Technical data

i-KI(R) MTD
6
i-KI(R)_MTD_0031_201110_EN HFC 410A
3. OPERATING CHARACTERISTICS
TEMPERATURE CONTROL
The water temperature delivered to the heating and cooling cir-
cuit is calculated by the controller and depends on the selected
cooling and heating compensation curve.
A building’s thermal requirements do not remain constant
throughout the day or the year, but rather increase or decrease
based on the outside air temperature.
It’s therefore a waste of energy to keep the water at a constant
temperature. Delivering water at different temperatures to the
terminals based on the outside air temperature achieves high
seasonal efficiency ratios and brings considerable savings in
running costs.
The compensation curve in heating and cooling mode can be
adjusted to allow correct heat pump operation according to the
system (radiant panels, radiators, fan coils).
Example: Selecting heating curve 1.4 with an outside air tem-
perature of -5°C gives a water temperature of +55°C.
Dedicated compensation curves can be set for each zone,
depending on the type of terminal unit, or alternatively a fixed
point temperature can be selected.
A function called “room temperature influence” is available to
quickly adapt the water temperature by modifying the compen-
sation curve when the indoor conditions change, for example
when there are more occupants in the room.
This function is only available in heating mode.
In cooling operation during summer, the controller calculates
the dew point using temperature and humidity probe on the
remote terminal, which determines an increase in the water
temperature to deliver to the radiant system and activation of
the dehumidifier (one dehumidifier contact only for all zones).
HIGH EFFICIENCY AND REDUCED CONSUMPTION
The i-KI and i-KIR reverse-cycle air-to-water heat pump is fitted
with DC inverter-driven compressor and EC fan with low energy
consumption.
Inverter technology continuously controls compressor speed to
ensure perfect adaptation to system load, modulating the heat-
ing or cooling capacity delivered and consequently reducing
power consumption and achieving the highest seasonal coeffi-
cients currently available on the market.
The seasonal coefficient of performance faithfully reflects the
advantages in energy and economic terms of using the heat
pump all year around, being the ratio between energy delivered
and power consumed. In terms of improving performance and
reducing power consumption, the electronic thermostatic valve
is an important component that maximises system efficiency.
Quick and effective adaptation by the electronic thermostatic
valve to variations in load allows the compressor to always work
at optimum efficiency, as well as extending compressor life.
-25 -5
Water set point °C
Outside air temperature °C
2,2
2
1,8
1,6
1,4
1,2
1
0,8
0,6
0,4
0,2
Heating compensation curve
Te2 Outside temp.Te1
Tm2
Tm1
Water
set point
Cooling compensation curve
PROGRAMMING THE TIME BANDS
A timer is available to customise differentiated activation and
deactivation for each individual zone of the system, creating an
operating profile with up to 6 daily time bands.
Time band 1
Time band 2 Time band 3 Time band 4 Time band 5 Time band 6