Water Connection; Minimum Water Volume; Connecting Hydraulic Lines - Daikin Altherma 3 R ECH2O Installation Und Betriebsanleitung

3.6

Water connection

Important information
CAUTION
If the indoor unit is connected to a heating system with
steel pipes, radiators or non-diffusion-proof floor heating
pipes, sludge and chips can enter the hot water storage
tank and cause blockages, local overheating or
corrosion damage.
▪ Rinse supply lines before filling the device.
▪ Rinse out the heat distribution network (in the existing
heating system).
▪ Install a dirt filter or sludge separator in the heating
return flow (see "1.2.6 Heating system and sanitary
connection" [ 4 6]).
CAUTION
If the indoor unit is connected to a cold water line where
steel pipes are used, chips can get into the stainless steel
corrugated pipe heat exchanger and remain there. This
can lead to contact corrosion damage and subsequently to
leakage.
▪ Flush the feed pipes before filling the heat exchanger.
▪ Install the dirt filter in the cold water supply (e.g. SAS 1
or SAS 2).
CAUTION: BIV only
If the heat exchanger for pressurised solar system
charging (see "3.1
dimensions" [ 4 11], items h + i) is connected to an external
heater (e.g. wood burning boiler) the indoor unit can be
damaged or destroyed due to an excessively high flow
temperature at these connections.
▪ The flow temperature of the external heater should be
limited to max. 95°C.
CAUTION
Corrosion may be caused by air entering the heating water
network and by a quality of the heating water that does not
comply with the requirements
"1.2.5 Requirements for heating and storage water"
Corrosion products (particles) thus created may clog
pumps and valves and cause malfunctions.
▪ Device may not be connected by permeable, flexible
lines.
INFORMATION
Any steam or heating water escaping from the safety valve
must be drained by a suitable blow-off line with constant
gradient in a frost-protected, safe and observable manner.
A expansion vessel suitably sized and preset for the
heating system must be connected to the Daikin Altherma
3 R ECH O. There may not be any hydraulic blocking
2
elements between the heat generator and the diaphragm
expansion vessel.
We recommend installing a mechanical manometer for
filling the heating system.
▪ For potable water lines, observe the provisions of EN 806,
DIN 1988 and the additional applicable national regulations for
potable water installation.
▪ Install the indoor unit close to the withdrawal point to dispense
with the need for a circulation line. If a circulation line is
permissible and mandatory according to local regulations, it must
be installed according to the schematic diagrams in "Hydraulic
System Connection" in the reference manual for the fitter.
Daikin Altherma EHS(X/H)(B)-D
Daikin Altherma 3 R ECH₂O
008.1451099_00 – 07/2020
Dimensions and connection
in accordance with
[ 4 6].
3 Set-up and installation
3.6.1

Minimum water volume

A water volume of at least 5 litres must be ensured in the heating
circuit. The internal water volume of the heat pump internal unit is
not included in this calculation.
INFORMATION
In critical applications or in rooms with high heating loads,
additional water volume may be required.
CAUTION
If several heating circuits are connected to the heat pump
indoor unit, it is important that the minimum water volume
is guaranteed even if only one heating circuit is open.
3.6.2

Connecting hydraulic lines

DANGER: RISK OF BURNING/SCALDING
There is a danger of scalding at hot water temperatures
over 65°C. This is possible when using solar energy if an
external heater is connected, the Legionella protection is
activated, or the target hot water temperature is set to be
greater than 65°C or if the Smart-Grid function is activated.
▪ Install scalding protection (hot water mixer device (e.g.
VTA32)).
INFORMATION
The indoor unit is equipped with a pressure sensor. The
system pressure in monitored electronically and can be
displayed with the device switched on.
Nevertheless, we recommend installing a mechanical
manometer between the indoor unit and the expansion
vessel, for example.
▪ Install the manometer so that it is easy to see when
filling.
Prerequisite: Optional accessories (e.g. solar, backup heater) are
mounted on the Daikin Altherma 3 R ECH
enclosed instructions.
1 Check the cold water connection pressure (maximum 10 bar).
▪ At higher pressure in the drinking water line, a pressure reducer
must be installed.
2 Fix the hydraulic block in place with a screwdriver.
3‒27 Fix the hydraulic block in place when connecting to the top
(left) or to the rear (right)
O as specified in the
2
Installation and operating manual
19