Wiring Centre
4
H/W
This output is used to control a hot water valve via a cylinder
thermostat
L = Live
E = Earth
N = Neutral
Gr = Grey
Or = Orange
The auxiliary wires of the valve, usually grey & orange, are wired to the
Gr & Or terminals.
Zones 1…4
Zones outputs are clearly marked
L = live out to actuator or valve
N = neutral to actuator or valve
There are two connections live (L) and neutral (N), both terminals
marked L are the same and both terminals marked N are the same.
Each zone output corresponds to the thermostat wired in at the
top of the pcb.
Connections
Mains Supply
Power supply into the UFH4ZW which should be fused at 5 amps these
connections are marked
L = live or phase 230v AC 50/60Hz
N = Neutral
E = Earth
Heat Enable
This is the main call for heat for the system, there are 3 connections;
LS = Live Supply
E = Earth
LR = Live Return
Electrically this is a volt free switch, whatever supply is placed on the
LS connection, is fed to the LR connection when there is a call for heat.
UFH4ZW Wiring
Summary of Contents for UFH4ZW
Page 1: ...Model UFH4ZW...
Page 11: ...11 Model UFH4ZW Notes...
