YK CENTRIFUGAL LIQUID CHILLER OptiView ... - Johnson Controls

3 EVAPORATOR SCREEN
The 'EVAPORATOR SCREEN' displays a cutaway view
of the unit evaporator showing current operating
temperatures and pressures, status of the flow switch
and liquid pump signal and the control setpoints.
The local leaving chilled liquid temperature 'SETPOINT'
and 'RANGE', and leaving chilled liquid temperature
cycling offset 'SHUTDOWN' and 'RESTART' values are
also programmed on this screen:
Setpoint
6 160-54-OI-GB0
Defines the leaving chilled liquid temperature that is to
be maintained by the unit. The 'SETPOINT' can be
programmed between 3.3°C (38°F) and 21.1°C (70°F)
for water cooling applications or -12.2°C (10°F) and
21.1°C (70°F) for brine/glycol applications.
When Smart Freeze has been enabled by a
qualified Service Technician, the
programmable 'SETPOINT' is 2.2°C (36°F) to
21.1°C (70°F) for water cooling applications.
Range
The programmed 'SETPOINT' can be reset (offset)
upwards by an analogue signal: (0-20 mA, 4-20 mA,
0-10 Vdc or 2-10 Vdc) in the analogue remote mode, or
PWM signal in digital remote mode. The offset
('RANGE') may be programmed to 5.6°C (10°F) or
11.1°C (20°F) (11.1°C is the default 'RANGE').
For example, if the 'SETPOINT' is programmed for 7°C
and the programmed 'RANGE' is 5.6°C, then the remote
device can set the leaving chilled liquid temperature
setpoint over the range 7°C to 12.6°C.
Additionally, a remote GPIC device (in ISN
remote mode) can define the setpoint through
a serial data stream