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Installation & Servicing instructions ATAG iS-Range
18
9.6 External DHW cylinder
ATAG 3-port external diverter valve kit including the ONE controller (CT500111) used with a vented
hot water cylinder.
The ATAG 3-port diverter valve is to be fitted external to the boiler on the system pipework with the electrical
wiring routed back to the wiring loom diverter valve connection within the iS boiler with a connection plug and
wire included with in the 3-port diverter valve kit.
The installation will use the cylinder sensor supplied within the 3-port diverter valve kit to control the hot
water temperature. Therefore no other cylinder thermostat is required.
The ONE controller will control the heating and hot water time and temperature requirements.
The weather compensation for heating will be controlled by the boiler and ONE controller via the internet
connection and postal code weather data. An optional outside sensor (ARZ0055U) can be added to the
3-port diverter valve kit to sense the outside temperature specifically for the individual property.
Fitting the cylinder temperature sensor
The cylinder sensor may be fitted into a sensor pocket if available, please refer to the cylinder manufactures
instructions. If there is no sensor pocket, as found with foam covered cylinders then the following steps
should be followed.
1. Mark a rectangular section of approximately 50mm (w) x 100mm (h) about one third of the cylinder height
up from the bottom of the cylinder.
Caution: Cut carefully. Do not pierce the wall of the cylinder or cut away any metal insulation outer
casing.
2. Using a sharp knife, carefully cut through the insulation, remove and retain the piece of insulation.
3. Clear off any excess material from the surface of the cylinder to ensure the best contact.
4. Place the sensor in position on the cylinder body and hold in place with aluminium tape and where
available apply heat conductive paste.
5. Replace the previously removed insulation material
6. Secure the insulation in place with suitable tape or strapping.
Wiring of components
Connect the 3-port diverter valve 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
control wires with the blue connector to the blue BUS volt free position on the back of the control panel.
Figure 9.6.a