Multiple Rooms - One Lwt Zone - Daikin Altherma H Hybrid EJHA04AAV3 Installer's Reference Manual

8.2.2 Multiple rooms – One LWT zone
Underfloor heating or radiators – Thermostatic valves
EJHA04AAV3 + EHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P531180-1D – 2025.03
▪ The space heating demand signal is sent to one digital input on the gas boiler
(X4/6 and X4/7).
Configuration
Setting
Unit temperature control:
▪ #: [A.2.1.7]
▪ Code: [C-07]
External room thermostat for the main
zone:
▪ #: [A.2.2.4]
▪ Code: [C-05]
Benefits
▪ Efficiency. Underfloor heating has the best performance with the heat pump
system.
▪ Comfort. The combination of the two heat emitter types provides excellent
heating comfort of the underfloor heating.
If only one leaving water temperature zone is needed because the design leaving
water temperature of all heat emitters is the same, you do NOT need a mixing
valve station (cost effective).
Example: If the heat pump system is used to heat up one floor where all the rooms
have the same heat emitters.
If you are heating up rooms with underfloor heating or radiators, a very common
way is to control the temperature of the main room by using a thermostat (this can
either be the user interface or an external room thermostat), while the other
rooms are controlled by so-called thermostatic valves, which open or close
depending on the room temperature.
Setup
A Main leaving water temperature zone
B Room 1
C Room 2
a User interface
▪ The outdoor unit is connected in series with the gas boiler.
▪ The underfloor heating of the main room is directly connected to the gas boiler.
▪ The room temperature of the main room is controlled by the user interface used
as thermostat.
8 Application guidelines
|
Value
1 (Ext RT control): Unit operation
is decided by the external thermostat.
1 (Thermo ON/OFF): When the used
external room thermostat or heat pump
convector can only send a thermo ON/
OFF condition.
A
B C
T
a
Installer reference guide
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