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Connecting a boiler (optional)
The controller includes a boiler relay that can be used to
send a signal to either fire the heat source or to open a
two-port motorized zone valve positioned on the flow to
the underfloor heating manifold. If the relay is used to open
a zone valve, the dry contact on the zone valve should
be used to fire the heat source.
Alternatively, the boiler relay can be used to send a demand
signal to the water temperature controller. The additional
contacts on the water temperature controller should then be
used to fire the heat source.
The boiler can be connected either on the base unit or by
using a wireless relay module.
Connecting a boiler to the base unit
The illustration below shows how to connect a boiler to
the base unit.
BOILER
BOILER
Figure 3-14: Connecting a boiler to the base unit
Important! This connection requires a dry contact
sensing input in the boiler.
1. Study the wiring diagram in the end of the manual or inside
the cover of the base unit to locate the connector positions.
2. Ensure power is disconnected from both the base unit
and the boiler.
3. Remove the screw and open the cover for the optional
connections compartment.
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4. Route the wires from/to the boiler via a cable entry.
5. Connect the boiler to the connection labeled BOILER.
Important! There is no power in the base unit to
supply the boiler. The boiler connector in the controller
provides only a dry contact to switch on and off the
power connection to the boiler.
Connecting the base unit to AC power
Refer to the instructions below to conclude the installation
of the base unit.
1. Check that all wiring is complete and correct.
• Actuators
• Heating device
• Circulation pump
2. Ensure the 24 VAC compartment of the base unit is
closed and the fixing screw is tightened.
3. Connect the power cable to a 24 VAC, 50 VA transformer
as required by local codes.
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Troubleshooting
