Atag BC100124, Appliance Technical Manual

Page: 28 / 36

ATAG 3-port external diverter valve kit
and ONE controller kit - CT500111 or CT500112
(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.
The cylinder sensor will be connected to the yellow
connector of the DHW volt free position and the ONE
control wires with the blue connector to the blue BUS volt
free position on the back 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.
28