Carrier Type A Electronic Control Manuel D'installation page 6

Type A Electronic Control
Control

OFF
Fig. 6
 Internal temperature
sensor
 Dip-switch selector
Dip-switch functions (Microswitch)
Dip-switch No. 1
When ON permits enabling the frost protection ( ) function.
Dip-switch No. 2
When ON permits fan operation at the selected speed even if the
set point is satisfied.
Dip-switch No. 3
When ON restricts the range of temperature selection, according to
the following limits:
Cooling:
minimum selectable temperature: 23°C.
Heating:
maximum selectable temperature: 2°C.
Dip-switch No. 4
When ON periodically activates the fan even if the set point is sati-
sfied (air sampling).
GB - 4
On
 2 3 4
Dip-Switch configurations
(Microswitch)
Dip-switch 1
OFF Frost protection ( ) disabled.
ON Frost protection ( ) enabled.
Dip-switch 2
OFF Ventilation controlled by thermostat.
ON Continuous ventilation.
Dip-switch 3
OFF Temperature block disabled.

ON Temperature block enabled.
Dip-switch 4
OFF Air sampling disabled.
ON "Air sampling enabled.
NOTE:
Factory setting is with all dip-switches in the OFF position.
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 yellow 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 changeo-
ver button pressed and at the same time pressing the " " button
three times within  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.