Carrier Acqua Junior 30AJ Series Installation, Operation And Maintenance Manual page 60

6. Control specifi cations
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.
• A n a l o g i n p u t s f o r l e a v i n g / r e t u r n w a t e r
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
Connecting
adjustment
temperature
Connecting
front of the
control
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.
60
A 3 : Connector for the water temperature
s e n s o r a t t h e c h i l l e r o u t l e t
(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 : O u t p u t f o r t h e l i q u i d l i n e
solenoid activation.
6.4 Control front buttons and indicators
To board control
L1
L2
L3
L4
L5
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.
P1
P2
L6