
FORM 160.54-O1
ISSUE DATE: 9/10/2014
JOHNSON CONTROLS
28
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Leaving Chilled Liquid Temperature Setpoints
– Shutdown
Displays the Leaving Chilled Liquid Temperature at
which the chiller will shutdown on Leaving Chilled
Liquid – Low Temperature. This temperature is en-
tered as an offset with the Leaving Chilled Liquid
Temperature Cycling Offset – Shutdown Setpoint be-
low. Although the offset setpoint is changed manually,
the offset being used can change automatically to pre-
vent the Leaving Chilled Liquid Temperature from go-
ing below the minimum allowed value: 36°F (water),
34°F (water with smart freeze enabled) or 6°F (brine).
The offset being used is displayed as Effective Offset.
With software versions earlier than C.OPT.01.18.307,
the value is displayed as OFFSET and reflects the pro-
grammed value only, not the offset being used. Refer to
setpoint description below.
Leaving Chilled Liquid Temperature Setpoints
– Restart
Displays the Leaving Chilled Liquid Temperature at
which the chiller will restart after it has shutdown on
LEAVING CHILLED LIQUID – LOW TEMPERA-
TURE cycling shutdown. This temperature is set as an
offset using the Leaving Chilled Liquid Temperature
Cycling Offset – Restart Setpoint, displayed as OFF-
SET adjacent to this value.
For fields requiring access level of SER
-
VICE. Service Technicians refer to the
OptiView Control Center - Service Instruc
-
tions (Form 160.54-M1) for operation
instructions and explanation of all pro-
grammable setpoints and displayed values.
PROGRAMMABLE
Local Leaving Chilled Liquid Temperature –
Range
Access Level Required: OPERATOR
This is the range over which an analog (0 to 20mA,
4 to 20mA, 0 to 10VDC or 2 to 10VDC) in Analog
Remote mode or a digital signal (PWM) in Digital
Remote mode can reset the Leaving Chilled Liquid
Temperature Setpoint above the operator programmed
BASE Setpoint. Programmable as 10, 20, 30 or 40°F
(software version C.OPT.01.18.307 (or later); 10°F
or 20°F with earlier software versions). It is added to
the BASE value to create a range over which the re-
mote device can reset the setpoint. For example, if this
setpoint is programmed for 10°F and the operator pro-
grammed value is 45°F, then the remote device can set
the Leaving Chilled Liquid Temperature Setpoint over
the range of 45.0° to 55.0°F.
Local Leaving Chilled Liquid Temperature –
Setpoint
Access Level Required: OPERATOR
This value allows the user to define the Leaving
Chilled Liquid Temperature that is to be maintained
by the chiller. It is programmable over the range of
38.0°F to 70.0°F (water) or 10.0°F to 70.0°F (brine).
If Smart Freeze (refer to
) is enabled, the
range is 36.0°F to 70.0°F (water). The maximum al-
lowed setpoint with Heat Pump duty enabled is 86.0°F
(software version C.OPT.01.23.307 and later). A re-
mote device can provide an analog signal (0 to 20mA,
4 to 20mA, 0 to 10VDC or 2 to 10VDC) in Analog
Remote mode, or PWM signal in Digital Remote mode
that changes the setpoint by creating an offset above
the operator programmed BASE Leaving Chilled
Liquid Temperature Setpoint. This offset may be de-
fined as 10 to 20°F above the
BASE Setpoint (refer
to the
Leaving Chilled Liquid Temperature Setpoints
E-Link Gateway (in ISN Remote mode) can define the
setpoint through a serial data stream. In this case, the
incoming setpoint is not an offset that is applied to the
locally programmed BASE Setpoint value, but rather is
the setpoint value itself.
Leaving Chilled Liquid Temperature Cycling
Offset – Shutdown
Access Level Required: OPERATOR
This value allows the user to specify the Leaving
Chilled Liquid Temperature at which the chiller will
shut down on a LEAVING CHILLED LIQUID – LOW
TEMPERATURE cycling shutdown. This is done by
defining an offset below the Leaving Chilled Liq-
uid Temperature Setpoint. It is programmable over
a range of 1°F to 64°F below the setpoint, to a mini-
mum cutout of 36°F (water), 34°F (water with Smart
Freeze enabled) or 6°F (brine). Anytime the Leaving
Chilled Liquid Temperature Setpoint is increased, the
shutdown threshold is 36.0°F (water) or 6.0°F (brine)
for the next ten (10) minutes. If Smart Freeze (refer to
) is enabled, the threshold is 34.0°F for the
next 10 minutes. After ten (10) minutes have elapsed,
the shutdown threshold becomes the programmed
setpoint value.
With software version C.OPT.01.18.307 (or later), the
offset being used is displayed as Effective Offset in the
upper right area of the display. Usually, the Offset used
is the same as the value programmed for the Shutdown
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