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12.5
12.4.2 Activation of Cooling Functions
Special regulatory functions are performed when cooling
operation is activated. The cooling controller assumes these
cooling functions independently of the remaining regulatory
functions.
The cooling functions can fail to activate due to the following
reasons:
The external temperature is below 3 °C (danger of frost)
The external temperature for reversible air-to-water heat
pumps is below 15 °C
12.4.3 Deactivation of Circulating Pumps in Cooling Operation
In the case of a heat pump heating system with two heating
circuits, the heat circulating pump of heating circuits 1 or 2 can
be deactivated in cooling operation.
The heat circulating pump of heating circuit 1 (M14) is not active
in cooling operation if silent-only cooling is configured.
The heat circulating pump of heating circuit 2 (M15) is not active
in cooling operation if dynamic-only cooling is configured.
NOTE
The potential-free contact N17.2 / N04 / C4 / NC4 can be used to switch
heating components in heating or cooling operation (e.g. room
temperature controllers)
12.4.4 Silent and Dynamic Cooling
Different system configurations can be implemented according to
each integration diagram. Make selections in the menu item
"Settings – Cooling".
Dynamic-only cooling (e.g. fan convectors)
The fixed setpoint control determines the regulation. Set the
desired return flow set temperature in the "Settings" menu
item.
Silent-only cooling (e.g. underfloor heating, wall panel
heating or cooled ceilings)
The
room
temperature
Regulation is based on the temperature of the room where
the room climate control station 1 is connected according to
the circuit diagram. Set the desired room temperature in the
"Settings" menu item.
The maximum transferrable cooling capacity for silent
12.5 Regulation of the Room Temperature
Heating systems are normally equipped with an automatic
mechanism for separately regulating the room temperature in
each room.
The room thermostats measure the current temperature in
heating operation. If the current temperature undershoots the set
temperature, the thermostats activate the regulating device (e.g.
actuator).
EN-36
determines
the
regulation.
There is no cooling controller fitted or the connection is
broken
Neither silent nor dynamic cooling has been selected with
"Yes" in the settings
In all these cases, the cooling operating mode will remain active.
However, the regulation system responds as in the summer
operating mode.
Passive cooling
The cooling system can be supplied using either the existing heat
circulating pump (M13) or an additional cooling circulating pump
(M17).
NOTE
The cooling circulating pump (M17) operates continuously in "Cooling"
operating mode.
With passive cooling, the operating behaviour of the heat
circulating pump (M13) can, depending on the hydraulic
integration, be changed under Settings - Pump control.
cooling is heavily dependent on the relative humidity. High
humidity reduces the maximum cooling capacity, because
the flow temperature can not be lowered any further once
the calculated dew point has been reached.
Combination of dynamic and silent cooling
Regulation is carried out separately in two different control
circuits.
The dynamic circuit is regulated according to a fixed setpoint
(as described for dynamic cooling).
Silent cooling is regulated on the basis of the room
temperature (as described for silent cooling) by controlling
the mixer for heating circuit 2/3 (silent heating and cooling
circuit).
NOTE
If the cooler switches off because the minimum flow temperature of 7 °C
has been reached, then either the water flow rate must be increased or a
higher return flow set temperature must be set (e.g. 16 °C).
In cooling operation, the room thermostats must be either
deactivated or replaced with units which are suitable for both
heating and cooling.
The room thermostat responds inversely in cooling operation i.e.
if the set temperature exceeds the current temperature, the
regulating device is activated.
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