ATAG 3-port external diverter valve kit
including the ONE
ZONE
controller or Cube used with an unvented
hot water cylinder (iS System boiler only)
Unvented hot water cylinders
The installation may have altered wiring of the dual thermostat
(depending on the cylinder manufacturer) to only use the high
limit thermal cut-out of the dual thermostat.
The high limit thermal cut-out of the dual thermostat MUST be
wired to interrupt the power to the 2-port valve supplied with
the unvented cylinder.
Fitting of the cylinder temperature sensor
The cylinder sensor is to be fitted into a sensor pocket of the
unvented cylinder along with the dual thermostat supplied
with the unvented cylinder.
Wiring of components
The 3-port diverter valve will be connected to the spare 3-port
valve connector on the wiring loom.
Connect the cylinder sensor with the yellow connector to the
yellow DHW volt free position and the ONE Zone control or
Cube wires with the red connector to the red BUS volt free
position on the top front of the control panel.
2 port zone valve & dual thermostat (supplied with
unvented cylinder)
The 2-port zone valve must be installed in the primary flow
pipework between the 3-port valve and the cylinder connection
as per the following diagram and G3 unvented hot water
requirements.
The 230v mains power supply MUST be wired only to the
high limit thermal cut-out of the dual thermostat and be wired
to interrupt the power to the motor of the 2-port valve as per
electrical diagram below.
L
N
L
I
PE
N
PE
L
N
L’
230V out
230V Control
PE
N
L
230V i
n
N
L
230V out
L
N
L
I
3-PORT VALVE
230V
Connection 3 way valve
L:
Live
N: Neutral
L': Signal DHW
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