Installer manual ecoGEO
49
Analogue inputs (AIxx)
These terminals are used to connect external temperature probes. Only passive NTC temperature probes can be connected, so cable
connection polarity is not important.
If necessary, use extension cables with a maximum length of 50 m and a minimum diameter of 0.75 mm
2
. For greater lengths (up to
120 m) it is recommended to use cable with a section of 1.5 mm
2
.
Use original temperature probes only; other types of components could cause poor heat pump
operation and/or cause heat pump component breakdowns.
Figure 1.18. Example of temperature probe connections.
Digital control inputs (DIxx)
Digital signals from thermostats or other external devices can be connected to these terminals to control heat pump production
functions.
Take special care with the working voltage of each digital input; improper handling could cause poor
heat pump operation and/or heat pump component breakdowns. Some digital inputs require voltage-
free signals, while others require 24Vac / 24Vdc signals.
Figure 1.19. Example of voltage-free digital input connections.
Do not power external components connected to the digital inputs from the 24 Vac power supply of the
heat pump; this could cause poor heat pump operation and/or heat pump component breakdowns.
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