5
Heat meter installation
The HIU is designed to fit a compact heat meter (with incorporated
return probe) with 1” threaded connections and 130 mm gauge.
Before carrying out any maintenance, repair or part replacement
work, proceed as follows:
- cut off the electric supply
- remove the cover
- close the shut-off valves
- empty the HIU using the drain cocks provided
Proceed as described below to install the heat meter:
- remove the template (A)
- remove the cap (B)
- install the flow meter on the return pipe
- install the flow probe in the M10 pocket (B)
Please refer to the heat meter technical data sheets for further
information.
A
B
Hydraulic connections
Hydraulic connections to the centralised line must be implemented
using the manual shut-off valves supplied with the HIU, which allow
any necessary maintenance work to take place without having to
empty the centralised system.
It is advisable to install manual shut-off valves (not supplied) also
on the bottom connections to the apartment circuits.
Before installation, it is recommended to carry out accurate flushing
of all the pipes of the system in order to remove any residue or
impurities that could endanger correct operation of the HIU.
In order to facilitate these operations a manual bypass flushing
valve is available (code 789100).
N.B. Install the valves as shown in the figure
N.B.:
1 Install water hammer arresters to compensate for any overpressure in the domestic water circuit;
2 In the presence of hot water recirculation or if a non-return valve is fitted into the domestic cold water inlet, provision must be made to accomodate the expansion
of the water contained within the system and the heat interface unit;
3 All hydraulic connections must be checked before pressurising the system. Vibration during transport may cause the connections to become loose. DO NOT APPLY
EXCESSIVE TIGHTENING TORQUE otherwise the components may be damaged.
