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11.2
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 shown.
Step 1:
A constant return flow temperature of 20 °C is to be
maintained for 72 hours (3 days).
Step 2:
The maximum return flow temperature (adjustable)
is to be maintained for 96 hours (4 days).
Step 3:
The heat pump remains off until the return flow
temperature has fallen below 20 °C.
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
11.3.2 Standard Program for Screed Drying
This program consists of 8 steps and is normally suitable for all
underfloor heating systems. Before activation, the the maximum
permissible return flow temperature, e.g. 32 °C, must be
entered.
Step 1-4:
Heating-up sequences
Step 5:
Keep
Step 6-8:
Heating-down sequences
Steps 1 to 4 are heating-up sequences with a duration of 24
hours each. The return set temperature is raised from 20 °C to
the maximum return flow temperature in each step.
Two conditions must be fulfilled to end a program step. The
associated set temperature must be reached or overshot and the
24-hour period must have elapsed. If the temperature is reached
before the 24-hour period has elapsed, the heat pump maintains
the associated set temperature throughout the remaining period.
No evaluation is made of how long this temperature was actually
attained.
In Step 5, the maximum return flow temperature should be
maintained for a period of 264 hours.
The periods in which the maximum return flow temperature was
also actually reached are totalled up. The upper limit is open and
the lower limit is the Set value - Hysteresis.
EN-32
The time period for step 3 is limited to a maximum of 72 hours,
because the return flow 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.
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".
This program step is not ended until the totalled time reaches a
value of 264 hours.
Steps 6 to 8 are heating-down steps with a duration of 24 hours
each. The return flow set temperature is lowered from the
maximum return flow temperature to 20 °C with every step.
Two conditions must be fulfilled to end a program step. The
associated set temperature must be undershot and the 24-hour
period must have elapsed. If the temperature is undershot before
the 24-hour period has elapsed, the heat pump maintains the
associated set temperature throughout the remaining period.
However, no evaluation is made of how long this temperature
was actually attained.
The period for the heating-down sequences is limited to a
maximum of 72 hours because the required return flow
temperature will probably not be undershot at high external
temperatures.
Example:
Max. return flow temperature: 32 °C
Step 1-4:
20 / 24 / 28 / 32 °C
Step 5:
Keep
Step 6-8:
28 / 24 / 20 °C
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