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YORK INTERNATIONAL
58
FORM 160.55-O1 (604)
SETPOINTS SCREEN
OVERVIEW
This screen provides a convenient location for pro gram -
ming the most common setpoints involved in the chiller
control. This screen also serves as a gate way to a subscreen
for deÞ ning the setup of general system parameters.
DISPLAY ONLY
Leaving Chilled Liquid Temperature - Setpoint
Displays the present setpoint to which the chill er is op er -
at ing whether controlled remotely or locally. This val ue
could come from a 0-20mA, 4-20mA, 0-10VDC or 2-
10VDC input in An a log Remote mode, PWM sig nal in
Digital Remote mode, MicroGateway interface in ISN
mode or a locally pro grammed value.
Leaving Chilled Liquid Temperature Cy cling - Shut-
down
Displays the Leaving Chilled Liquid Tem per a ture at
which the chiller will shut down to avoid over-cooling
the build ing. This value is calculated by sub tract ing the
Leaving Chilled Liquid Temperature Cy cling Offset
– Shutdown from the Leaving Chilled Liq uid Tem-
per a ture Setpoint. If this value is below the absolute
min i mum allowed shut down temperature the minimum
val ue is displayed.
Leaving Chilled Liquid Temperature Cy cling – Re-
start
Displays the Leaving Chilled Liquid Tem per a ture at which
the chiller will restart after it has shut down due to over-
cooling temperature. This value is calculated by adding
the Leaving Chilled Liquid Tem per a ture Cycling Offset
– Re start to the Leaving Chilled Liquid Tem per a ture
Setpoint.
Current limit Setpoint
Displays the active Current Limit setpoint. In Local
mode, this is the locally programmed Current Limit
setpoint. In ISN remote mode, this is the setpoint re-
ceived from the MicroGateway interface. In Analog re-
mote mode, this is the setpoint received via 0-10VDC,
2-10VDC, 0-20mA or 4-20mA input. In Digital remote
mode, this is the Pulse Width Modulation input.
PROGRAMMABLE
Local Leaving Chilled Liquid Tem per a ture -
Range Access Level Re quired: OPERATOR
This is the range over which an analog signal (0-20mA, 4-
20mA, 0-10VDC or 2-10VDC) in Analog Re mote Mode
or a digital sig nal (PWM) in Digital remote mode can reset
the Leav ing Chilled Liquid Temperature setpoint above
the op er a tor programmed Base Setpoint (see be low).
Pro gram ma ble as either 10°F or 20°F, with a de fault
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
ex am ple, if this setpoint is pro grammed for 10°F and
the operator programmed value is 45°F, then the remote
device can set the Leaving Chilled Liq uid Tem per a ture
setpoint over the range 45.0° - 55.0°F.
00364VIP
FIG. 25
OptiView Control Center