Control Specifications; Logic Control Unit; Control Board Diagram; Description Of Terminals - SURREY CWAZH072 Manual De Instalación, Operación Y Mantenimiento

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

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.
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

To board control
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.
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