Where more than two zones of control are required, the PB4ZS RF is used with the PB22ZM RF 2 Zone Master Unit to provide up to 4 additional control zones. This unit provides wiring for up to 4 actuators per zone and 4 built in receivers. The master wiring centre enables simple wiring and RF switching of all common components in the system. Neon Indicators show the status of the connections. Room Temperature Controls In general an underfloor heating systems control setup will have - room thermostats, a master wiring centre, slave units, used for multiple room control, zone valve and actuators. Polyplumb Manifolds and Controls are common to all Polyplumb underfloor heating systems, independent of the floor application.

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