Daikin Altherma 3 WS EWSAH06UD 9W Series Installer's Reference Manual page 44

6 | Application guidelines
Installer reference guide
44
f Aquastat valve (field supply)
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.
▪ The indoor unit does NOT contain an expansion vessel, so you have to install an
expansion vessel in the water circuit of the indoor unit yourself. But for bivalent
operation, also make sure that there is an expansion vessel in the auxiliary boiler
loop. Otherwise when bivalent operation is running and if the Aquastat valve
would close, there would be no expansion vessel in the water circuit anymore.
▪ Install the digital I/O PCB (option EKRP1HBAA).
▪ Connect X1 and X2 (changeover to external heat source) on the digital I/O PCB to
the auxiliary boiler. See
source" [ 4 104].
▪ To setup the heat emitters, see
4
system" [ 30].
Configuration
Via the user interface (configuration wizard):
▪ Set the use of a bivalent system as external heat source.
▪ Set the bivalent temperature and hysteresis.
▪ Set the operation mode to space heating only (no tank operation).
Changeover to external heat source decided by an auxiliary contact
▪ Only possible in external room thermostat control AND one leaving water
temperature zone (see
▪ The auxiliary contact can be:
- An outdoor temperature thermostat
- An electricity tariff contact
- A manually operated contact
- ...
▪ Setup: Connect the following field wiring:
L
H
Indoor/Auto/Boiler
A
K1A
N
B Boiler thermostat input
TI
"9.2.8 To connect the changeover to external heat
"6.2 Setting up the space heating/cooling
"6.2 Setting up the space heating/cooling
Com
Indoor
X2M
35 30
K1A
K2A
system" [
B TI
X Y
K2A
Daikin Altherma 3 WS
4P675765-1 – 2022.04
4
30]).
EWSAH/X06UD