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Y Plan


Y Plan: A term introduced by Honeywell, but now used universally to refer to a domestic heating system consisting of a boiler, boiler pump, and a linked radiator circuit and cylinder circuit. In a Y plan system the radiator and cylinder circuits are controlled by a two channel time clock, a cylinder thermostat, an optional room thermostat and a three port zone valve. The three port valve is of the mid position type, having four electrical connections plus Earth.

 
See Also:Twelve-way Terminal Strip
 Two Port Zone Valve
 Three Port Valve
 Motorised Valve
 Mid-position valve
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