Daikin Altherma H Hybrid EJHA04AAV3 Installer's Reference Manual page 52

8 | Application guidelines
Underfloor heating or radiators – Multiple external room thermostats
Installer reference guide
52
▪ A thermostatic valve is installed before the underfloor heating in each of the
other rooms.
INFORMATION
Mind situations where the main room can be heated by another heating source.
Example: Fireplaces.
Configuration
Setting
Unit temperature control:
▪ #: [A.2.1.7]
▪ Code: [C-07]
Benefits
▪ Cost effective. You do NOT need an additional external room thermostat.
▪ Easy. Same installation as for one room, but with thermostatic valves.
Setup
A Main leaving water temperature zone
B Room 1
C Room 2
a User interface
b External room thermostat
c Bypass valve
▪ For each room, a shut-off valve (field supplied) is installed to avoid leaving water
supply when there is no heating demand.
▪ A bypass valve must be installed to make water recirculation possible when all
shut-off valves are closed. To guarantee reliable operation, provide a minimum
water flow as described in table "To check the water volume and flow rate" in
"9.3 Preparing water
▪ The room thermostats are connected to the shut-off valves, and do NOT have to
be connected to the outdoor unit. The outdoor unit will supply leaving water all
the time, with the possibility to program a leaving water schedule.
Configuration
Setting
Unit temperature control:
▪ #: [A.2.1.7]
▪ Code: [C-07]
2 (RT control): Unit operation is
decided based on the ambient
temperature of the user interface.
A
B
M1
b
a
4
piping" [ 67].
0 (LWT control): Unit operation is
decided based on the leaving water
temperature.
Value
C
c
M2
b
Value
EJHA04AAV3 + EHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P531180-1D – 2025.03