5 Application guidelines
Installer reference guide
12
EPGA11~ EA9W
Daikin Altherma – Low temperature split
4P556075-1 – 2019.02
INFORMATION
▪ During heating operation of the heat pump, the
heat
pump
operates
to
achieve
the
desired
temperature set via the user interface. When weather-
dependent operation is active, the water temperature is
determined automatically depending on the outdoor
temperature.
▪ During heating operation of the auxiliary boiler, the
auxiliary boiler operates to achieve the desired water
temperature set via the auxiliary boiler controller.
Setup
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.
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
▪ The auxiliary contact can be:
▪ An outdoor temperature thermostat
▪ An electricity tariff contact
▪ A manually operated contact
▪ …
▪ Setup: Connect the following field wiring:
L
N
H
Com
A
K2A
K1A
X2M
BTI
K2A
K1A
Indoor/Auto/Boiler
35 30
X Y
Indoor
B
TI
Boiler thermostat input
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
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
.
0
–30
–25
–20
–15
–10
–5
0
5
20
30
40
50
60
10
T
a
(°C)
T
min
(°C)
T
a
Outdoor temperature
T
min
Minimum weather-dependent setpoint for auxiliary gas
boiler
5.4
Setting up the domestic hot water
tank
5.4.1
System layout – Integrated DHW tank
M
M
b
c
a
d
g
e
h
i
i
i
j
j
f
k
i
HPC1
UI
FHL1
FHL2 FHL3
HPC2
HPC3
a
c
i
a
Outdoor unit
b
Indoor unit
c
Heat exchanger
d
Backup heater
e
Motorised 3‑wave valve (switch between space heating
and domestic hot water)
f
Motorised 3‑way valve (mixing the main zone)
g
Main pump
h
Additional pump
i
Shut-off valve
j
Collector (field supply)
k
Domestic hot water tank
FHL1...3
Floor heating loops (field supply)
UI
User interface (field supply)
HPC1...3
Heat pump convectors (field supply)
