• The UH4 provides central switching of up to 4 zone actuators
• Output for a hot water cylinder and the system boiler and pump.
• UH4 Dimensions 384x148x60mm

At the same time the UH4 offers the ability to operate a boiler or other heat source through a volt free output. An additional output designed for use with underfloor heating systems, is also included as standard.

This is the pump/valve Output, which would normally operate a manifold pump or a manifold valve. The H/W output provides a 230v hot water enable signal to the valve, the auxiliary wires of the valve are wired to the Gr & Or terminals.

Zone 4 can be used as an isolated radiator zone by using the Yes/No switch. If the switch is set to NO; When zone 4 calls for heat this will provide an output to a radiator zone valve and the boiler but WILL NOT enable the underfloor heating pump/valve output.

If the switch is set to YES; When Zone 4 calls for heat, this will act as an underfloor heating zone, by enabling the actuator, boiler and pump/valve outputs. Any output which is not needed can be ignored.

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