E-32
English
11
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. 32).
The individual programs are activated in the menu “Special
functions - Initial heating prog”).
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 and a fixed hysteresis of ± 0.5 K applies
(independent of the configuration in the menu)
The limit temperature for HG2 is fixed at +20 °C
(independent of the configuration in the menu)
The calculated set temperature applies for all heating
circuits
The mixer of heating circuit 2/3 is switched to continuously
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 initial 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
temperature 35-40 °C).
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. However, for sufficient baking, 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.
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 temperature.
NOTE
The max. return temperature must be entered for the initial heating
program. This is the sum of the max. flow temperature minus the
temperature spread (e.g. 7 K).
11.2 Initial Heating According to DIN EN 1264-4
This program is a recognised function test for underfloor heating
and is carried out after the prescribed waiting time for screed
flooring.
By doing this, any shortcomings in the screed flooring and the
underfloor heating will be noted.
Step 1: A constant return temperature of 20 °C is to be
maintained for 72 hours (3 days).
Step 2: The maximum return temperature (adjustable) is to
be maintained for 96 hours (4 days).
Step 3: The heat pump remains off until the return
temperature has fallen below 20 °C.
The period for step 3 is limited to a maximum of 72 hours
because the return temperature of 20 °C will probably not be
undershot at high external temperatures.
ATTENTION!
Initial heating is used to check the function of the heated floor. The check
must not be carried out any earlier than 21 days after completion of the
screed work in the case of a cement floor and 7 days in the case of a
calcium sulphate floor.
After completion of the screed flooring, the appropriate waiting
time and the initial heating period, determining whether the
screed is dry is a prerequisite for fitting the final floor covering.
11.3 Drying of Screed Floors
11.3.1 General Information
This program is used to reduce the moisture in the screed
flooring to such an extent that the floor covering can be laid.
However, it is still mandatory to measure the moisture content of
the floor as it may be necessary to continue the drying-out
process.
The directive regarding drying out screed flooring calls for a fixed
number of steps with specified temperatures and times. This
sequence can be selected in the menu as “Screed drying -
Standard program”.
In consultation with your screed flooring contractor, the Standard
program should normally be used. It is only necessary to
individually adapt the specified sequence in the Standard
program if there are any special heating-up requirements. In this
case, selections can be made in the menu “Screed drying -
Individual program”.
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