Daikin ERLA14D V3 Series Installer's Reference Manual page 50

6 | Application guidelines
Installer reference guide
50
▪ When there is a heating request, the indoor unit or the auxiliary boiler starts
operating. Which of these units operates, depends on the outdoor temperature
(status of the changeover to external heat source). When the permission is given
to the auxiliary boiler, the space heating by the indoor unit is turned OFF.
▪ Bivalent operation is only possible if:
- Space heating is turned ON, and
- Tank operation is turned OFF
▪ Domestic hot water is always produced by the storage tank connected to the
indoor unit.
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
▪ Integrate the direct (SH) auxiliary boiler as follows:
A Main leaving water temperature zone
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 60°C. To do so:
- Set the desired water temperature via the auxiliary boiler controller to
maximum 60°C.
- Install an aquastat valve in the return water flow of the heat pump. Set the
aquastat valve to close above 60°C and to open below 60°C.
a
e
c
d
c
b
A
b
B
ERLA11~16D + EBSH/X(B)11+16P30+50D
Daikin Altherma 3 R ECH₂O
4P663482-1C – 2023.05