E-ITN 40
Manual for installation service and operation M2021/8a EN
1. INTRODUCTION
E-ITN 40 is modern electronic device intended for ratio based allocation of heat cost in buildings with central
heating system. The heat cost allocator E-ITN 40 uses the two-sensor measuring principle – integrates
temperature difference between sensor of radiator surface temperature and sensor of surrounding
temperature. Using this principle, allocator ensures measurement of consumption value only when the
radiator really emits heat. Compared to one-sensor allocator it minimizes the risk of summer consumption.
E-ITN 40 is intended to be installed in one-tube horizontal/vertical and two-tube heating systems with the
lowest mean design heating medium temperature ≥ 35 °C and highest mean design heating medium
temperature ≤ 105 °C.
Each radiator in billing (account) unit with common invoicing heat meter must be equipped with a heat cost
allocator of the same type. Technical conditions of heating system must be fulfilled when using heat cost
allocators E-ITN 40.
E-ITN 40 is not intended for heat cost allocation for floor heating systems, ceiling radiant heating, flap
controlled radiators, radiators with fan, systems with steam heating medium, air heaters and single tube
radiators if exceeds the scope of one user. It must not be also used for heating elements that shape and
design does not allow reliable transfer of heat to heat cost allocators.
1.1. LC DISPLAY
Basic allocator status and measured values can be displayed on LCD. LCD can display five alphanumeric
characters. These values are highlighted by underline and over-line, e.g. oPEn.
Meaning of some values may be different if the additional symbol „SM“ at the right bottom corner is
displayed. These values are mentioned with „SM“ symbol in text , e.g. 385 SM.
The last symbol on the display indicate end of the battery life, see chapter 4.3.2.
To save the battery, after longer period of inactivity (approx. 30 sec.), energy-saving mode is activated and
display is switched off. Display can be activated by pushing the button. (Illustration 1:LC Display).
When pushing the button briefly, notice ----- on the display will appear. If the button is not pushed in 30
seconds, the display will switch off.
The data displayed on the LCD display may vary depending on the type of the allocator and also on the
active operating mode. For more information, see below.
2. DEVICE DESCRIPTION
Installation of allocator consists only from mounting of base plate from aluminium alloy and placing of
allocator to this base plate. Due to integrated radio transmitter, presence of flat occupant is not required
when data are read. No strangers also enter the flat. Data reading can be made by billing company
employee using mobile receiving unit RFU 40 outside the house.
Measured data are transmitted in a short ~ 5-22 ms radio telegrams and secured by encryption. Data are
transmitted based on customer's settings.
Possible modes of transmission are:
• Beacon (It is transmitted serial number of allocator, seals states, date of connecting of external
sensor. Consumption is not transmitted.)
• Metra
• W-MBus
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