INDIRECT & DIRECT HIU UNITS
INSTALLATION
24
LOGIC HIU
-
Installation & Servicing / Users
46 LOCATION OF HIU
The HIU must be installed on a flat and vertical wall, capable
of adequately supporting the weight of the boiler and any
ancillary equipment supplied in kit form by
Ideal Boilers
.
The
HIU must not be fitted outside.
The Logic HIUs are designed for installation in a sheltered
domestic environment (or similar), therefore cannot be
installed or used outdoors, i.e. in areas directly exposed
to atmospheric agents. Outdoor installation may cause
malfunctioning and hazards.
If the device is enclosed inside or between cabinets, sufficient
space must be provided for routine maintenance procedures.
It is recommended that electrical devices are NOT placed
underneath the HIU, as they may be damaged in the event
of discharge from the safety valve, if it is not connected to
a discharge tundish or in the event of leaks occurring at the
hydraulic fittings.
The device must not be exposed to water drops or humidity,
direct sunlight, the elements, heat sources or high intensity
electromagnetic fields.
In the event of a malfunction, fault or incorrect operation, the
device should be deactivated; contact a qualified technician
for assistance and Isolated from electrical and connection
feeds to the unit.
Note for all models:
If a non-return valve is fitted into the
domestic hot water (DHW cold water inlet), provison MUST be
made to accommodate the expansion of the DHW conatined
within the HIU.
Preparation
After establishing the position where the HIU will be installed,
perform the following operations:
• Mark the holes required for securing the HIU to the wall.
• Mark the position of the water pipe connections.
Check the measurements again before installing pipework and
electrical cables.
Fix the HIU to the wall.
N.B.: the wall anchors (not supplied) can only guarantee
effective support if inserted correctly (in accordance with good
technical practice) into walls built using solid or semi-solid
bricks. If working with walls built using perforated bricks or
blocks, mobile dividing panels or any masonry walls other than
those indicated, a preliminary static test must be carried out
on the support system.
Hydraulic connections
1 Connection to the pipework from the centralised boiler plant
2 Connect to heating circuit
3 Domestic water circuit connection
4 Connect safety relief valve to discharge pipework in
accordance to the local by laws
Electrical
1 Electric supply line 230 V (ac) - 50 Hz.
2 Time clock/thermostat line (potential-free)
3 Centralised bus line for heat meter data transmission
(if required)
4 Centralised electric supply line for heat meter (if required)
The whole system should be thoroughly flushed to remove any
debris that may be in the supply pipework to the HIU and to
the domestic hot water and heating pipework in the apartment
before connecting to the HIU.
47 ISOLATION VALVES
These units are supplied with all the necessary isolation valves
required for the unit. We recommend that all connections
are fitted with isolation valves to allow any maintenance
work to be carried out safely and effectively. We would also
recommend that the primary system is fitted with the optional
flushing bypass valves in addition to the primary isolation valve
supplied, immediately upstream of the HIU, to allow the primary
system to be flushed prior to the first operation of the unit.
48 ELECTRICAL CONNECTIONS
Make sure that the electrical system can withstand the
maximum power consumption of the appliance, with particular
emphasis on the cross-section of the cables.
If in doubt, contact a qualified technician to thoroughly check
the electrical system.
Electrical safety of the appliance is only achieved when
it is correctly connected to an effective earthing system,
constructed as specified in current safety regulations. This is a
compulsory safety requirement.
Connection to the main supply
The device is supplied with an electric supply cable - plug not supplied.
The device should be electrically connected to a 230 V (ac)
single phase + earth mains supply using the three-wire cable
marked with the label as specified below, observing the LIVE
(L) - NEUTRAL (N) polarities and the earth connection.
This line must be connected to a circuit breaker device.
Room thermostat
Electrical supply:
230 V (ac)±10% - 50 Hz
49 CONNECTION TO THE TIMELOCK/THERMOSTAT.
The Logic HIU includes a connection, suitable for a time clock/
thermostat, allowing the tenant to control individual apartment
heating requirements
The connection to this device
(potential-free contact)
must be made with the two-wire cable marked with the label
as specified below. Should it be necessary to extend this
cable, use one with the same cross-section (max 1 mm²) and
maximum length 30m.
Electrical supply: 230 V(ac) ±10% - 50 Hz
Label on HIU Thermostat connection
VOLT FREE ROOM
THERMOSTAT
CONNECTION
WARNING
DO NOT CONNECT EXTERNAL VOLTAGE
SUPPLY TO THESE TERMINALS
IMPORTANT: THIS
CONNECTION
MUST BE VOLT FREE
