E-33
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Initial Heating Program (Drying of Screed Flooring) 11.3
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.
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.
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.
Example:
Max. return temperature: 32 °C
11.3.3 Individual Program for Screed Drying
This program allows the following settings:
Heat up diff. temp.:
Starting from the initial temperature of 20 °C up to the set
maximum temperature, the set temperature is raised by the
set difference with every program step.
The number of steps depend on the following factors.
Heating-up period:
The number of hours can be entered here during which the
corresponding set temperature must be reached and
maintained (function as described above).
Keep period:
The number of hours can be entered here during which the
maximum set temperature must be maintained.
Heat down diff. temp.:
Starting from the set maximum temperature down to the
initial value of 20 °C, the set temperature is reduced by the
set difference with every program step.
The number of steps depend on the following factors.
Heating-down period:
The number of hours can be entered here during which the
corresponding set temperature must be reached and should
be maintained.
Step 1-4: Heating-up sequences
Step 5: Keep
Step 6-8: Heating-down sequences
Step 1-4: 20 / 24 / 28 / 32 °C
Step 5: Keep
Step 6-8: 28 / 24 / 20 °C
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