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Control strategy with constant temperature limits
Your contractor has permanently set the two outside
temperature limits A and B: See Fig. 16 and Fig. 17.
Return temperature
The return temperature is the temperature at which the
heating water or coolant leaves a system component
such as a heating circuit.
Safety valve
Safety equipment that must be installed in the cold
water pipe by your contractor. The safety valve opens
automatically to prevent excess pressure in the DHW
cylinder.
The heating circuits are also equipped with safety
valves.
Smart Grid (SG)
To enable you to use Smart Grid, your contractor has
connected the heat pump control unit to the mains
supply via two switching contacts. The power supply
utility can use these switching contacts to match oper-
ation of the heat pump to the current grid utilisation
level.
The following 4 options for grid utilisation are taken
into account:
1. Not a lot of power in the grid (grid overload):
The power supply utility can block the heat pump if
not a lot of power is available.
The heat pump restarts automatically with the set
operating program as soon as the power supply util-
ity restores the power supply.
During power-OFF, central heating is provided by
the buffer cylinder. If there is no buffer cylinder
installed or its temperature is too low, the rooms will
be heated only by the instantaneous heating water
heater.
Note
Your contractor must enable operation of the instan-
taneous heating water heater during power-OFF
periods.
2. No excess power, normal grid utilisation:
The heat pump is operated according to its settings
and on the agreed terms (electricity price).
3. Small amount of excess power:
The power supply utility provides the power at a low
price.
If a time phase is active in the time program, the
heat pump is started. To make use of low-cost elec-
tricity, additional energy can be stored in your sys-
tem. For this purpose, your contractor may have
increased (or reduced, for cooling) the set tempera-
ture values for the following functions:
DHW heating
Buffer cylinder heating
Central heating
Room cooling
4. Large amount of excess power:
The power supply utility provides the excess power
at no cost.
The power supply utility starts the heat pump imme-
diately, even if no time phase is active in the time
program. System components are heated to the
max. possible temperatures or cooled to the min.
possible temperatures.
Information about operation with low-cost and free
electricity
The electric power consumption of the heat pump is
not taken into account when calculating the seasonal
performance factor.
Example: Utilisation of excess power for DHW
heating
Low-cost excess power
The heat pump is operated with excess power from the
power supply utility to heat DHW to the increased set
DHW temperature.
Appendix
Terminology (cont.)
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65


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