Setting Up A Solar System Via Drainback Connection - Daikin Altherma 3 R ECH2O Installer's Reference Manual

6 | Application guidelines

6.3.3 Setting up a solar system via drainback connection

Installer reference guide
52
▪ 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
4
source" [ 143].
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" [
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.
A pressureless solar system can be directly connected to the storage tank via
drainback connection.
Setup
1 Integrate the solar system as follows:
a Drainback solar flow connection (optional solar drainback kit)
b Flow sensor (optional solar drainback kit)
c Flow rate limiter (optional)
d Drainback connection
CAUTION
The solar panels MUST be installed higher than the indoor unit. A downward slope
with minimum gradient of the solar piping MUST be guaranteed. This is to allow the
solar system to completely drain and thereby to avoid frost damages.
"9.3.10 To connect the changeover to external heat
4
237] for more information on configuration.
b
c
a
d
ERLA11~16DAV3+W1 + EBSH/X(B)11+16P30+50DF
Daikin Altherma 3 R ECH₂O
4P663482-1A – 2021.11