Setting Up The Domestic Hot Water Tank; System Layout - Integrated Dhw Tank - Daikin Altherma EAVX-D9WG Installer's Reference Manual

5 Application guidelines
NOTICE
▪ Make sure the auxiliary boiler and its integration in the
system complies with applicable legislation.
▪ Daikin is NOT responsible for incorrect or unsafe
situations in the auxiliary boiler system.
▪ Make sure the return water to the heat pump does NOT exceed
55°C. To do so:
▪ Set the desired water temperature via the auxiliary boiler
controller to maximum 55°C.
▪ Install an aquastat valve in the return water flow of the
heat pump. Set the aquastat valve to close above 55°C and to
open below 55°C.
▪ Install non-return valves.
▪ Make sure to only have one expansion vessel in the water circuit.
An expansion vessel is already pre-mounted in the indoor unit.
▪ Install the digital I/O PCB (option EKRP1HB).
▪ Connect X1 and X2 (changeover to external heat source) on the
digital I/O PCB to the auxiliary boiler thermostat.
▪ To setup the heat emitters, see
cooling system" on page 10.
Configuration
Via the user interface (quick wizard):
▪ Set the use of a bivalent system as external heat source.
▪ Set the bivalent temperature and hysteresis.
Changeover to external heat source decided by an auxiliary
contact
▪ Only possible in external room thermostat control AND one
leaving water temperature zone (see
heating/cooling system" on page 10).
▪ The auxiliary contact can be:
▪ An outdoor temperature thermostat
▪ An electricity tariff contact
▪ A manually operated contact
▪ ...
▪ Setup: Connect the following field wiring:
L
Com
H
Indoor/Auto/Boiler
A
K1A K2A
N
B Boiler thermostat input
TI
A Auxiliary contact (normal closed)
H Heating demand room thermostat (optional)
K1A Auxiliary relay for activation of indoor unit (field supply)
K2A Auxiliary relay for activation of boiler (field supply)
Indoor Indoor unit
Auto Automatic
Boiler Boiler
Installer reference guide
16
"5.2 Setting up the space heating/
"5.2 Setting up the space
Indoor
B TI
X2M
35 30 X Y
K1A K2A
NOTICE
▪ Make sure the auxiliary contact has enough differential
or time delay to prevent frequent changeover between
indoor unit and auxiliary boiler.
▪ If the auxiliary contact is an outdoor temperature
thermostat, install the thermostat in the shadow so that
it is NOT influenced or turned ON/OFF by direct
sunlight.
▪ Frequent changeover may cause corrosion of the
auxiliary boiler. Contact the manufacturer of the
auxiliary boiler for more information.
Setpoint of the auxiliary gas boiler
To prevent freeze-up of the water piping, the auxiliary gas boiler
must have a fixed setpoint ≥55°C, or a weather-dependent setpoint
≥T .
min
T (°C)
min
60
50
40
30
20
10
0
–30 –25 –20 –15
T Outdoor temperature
a
T Minimum weather-dependent setpoint for auxiliary gas
min
boiler
5.4 Setting up the domestic hot water
tank
5.4.1 System layout – Integrated DHW tank
a c
b d
e
a Outdoor unit
b Indoor unit
c Heat exchanger
d Backup heater
e Pump
f Motorised 3‑way valve
g DHW tank
h Shut-off valve
i Collector (field supply)
FHL1...3 Under floor heating
UI User interface
EPGA11~16DAV3 + EAVH/X16S18+23DA6V+9W
–10 –5 0
T (°C)
a
UI
f h h i
M
FHL1
FHL2
FHL3
g
Daikin Altherma – Low temperature split
4P556070-1 – 2019.02
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