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ECM-T units are fan coils for wall installation intended for air conditioning of residential and commercial premises.
The unit includes a fan, which has the purpose of moving air, and a heat exchanger, inside of which hot or cold water
must be circulated, produced by an external generator, boiler, chiller or heat pump.
ECM-T and ECM-MB fan coils include an electronic control and supervision board that manages their operation,
assuring the best indoor comfort.
ECM-T versions are controlled by a remote control with display, which lets you set the operating modes. For these ver-
sions, the air temperature sensor is inserted inside the unit underneath the air filter. Air circulation is therefore functional
to correctly reading the room temperature.
ECM-T versions are also fitted with a sensor that detects the temperature of the fluid circulating inside the coils and, by chan-
ging the settings of the control board, it is possible to use this sensor to prevent fan operation when the temperature of the
water circulating inside the coil is not sufficiently high, a typical situation that may occur in winter is that the boiler is off.
In this case the failure to circulate hot water prevents correct operation of the fan coil. An appropriate red warning light
alerts the user that the unit is not working, not because it is faulty, but because there is no hot water circulating to be
able to heat, or cold water to cool the room.
ECM-T versions, with the air sensor located inside the unit, need a special cycle, called anti-stratification cycle, requi-
red to sensitise the air temperature sensor. As a matter of fact, when the temperature setting is reached the fan stops
and, for models fitted with valve, water circulation is shut off. The cycle is activated every 18 minutes and consists of star-
ting fan operation so that air circulates in the room and in the unit, so as to assess the actual room temperature. Ventilation
is started only if hot water is available, otherwise the unit remains off pending the next cycle. The lack of hot water in
the circuit is signalled by the red LED at the bottom of the unit turning on, this is very dim in order not to be distracting
as it is not an alarm. To prevent discomfort during the night, when the boiler is turned off hence there is no hot water
available, it is recommended to use the timer function for automatic unit switch-on and off, by setting a switch-off time,
at the same time as the boiler switches off, and a switch-on time of 30 minutes later than the boiler's switching-on time.
The anti-stratification cycle is also activated the first time the heating mode is set up, as well as every time the setting
is modified.
It is possible to check the operating status of the fan coil from the signalling LEDs found at the bottom right of the unit:
ON and T3 not satisfied
Probes error (T1-T2-T3)
Open window contact
Active pump alarm
S
TATUS
OFF
ON
T3 > 70°C
LED
RED
OFF
ON
Blink
X
X
X
X
4A
LED
GREEN
OFF
ON
X
X
X
X
X
X2
X
X
Blink
X
X
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