Control Installation; Fan Operation - Carrier 42N_S Installation And Operation Manual

Controls "A" - "B" - "C" - "D"

Control installation

from the control (see fig. 34). Secure the unit on the wall and mark the
drill holes.
Avoid drilling with the plastic unit already placed on wall.
34a.
base (see fig. 34a).
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.
closing the control.
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
configuration).
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 OFF automatically in relation to the water temperature.
42N_S 42N_E
26
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 configuration); 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
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
briefly flash 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 configuration.
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 configuration to the other is signalled by
a light. The Green LED flashes 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.
"Night" and "Darkening" mode
If the buttons and the knob are not pressed or used for 10 seconds, the
light is dimmed by the LEDs to reduce the disturbing light. This function
is called "Night" mode. By a special selection, the LEDs light can be fully
darkened ("Darkening" mode).
The "Darkening" mode can be selected by setting the fan speed to its
maximum value and keeping the selection button of fan speed pressed
for 5 seconds. 4 flashes of the red LED indicate the fan maximum speed.
and pressing the FAN button