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Operation
Daikin RoCon
Daikin Control unit
008.1543999_00 – 03/2017 – EN
Operating instructions
25
3.6.7 Screed program
The screed program is used exclusively for the specified drying
of newly created screed for floor heating. Here, the heat gen-
erator is operated over several days in accordance with a spec-
ified temperature profile (the basis for the preset temperature
profile is the recommendation of the surface heating federal as-
sociation for screed curing heating).
After entering the technician code in the
"Configuration"
rotary switch setting, the temperatures and the duration of the
screed program can be freely set in the [Screed Program] pa-
rameter at the
"HC Configuration"
level.
The
screed program
is a special function and is not interrupted
by any other operating mode. It can
only
be activated by the
heating expert
for the
direct heating circuit
and/or optionally
connected mixed heating circuits. It must be activated separately
for every heating circuit.
After activation of the screed program, all weather-dependent
control functions of the respective heating circuit are switched off.
The respective heating circuit works, as a constant temperature
control regardless of the operating mode (switching times).
An already started screed program can be deactivated at any
time. After ending the screed program, the parameter is automat-
ically set to "Off" and the heating circuit works according to the
currently set operating mode again.
Function heating
The function heating serves as proof of the production of defect
free work for the heating engineer. A prefabricated heating pro-
tocol related to Daikin floor heating can be found in the Internet
portal of Daikin.
In this sense, the function heating (identical with "Heating" in
EN 1264, section 5.2) is not considered as a heating process to
achieve workability of the screed. Generally, a special screed
curing heating and/or mechanical drying is required for this.
The heating of cement screeds should be carried out at the ear-
liest after 21 days and of anhydrite screeds after 7 days at the
earliest in accordance with the specifications of the manufac-
turer. The first heating begins with a T-HS of 25 °C that must be
maintained for 3 days. Afterwards, the heating is carried out with
the maximum set T-HS for the heating circuit (limited to max.
55 °C), which must be maintained for a further 4 days.
Due to the insulating effect of the DUO heating pipe for the
System 70, the screed function must be carried out at higher tem-
peratures. The temperature profile must be adjusted for this ap-
plication in the [Screed Program] parameter. For System 70, the
heating begins at a temperature of 38 °C which is maintained for
3 days. The set maximum heating circuit temperature (limited to
70 °C) is then maintained for 4 days.
After the described heating process, it is not yet assured that the
screed has reached the required moisture content for workability
of the screed.
The moisture content in the screed must be checked by meas-
urement prior to laying the surface covering.
Screed curing heating
The drying process for the screed cannot be exactly predicted. If
there is a high degree of humidity, sometimes it can stop com-
pletely. The drying process can be speeded up by activating the
floor heating (screed curing heating) or measures such as me-
chanical drying.
Each screed curing heating must be ordered separately by the
client as an extra service in accordance with German con-
struction contract procedures (VOB). The workability of the
screed is a prerequisite for beginning the work of the top floor in-
staller, so that he can produce defect free work.
With standard settings, the combined function and screed curing
heating program can be activated to achieve the required re-
sidual moisture in the screed for workability of the screed (see
fig. 3-20). However, the residual moisture of the screed must ba-
sically be checked metrologically before the flooring can be laid.
More detailed explanations and possible setting values of this function can be found
in chap. 6.2.
Prior to starting the screed program, the [Room thermo-
stat] parameter must be deactivated.
During a short-term power failure, a previously acti-
vated screed function is continued at the point of the
interruption.
Procedure in accordance with EN 1264 Part 4:
For anhydrite and cement screeds, the heating circuits
must be leak tested by a water pressure test after com-
pletion. The leaktightness must be ensured immediately before
and during the laying of the screed. The height of the test pres-
sure is at least 1.3x the maximum permitted operating pressure.
Suitable measures must be taken if there is a risk of freezing,
e.g. use of antifreeze agents or heating the building. If antifreeze
agents are no longer necessary for the intended operation of the
system, the antifreeze agent must be removed by draining and
rinsing the system with at least 3 changes of the water.
t
1
Start temperature 25 °C (38 °C for System 70)
t
2
Maximum heating circuit temperature
t
V
T-HS
Z
Duration of the screed function in days after starting the function
Fig. 3-19 Chronological sequence of the screed program during the
function heating
Fig. 3-20 Chronological sequence of the screed program during the
combined function and screed curing heating (for legend, see
fig. 3-19)
