Underfloor Heating Screed Dryout - Daikin Altherma H Hybrid EJHA04AAV3 Installer's Reference Manual

13.4.4 Underfloor heating screed dryout

EJHA04AAV3 + EHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P531180-1D – 2025.03
INFORMATION
The setpoint during a boiler test run is 40°C. Keep in mind the 5°C overshoot that is
possible during boiler operation, especially in combination with floor heating loops.
The underfloor heating (UFH) screed dryout function is used for drying out the
screed of an underfloor heating system during the construction of the building.
Make sure that the leaving water temperature home page, room temperature
home page, and domestic hot water home page are turned OFF.
INFORMATION
▪
If Emergency is set to Manual ([A.6.C]=0), and the unit is triggered to start
emergency operation, the user interface will ask confirmation before starting.
The underfloor heating screed dryout function is active even if the user does NOT
confirm emergency operation.
▪
During underfloor heating screed dryout, pump speed limitation [9‑0D] is NOT
applicable.
NOTICE
The installer is responsible for:
▪
contacting the screed manufacturer for the maximum allowed water
temperature, to avoid cracking the screed,
▪
programming the underfloor heating screed dryout schedule according to the
initial heating instructions of the screed manufacturer,
▪
checking the proper functioning of the setup on a regular basis,
▪
performing the correct program complying with the type of the used screed.
NOTICE
To perform an underfloor heating screed dryout, room frost protection needs to be
disabled ([2‑06]=0). By default, it is enabled ([2‑06]=1). However, due to the
"installer-on-site" mode (see "Commissioning"), room frost protection will be
automatically disabled for 12 hours after the first power-on.
If the screed dryout still needs to be performed after the first 12 hours of power-on,
manually disable room frost protection by setting [2‑06] to "0", and KEEP it disabled
until the screed dryout has finished. Ignoring this notice will result in cracking of the
screed.
NOTICE
For the underfloor heating screed dryout to be able to start, make sure the following
settings are met:
▪
[4‑00]=1
▪
[D‑01]=0
▪
[4‑08]=0
▪
[4‑01]≠1
The installer can program up to 20 steps. For each step he needs to enter:
1 the duration in hours, up to 72 hours,
2 the desired leaving water temperature, up to 55°C.
Example:
13 Commissioning
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Installer reference guide
191