3
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Operation
FA ROTEX RoCon mb • 09/2017
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3.6.8 Heating support
If the heating support function (parameter [HZU] = On) is acti-
vated, the energy in the ROTEX HPSU monobloc compact's in-
tegrated storage tank is used to undertake the heating function.
At a sufficiently high storage tank temperature, the heat pump
(refrigerant circuit) remains deactivated.
The minimum value (T
HZUmin
) is calculated as follows:
T
HZUmin
= currently active hot water target temperature [T-DHW
Setpoint] + [TDiff-DHW CH Support] parameter.
Switch-on condition:
Tdhw > T
HZUmin
+ 4 K
and
Tdhw > [T-HS Setpoint] info pa-
r 1 K
If the switch-on condition is fulfilled, heat is taken from the
storage tank and this is used to supply the heating system.
Switch-off condition:
Tdhw < T
HZUmin
or
Tdhw < [T-HS Setpoint] info parameter (see
chap. 3.6.4)
If the switch-off condition is met, heating support from the hot
water storage tank is ceased, and the heat pump takes over
heating operation.
The [Power BIV] parameter limits the maximum power that can
be removed. The [T vbh1 max] parameter limits the maximum
temperature that can enter the heating system.
Detailed explanations and possible setting values of this function can be found in
chap. 6.2.2.
3.6.9 Special function: switching contacts
By setting the [AUX Fct] parameter, the switching conditions for
the potential-free AUX switching contact (toggle switch output A).
This switching contact can be used to control an external heat
generator, for example.
If one of the switching conditions is fulfilled, the potential-free
switching contact is switched after the time set in the [AUX time]
parameter.
AUX switching contact
(toggle switch output
A
) is
not switched
if setting =
0: function deactivated.
AUX switching contact
(toggle switch output
A
)
is switched
if
setting =
1: if storage tank temperature (Tdhw)
≥
value of parameter
[T-DHW 1 min].
2: if a cooling request or heating request is present.
3: if a hot water request to the backup heater (BUxx) is pre-
sent or the configured backup heater is requested for heating
support.
4: if an error is pending.
5: if the sensor value (TVBH) is > 60 °C.
6: if the outside temperature is < parameter value [Equilibrium
Temp].
Heat pump continues to operate = parallel bi-valence
mode.
7: if the outside temperature is < parameter value [Equilibrium
Temp] + a heating request or a hot water request is present.
Heat pump does not continue to operate = alternative bi-
valence mode.
8: if a hot water request is present.
9: if the outside temperature is < parameter value [Equilibrium
Temp] + heat request "room heating" (not for hot water
request). Heat pump no longer operates in room heating
mode below the value set in the parameter [Equilibrium
Temp] - only in hot water mode.
Application: alternative room heating bi-valence mode if the
boiler is hydraulically integrated so that it directly heats the
unpressurised storage tank water of the ROTEX HPSU
monobloc compact (connection via solar connections).
10: "multi-oil" - if the outside temperature is < parameter value
[Equilibrium Temp] + heat request "room heating" (not for hot
water request). Heat pump no longer operates in room heat-
ing mode below the value set in the parameter [Equilibrium
Temp] - only in hot water mode.
Application: alternative room heating bi-valence mode if the
boiler is hydraulically integrated in the heat pump feed. For
this application type, the frost protection function must be
deactivated on the ROTEX HPSU monobloc compact
(parameter [T-Frost Protect] = Off).
11: if the heat pump is in "Cooling" operating mode.
Detailed explanations and possible setting values of this function can be found in
chap. 6.2.2.
3.6.10 Air purge
By activating the air purge, the RoCon mb controller starts a per-
manently defined sequence program with start/stop operation of
the integrated heating circulation pump and various settings of
the 3-way switch valves integrated in the ROTEX HPSU
monobloc compact.
Any air present can escape via the automatic vent valve during
the air purge and the hydraulic circuit connected to the ROTEX
HPSU monobloc compact is evacuated.
1. Enter the technician code (see chap. 3.6.1).
After entering, the
"Setup"
level is displayed.
2. Use the rotary button to select the [
Air Purge
] parameter.
3. Confirm the selection with a brief push of the rotary button.
The setting of the parameter is displayed.
4. Use the rotary button to set the parameter for the function to
"On"
, and confirm by pressing the rotary button briefly.
"Air Purge"
starts (3-way switch valves move to the middle
position, the heating circulation pump modulates - see
fig. 3-17).
After the program has ended (approx. 10 min), the
ROTEX HPSU monobloc compact is switched to
"Standby" operating mode.
With this option, frost protection must take place via
the boiler.
The activation of this function does not replace correct
venting of the heating circuit.
The heating circuit must be completely full before acti-
vating this function.
