Daikin ERGA06EAV3A - Page 49

6 | Application guidelines
Installer reference guide
49
ERGA04~08EA + EHVH04+08SU18+23EA
Daikin Altherma 3 R F
4P629090-1A – 2021.11
B One single room
a Dedicated Human Comfort Interface (BRC1HHDA used as room thermostat)
b Non-return valve (field supply)
c Shut-off valve (field supply)
d Auxiliary boiler (field supply)
e 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.
▪ An expansion vessel is already pre-mounted in the indoor unit. 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 "9.3.8 To connect the changeover to external heat
source"[4131].
▪ To setup the heat emitters, see "6.2 Setting up the space heating/cooling
system"[434].
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).
NOTICE
▪ Make sure the bivalent hysteresis has enough differential to prevent frequent
changeover between indoor unit and auxiliary boiler.
▪ Because the outdoor temperature is measured by the outdoor unit air
thermistor, install the outdoor unit 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.
Changeover to external heat source decided by an auxiliary contact
▪ Only possible in external room thermostat control AND one leaving water
temperature zone (see "6.2Setting up the space heating/cooling system"[434]).