INPUTS: All inputs are 24Vac derived from the controller.

Outside air temp: Optimum start stop, Day economy, Compensation, Frost protection.

Compensator Flow sensor: Valve compensation, compensator low temp.

Boiler return sensor: Frost protection

Boiler flow sensor: One or two boiler control, Boiler compensation, Boiler high temp alarm and cut out,

Space sensors (2 MAX) Optimum start stop, Averaging, Day economy, Compensation,Frost protection.

OUTPUTS: All outputs are 230Vac derived from the controller

Boiler No1: Control output either direct or via a relay/contactor.

Boiler No2: as above.

Heating pump: As above

Valve open: To open terminal on 230v reversing actuator(Neutral required from controller)

Valve close: As above

Hot Water: Timed output

This product is Used and will have some marks on the front cover.

It has been tested and works correctly.

It is supplied with a copy of the manual.