Mend > Home Heating Systems

switchmaster mid valves?

how do i re wire the old switch master valve for a honeywell model. the old switchmaster valve has 6 wires and the honeywell only has five wires. will this valve work on my system or do i need a plumber to do this.

swampy
March 2005

Honeywell Heating, Home Heating Systems Mid Switch Valve

switchmaster 3port valve to honeywell

SwitchMaster(Blue{Neutral})-New Valve(Blue)
SwitchMaster(Green/Yellow{Earth})-New Valve(Green/Yellow)
SwitchMaster(Red{S/Live})-Link to Orange
SwitchMaster(Orange{HW On})-New Valve(Orange)
SwitchMaster(White{HW Off})-New Valve(Grey)
SwitchMaster(Yellow{CH On})-New Valve(White)

PETER
March 2009

SwitchMaster(Blue{Neutral})-New Valve(Blue)
SwitchMaster(Green/Yellow{Earth})-New Valve(Green/Yellow)
SwitchMaster(Red{S/Live})-Link to Orange
SwitchMaster(Orange{HW On})-New Valve(Orange)
SwitchMaster(White{HW Off})-New Valve(Grey)
SwitchMaster(Yellow{CH On})-New Valve(White)

The Red wire is now dropped on the more modern mid-position valves, you will find that this wire switched the boiler and pump on using the old switchmaster midi valve.

Instead now you need to connect the orange wire to the pump live and boiler live when wiring the new valve into the ten way.

Jonny Jones
December 2008

red and orange on switchmaster to orange on h/w yellow on s/m to white on h/w white on s/m to grey on h/w then neutrals and earths

d....m
April 2005

It is easy enough if you tell me what wires are on each valve on new valves there are always only five wires, blue, green ,white, grey and orange

Steve
March 2005