M23740N6-03 01/10/07
page
14
FUNCTIONAL CONNECTIONS
UNIT WITH 3-SPEED BOARD
(only sizes 31-41-51-71)
FOR ALL THE CONNECTIONS MAKE REFERENCE TO THE ELECTRICAL
PANEL SUPPLIED WITH UNIT
TR1
The module allows to control the fan speed.
The speed, according to the user interface, can be:
•
3 speed with appropriate selector (not supplied)
•
modulating control of the speed from min. to max. by potentiometer (not supplied)
SELECTOR
POTENTIOMETER 2200 ohm
o
low speed control input to term. 3 L
o
medium speed control input to term. 3 M
o
high speed control input to term. 3 H
o
Fan control of the continuous control
o
Potentiometer supply to terminal (positive pole)
o
Potentiometer supply to terminal 5 (negative pole)
Terminals T T:
remote
ON – OFF
TR1:
ADJUSTMENT TRIMMER OF FAN SPEED
The factory calibration of the fan speed is equal to 220V AC.
Depending on the pressure drops of the ducts the air flow rate of the unit may have to be reduced at maximum speed. By
acting on trimmer TR1 anticlockwise the control power of the motor and consequently the flow rate of the unit are reduced (1/4
turn is equal to approximately -40 AC). By acting on the trimmer clockwise the flow rate at minimum speed can be increased.
Check that the air flow rate is the unit nominal one (see general technical data).
ATTENTION
: by changing one of the 3 possible speed modes of the motor the other two are automatically altered. We
therefore recommend checking that voltage and minimum speed do not fall below 110V AC. The air flow rate at minimum
speed must not be less than the one shown in the table.
These operations must be performed when the unit has been permanently installed (with all the system accessories, filter,
grilles, ducts, etc.) and with the aid of instruments suitable for the measurement of flow rate and voltage (anemometer and
multimeter).
Size
21-25
31 41 51 71
800 m
3
/h 1000
m
3
/h 1200
m
3
/h 1400
m
3
/h 2000
m
3
/h
Flow rate
222 L/sec
277 L/sec
333 L/sec
388 L/sec
555 L/sec
The 3 speed board can be coupled to:
HID-E1 3 SPEED SELECTOR
Selection of the 3 speed: MIN – MED – MAX
SUMMER / WINTER manual change
