Connecting An External Heat Generator - Daikin Altherma 3 R ECH2O Installation Und Betriebsanleitung

3.7.9

Connecting an external heat generator

INFORMATION
To connect an external heat generator, the connection set
for external EKBUHSWB heat generators must be installed
(see "3.5 Installing optional
For heating support or as an alternative to an electric backup heater,
an external heat generator (e.g. gas- or oil-fired boiler) can be
connected to the indoor unit. To connect an external heat generator,
the connection set for external EKBUHSWB heat generators must
be installed (see "3.5 Installing optional
The heat supplied by the external heat generator must be fed to the
unpressurised storage tank water in the hot water storage tank of the
indoor unit.
Implement the hydraulic connection according to one of the two
following options:
▪ unpressurised via the connections (solar flow and solar return
flow) of the hot water storage tank
▪ for ...Biv indoor unit device types, via the integrated
pressurised solar heat exchanger.
▪ Comply with the instructions on hydraulic connections (see
"1.2 Safety instructions for installation and
▪ Examples of hydraulic connection (see "Hydraulic connection"
in the reference manual for the fitter).
The external heat generator request is connected on PCB RTX-EHS
(see " 3‒38 Connection on the RTX-EHS PCB"
relay. Electrical connection to the indoor unit is possible as follows:
▪ External heat generator has a potential-free switching contact
connection for heat request:
▪ Connection to K3 if the external heat generator is responsible
for the domestic hot water preparation and the backup heating
(setting of the [Config. ext. heat source] parameter = DHW +
heating support [→ Main menu → Settings → Ext. source])
or
▪ Connection to K1 and K3 if two external heat generators are
used (setting of the [Config. ext. heat source] parameter = Two
external heat generators [→ Main menu → Settings → Ext.
source]). In this case, K1 connects the external heat generator
(e.g. gas-fired or oil-fired boiler) for heating support and K3
connects the external heat generator (EKBUxx) for domestic
hot water preparation.
or
▪ Connection to AUX connection A (see
outputs)" [ 4 27])
switching contacts (AUX
▪ External heat generator can only be connected via mains voltage:
Connection (~230 V, maximum load 3000 W) to K1 and K3.
CAUTION
Danger of voltage flash-overs.
▪ The connections of the RTX-EHS PCB must not be
used simultaneously for connecting mains voltage
(~230 V) and SELV ("Safety Extra Low Voltage").
Daikin Altherma EHS(X/H)(B)-D
Daikin Altherma 3 R ECH₂O
008.1451099_00 – 07/2020
accessories" [ 4 18]).
accessories" [ 4 18]).
operation" [ 4 4])
[ 4 25]) via a
"3.7.13 Connecting
3 Set-up and installation
3‒38 Connection on the RTX-EHS PCB
1 Refer to the external heat generator's respective installation
instructions for a suitable electrical connection.
2 Installing the connection set for external EKBUHSWB heat
generators (see "3.5 Installing optional
3 Make suitable connections on the RTX-EHS PCB of the
connection set (see " 3‒38 Connection on the RTX-EHS
PCB" [ 4 25]).
4 Fix cables that are fed into the connection set from the outside
using the strain relief clips and cable ties included (see steps 7
and 8 in "3.7.4 General information on the electrical
connection" [ 4 23]).
accessories" [ 4 18]).
Installation and operating manual
25