Sensor Installation - Carrier 42N_S serie Installations- Und Bedienanweisungen

Controls "A" - "B" - "C" - "D"
With the same operation it is possible to return to "Night" mode.
In this case, the same LED is flashing 3 times.
Booster heating (B and D controls)
This function allows the water soilenoid valve and the electric heaters
to work simultaneously. This function can be activated by means of dip-
switch (no. 5) – see dip-switch configuration section. To avoid over heating
due to simultaneous operation of water and heating elements, the
temperature of the incoming water of the coil is adjusted by a special
sensor (optional) that must be positioned on the inlet pipe. If the
function is active but the sensor is not connected, the control enters the
alarm mode, the red led flashes and all the user devices are switched off.

Sensor installation

Open the control by loosening the screw 27 (see fig. 34). Connect the
sensor on the connector side of the electronic board to connector (see
fig. 34b - rif. A). Place the sensor on the incoming water pipe using the
clips and the nylon strips supplied (see fig. 34 c). Complete by insulating
the pipe with the insulating tape supplied.
Use
Button operation:
POWER this button is used to turn the control on and off. When it
is OFF, all functions are disconnected but the control is still
powered at 230V.
If the frost protection function is selected by the special
microswitch, this function is activated even if the control
is off.
MODE this button is used to manually switch from cooling to heating
mode and vice versa. The automatic operating mode is also
available: the heating or cooling mode are automatically
selected by the microprocessor depending on the external
temperature (only for B and D control).
FAN this button is used to select the fan speed manually (low,
medium and high speed).
Keep on pressing this button to select the automatic fan
speed selection, which is controlled by the microprocessor.
If this operating mode is selected, the yellow LED is on.
Moreover, by using the same button it is possible to select
the Energy Saving function where the room temperature
required is raised by 4°C in cooling mode and reduced by 4°C
in heating mode. The green LED turns on when the Energy
Saving mode is active.
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).
"Dip-switch" function (JUMPER)
A - B - C - D Controls
Dip-switch 1
In open contact position, it allows to activate the frost protection
function ( ).
Dip-switch 2
In open contact position, it permits the fan operation at the selected
speed even if the set point temperature is satisfied.
Dip-switch 3
In open contact position, it restricts the range of the temperature
selection knob according to the following limits:
Cooling: minimum selectable temperature: 23°C.
Heating: maximum selectable temperature: 21°C.
Dip-switch 4
In open contact position, it permits to activate the fan periodically even
if the set point temperature is satisfied (air sampling).
Dip-switch 5 (B and D Controls)
In open contact position, it permits to activate the Booster Heating
function (additional heating).
Dip-switches 6, 7 and 8 (C and D Controls)
The position of these dip-switches regulates the motor pilot voltage;
a higher voltage indicates a higher fan speed. The selection is made
according to the table below.
"Dip-switch" configuration (JUMPER)
A - B - C - D Controls
Dip-switch 1
Closed Frost protection ( ) disabled.
Open Frost protection ( ) enabled.
Dip-switch 2
Closed Ventilation controlled by thermostat.
Open Continuous ventilation.
Dip-switch 3
Closed Temperature block disabled.
Open Temperature block enabled.
Dip-switch 4
Closed "Air sampling" disabled.
Open "Air sampling" enabled.
B and D Controls
Dip-switch 4
Closed Booster Heating disabled.
Open Booster Heating enabled.
C and D Controls
Dip-switch
6 7 8
Closed Closed Closed
Closed Closed Open
Closed Open Closed
Closed Open Open
Open Closed Closed
Open Closed Open
Open Open Closed
Open Open Open
NOTE: Factory setting is with all dip-switches in close position.
Use of temperature sensor
Internal sensor:
This is used in all installations where the control is wall-mounted. To
activate it, close jumper JP1 as shown in figure A and on the electronic
board screenprint.
Remote sensor
This is used on all installations with unitmounted control. It is positioned
on the return air, close to the fan. To activate it, close jumper JP1 as
shown in figure B and on the electronic board screenprint.
1 2 3
Fig. A Internal sensor
NOTE: Factory setting is with activated internal sensor.
Motor speed
LOW MID HIGH
2V 6V 10V
2V 4V 6V
6V 8V 10V
2V 3V 4V
8V 9V 10V
5V 6V 7V
4V 6V 8V
3V 6V 9V
JP1
1 2 3
Remote sensor Fig. B
42N_S 42N_E 27