The DATA Extra HIU, Installation Instructions DE2, 12th August 2021
Stage 4 - Installing the Heat Meter
The HIU is supplied with or without the heat meter (as per specification), however in order to change the heat meter, it is necessary to
follow the procedure below:-
The heat meter body and temperature sensors are all wet pocket connections, therefore it is important to take the necessary
precautions against water spillage, when disconnecting any part of the heat meter.
The heat meter body and display cannot be disconnect from each other, neither should any cables or sensors be cut, as this will
invalidate the heat meter calibration and warranty.
1. Isolate the HIU, hydraulically and electrically.
2. Locate the heat meter measuring body and both temperature sensors. The hot sensors (red tag) should be mounted in the primary
flow pipe and the cold sensor (blue tag) should be mounted into the heat meter body itself.
3. Loosen and extract the heat meter sensor from the primary flow pipe.
4. If there is an MBus cable connecting to the heat meter, this will need to be disconnected from the incoming MBus cable.
5. Loosen the union nut either side of the heat meter body, and extract the heat meter body together with the sensors and heat meter
display.
6. Fit the new heat meter in the reverse order, using new sealing washers on both union connections.
7. Always check that the heat meter is fitted in the correct flow direction and that the sensors are fitted to the correct pipes. This can
be done using the heat meter reading.
Stage 5 - Programmer and Room Thermostat Connection
The unit can (optionally) be connected to a programmer / room thermostat, to control central heating timing and / or temperature.
Connect a
VOLT FREE
programmer / room thermostat (sold separately) across the orange Switched Live 'SL' terminals in the main
control box.
The room thermostat must be an on/off thermostat with potential free contacts. Thermostats that do not have a potential-free contact
must not be fitted..
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Содержание DATA Extra HIU
Страница 7: ...The DATA Extra HIU Installation Instructions DE2 12th August 2021 Dimensions Page 7...
Страница 15: ...The DATA Extra HIU Installation Instructions DE2 12th August 2021 HIU Schematic Page 15...
Страница 17: ...The DATA Extra HIU Installation Instructions DE2 12th August 2021 Wiring Schematic Page 17...
Страница 21: ...The DATA Extra HIU Installation Instructions DE2 12th August 2021 DHW Performance DHW Performance Table Page 21...
Страница 26: ...The DATA Extra HIU Installation Instructions DE2 12th August 2021 Secondary Flow Rate CH Pressure Drops Page 26...
Страница 29: ...The DATA Extra HIU Installation Instructions DE2 12th August 2021 Stage 3 Pipe Connections Page 29...
Страница 33: ...The DATA Extra HIU Installation Instructions DE2 12th August 2021 Page 33...
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Страница 40: ...The DATA Extra HIU Installation Instructions DE2 12th August 2021 Troubleshooting for Technicians Page 40...