Technical data
Control and Regulation 7.4.2
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1) On = Compressor running
2) On = Brine circulating pump running
3) Off = Heat pump in "Heating" mode
On = Heat pump in "Cooling" mode
4) On = Heat circulating pump running
5) Not used
6) On = Antifreeze request, the heat pump is heating
7) On = Heat source without fault
Off = Heat source fault, low-pressure switch active
8) Not used
9) On = Hot water request
10) Not used
11) Flashes during operation
12) Flashes in case of a fault
7.3 Active cooling with reversible heat pumps
Cold is generated actively by reversing the process in the heat
pump. The refrigerating cycle is switched from heating to cooling
operation using a four-way reversing valve.
NOTE
The heat pump is blocked for 10 minutes when it is switched from heating
to cooling operation. This allows the different pressures in the refrigerant
circuit to equalize.
Requests are processed as follows:
Domestic hot water before
Cooling
The heat pump operates as in heating operation during DHW
preparation.
7.4 Function descriptions
The heat pumps with simplified regulation have been designed
for heating and cooling operation with fan convectors. During
heating operation, a heat distribution via panel heating is
possible if the temperature spread of the underfloor heating
system is known. The return set temperature is then calculated
from the maximum flow temperature minus the temperature
spread of the underfloor heating system.
Silent cooling via underfloor heating is not possible since flow
temperatures that are too low could cause a condensate failure.
The simplified regulation of the heat pumps is not capable of
recording or limiting the flow temperatures. Silent cooling is only
possible when providing external regulation devices to limit the
flow temperature in cooling operation.
Separate heat distribution in heating operation via panel heating
and in cooling operation via fan convectors is possible. Switching
the heat distribution system between underfloor heating and fan
convectors, depending on the operating mode, must be realised
via an external regulation device since the simplified control of
the heat pump does not provide a respective feature.
The behaviour of the individual operating modes of the heat
pumps and their simplified regulation is as described below:
7.4.1 Heating operating mode
Start the heat pump by turning the switch (1) to the ON position
(I). Select the operating mode "Heating" (symbol) with switch (3).
Turn the rotary knob (4) to set the desired return temperature.
The scale around the rotary knob describes a selectable
temperature range between min. 10 °C and max. 55 °C. The heat
pump heats until the set return temperature is reached and then
shuts off automatically. If the return temperature drops by 4
Kelvin below the set return temperature, the heat pump switches
on again automatically.
The heat pump also shuts itself off if the flow temperature of the
heating water reaches approx. 58±2 °C or the air intake
temperature falls below the lower operating limit of -20 °C.
After the heat pump has switched off, a restart of the heating
operation is only possible after an idle time of 5 minutes. The
observation of this time interval is ensured by the control of the
heat pump.
An additional 2nd heat generator in the form of an electrical
heating element is integrated with air-to-water heat pumps.
Depending on the switching arrangement, outputs of 2, 4 or 6 kW
can be added with this heating element to support heating. The
heating element is automatically activated by the control of the
heat pump if, after approx. 1 hour, the set return set temperature
is not reached and shuts off together with the heat pump after the
return temperature has been reached.
Exception of room temperature control
(only LAK 10MR)
Different to regulation of the return set temperature of the heat
pump, the desired room temperature for the room temperature
regulation is preselected with the rotary knob (4). The request
takes place via a potentiometer and lies in the range between
min. 15 °C and max. 25 °C. The level required for the heating
water is calculated from the deviation in the room temperature.
The heat pump is shut off when the set room temperature has
been reached. The heat pump is switched on again when the
room temperature drops by 2 Kelvin below the set setpoint.
NOTE
Please note that this type of room temperature regulation responds very
sluggishly. Extended response times can therefore be expected after
changing the room set temperature until the desired room temperature
has adjusted itself.
Bathrooms, kitchens or hallways are not suitable as reference rooms
since they deviate most strongly from the average temperature level of
the entire building. Rooms with heavy sun exposure through large
window surfaces (too warm!) or rooms facing only northward (too cold)
are also unsuitable.
7.4.2 Cooling operating mode
Start the heat pump by turning the switch (1) to the ON position
(I). Select the operating mode "Cooling" (symbol) with switch (3).
Turn the rotary knob (4) to set the desired return temperature.
The scale around the rotary knob describes a selectable