4
Set-up and installation
Installation and maintenance instructions
25
Daikin Altherma EHS(X/H)
Daikin Altherma integrated solar unit
008.1444099_00 – 07/2018 – EN
4.7.6
Connecting the outside temperature
sensor (optional)
The heat pump outdoor unit has an integrated outdoor temperature
sensor which is used for weather-compensated inflow temperature
control with frost protection function. The weather-compensated in-
flow temperature control can be further optimised with the optional
outdoor temperature sensor.
▪ Choose a location at about one third of the building height (min-
imum distance from floor: 2 m) at the coldest side of the building
(North or North-East). Ensure that the location is not near to any
external heat sources (flues, air ducts), nor subject to direct solar
radiation.
▪ Place external temperature sensors in such a way that the cable
exit points face downwards (prevents humidity ingress).
CAUTION
Laying the sensor and mains lines in parallel in a wiring
conduit can lead to major malfunctions during controlled
operation of the Daikin Altherma EHS(X/H).
▪ Always lay the sensor line separately.
1
Connect the exterior temperature sensor to a twin-core sensor
line (minimum diameter
1 mm
2
).
2
Install the sensor line to the Daikin Altherma EHS(X/H).
3
Follow the installation steps in
4
Connect the sensor line to the XTA1 terminal strip (see
).
5
On the RoCon+ HP controller, set the [External temperature
sensor] parameter to "On" [→ Main menu → Configuration
→ Sensors].
4.7.7
External switching contact
Connection of an external switching contact (
changeover of the operating mode on the Daikin Altherma EHS(X/
H).
The current operating mode is switched by a changing resistance
value (
). The changeover of the operating mode is only ef-
fective for a long as the external switching contact is closed.
The operating mode has an effect on the direct circuit of the Daikin
Altherma EHS(X/H) as well as all other heating circuits connected to
this device as an option.
When special functions (e.g. "48h Emergency Operation") are activ-
ated, the input is not evaluated.
Fig. 4-36
EXT switching contact connection
Operating mode
Resistance RV
Tolerance
Standby
< 680 Ω
± 5%
Heating
1200 Ω
Reducing
1800 Ω
Summer
2700 Ω
Automatic 1
4700 Ω
Automatic 2
8200 Ω
Tab. 4-6
Resistance values for evaluating the EXT signal
INFORMATION
The input is not considered for resistance values greater
than the value for "Automatic 2".
INFORMATION
The [Heating support (HZU)] function integrated in the Ro-
Con+ HP controller (see the Controller operating instruc-
tions) makes it unnecessary to connect the connection to
the burner blocking contact connection of the solar system.
4.7.8
EBA (external requirement request)
By connecting the EBA switching contact to the Daikin Altherma
EHS(X/H) (
) and corresponding parametrisation in its Ro-
Con+ HP controller, an external switching contact can be used to
generate a heat request. If the switching contact is closed, the Daikin
Altherma EHS(X/H) switches to heating mode. The inflow temperat-
ure is controlled to the temperature set in the [Inflow temperature
heating operation] parameter [→ Main menu → Configuration
→ Heating].
The EBA switching contact has priority over a request from the room
thermostat.
The switching contact is not evaluated in cooling mode, standby,
manual or summer mode. The heating limits are also ignored.
Fig. 4-37
EBA switching contact connection
4.7.9
Connecting an external heat generator
INFORMATION
To connect an external heat generator, the connection set
for external heat generators must be installed. (see
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 Daikin Altherma EHS(X/H). To connect an external
heat generator, the connection set for external heat generators must
be installed (see
The heat supplied by the external heat generator must be fed to the
unpressurised storage tank water in the Daikin Altherma EHS(X/H)
's hot water storage tank.
▪ Implement the hydraulic connection according to one of the two
following options:
