FAQ Sheet
V4043 Zone Valve (S Plan) Operation
Pipework Schematic
Use V4043H zone valves if ‘Zoning’ a heating system with multiple heating and/or hot water circuits.
Pump flow
Mechanical Operation
V4043B (Normally OPEN valve)
V4043C/H (Normally CLOSED valve)
240V on brown wire will close valve
No Auxiliary End Switch. No Manual Lever.
With no power, valve will spring open.
240V on brown wire will open valve.
When valve is fully open Aux. End Switch makes.
With no power, valve will spring close.
Replacement motor only = 40002737-003. Valve bodies are NOT interchangeable.
Please Note:
Manual Lever on the side of the normally closed valves will hold valve open, but it is not designed to switch
the End Switch, neither is it a position indicator.
Electrical Operation
A 240V supply between the brown and blue wires will energise the motor and operate the valve. Removal
of power will return the valve to its original position. If using the valve in an application where the auxiliary
switch is not needed, isolate and make safe the orange, grey (& white) wires.
The auxiliary switch is electrically isolated from the valve motor. When the V4043H zone valve is motored
fully open, the orange wire contact makes to the grey wire contact. On the C & S Plan systems, this would
provide power to the boiler & pump. The V4043H Zone Valve can be used to operate a Combination or
System Boiler that requires volt-free switching, by connecting the orange and grey wires directly to the
switching terminals on the boiler (See boiler instructions for specific wiring details).
Auxiliary Switch Operation
L
BR
G
W**
* = Auxiliary switch is not fitted to V4043B valves
** = White wire is only fitted to the 28mm and 1” BSP Zone Valves. It is also fitted
to the zone valve replacement powerhead, part no: 40003916-001.
O
The white wire is only used on the ‘C Plan’ Gravity HW systems. If wiring to a fully
pumped system, isolate & make safe the white wire.
M
B
Auxiliary switch *
E
Valve must be earthed
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O = Orange wire - common contact
G = Grey wire - normally open contact
W = White wire - normally closed contact
BR = Brown wire
B = Blue wire
L = Live wire
EN1H-2475 UK01 R0908