5 Application guidelines
Installer reference guide
11
ERGA04~08DAV3(A) + 08S18+23DA
Daikin Altherma – Low temperature split
4P495249-1 – 2017.12
NOTICE
If you install EHVZ models as a single-zone application,
then:
Setup.
Install a bypass between the space heating water
inlet and outlet of the additional zone (=direct zone). Do
NOT interrupt the water flow by closing the shut-off valves.
a
a
Bypass
Configuration.
Set field setting [7-02]=0 (Number of zones
= Single zone).
5.2.1
Multiple rooms – Two LWT zones
This unit is designed to deliver water at 2 different temperatures. A
typical installation consists of underfloor heating at a lower
temperature and radiators at a higher water temperature.
In this document:
▪ Main zone = Zone with the lowest design temperature
▪ Additional zone = Zone with the highest design temperature
Typical example:
Room (zone)
Heat emitters: Design
temperature
Living room (main zone)
Under floor heating: 35°C
Bed rooms (additional zone)
Heat pump convectors: 45°C
Setup
j
k
j
HPC1
FHL1
FHL2 FHL3
HPC2
HPC3
B
A
C
E
D
M
a
b c
g
h
f
d
e
i
i
h
h
h
A
Additional leaving water temperature zone
B
Room 1
C
Room 2
D
Main leaving water temperature zone
E
Room 3
a
Outdoor unit
b
Indoor unit
c
Heat exchanger
d
Backup heater
e
Motorised 3-way valve (mixing the main zone)
f
Additional pump
g
Main pump
h
Shut-off valve
i
Collector (field supply)
j
Remote controller of the heat pump convectors (field
supply)
k
User interface used as room thermostat
HPC1...3
Heat pump convectors (field supply)
FHL1...3
Floor heating loops (field supply)
▪ For the main zone: the room temperature is controlled by the user
interface, which is used as room thermostat (optional equipment
EKRUDAS).
▪ For the additional zone:
▪ The external thermostat is directly connected to the indoor unit.
▪ The desired room temperature is set via the external thermostat
and the thermostatic valves of the radiators in each room.
▪ The heating demand signal from the external thermostat is
connected to the digital input on the indoor unit (X2M/35a and
X2M/30). The indoor unit will only supply the desired additional
leaving water temperature when there is an actual demand.
Configuration
Setting
Value
Unit temperature control:
▪ #: [2.9]
▪ Code: [C-07]
2 (Room thermostat): Unit
operation is decided based on
the ambient temperature of the
user interface.
Note:
▪ Main room = user interface
used as room thermostat
functionality
▪ Other rooms = external room
thermostat functionality
Number of water temperature
zones:
▪ #: [4.4]
▪ Code: [7-02]
1 (Dual zone): Main + additional
In case of heat pump convectors:
External room thermostat for the
additional
zone:
▪ #: [3.A]
▪ Code: [C-06]
1 (1 contact): When the used
external room thermostat or
heat pump convector can only
send a thermo ON/OFF
condition.
Shut-off valve output
Set to follow the thermo demand
of the main zone.
Benefits
▪
Comfort.
The smart room thermostat functionality can decrease
or increase the desired leaving water temperature based on the
actual room temperature (modulation).
▪
Efficiency.
▪ Depending on the demand, the indoor unit supplies different
leaving water temperature matching the design temperature of
the different heat emitters.
▪ Under floor heating has the best performance with Altherma LT.
Содержание Altherma EHVZ04S18DA6V
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