Daikin EKHWMXB500CA [23/64] X operation
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Daikin EKHWMXB500CA [23/64] X operation

Daikin EKHWMXB500CA [23/64] X operation
3 x Operation
Daikin Control unit
RoCon mb
008.1446899_00 – 07/2019 – EN
Operating instructions
23
The cooling slope is defined through the four following param-
eters:
1. [Start T-Out Cooling]
2. [Max T-Out Cooling]
3. [T-Flow Cooling start]
4. [T-Flow Cooling max]
During weather-dependent T-HS control, the user can increase
or decrease the target feed temperature by a maximum of 5 K
with the parameter [Cooling Setpoint adj]. A temperature re-
duction is limited by the parameter [Min T-Flow Cooling].
1 Parameter [Start T-Out Cooling]
2 Parameter [Max T-Out Cooling]
3 Parameter [T-Flow Cooling start]
4 Parameter [T-Flow Cooling max]
5 Parameter [Min T-Flow Cooling]
6 Target room temperature
7 Cooling mode possible
T
A
Outside temperature
T
V
T-HS
― Cooling slope
--- Possible parallel cool-
ing slope shift
Fig. 3-16 Cooling slope parameter dependency
Detailed explanations and possible setting values of this function can be found in
chap. 6.2.3.
If the mean outside temperature falls below 4 °C when
"Cooling" operating mode is active, the operating mode
automatically switches to "Heating".
Renewed automatic operating mode switching to "Cooling" only
takes place:
– if a room thermostat is connected to plug connection J16
(cooling
) and
– the room thermostat's switching contact is closed and
– the mean outside temperature increases to over 10 °C
again.
3.6.4 Weather-dependent T-HS control
When weather-dependent T-HS control is active, the target feed
temperature (see info parameter [T-HS Setpoint], chap. 6.10) is
automatically determined according to the set heat/cooling slope
depending on the outside temperature.
This function is activated in delivery condition. It can only be
deactivated (fixed value control) or reactivated with a technician
code.
With the optional EKRSC1 outside temperature sensor that is in-
stalled on the north side of the building, weather-dependent T-HS
control can be further optimised. If no EKRSC1 is installed, the
RoCon mb controller uses the outside temperature value
measured at the heat pump outdoor unit.
If the room station (EHS157034) is additionally connected to the
Daikin Altherma M ECH
2
O, the target feed temperatures are con-
trolled depending on the weather and room temperature (see
tab. 6-3 / tab. 6-16, parameter [Room Influence]).
The activation or deactivation of this function is takes place via
the [HC Function] parameter in the "Configuration"
rotary
switch setting at the "HC Configuration" level.
– [HC Function] parameter = 0: Weather-dependent T-HS con-
trol
– Parameter [HC Function] = 1: control according to fixed target
feed temperature
– For heating mode: parameter [T-Flow Day] or parameter
[T-Flow Night]
– For cooling mode: parameter [T-Flow Cooling]
Weather-dependent T-HS control has no influence on
the target feed temperature in the case of a hot water
circuit request.
With connected mixer module
Setting of the heat/cooling slopes and the activation of weather-
dependent T-HS control for the assigned heating circuit are
carried out in the same way as described above.
The assigned heating circuit can be operated as a:
a)
Mixer add-on
The outside temperature of the outside temperature sensor
connected to the Daikin Altherma M ECH
2
O is transmitted to
the mixer module via the CAN bus.
or as a
b)
Mixer add-on with zone control
A separate outside temperature sensor must be connected
(EKRSC1) to the mixer module. The assigned heating circuit
is controlled according to the outside temperature relevant to
this zone.
With activated terminal function, the mixer module can be op-
erated and the settings for the assigned heating circuit under-
taken via the RoCon B1 control panel of the Daikin Altherma M
ECH
2
O.
In combination with the EHS157034 room station, the mixer
module can also control the assigned heating circuit completely
independently and irrespective of the Daikin Altherma M ECH
2
O.
If, in the rotary switch position, the message
"n.A." is displayed, no valid terminal address has been
assigned to the control unit yet.
If the "n.A." message is still displayed, it may be necessary to
update the device software in order to use the terminal function.
Contact the Daikin Service Team for this.
More detailed explanations and possible setting values for this function can be
found in chapters 6.2.3 and 6.13.2.
3.6.5 Frost protection function
The integrated heating circulation pump is switched on at an
outside temperature below the [T-Frost Protect] parameter value
in order to prevent the heating system from freezing.
In addition, the flow, storage and connected room temperature
sensors are also constantly monitored. If the measured temper-
ature at one of these sensors falls to less than 7 °C (less than
5 °C at room temperature), the antifreeze function is also acti-
vated.
If the antifreeze function is active, the display of the RoCon mb
control unit displays the
symbol next to the time on the
standard display.
If the heating feed temperature falls below 7 °C, the Daikin
Altherma M ECH
2
O heats until the heating feed temperature
reaches at least 12 °C.

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