Heatmiser UH8RF 230V 8 Zone Wiring Centre

Heatmiser UH8RF 230V 8 Zone Wiring Centre

The UH8-RF V2 is an 8 Zone central wiring centre for use with Heatmiser RF thermostats. The UH8-RF V2 can be used to control any actuator or valve, which requires a 230v AC signal to open. For mid position valves and those requiring a closing signal, a changeover relay is required.

The UH8-RF V2 also offers the ability to operate a boiler or other heat source through a volt free output with changeover contacts, giving you both a heat on signal and a heat o signal. Additional outputs designed for use with hot water or underfloor heating systems, are also included as standard. These are the pump and valve outputs which would normally operate a manifold pump or a manifold valve. Any output which is not needed can be ignored.

When wiring directly to the heat source is not possible, a radio link is provided to remotely enable a separate receiver, the RF-Switch. Test switches are included for the installation engineer and further options include creepage protection and pump delay. Operation Using the toggle switches, each channel used on this system can be configured for either a radiator zone or underfloor heating zone. When the thermostat sends a signal for heating, the UH8-RF V2 will provide a 230v AC output on the paired zone and also bring on the boiler/other heat source output.

At the same time the UH8-RF V2 can send a radio signal to the RF-Switch. If the zone is configured as an underfloor heating zone, the UH8-RF V2 will also start the pump and valve outputs. If an enable signal is received from a hot water time clock on the system, only the H/W output will become active. This is a timed output, which is normally fed to a cylinder thermostat, then to a valve, but could also be used for towel rails. In either case the valve auxiliary switch would operate the boiler/other heat source. Other functions Creepage During hot weather the heating is not normally needed as often, this means that valves and pumps that are not being used can seize and refuse to operate. To prevent this, it is good practice to operate the valve or pump once a day, the creepage function does this for you.

Once enabled the UH8-RF V2 will operate each valve or pump for 1 minute, if the outputs have not been operated by a thermostat, within the preceding 24 hours. This function does not operate the boiler output. Pump Delay Some valves or actuators can take more than a minute to open, if the boiler and pump operate before the valve is open it can force a boiler to go to lockout and stop operating. This function delays the operation of the pump and boiler to give the actuators and valves time to open.