Daikin Altherma 3 H MT ECH2O, Installer'S Reference Manual

Page: 52 / 304

6 | Application guidelines
Installer reference guide
52
EPRA08~W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1 – 2021.07
▪ Make sure the return water to the storage tank does NOT exceed 95°C. To do so:
- Set the desired water temperature via the auxiliary boiler controller to
maximum 95°C.
- Install an aquastat valve in the return water flow of the heat pump. Set the
aquastat valve to close above 95°C and to open below 95°C.
▪ The external heat source is controlled by the ON/OFF signal on the indoor unit
(X12M/3 and X12M/4). See
"9.3.10 To connect the changeover to external heat
source" [
4
129].
Configuration
Via the user interface (configuration wizard):
▪ Set the use of an indirect bivalent system as external heat source, either for
domestic hot water heating only, or also for space heating.
▪ Set the tank boiler hysteresis.
See "Intelligent tank manager" [
4
223] for more information on configuration.
NOTICE
▪
Make sure the tank boiler 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.
6.3.3 Setting up a solar system via drainback connection
A pressureless solar system can be directly connected to the storage tank via
drainback connection.
Setup
1 Integrate the solar system as follows:
a
b
c
d
a Drainback solar flow connection (optional solar drainback kit)
b Flow sensor (optional solar drainback kit)
c Flow rate limiter (optional)
d Drainback connection