AWR MTD2 XE
6
AWR_MTD2_XE_0011_0091_201109_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).
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.
SYSTEM PUMP OPERATION
When reaching the system water temperature set point, the
compressor stops and the system pump is activated periodical-
ly, so as to minimise energy consumption and ensure correct
measurement of the water temperature.
The pump on and off times can be set using a parameter,
according to the type of system.
In systems with fan coils, the time between one sniffing cycle
and the next should be reduced in order to avoid excessive
cooling of the water, in heating operation, and if and if the sys-
tem water content is equal to the minimum value shown in the
paragraph on “Minimum and maximum system water content”.
Up to four operating curves can be selected, depending on the
pressure drop in the system, so as to optimise pump operation
and reduce power consumption.
The pumps are class A with EC motors.
-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
0
10
20
30
40
50
60
70
80
0 0,5 1 1,5 2 2,5
Useful pressure head [kPa]
Water flow-rate [m
3
/h]
Curve 4
Curve 3
Curve 2
Curve 1
Te2 Outside temp.Te1
Tm2
Tm1
Water
set point
Time band 1
Time band 2 Time band 3 Time band 4 Time band 5 Time band 6
Cooling compensation curve
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