SECTION 8
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The HIU features
Page 14
All features and functions can be accessed in the installer level programming. How to access, and a list of all the parameters which can be
programmed are in a separate document that is not to be left with the end user as misuse of these set parameters my cause the HIU to not
operate as efficiently as commissioned.
Refer to the Installer Controller Parameter Settings Guide, available from Inta or the supplier request.
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Language options.
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UFH or Radiator Heating.
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UFH floor drying (slab drying)*
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Minimum temperature limiting (HTG and DHW)
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Maximum temperature limiting (HTG and DHW)
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Optimised heating (uses less heat as the temperature
nears the set point)
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Flow limiting in HTG mode, full power as used for
DHW not required for lesser heating loads).
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Temperature control of primary return when in keep
warm mode.
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Frost protection.
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PWM pump control.
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Manual switching of the pump.
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Option to temperature control and additional hot water
storage cylinder.
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Option to switch a second pump to load the cylinder.
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Keep warm function switch ON or OFF.
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Option to redirect the keep warm bypass through the
heating PHE to prevent scaling of the DHW PHE.
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Anti
-
Legionella pasteurisation temperature and timed
function.
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Prepayment operation and shutting down of the HIU
when out of credit.
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Manual mode for the PICV actuator.
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Manual mode for the diverter valve.
•
Room thermostat switching options for normally open or
normally closed switching.
Features available in the HIU Controller
Check the temperature sensors are clipped securely to the pipes for accu-
rate control. All the sensors are colour coded for ease of identification.
RED = Primary FLOW
BLUE = Primary RETURN
ORANGE = Hot Water OUT
WHITE = Heating FLOW
GREY = Heating RETURN
The
C
ontroller Programming Guide
is only for the use of the installer or commissioning engineer, and under no
circumstances should be left with the user or home owner. Incorrect parameter programming may result in inefficient
performance or error code diagnostics which prevent the HIU operating as required.
06/21 E&OE
*SLAB DRYING
(first time of applying heat to the screed/floor).
Select YES
to initiate the floor drying for a new UFH system
Drying starts at the minimum temperature (25°C as factory set) for 3 days then rises to the maximum factory set
temperature (40°C as factory set) for 4 days => 7 days total. These minimum and maximum temperatures can be
reset respectively with parameter 03 and parameter 12 in the installer menu. The screen shows the time left for
this operation. The function can be stopped by pressing the OFF button.
Programming the HIU Controller.
Any changes to the factory settings should be carried out during commissioning. Details of programming parameters are to be
found in the
C
ontroller Programming Guide.
Contact Inta to request the Controller Programming Guide.
This document is not to be left with the HIU or the occupier of the home!
This document is available on request from your Inta Specification manager involved with this installation project.
Alternately contact by;
Inta website https://intatec.co.uk/contact
-
us/
Phone 01889 272181 ask for HIU Technical Support or HIU Service Desk.
