Carrier 42NS15 Manual De Instalación Y De Uso página 26

Controls "A" - "B" - "C" - "D"
Control installation
Remove the locking screw in the upper left side to separate
the unit from the control (see ig. 34). Secure the unit on the
wall and mark the drill holes.
Drill the holes previously marked.
Avoid drilling with the plastic unit already placed on wall.
Install the control at 1500 mm from the loor.
Remove the control connector by exerting pressure as shown
in ig. 34a.
Carry out the connections to the control connector.
After the connections to the control connector, place it back
on its base (see ig. 34a).
Fix the base to the wall using the special dowels.
Put the control cover back to its place by reinstalling the screw
previously removed.
NOTE: To install the unit control you have to buy the
corresponding kits
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.
Do not forget to conigure the dip-switches (if so required)
before closing the control.
The control cable for connection to the unit must be a
PVC cable with 1 mm² minimum or higher section for
A-C controls, and 1.5 mm² minimum section for A and B
controls.
Use a clip to join the control output cables.
Control use
A and C controls are used in 2-pipe systems and B and D
controls in 4-pipe systems with electric heaters.
Functions
The controls help keep the internal temperature set using the
knob between 10°C and 30°C.
Fan operation
Use the speed selection button of the fan to select the manual
or automatic operating mode of the fan.
In manual mode, it is possible to select three fan speeds (low/
medium/high) according to the need, or the economy mode.
In the auto mode fan speed is regulated by a microprocessor in
the control in relation to the temperature chosen.
During installation, it is possible to select continuous fan
operation via the switch located on the electronic board (see
section dip-switch coniguration).
As an option, fan operation can be disabled during heating
by means of a sensor if water temperature is below 35°C, and
during cooling if water temperature is above 18°C (only for A
and C control).
These two functions allow improved comfort levels during
winter by avoiding undesired fan operation and during
summer by turning the fan coils on and of automatically in
relation to the water temperature.
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42N_S 42N_E
Frost - protection
This function keeps the temperature from dropping below 7°C
in rooms not used for long periods of time.
When this temperature is reached, the control activates the
valve and puts the fan on high speed.
The frost protection function can be activated through the
associated micro-switch (see section dip-switch coniguration);
if enabled, this function activates even when the control is in
the OFF position.
Energy saving
This function is especially useful when air conditioning at night
or in rooms where the user is likely to be absent for a longer
period of time.
In this case, by selecting the function
button repeatedly it is possible to raise temperature by 4°C in
cooling mode and reduce it by 4°C in heating mode.
Enabling this function (Green LED ON) cuts out other displays.
Seasonal changeover
Manual (A, B, C, D controls)
Selection of heating/cooling is done manually by pushing the
button on the control.
Automatic (B and D controls)
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.
Centralised (A and C controls)
Centralised seasonal changeover can be done in two ways:
- by a switch located on the central control panel that allows
heating/cooling mode changeover;
- by a temperature sensor (Accessory) located in contact with
the entering water pipe.
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 briely lash while maintaining the activated mode.
In any case, centralised changeover takes priority over local
changeover.
External contact
The control has an 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 (open window)
or to Energy Saving (empty room), depending on the control
coniguration. If the control is set to OFF, as a consequence
all outputs are disconnected (fan, valves, etc.) and only the
frost protection function is active if it has been enabled by its
corresponding dip-switch. If the control is set to Energy Saving,
the internal temperature is raised by 4°C in cooling mode and
reduced by 4°C in heating mode.
To switch from one operating mode to the other, keep the Power
button and the speed selection button pressed for at least 5
seconds. The switching from one coniguration to the other is
signalled by a light. The Green LED lashes 3 times when switching
from OFF to Energy Saving and the same green LED remains ON
for 3 seconds when switching from Energy Saving to OFF.
and pressing the FAN