on the respective external temperature. The three-way reversing
valve has no regulatory function. However, it has the task of
directing the hot water flow past or through the boiler, depending
on the operating mode.
In the case of heat pump only operation, the heating water is
directed past the boiler to avoid losses caused by heat
9.4.4

Special program for older boilers and main cylinder systems

If the 2nd heat generator was requested and the so-called
special program is activated in the menu "Settings - 2nd heat
generator", the 2ndheat generator remains in operation for at
least 30 hours. If the heat consumption is reduced during this
period, the 2nd heat generator goes into "Active stand-by
operation" (2nd heat generator voltage on, but Mixer CLOSED).
It is not fully switched off until there has been no request for the
2nd heat generator for a period of 30 hours.
9.4.5

Bivalent-renewable

When integrating a renewable heat source (e.g. solar, wood),
this must be given priority over heat pump operation (see Fig. 2.4
on p. V). This is done by coding to bivalent-renewable in the
preconfiguration. As long as the renewable cylinder is cold, the
system responds like a mono energy system.
The sensor for the renewable cylinder is connected to the
analogue input N1-B8. The mixer outputs of the bivalence mixer
are active.
NOTE
Heat pumps which are not equipped with an integrated flow sensor must
be retrofitted (N1-B5).
Basic function:
The temperature in the renewable cylinder is measured and
compared with the flow temperature of the corresponding
request (domestic hot water, heating or swimming pool). If the
temperature is above the conditions listed below, the heat pump
is blocked, the renewable cylinder is used as the 2ndheat
generator and the bivalence mixer is activated accordingly.
Block by heating request:
If the temperature in the cylinder is 2-10K higher than the current
flow temperature, the heat pump is blocked by a pending heating
selected in the preconfiguration menu and the set limit
temperature (see Chap. 9.2 on p. 26) is undershot.
calls for the boiler and adds more hot water until the desired set
return temperature or hot water temperature is reached. The
boiler is called via the 2nd heat generator output of the heat
pump manager and the mode of operation of the 2nd heat
generator is coded as being "constant".
dissipation of the boiler. If the system is equipped with
atmospherically controlled burner regulation, the voltage supply
for burner regulation should be disconnected in the case of heat
pump only operation. The boiler is controlled via the 2nd heat
generator output of the heat pump manager, and the mode of
operation of the 2nd heat generator is coded as being "variable".
The characteristic curve of the burner regulation is set according
to the heat pump manager.
This function can be used in bivalent systems as follows:
1) To prevent corrosion damage with older oil or gas boilers
due to frequent undershooting of the dew point.
2) To ensure that with main cylinder systems, tank charging for
the following day is independent of the current heat
consumption.
request. It is not enabled again until the difference between the
renewable cylinder and the flow is less than half of the switching
value.
NOTE
When integrating solar heat sources, adjust the set overtemperature to
the maximum value to prevent the heat pump from surging.
Block by request for domestic hot water:
If the temperature in the cylinder is 5K higher than the current hot
water temperature, the heat pump is blocked by a pending
request for domestic hot water. It is not enabled again until the
difference between the buffer tank connected in parallel and the
domestic hot water is less than 3K.
Block by request for swimming pool water:
If the temperature in the cylinder is higher than 35 °C (value is
adjustable from 10 – 50 °C in the menu Settings - 2nd heat
generator - Overtemperature), the heat pump is blocked by a
pending request for swimming pool water. It is not enabled again
until the temperature in the buffer tank connected in parallel is 5K
under the switching temperature.
As soon as one of the three blocks described occurs, the heat
pump is blocked, and the following message is displayed: HP
9.4
EN-27