Figure 1.26. Example of connection of several thermostats in parallel.
thT bus terminals
In addition to digital input control (interior thermostats) interior terminals with thT data bus communication can also be used. These
terminals capture the inside temperature and humidity of the area associated with each outlet unit, DG1 – SG4, using a serial cable
over a Modbus protocol. They also have a digital output to control a valve for the area. A single thT terminal can be connected per
outlet unit.
Read the assembly instructions carefully before installing the terminals.
Table 1.10. Data bus connection terminals for the thT terminals.
Follow the recommendations below to connect the thT terminals to the heat pump.
Use a three-pole, shielded AWG 20-22 cable for the connection.
Connect the terminals in series for installations with more than one terminal in the network. The maximum length of the
circuit assembly should not exceed 500 metres. For connection networks with more than two thTs, it is necessary to install a
120 Ohm heater between Rx+/Tx+ and Rx-/Tx- in the first and last terminal to prevent possible communication problems.
Configure the terminal address according to the settings of the controller following the steps described in the thT terminal
manual.
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