Johnson Controls YORK OM Titan, Руководство по эксплуатации

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FORM 160.72-O1 (810)
JOHNSON CONTROLS
62
SETUP SCREEN
Liquid Temperature Setpoint Range description above).
Additionally, 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 applied
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 Temperature
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 cre-
ate 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 Leaving 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.
leaving Chilled liquid Temperature Cycling
offset –– restart
Access Level Required: OPERATOR
This value allows the user to specify the Leaving Chilled
Liquid Temperature at which the chiller will restart af-
ter a shutdown on a LEAVING CHILLED LIQUID
-LOW TEMPERATURE
cycling shutdown. This is
done by defining an offset above the Leaving Chilled
Liquid Temperature setpoint. It is programmable over a
range of 0°F to 70°F above the setpoint, to a maximum
restart value of 80°F. The chiller will automatically re-
start when this temperature is reached. This setpoint
can be used to reduce chiller cycling by delaying the
chiller restart until the cooling load has increased.
remote analog input range
Access Level Required: OPERATOR
This setpoint defines, for the Control center, the re-
mote signal range applied for remote reset of the Leav-
ing Chilled Liquid temperature Setpoint and Current
Limit Setpoint in ANALOG remote mode. If the re-
mote signal is 0-10VDC or 0-20mA, this setpoint must
be programmed for 0-10VDC. If the remote signal
is 2-10VDC or 4-20mA, this setpoint must be pro-
grammed for 2-10VDC.
navigaTion
home
Access Level Required: VIEW
Returns user to Home Screen.
Configuration
Access Level Required: SERVICE
Returns user to Configuration Screen.
options
Access Level Required: SERVICE
Returns user to Options Screen.
alarms/Trips
Access Level Required: SERVICE
Returns user to Alarms/Trips Screen.
setpoints
Access Level Required: SERVICE
Returns user to Setpoints Screen.
diagnostics
Access Level Required: SERVICE
Returns user to Diagnostics Screen.