Carrier C Manuel D'installation page 6

Type C Electronic Control
Control
Fig. 6
"Dip-switch" functions (microswitches)
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" configuration (microswitches)
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.
Dip-switch 5
No function for this model.
Dip-switchs 6, 7 and 8
The position of these dip-switches regulates the control current of
the motor. A higher voltage corresponds to a higher speed of the
fan. The selection is made according to the following table:
Jumper 1 Jumper 2 Jumper 3
Closed Closed Closed
Closed Closed Open
Closed Open Closed
Closed Open Open
Open Closed Closed
Open Closed Open
Open Open Closed
Open Open Open
GB - 4
Fig. 7
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

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 silk-screen printing.
NOTE: Factory setting is with activated internal sensor.
3 2 1
Fig. A
Internal sensor
Diagnostic warnings
The following alarm situations are indicated:
Defective sensors: the red LED flashes.
Possible causes:
• failure or short circuit of internal sensor;
• failure or short circuit of water temperature sensor.
Incorrect configuration
The green LED flashes every 0.25 seconds.
This happens when:
• in control, both centralised seasonal changeover signals "RC and
RH" are enabled.
Autotest
The "Autotest" function is activated by holding the seasonal
changeover button pressed and at the same time pressing the
speed selection button three times within 1 second. In this way it is
possible to check the starting of all fan coils.
The blue and red LEDs will begin to flash. Each of the various units
will be activated for 10 seconds in the following sequence:
Low fan speed.
Medium fan speed.
High fan speed.
CV
Motorized cold-water valve.
Fig. 8
3 2 1
Fig. B
Remote sensor
Fig. 9