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Operation
Daikin RoCon HP
Daikin Control
008.1420844 – 05/2014
Operating instructions
25
3.6.13 Screed Program
The Screed Program is intended exclusively for specified drying
of newly created screed in underfloor heating systems. This op-
erates the heat generator for several days according to a prede-
fined temperature profile (the predefined temperature profile is
based on the recommendations of the Bundesverbandes
Flächenheizungen (Federal Association of Surface Heating
Systems) for heating to cure the floor).
The temperatures and the duration of the Screed Program can be
adjusted as required, after entering the expert code, in the rotary
switch setting
"Configuration"
in the level
"HC Configu-
ration"
in the parameter [Screed Program].
The
Screed Program
is a special function and is not interrupted
by any other operating mode. It can be activated
only
by the
heating expert
for the
direct heating circuit
and/or the op-
tionally connected mixed heating circuits. Each heating circuit
must be separately activated.
Prior to start of the Screed Program, the parameters
[Interlink fct] and [Room thermostat] must have been
deactivated.
In the event of a brief power failure the system contin-
ues with a previously activated screed function in place
of shutting down.
After activation of the Screed Program (parameter [Screed] = On)
all the weather-controlled regulating functions of the relevant
heating circuit are switched off. The relevant heating circuit op-
erates independently of the operating mode (switching times) as
a constant temperature regulator.
An already started Screed Program can be deactivated at any
time. At the end of Screed Programs the screed function the pa-
rameter is automatically set to "Off" and the heating circuit once
again operates according to the currently set operating mode.
Function heating
Function heating verifies that the installation is fault-free for the
heating engineer. A pre-prepared heating up protocol for Daikin
underfloor heating can be found in the Daikin Internet portal.
In this case, function heating (identical with "Heating up" in
EN 1264, section 5.2) does not constitute a heating up process
for drying and curing. Normally you need to carry out separate
heating process to cure the floor and/or performmechanical
drying.
Heating up should be carried out no earlier than after 21 days for
cement screed, and no earlier than after 7 days for anhydrite
screed in accordance with the details provided by the manufac-
turer. The first heating up starts at a feed temperature of 25 °C,
which must be maintained for a period of 3 days. Then heating is
carried out at the maximum flow temperature set for the heating
circuit (limited to max. 55 °C) and this is then held for a further 4
days.
After the heating up process described, there is no guarantee that
the screed has achieved the moisture content required to cure
the floor.
You must determine the moisture content in the screed by meas-
urement before laying the floor covering.
Procedure in accordance with EN 1264 Part 4:
The heating circuits must be checked for leaks by a
water pressure test once the anhydrite and cement
screeds are completed. The absence of leaks must be
ensured immediately before and during screed laying.
The level of the test pressure is at least 1.3 times the
maximum permissible operating pressure.
If there is a danger of freezing up, you must take suita-
ble measures, e.g. the use of antifreeze or temperature
control in the building. If antifreeze is no longer required
for intended use of the installation, you must remove
the antifreeze by draining it out and flushing the instal-
lation with at least 3 changes of water.
t
1
Starting temperature 25 °C
t
2
Maximum heating circuit temperature
t
V
Flow temperature
Z
Duration of screed function, in days, after function start
Fig. 3-18 Sequence of timings of the Screed Program for function
heating
Ready-to-apply heating
The drying out procedure for the screed cannot be predicted ex-
actly in advance. At higher humidity levels in the air this can come
to a complete stop under certain circumstances stop under
certain circumstances. The drying out process may be accel-
erated by running the underfloor heating (curing heating) or by
using measures such as mechanical drying.
Every curing heating process must be commissioned, separately
by the building owner as an extra service in accordance with
VOB. For the flooring contractor to achieve fault-free installation,
the flooring must be properly cured before work is started on the
top flooring layer.
The standard settings can be used to activate the combined
function and curing heating programme in order to achieve a re-
sidual moisture level in the screed required for curing the floor
(see fig. 3-19). The residual moisture level in the screed must,
however, always be checked by measurement before the floor
covering is laid.
Fig. 3-19 The time sequence of the Screed Program in combined func-
tion and curing heating (for legend see fig. 3-18)
More detailed explanations and possible setting values for this function can be seen
in chapters 5.2.3 and 5.13.2.
