Solution - Gas Boiler
Description
A compatible gas boiler can be controlled by the PIERRE system through its external heat-demand input.
The PIERRE system can provide the room temperature measurement and thermostat control using a PIERRE thermostat or a compatible temperature sensor. Based on the measured temperature and configured target temperature, the system generates the heating demand for the boiler.
A PIERRE Controller controls a relay whose potential-free contact is connected to the boiler's external heat-demand input. By opening or closing this contact, PIERRE can start or stop the heating demand.
The boiler remains responsible for its own internal operation and safety functions.
How the Control Works
-
The relay's COM and NO contacts are connected to the boiler's external heat-demand input.
-
The room temperature is measured by a PIERRE thermostat or compatible temperature sensor.
-
When heating is required, the PIERRE Controller activates the corresponding output.
-
The relay contact closes and sends the heating-demand signal to the boiler.
-
When heating demand is no longer required, the relay contact opens.
-
The boiler responds according to its own internal control logic.
PIERRE therefore provides the heating-demand signal to the boiler. It does not directly control the burner or the boiler's internal operating logic.
Temperature Regulation
The PIERRE system can provide the thermostat function for the heating system.
The configured target temperature and hysteresis determine when heating demand is activated and deactivated.
Temperature measurement can be provided by a compatible:
-
PIERRE thermostat,
-
PIERRE temperature sensor,
-
PIERRE temperature and humidity sensor.
This allows heating demand to be controlled according to the temperature of the required room or zone.
Automation and Scheduling
Heating demand can also be integrated into PIERRE Automations and schedules.
For example:
-
different target temperatures can be used at different times of day,
-
heating can operate according to a schedule,
-
heating demand can be removed when the target temperature is reached,
-
heating operation can depend on presence,
-
heating demand can be removed when a Window Contact detects an open window.
Technical Notes
-
The boiler must provide a compatible external heat-demand input that can be controlled by the PIERRE system.
-
Where the boiler requires a potential-free contact, an appropriate potential-free relay contact must be used.
-
The PIERRE system can provide the temperature measurement and thermostat control, so a separate room thermostat is not required for the PIERRE control logic.
-
The correct heat-demand terminals and required control method must always be verified in the boiler manufacturer's documentation.
-
Never apply an external voltage to an input designed exclusively for potential-free contact control.
-
Some boilers may have a factory-installed bridge on the external heat-demand terminals that must be removed when external control is connected.
-
The boiler's own flame supervision, temperature limits, fault handling and other factory safety functions must remain operational and must not be bypassed by PIERRE.
-
Installation and wiring must follow the applicable PIERRE wiring documentation, the boiler manufacturer's documentation and applicable electrical and gas installation requirements.
Schemes
Gas Boiler - Electric schemes
Cables
| Position | Wires | Diameter | Type | Comment |
|---|---|---|---|---|
| From PIERRE to PIERRE Mechanical Relay | 2 | 0.75 mm² | H07V-K | GND, OUT |
| From Mechanical Relay to Gas Boiler | 2 | 0.75 mm² | H07V-K | COM, NO |
FAQ
If the power goes out, smart devices will retain their last state and resume functionality when power is restored. For critical devices, battery backups can be used to maintain operation during an outage.
No, a classic thermostat is not necessary. Instead, a temperature sensor integrated with the PIERRE system can monitor the room’s temperature and manage the heating/cooling devices accordingly.
Yes, PIERRE offers its own smart thermostats, which can be found in the thermostat product category.
Yes, you can replace an old thermostat with a PIERRE display, as long as the display includes a temperature sensor for temperature monitoring.
Yes, most PIERRE displays have built-in temperature sensors and can control heating/cooling systems just like a thermostat. All displays have relays that can send signals to heating/cooling devices to turn them on or off.
Yes, you can control the temperature room by room.
The circulation pump’s operation is based on automation, so if the valve in any apartment’s floor heating system is activated, it simultaneously activates the circulation pump. If separate control is needed, it can only be handled locally within the apartment.
Each apartment measures its own temperature and humidity and controls the valves on its distribution manifold. The circulation pump of the floor (or of the building) is switched on by automation whenever any manifold valve on that floor is open, and off again when all valves are closed.
Yes, per manifold: an automation opens the valve when the room temperature drops below the set point and starts the pump once the valve is open (or after a short delay).
The heat pump can be controlled by PIERRE in two ways: • Potential-free contacts: one contact switches winter/summer mode, another starts and stops the heat pump. • Modbus RTU: consult the manufacturer or distributor in advance about the Modbus register addresses and documentation for the heat pump model.
The motorized valves for underfloor heating zones can be controlled without any issues by the PIERRE system, whether they are On-Off or 0-10V valves. In the mechanical room, the PIERRE system handles the following controls: winter-summer mode switching via a potential-free contact, circulation pump control, hot water circulation pump control, and 0-10V mixing valve control with supply water temperature measurement.
Most boilers have a room-thermostat input that expects a potential-free (dry) contact. Connect it to a relay output of the controller (NO and COM) and never apply voltage to it. Check the boiler manual: some thermostat inputs carry 230 V, others a low voltage — the relay must be rated for it.
