Wiring Diagram - Trane U Manual De Uso

After choosing the required function, fix the wall unit on the wall or in a built-in box (see "DIGITAL CONTROL UNIT INSTRUCTION
SHEET on page 11), taking care to position it on an inner wall of the room to be air conditioned at a height of about 1.5 m,
away from sources of heat and currents of cold air. Connect terminal board MC1 on the electronic board to the power supply
unit with two wires with a cross section of 2 x 0.50 mm 2 (see page 39, fig. 2 and electrical wiring diagram on page 42). Power
supply is 12 V DC without polarity. Power cable is also used for the transmission of data between the control unit and power unit.
Care should therefore be taken to ensure that the connection wires do not run in the same channel as the power wires. Mount
the power unit on the fan coil (see page 41) and complete the internal wiring (see electrical wiring diagram on page 44). If
there is no MWT minimum sensor, leave poles 1 and 2 free.
ATTENTION: with the "U" Type control unit on OFF, the fan coil is still supplied with 230 V. Before carrying out
maintenance, always disconnect from the voltage.
OPERATING PROGRAM WITH AUTOMATIC MODE
Thermostatic fan control
A = off fan
B = on fan
Thermostatic Valves control
A = off Valves
B = on Valves
With this program the Summer -Winter switching function is disabled.
Posizione 3 = Hot water solenoid valve off
Posizione 3' = Cold water solenoid valve off
Posizione 4 = Hot water solenoid valve on
Posizione 4' = Cold water solenoid valve on
Velocità: I = min II = med III = max
OPERATING PROGRAM WITH DEAD ZONE
Thermostatic control on the valves and continuous motor speed
A: FAN COIL (single or first in a series) connected to the "U" Type wall control unit via the "U" Type
power unit
B: FAN COIL connected to the control unit of the first fan coil by means of a cascade connection via
REPEATER FOR "U" Type
IMPORTANT: if you want to connect the same control unit to a number of FAN COILS, remember that
only the POWER UNIT FOR "U" Type is installed on the first fan coil and only the REPEATER FOR "U"
Type is installed on subsequent units.
Set
A
B

Wiring diagram

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