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2.0 Installation Instructions
Pre-installation
Please ensure that drain cocks are fitted to the relevant pipework prior to the HIU being fitted to facilitate any
necessary filling and draining functions.
All pipes connected to the HIU must be insulated to prevent any thermal transfer.
2.1 Installation
Please be aware that this HIU can be installed with the ball valves at the top or bottom, the template must
be positioned on the wall the correct way up to suit the installation.
Please ensure the HIU back plate is level before fully securing to the wall.
Using the template supplied in the packaging, mark the wall for the hole positions ensuring that the plate is
level and making sure there is enough clearance space above the HIU to allow for installation.
Drill the holes for the HIU with a suitable drill.
Secure the HIU to the wall using fixings suitable for the type of wall.
Check the ball valve connections then fit the respective pipework to the ball valves and tighten the
compression connections.
If a flushing bypass is to be used, this should be fitted to the primary flow & return ball valves before the
pipework is connected.
If the ball valves are to be installed at first fix before the HIU is fitted, an HIU should be used as a template to
work out the valve positions, then install as above.
If the ball valves have already been fitted, please ensure that the seals are fitted to the ball valve connections
before connecting to the HIU.
If the heat meter is installed, a bracket is supplied with the HIU for fitting the heat meter display to the top of
the HIU (bottom entry) or the bottom of the HIU (top entry) if required. Screws are supplied to fit the display
to the bracket and the bracket to the HIU.
