Fig. 4 - Run Contacts; Fig. 5 - Anticipatory Alarm Contacts; Fig. 6 - Remote Start-Stop Contacts From Energy Management System - York MAXE YST Wiring Diagram

FIG. 4 – RUN CONTACTS
RUN CONTACTS
When closed, these contacts signify that the unit has
been started, the prelube has been completed, and the
turbine slow roll may be started. If the turbine trip valve
has opened, the OptiView
the message "READY TO BEGIN SLOW ROLL".
FIG. 5 – ANTICIPATORY ALARM CONTACTS
ANTICIPATORY ALARM CONTACTS
These contacts will close whenever one or more
WARNING condition occurs. They will remain closed
as long as the condition is in effect. On most warnings,
the contacts automatically open when the condition is
NO longer present. On some Warnings, the contacts
will open only after the condition is NO longer present
and the WARNING RESET Key is pressed in Operator
(or higher) access level.
YORK Operating and Maintenance Manual 160.67-
O1 provides a list and explanation of all WARNING
conditions that will close these contacts.
JOHNSON CONTROLS
LD06822
Control Center will display
™
LD04604
FIG. 6 – REMOTE START-STOP CONTACTS FROM
ENERGY MANAGEMENT SYSTEM
REMOTE START AND STOP CONTACTS FROM
ENERGY MANAGEMENT SYSTEM
When the OptiView Control Center is in the "Digital",
™
"Analog" or "ISN" remote operating mode and the
COMPRESSOR switch is in the "RUN" (ı) position,
with the Remote Stop Contacts open, and the Remote
Mode Ready to Start Contacts closed (FIG. 1), the unit
will start via a closure of the Remote Start Contacts. A
subsequent closure of the Energy Management System
Remote Stop Contacts causes the chiller to shutdown
after a controlled shutdown sequence has been com-
pleted. The OptiView
™
"REMOTE STOP" because the Energy Management
System Remote Stop Contacts has commanded the unit
to shutdown.
It is recommended that maintained contacts be used for
both START and STOP.
Even when the chiller is applied with
Remote Start-Stop (when the Control
Center is in the "Remote Operating
Mode"), an EMERGENCY STOP by
an operator or others can STOP the
compressor from the OptiView Con-
trol Center and prevent the chiller
from restarting. However, the operator
cannot locally start the compressor us-
ing "Compressor" start switch, when
the Control Center is in the "Remote"
FORM 160.67-PW2 (1007)
LD06824
Control Center will display
5