Trane U Manual De Uso página 9

• INTRODUCTION
Avant-garde design has created an easy to programme and highly sensitive automatic electronic control.
The fan coil can be operated via the numerous functions and options incorporated in this microprocessor controlled unit, with the possibility
of displaying the selected operating modes by symbols on a liquid crystal display.
The basic functions of the control unit consist in:
- Turning the fan coil on and off
- Reading room temperature
- Setting and reading the required room temperature (SET)
- Selecting the summer or winter operating cycle directly from the control keypad, via an electric signal from the heat generator or
via automatic CHANGEOVER intwo-tube installations.
- Manual selection of the three fan speeds
- Automatic selection of the three fan speeds according to the difference between the set temperature and the room temperature.
- In both summer and winter cycle, thermostatic control of opening and closing (ON/OFF) of the water valve (two-tube installation) or
the two valves (four-tube installation).
- In four-tube fan coils with ON/OFF water valves and the two liquids (hot and cold water) constantly present in the circuits, automatic
switching between heating and cooling phases according to the difference between set temperature and room temperature with a
dead zone of ~2°C.
- By sending a centralised phase electric signal via timer or simple switch to the control unit, the set temperature can be varied (reduction
of 3°C in the winter set point and increase of 3°C in summer set point), particularly useful during night operation. Alternatively, fan
coil operation can be disabled during periods of inactivity.
- In the winter cycle only, if a minimum sensor is connected (MWT accessory located between the fins of the heat exchange coil), the
fan coil will start up only if the water temperature rises above 42°C and shut down when water temperature drops below 38°C.
- Thermostatic control of the electrical resistor (accessory) when installed on the fan coil as a complementary heater.
The "U" Type control consists of two units
- Control unit with display keypad to be installed on an internal wall in the room to be air conditioned, away from heat sources and
currents of cold air.
- power unit to be positioned on the fan coil
The power unit powered by 230 V and wired to the various fan coil components is connected by two wires (12V DC) to the control unit.
Attention: with the "U" Type control unit OFF, the fan coil is still powered by 230 V. Before carrying out maintenance,
always isolate from voltage.
"U" TYPE AUTOMATIC ELECTRONIC CONTROL
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