Initial Heating According To Din En 1264-4; Drying Of Screed Floors; General Information; Standard Program For Screed Drying - Dimplex WPM 2006 plus Instructions De Montage Et De Service

Initial Heating Program (Drying of Screed Flooring)
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.

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.

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, enter the
maximum permissible return temperature, e.g. 32 °C.
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 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 temperature should be
maintained for a period of 264 hours.
The periods in which the maximum return temperature was also
actually reached are totalled up. The upper limit is open and the
lower limit is the Set value - Hysteresis.
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. 7K).
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.
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 set temperature is lowered from the maximum
return 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 temperature
will probably not be undershot at high external temperatures.
For example:
Max. return temperature: 32° C
Step 1-4: 20 / 24 / 28 / 32 °C
Step 5: Keep
Step 6-8: 28 / 24 / 20 °C
11.3
EN-31