Wiring Center /24V
FHB8R3-24V · ThermoB Zone series
For underfloor heating with up to 8 zones (4+4) – a separate temperature in every room, heating and cooling. Wired wiring center, 3 relay outputs, 24V AC/DC power supply.
Why it matters
- Wiring center for up to 8 wired zone / rooms / thermostats
- Logically divided into 2 x 4 zones "A" and "B" or 8 general zones
- Combines commands for underfloor heating and fan coil units
Product info
- • Wiring center for up to 8 wired zone / rooms / thermostats
- • Logically divided into 2 x 4 zones "A" and "B" or 8 general zones
- • Combines commands for underfloor heating and fan coil units
- • 3x Controlled outputs with application defined function
- • 4x selectable functional diagrams
- • 2x Expansion inputs, "A" and "B" sections
- • 1x Heat/Cool switchover input
- • Selectable delay at switch on - 3 min (short) / 15 min (long)
- • Selectable hold time after switch off - 1 min (short) / 5 min (long)
- • Selectable anti-seize function for pump(s)
- • DIP switch, 6 positions for system configuration
- • 24V AC/DC power supply
- • Note: an improved version of this module is planned, where the relay output command polarity will be invertible via a jumper. Older units (manufactured before July 2026) do NOT have this feature.
Zones/rooms
8 common or 4 underfloor + 4 fan coil
Terminals
Spring terminal blocks (crewless terminal) for quick installation and reliable contact
Relay outputs
3pcs, voltage free, 5A/230V rated
Power supply
24V AC/DC
Dimensions
110x235x50 mm
Own power consumption
1.5VA + 0.25VA per activated circuit; max.
Operating conditions
-25 to 45°C, RH80%; storage and transport -25/+60°C
Mounting
DIN rail 35mm; or panel-mount, flush
Functional diagrams
4, selectable via SW1
Choose your application
8 zones: 1–4 underfloor, 5–8 fan coils · boiler, heat pump or boiler + chiller. · 7 schemes · click a tile for the wiring diagram
Applications and compatibility
Works together with
Suitable for
- Who it is for
- HomeInstallers
- Applications and systems
- Underfloor heatingFan coil systemsHeat pumpMulti-zone heatingunderfloor + convector
- Building types
- HouseVilla