FORM 160.72-O1 (810)
JOHNSON CONTROLS
24
EVAPORATOR SCREEN
to over-cooling temperature. By default, the chiller
will restart at the Leaving Chilled Liquid Temperature
Setpoint.
Chilled liquid flow switch (open / Closed)
Displays whether the liquid flow is present in the evap-
orator.
Chilled liquid pump
Displays the command presently sent by the control
center to the Chilled Liquid Pump (
RUN
or
STOP
).
evaporator low pressure
Displays the low pressure setpoint in the evaporator.
evaporator saturation Temperature
Displays the present Saturation Temperature in the
evaporator.
Chilled liquid flow
Displays the Chilled Liquid Flow, in GPM, if the sen-
sor is present.
suction refrigerant Temperature
Displays the present suction refrigerant vapor tempera-
ture leaving the evaporator. If the sensor is present and
enabled under Options on the Configuration screen.
The service access level is required to enable/disable
this display.
evaporator refrigerant Temperature
(not shown)
Displays the sensor is present refrigerant liquid tem-
perature in the evaporator. If the sensor is present and
enabled at the soft key toggle on this screen. The service
access level is required to enable/disable this display.
prograMMaBle
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 (see below) is enabled, the range is 36.0°F to
70.0°F (water). A remote device can provide an analog
signal (0-20mA or 4-20mA, 0-10VDC or 2-10VDC)
in Analog Remote mode or PWM signal in Digital
Remote mode that changes the setpoint by creating
an offset above the operator programmed
Base
Leav-
ing Chilled Liquid Temperature setpoint. This offset
may be defined up to 10.0°F or 20.0°F above the
Base
setpoint (see the Remote Leaving Chilled Liquid Tem-
perature Setpoint Range description above). Addition-
ally, the E-Link gateway (in BAS Remote mode) can
define the setpoint through a serial data stream. In this
case, the incoming setpoint is not an offset that is ap-
plied to the locally programmed
Base
setpoint value,
but rather is the setpoint value itself.
local leaving Chilled liquid Temperature -
range
Access Level Required: OPERATOR
This is the range over which an analog (0-20mA or
4-20mA, 0-10VDC or 2-10VDC) in Analog Remote
Mode or a digital signal (PWM) in Digital remote
mode can reset the Leaving Chilled Liquid Tempera-
ture setpoint above the operator programmed
Base
Setpoint (see below). Programmable as either 10°F or
20°F, with a default of 20°F, it is added to the
Base
value to create a range over which the remote device
can reset the setpoint. For example, if this setpoint is
programmed for 10°F and the operator programmed
value is 45°F, then the remote device can set the Leav-
ing Chilled Liquid Temperature setpoint over the range
45.0° - 55.0°F.
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
Liquid Temperature setpoint. It is programmable over a
range of 1°F to 64°F below the setpoint, to a minimum
cutout of 36°F (water), 34°F (water with Smart Freeze
enabled) or 6°F (brine). It establishes the minimum al-
lowable temperature for the Leaving Chilled Liquid
Temperature and prevents over-cooling of the build-
ing. 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 (see below) is enabled, the threshold is
34.0°F for the next 10 minutes. After ten (10) minutes
have elapsed, the shutdown threshold becomes the pro-
grammed setpoint value.
Содержание YORK OM Titan
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