What Control Valves might be used ?
The Controller will directly handle Honeywell V4073 Mid Position Valves (commonly and wrongly referred to as diverter valves, and sometimes described as three port valves) and equivalents – see diagram in Technical Information Section. These enable the water heated by the boiler to be directed either to hot water heating or to central heating, or to both together. Alternatively, separate ‘Two Port’ Valves (sometimes described as in-line valves) may be handled directly – such as the Honeywell V4043 and equivalents. Typically, one valve is then used to control hot water heating and another for central heating, but other arrangements may be configured for various purposes. Two-Port Valves are mandatory for most types of pressurised hot water systems and are normally best used when separately controlled zones are featured, when controlled towel rail heating is provided, and when underfloor heating is involved. In a typical arrangement, with one two-port valve controlling central heating an
