7 Application guidelines
Installer reference guide
21
EJHA EHY32AA
Daikin Altherma Hybrid hydrosplit heat pump
4P531180-1 – 2018.06
Configuration
Setting
Value
Unit temperature control:
▪ #: [A.2.1.7]
▪ Code: [C-07]
0 (LWT control): Unit operation is
decided based on the leaving
water temperature.
7.3
Setting up the space heating
system – In case of third-party gas
boiler
The heat pump system supplies leaving water to heat emitters in one
or more rooms.
Because the system offers a wide flexibility to control the
temperature in each room, you need to answer the following
questions first:
▪ How many rooms are heated by the heat pump system?
▪ Which heat emitter types are used in each room and what is their
design leaving water temperature?
Once the space heating requirements are clear, Daikin recommends
to follow the setup guidelines below.
NOTICE
If an external room thermostat is used, the external room
thermostat will control the room frost protection. However,
the room frost protection is only possible if the leaving
water temperature control on the unit's user interface is
turned ON.
INFORMATION
In case an external room thermostat is used and room frost
protection needs to be guaranteed in all conditions, then
you have to set auto emergency [A.6.C] to 1.
7.3.1
Single room
Under floor heating or radiators – Wired room
thermostat
Setup
a
B
A
A
Main leaving water temperature zone
B
One single room
a
User interface used as room thermostat
▪ The outdoor unit is connected in parallel with the gas boiler.
▪ The circuit contains external pump.
▪ The under floor heating of the main room is connected via 2 non-
return valves to the outdoor unit and the gas boiler.
▪ The room temperature is controlled by the user interface, which is
used as room thermostat.
Configuration
Setting
Value
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.
Benefits
▪
Cost effective.
You do NOT need an additional external room
thermostat.
▪
Highest comfort and efficiency
. The smart room thermostat
functionality can decrease or increase the desired leaving water
temperature based on the actual room temperature (modulation).
This results in:
▪ Stable room temperature matching the desired temperature
(higher comfort)
▪ Less ON/OFF cycles (more quiet, higher comfort and higher
efficiency)
▪ Lowest possible leaving water temperature (higher efficiency)
▪
Easy
. You can easily set the desired room temperature via the
user interface:
▪ For your daily needs, you can use preset values and schedules.
▪ To deviate from your daily needs, you can temporarily overrule
the preset values and schedules, use the holiday mode.
7.3.2
Multiple rooms – One LWT zone
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.
Under floor heating or radiators – Thermostatic
valves
If you are heating up rooms with under floor 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
B
a
C
T
A
Main leaving water temperature zone
B
Room 1
C
Room 2
a
User interface
▪ The outdoor unit is connected in parallel with the gas boiler.
▪ The circuit contains external pump.
▪ The under floor heating of the main room is connected via 2 non-
return valves to the outdoor unit and the gas boiler.
