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4
x
Set-up and installation
Fig. 4-35 Connection of EXT switching contact
Operating mode
Standby
Heating
Reducing
Summer
Automatic 1
Automatic 2
Tab. 4-1 Resistance values for evaluating the EXT signal
The input is not considered for resistance values
greater than the value for "Automatic 2".
INFORMATION FOR CONNECTION OF A DAIKIN
SOLAR SYSTEM
The [HZU] function integrated in the RoCon mb controller (see
the operating instructions for the controller) makes it unneces-
sary to connect the EXT connection to the burner blocking con-
tact connection of the Daikin solar system.
4.5.8 External requirement request (EBA)
By connecting the EBA switching contact to the Daikin Altherma
M ECH
O (fig. 4-36) and corresponding parameterisation in its
2
RoCon mb controller, an external switching contact can be used
to generate a heat request. If the switching contact is closed, the
Daikin Altherma M ECH
O switches to heating mode. The feed
2
temperature is regulated to the temperature set in the parameter
[T-Flow Day].
The EBA switching contact has priority over a request from the
room thermostat.
The switching contact is not evaluated in cooling mode, Stand-
by, manual or summer mode. The heating limits are also ignored.
Fig. 4-36 Connection of EBA switching contact
Installation and maintenance instructions
26
Resistance R
Tolerance
V
< 680 Ω
1200 Ω
1800 Ω
± 5 %
2700 Ω
4700 Ω
8200 Ω
4.5.9 Connecting an external heat generator
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 Daikin Altherma M ECH
The heat supplied by the external heat generator must be fed to
the unpressurised storage tank water in the Daikin Altherma M
ECH
O's hot water storage tank.
2
● Implement the hydraulic connection according to one of the
two following options:
a)
unpressurised via the connections (solar feed and
solar return) of the hot water storage tank
or
b)
in the case of Daikin EKHWMXB... device types, via
the integrated pressurised solar system heat exchanger.
– Observe notes on hydraulic connections (see chap. 2.4)
– Examples of hydraulic connection (see chapter 9).
The external heat generator request is connected via a relay on
printed circuit board RTX-EHS (see fig. 4-37). Electrical connec-
tion to the Daikin Altherma M ECH
a) External heat generator has a potential-free switching
contact connection for heat request:
– Connection to K3 if the external heat generator under-
takes hot water preparation and heating support (setting
of parameter [Function Heating Rod]=2)
or
– Connection to K1 and K3 if two external heat generators
are used (setting of parameter [Function Heating Rod]=3).
In this case, K1 connects the external heat generator (e.g.
gas- or oil-fired boiler) for heating support and K3 con-
nects the external heat generator (EKBUxx) for hot water
preparation.
or
– Connection to AUX connection A (see chap. 4.5.13)
b) 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 printed circuit board RTX-
EHS must not be used simultaneously for
connecting mains voltage (~230 V) and
SELV ("Safety Extra Low Voltage").
● Refer to the external heat generator's respective installation
instructions for a suitable electrical connection.
● Connect the external heat generator to the Daikin Altherma M
ECH
O (fig. 4-37).
2
Connection X1 is designed as a screw terminal.
O.
2
O is possible as follows;
2
Daikin Altherma M ECH
O
2
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
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