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A 3 : Connector for the water temperature
sensor at the chiller outlet (inside
sensor).
A 4 : Connector for the water temperature
sensor outside the chiller (outside
sensor).
OUT1 : Output for the activation of the
compressor contactor.
OUT2 : Output for the liquid line solenoid
activation.
6.4 - CONTROL FRONT BUTTONS AND INDICATORS
P1 : OFF button.
P2 : ON button.
L1 : Equipment ON indicator.
L2 : Operating compressor indicator.
L3 : Activated anti-cycling timer indicator.
L4 : Anti-freeze device activated.
L5 : Pressostat opening indicator.
L6 : Power supply ON Indicator.
To board control
6. CONTROL SPECIFICATIONS
6.1 - LOGIC CONTROL UNIT
Description: Logic control unit for liquid chillers with the
following characteristics:
- Control panel of the "Soft Touch" type with on/off keys
and indicators of: Power supply, compressor in operation,
timer, protection against freezing and protection by
pressostats.
- Analog inputs for leaving/return water temperature
sensors.
- Digital inputs for: Selection of the freezing temperature
(2°C o –7°C), protection pressostat and inlets to control
the distance.
- Control outlets for the compressor and liquid line
solenoid.
- Potentiometer to set the temperature and water outlet.
6.2 - CONTROL BOARD DIAGRAM
6.3 - DESCRIPTION OF TERMINALS
24V, GND : Power supply for the control board,
24Vca - 50/60Hz.
IN 1 : Pressostat input
IN 2 : Power supply for the solenoid valve
IN 4 : Freezing temperature selection: without
connecting it is equivalent to 2°C,
connecting to 24Vca it is equal to –7°C
IN 5 :
Remote On/Off:
without connecting, the
unit remains off, connecting at 24Vca,
the unit will turn on remotely or locally
depending on the IN6 input.
IN 6 : Remote control activation: Without
connecting, the control is local through
the control front buttons, connecting at
24VCa, the remote control is made
through the IN5 input.
Connecting
adjustment
temperature
Connecting
front of the
control
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