Inside Environment Control - GeoSmart NETZERO BW Manuel D'installation

5.13. Inside environment control

The heating and cooling functions can be controlled by digital signals from relay thermostats, by interior terminals with thT bus
communication, by a combination of both or not using any interior control terminal.
Relay thermostats
Each outlet unit, from DG1 to SG4, has two 24Vac or 24Vdc digital signals to activate heating or cooling requests from the interior
thermostats or other external control devices.
Description
DG1 direct unit heating request
DG1 direct unit cooling request
SG2 mix unit heating request
SG2 mix unit cooling request
SG3 mix unit heating request
SG3 mix unit cooling request
SG4 mix unit heating request
SG4 mix unit cooling request
Table 5.10. Connection terminals for digital inputs that control outlet units DG1 - SG4.
A single thermostat or several thermostats connected in parallel can be used for each outlet unit, as shown below.
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.
thT terminal communication bus
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.
GEOSMART ENERGY
Digital input
Digital input
Digital input
Digital input
Digital input
Digital input
Digital input
Digital input
24Vac
Sgn
Figure 5.13. Example of connection of several thermostats in parallel.
Description
Table 5.11. Data bus connection terminals for the thT terminals.
Signal
24Vdc / 24Vac signal
24Vdc / 24Vac signal
24Vdc / 24Vac signal
24Vdc / 24Vac signal
24Vdc / 24Vac signal
24Vdc / 24Vac signal
24Vdc / 24Vac signal
24Vdc / 24Vac signal
Signal
ModBus RS485
31
Installer manual NETZERO
Type Connector
DI5
DI6
DI7
DI8
DI9
DI10
DI11
DI12
Connector
FBus2