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USM_TH-TUNE Aire-Aire y Agua-Aire_207960_181005_EN
TH-TUNE
Packaged Air-Air and Water-Air units
ELECTRICAL CONNECTIONS
POWER SUPPLY
The thermostat can operate at 50 Hz/60 Hz, and the voltage tolerances are 230V ± 20%.
CONNECTIONS
Two wire power supply AWG18 cable (Cable section: 05 mm² to 1.5 mm²) connected to 230 VAC (L+N) terminals.
Shielded and twisted pair AWG 20/22 communication cable with drain wire connected to GND. Connect to the
terminals of the board and the thermostat. Maximum length = 500 m.
If the “Cn” message does not disappear from the TH-Tune display, it means that communication between the
thermostat and the control board has failed (possible reasons: wrong connection to the terminals, the “Rx/Tx+” and
the
“Rx/Tx-“ cables have been swapped; the connection has been made through the wrong connector; etc…).
Proceed to verifying the cable connection and make sure that they are connected to the right terminals.
ATTENTION
– To avoid possible electromagnetic interferences, separate the power cable from the
communication cable as much as possible. Never insert them in the same cable conduits including the conduits of
the electrical boxes.
Depending on the unit model, connection can be made to the terminal block instead of directly to the board.
Please refer to the wiring diagrams
.
For example:
Units equipped with an air flow controller: Connection of the air flow controller to the
thermostat is interspersed with the board. The function of the terminals is to prevent wrong
connections.
