ecoGEO C Installation and User Manual (Version 1.0)
page 48
To install the terminal both the power supply and the RS485 serial cable must be connected. Before
installation, bear in mind the following recommendations.
1.
Before connecting the power supply terminal carefully read the instructions in the Th-tune manual.
Check that the supply voltage is correct. There are 24 Vac/Vdc and 230 Vac models.
2.
To connect the RS485 serial port use AWG type 20-22 two-pole shielded cable. For cable lengths
exceeding 500 m a 120 Ohm resistor must be installed between Rx+/Tx+ and Rx-/Tx- in the first and last
terminal to avoid possible communication problems. For more information refer to the Th-Tune
manual.
The RS485 serial cable connection is made directly to the card in the BMS micro-controller connector, as
shown in the
Figure 5.8
diagram (See also sections 8.3 to 8.6).
BMS
GN
D
Rx
+/
Tx
+
Rx
-/Tx
-
Figure 5.8.
Diagram for wiring the RS485 serial cable to the electrical cabinet.
Set the address of the terminal according to the settings in the heat pump management program (see section
4.6, Menu 2.4.3). You can find more detailed information on the installation and operation of the terminal in
the Th-Tune manual.
Conventional relay type thermostats
ECOFOREST geothermal pumps can be controlled by one or more relay type thermostats (T1, T2, ..., Tn),
allowing the switching on and off of the heat pump according to heating needs of the dwelling. The control
input signal must be connected as shown in
Figure 5.9
(See also sections 8.3 to 8.6).
NOTE
Indoor environment th-Tune terminals and conventional relay type thermostats for controlling the
pump cannot coexist. This may cause the heat pump to malfunction.
The signal for " Thermostat input Dl1" should be a voltage-free signal.
The signal for "ecoGEO input DI2" should be a voltage-free signal.
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