This unit plugs in to the Single Zone Master Unit PB1ZM and provides simple wiring of actuators and room thermostats for multiple zone control. Neon indicators show room activation. This unit provides up to 4 additional control zones. Up to 4 actuators can be connected per zone. It can also be plugged into another PB4ZS and PB1ZM combination to provide up to 8 additional control zones. Polyplumb Manifolds and Controls are common to all Polyplumb underfloor heating systems, independent of the floor application. 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. Slave units are always used in conjunction with a master control unit and provide extended wiring of extra actuators and room thermostats for multiple zone control. Neon indicators show room activation. The 4 and 6 zone slave units  must be used in conjunction with a Single

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