External Contact - Carrier 42N Installations- Und Bedienanweisungen

Controls
Seasonal changeover
Manual
Selection of heating/cooling is done manually by pushing the button
on the control.
Centralised (only for type "A" control)
Centralised seasonal changeover can be done in two ways:
- by a switch located on the central control panel that allows
heating/cooling mode changeover (to be made by the installer).
- by a temperature sensor located in contact with the entering
water pipe (accessory).
In this last mode, fan coil operation is driven by the control, in
cooling or heating, depending on the temperature read by the
sensor.
Switch and sensor operate on 230V power supply, so both must be
adequately insulated. If the seasonal manual changeover button is
pushed while the centralised changeover mode is activated, the
corresponding LED will briefly flash while maintaining the activated
mode.
In any case, centralised changeover takes priority over local
changeover.
Automatic, based on air temperature (only for type "B" control)
The automatic seasonal changeover allows automatic switching of
the fan coil operating mode to cooling or heating, depending on the
temperature set by the user and on the room temperature.

External contact

The control has a 230V input that can be used as window contact
or presence detection.
When such a signal is activated (presence of line voltage on the
terminal block contact) the control is set to OFF mode.
As a consequence, all outputs (fan, valves etc.) are disconnected,
and only the frost protection is active, if switched ON by the
appropriate dip-switch.
The external contact input (Ec) is directly connected to the mains
voltage (230V).
All connections must be properly insulated in order to prevent
electric shock.
Unit-mounted control
Preliminary operations:
• Disconnect the main power supply.
• Remove cabinet.
• Access upper part of control box panel positioning the control as
shown.
IMPORTANT:
If necessary make dip switch configuration before closing the
control cover.
(See fig.32)
• Open the control box panel, carry out connections from the
control to the terminal block.
The cable from the control has one or two polarized connectors to
avoid risk of connection errors.
• Place the temperature sensor in the proper location.
• Place the control in the proper metal plate tabs and fix it with the
2 screws.
Wall-mounted control
• Prepare electrical connections between the control terminal block
and the unit control box panel.
• Remove the control cover, unscrewing the screw located in the
bottom part.
• Disconnect the connection cable (provided) and corresponding
sensor (air) as they are no longer needed.
• Configure jumper (JP1) to the "activated internal sensor" position
(see paragraph "Use of temperature sensor").
• Secure the control to the wall, marking the drill holes.
• Drill the holes previously marked.
Avoid drilling with the control already placed on wall.
• Fix the control using the screw anchors (See fig.33)
IMPORTANT:
• All connections between the unit and the control must be
placed into a proper plastic conduit.
• Handle the control with extreme care. Do not touch electronic
components to avoid damaging them.
• Replace the control cover and the screw previously removed.
Use
ON/OFF/fan speed selector
OFF In this position the control is OFF and all functions are
disabled.
If the frost protection function is selected by the dip-switch,
this is activated even if the control is in OFF position.
With selector in this position, the fan operates at low speed.
With selector in this position, the fan operates at medium
speed.
With selector in this position, the fan operates at high
speed.
AUTO The control maintains the selected temperature, acting
automatically on the fan speed.
Temperature selector
Its purpose is to maintain the temperature at the desired level.The
reference value at the centre of the range is 20°C .
By turning the knob towards the symbol (–) the temperature is
reduced from the original setting (minimum value is 10°C).
By turning the knob towards the symbol (+), the temperature is
raised from the original setting (maximum value is 30°C).
Seasonal changeover button
This button allows selecting the operating mode, cooling, heating or
automatic (the last function is only possible with type "B" control).
If the sensor for centralised changeover is connected, this button is
disconnected (only on type "A" control).
Energy saving button
This button activates the energy saving function which modifies
room temperature as follows: in heating, the selected temperature is
reduced by 4°C; in cooling, the selected temperature is raised by 4°C.
42N 21