8
PRINCIPLES OF CONTROLLING
FLOOR HEATING SYSTEMS (FH)
ZONE CONTROL
1.0
1.4
The REHAU INTELLIGENT zone control system is a simple electronic
control system that has been specifically designed to
give optimum and accurate control of Floor Heating systems.
Heating/Cooling circuits are connected to a central manifold. Each circuit
will have a thermoelectric actuator (AC) on the manifold operating the
return valve for the circuit.
In heating mode:
The heat output in each room is controlled by a room sensor (RS), which
continuously compares the required room temperature with the actual
room temperature. If the room temperature is too low/high, it will signal
the actuator (AC) to open the return valve of the circuit and allow warm/
cold water to flow through it. (As shown in Fig. 5).
Zone controls give control over local/room temperature by adjusting the
amount of water circulating within individual circuits/ zones.
Adjustments are made dependent upon:
- Continuous temperature readings from each room sensor (RS)
- The end user settings such as room temperature set point and
programmed night set-back periods on the timer
In cooling mode:
The cooling output in each room is controlled by a room sensor
(RS), which continuously compares the required room temperature
with the actual room temperature. If the room temperature is too
high, it will signal the actuator (AC) to open the return valve of the
circuit and allow cool water to flow through it.
1.5 Set Back Mode
A floor heating system switches into set-back mode instead of
switching off completely. This means when you leave the house or at
night, the system allows the internal temperature to drop to a lower
level. Depending on the installed system components, this reduced
temperature level can be set for each room individually or for a group
of rooms.
The pre-set temperature for this mode should be carefully selected,
because if the temperature is set too low the system will require a large
initial input of energy coupled with a long response time to raise the
temperature again.
The set back mode enables the system to respond quickly and
efficiently when heat is required. It can also make it possible to
use a smaller boiler compared to a conventional heating system.
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