ensto ECO900 Instructions De Montage Et D'utilisation page 21

5.3 Installation of air temperature sensor ECOA904
The air temperature sensor ECOA904 is installed with a cable clamp (not supplied with the equipment) either
outside the gutter or on the wall nearby. Ensure that the sensor is protected from direct sunlight. The sensor
must not be fitted in areas where heat accumulation can occur, like above windows, near lights or a chimney.
The connection cable can be extended to 50 meters by using a 1.5 mm
with numbered leads for the extension as it is very helpful for example when trying to locate faults during a
malfunction.
6. Technical data
6.1 Frost protection control unit ECO900 (figure 3)
Operating voltage
Power consumption
Ambient temperature
Storage temperature
Load relay
Alarm relay
Protection class
LCD display
6.2 Snow and ice sensor with a heating resistor for ground installation ECOA901 (figure 4)
The sensor is equipped with a heating element which melts ice and snow gathered on the sensor. Addition-
ally, the sensor has an NTC resistor to measure the sensor surface temperature as well as two metal rings as
humidity sensors.
Operating voltage
Power consumption
Surface temperature
Connection lead
Ambient temperature
Insulation color
NTC resistor, yellow and brown wires
-15 -10
°C
84,5 61,3
kΩ
Heating element, brown and green wires: 9 Ω
Humidity sensor, white and grey wires:: ∞ Ω with dry sensor surface
6.3 Temperature and moisture sensor for ground installation ECOA902 (figure 5)
The combined sensor is equipped with an NTC resistor for ground temperature measurement and two metal
rings as humidity sensors. This sensor is not independently heated.
Connection lead
Ambient temperature
Insulation color
230 V AC ± 10 %, 50 / 60 Hz
≤ 15 VA
-20...+50 °C (-4...+122 °F)
-20...+70 °C (-4...+158 °F)
250 V AC, 16 A cosφ = 1; 4 A cosφ = 0,6
250 V AC, 2 A cosφ = 1; 0,8 A cosφ = 0,6
IP20
2-rows, 16 digits
NOTE. Below 0 °C (32 °F) the correct reading of the LCD display cannot be
guaranteed. This will not, however, affect the operation of the equipment.
8 V
approx. 7 W
approx. +4 °C (+39.2 °F)
5 x 0,5 mm; 15 m PVC
-30...+80 °C (-22...+176 °F)
Yellow
-5 0
47 35
4 x 0,5 mm; 15 m PVC
-30...+80 °C (-22...+176 °F)
Blue
RAK41 / 15.3.2022
2 cable. It is recommended to use a cable
+5 +10 +15
27 20,8 16
+20 +25 +30
12,7 10 8
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