Connecting An External Heat Generator - Daikin Altherma 3 H HT ECH2 O Referenzhandbuch Für Den Monteur

3.7.9

Connecting an external heat generator

INFORMATION
To connect an external heat generator, the connection set
for external heat generators must be installed (see
Chap. 3.5).
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 con-
nected to the indoor unit. To connect an external heat generator, the
connection set for external heat generators must be installed (see
Chap. 3.5).
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 fol-
lowing options:
▪ unpressurised via the connections (solar inflow and solar re-
turn flow) of the hot water storage tank
▪ for ...bivalent indoor unit device types, via the integrated
pressurised solar heat exchanger.
▪ Comply with the instructions on hydraulic connections (see
Chap. 1.2)
▪ Examples of the hydraulic connection (see
The external heat generator request is connected on PCB RTX-EHS
(see Fig. 3-41) via a relay. Electrical connection to the indoor unit is
possible as follows:
▪ External heat generator has a potential-free switching contact con-
nection 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 con-
nects the external heat generator (EKBUxx) for domestic hot
water preparation.
or
▪ Connection to AUX connection A (see
▪ 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 ETS(X/H)(B)-D
Heat pump (indoor unit) with integrated heat accumulator
008.1447299_00 – 06/2019 – EN
Chap. 9.5).
Chap. 3.7.13)
3
Fig. 3-41 Connection on the RTX-EHS printed circuit board
1 Refer to the external heat generator's respective installation in-
structions for a suitable electrical connection.
2 Installing the connection set for external heat generators (see
Chap. 3.5).
3 Make suitable connections on the RTX-EHS PCB of the connec-
tion set (see Fig. 3-41).
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 Chap. 3.7.4).
Set-up and installation
Installer reference guide
25