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Start-Up: Air-to-Water Heat Pumps
9.7.5
Primary Pump for Heat Source
The primary pump delivers the energy of the heat source to the
heat pump.
Type of heat pump
Air-to-water heat pump
Brine-to-water heat pump
Water-to-water heat pump
10 Start-Up: Air-to-Water Heat Pumps
When the voltage is restored, air-to-water heat pumps start with
defrosting at external temperatures lower than 14 °C or 10 °C.
The return flow temperature must be at least 18 °C to prevent
defrosting being terminated by the minimum permissible
temperature being undershot on the flow sensor.
By activating the start-up function, the 2nd heat generator is
enabled for a period of one hour, defrosting is disabled and the
current defrosting process is terminated.
11 Initial Heating Program (Drying of Screed Flooring)
The screed flooring heating is carried out according to the
applicable standards and regulations. However, these have to be
adapted to suit the requirements of a heat pump heating system
(see Chap. 11.1 on p. 31).
The individual programs are activated in the menu "Special
functions - Initial heating program").
During heating, the following applies:
The heating pumps for heating circuits 1 and 2 operate
continuously
programmed lowering or raising of the temperature are
overridden. A fixed hysteresis of ± 0.5 K applies
(independent of the configuration in the menu)
The limit temperature for HG2 is fixed at +35 °C
(independent of the configuration in the menu)
The calculated set temperature applies for all heating
circuits
11.1 Implementing the Heat Pump Heating System Directive
The directive is based on whole days for which a specified
temperature is to be reached or maintained.
If the screed flooring has a high moisture content, the specified
temperatures are often not reached within the prescribed period
of time. For the flooring to be sufficiently dried out, however, it is
essential that the temperature level is maintained for a definite
period.
For this reason, the days described in the standard are
implemented as program steps. One program step corresponds
to the combination of the number of days and/or hours and the
respective temperature.
Primary pump
Ventilator
Brine circulating pump
Well pump
The well water or brine circulating pump always operates if the
heat pump is switched off. It starts 1 minute before and switches
off 1 minute after the compressor.
In the case of air-to-water heat pumps, the ventilator is switched
off during defrosting.
The heating pump operates continuously during start-up and
requests for domestic hot water or swimming pool water are
overridden.
NOTE
At low heating water temperatures, heat up the buffer tank first before
gradually opening the individual heating circuits.
The mixer of heating circuit 2/3 is switched to "Continuous
open"
In the case of a fault or voltage interruption, only the
selected program is interrupted. After the voltage is
recovered or the fault is acknowledged, the relevant
program step is continued.
The controller records the data in the HISTORY regarding
the linitial heating program that was last completed.
NOTE
If the manufacturer has not made any special requirements, we
recommend using the standard program for screed drying (max. return
flow temperature 35-40 °C).
NOTE
If no button is pushed within 3 minutes following the activation of an
initial heating program, the display changes every minute.
In the bottommost display line, the current heating-up step, the set
temperature, completed and required hours are displayed.
NOTE
Depending on the ratio between the heat output of the heat pump and the
living space area to be heated, the specified minimum heating-up period
can be exceeded considerably. This is because the required minimum
number of hours are not totalled until after the set temperature has been
reached.
The relevant standards and directives always refer to the flow
temperature of the heating system. Regulation of the heat pump
is based primarily on the return flow temperature.
NOTE
The maximum return flow temperature must be entered for the initial
heating program. This is the sum of the max. flow temperature minus the
temperature spread (e.g. 7K).
11.1
EN-31
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