User Manual

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3.2.2 Sequence control module
Advantages:
– Demand-dependent changeover between heating and cooling mode.
– No simultaneous heating and cooling.
– Supports purge function for energy-efficient cycle operation.
The sequence control module controls valves and pumps for the heating and
cooling mixing circuit. This type of control was predestined for a hydraulics
topology that allows the zone to draw hot or cold water and control the flow
temperature via separate heating and cooling valves.
Control of the flow temperature to the preset flow temperature setpoint range
occurs using a sequence controller with two sequence elements (similar to supply
air control for ventilation plants).
The purge operation acts on the zone pump and valves: The zone pump is
switched on and the valves closed to allow for circulation of the heating/cooling
media within the zone. The purge mode is needed to acquire the concrete core
temperature after a switch-off phase and to determine the next heating or cooling
action.
3.2.3 Room temperature control mode
Advantages:
– High level of room comfort.
– Adjustment to the room temperature setpoint for heating and cooling curves for
additional comfort.
– No overheating or under-cooling.
– Separate switch on/off of room-temperature control to control heating and
cooling setpoints.
The module may be enabled as an option if TABS room-temperature control is
desired. Changes to the room temperature setpoint have a considerable lag due to
the high degree of thermal inertia of TABS. Corrections are usually only possible on
a day-to-day basis. The desired level of comfort is maintained by relying on one or
more representative room temperature measurements in the zone without causing
overheating or under-cooling.
Note:
Room temperature control is only possible where no auxiliary system assumes
control of the room temperature. For example, TABS room temperature control
must be switched off in rooms where auxiliary heating systems are available and
controlling the room temperature. Nevertheless, room temperature control can
continue to be used for cooling.