Heat Interface Units
(HIU
)
deliver heat generated from a centralised heating plant to multiple homes,
apartments or flats. The method is to combine plate heat exchangers with a control valve to enable the supply of
sufficient heat to provide hot water (DHWS) and room heating (HTG). The Hiper HIU has been developed to this
concept with unique control and ability to optimise performance and operation.
The Hiper HIU is all that is needed in the home to provide all its heating and hot water. It
’
s like a boiler without a
flame. The heat is provided by the
‘
communal
’
heating boiler or heat source.
Heat is transferred to the home requirement by two plate heat exchangers which have been designed to match
the intended output. One plate heat exchanger provides the hot water supply (DHWS) and the other plate heat
exchanger supplies a heating circuit (radiators or underfloor heating, the installer has the option to commission
for either).
The Hiper HIU has innovative design advantages, and is the result of many years experience, research and collab-
oration with specialised engineers. Its general classification is INDIRECT HIU as the two plate heat exchangers
provide a barrier between the secondary and primary heating circuits.
PROPORTIONAL interface with PRESSURE INDEPENDENT CONTROL
-
100% authority (regardless of pressure fluc-
tuations in the district heating supply) and interfaced with electronic PID (
Proportional
-
Integral
-
Derivative)
con-
trol. Performance is guaranteed even when apartment heating and DHW systems fluctuates The benefits are high
volume performance delivery of hot water for the end
-
user by enabling the use of larger area PHE (plate heat
exchangers) while maintaining very low return temperatures giving substantial energy savings.
PID Electronic Controller
(Proportional
-
Integral
-
Derivative)
-
with temperature and flow sensor input maintains the
efficiency of the HIU. Switches to priority DHW on demand and maintains stable
temperatures under varying load conditions. The PID logic is also different in that it is
dual speed, and reacts to demand by accelerating or decelerating response to achieve the
set point and stabilise it quickly.
Pressure Independent Control (PICV)
Integral PICV with electric actuator giving proportional modulating control as instructed
by the PID Controller, 100% authority, (regardless of pressure fluctuations in the district
heating supply). Unlike many other HIU, no further control valves are required.
Minimising scale build up.
In the DHW PHE
-
the flow is always diverted away from the DHW PHE into the HTG PHE
reducing the scale formation potential. Option—see ActivFlo Scale Protection
Automatic Fault Diagnostics
The control unit can identify faults to components within the HIU and issues an
identifying fault code on the screen. Once the fault or error has been rectified the control
unit automatically resets and resumes normal operation.
Heating Flow Limitation
-
decreasing the possibility of starving the DH circuit when
extreme demands are made on the entire network. For example in cold weather when a
large heating demand is made on the network the control unit does not allow 100%
opening on start up and prevents the
‘
over demand
’
causing disruptions. The value is
factory set but can be if advised changed in the installer settings.
SECTION 2
-
Description
SECTION 2
-
Description FEATURES
09/17 E & OE
Summary of Contents for Hiper Xi45 INDIRECT HIU 45DHW/10HTG
Page 28: ...09 17 E OE ...
