YORK INTERNATIONAL
6
FIG. 6 – REMOTE START AND STOP CONTACTS
FROM ENERGY MANAGEMENT SYSTEM
When the Graphic Control Center is in the “Digital”,
“Analog” or “ISN” remote operating mode and the
COMPRESSOR switch is in the “RUN” (
l
) 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 shut down.
The Graphic Control Center will display “REMOTE
STOP” because the Energy Management System Re-
mote Stop Contact has commanded the unit to shut down.
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 com-
pressor from the Graphic Control Cen-
ter and prevent the chiller from restart-
ing. However, the operator cannot lo-
cally start the compressor using “com-
pressor” start switch, when the con-
trol center is in the “remote” operat-
ing mode.
FIG. 6 – REMOTE START-STOP CONTACTS FROM
ENERGY MANAGEMENT SYSTEM
FIG. 7 – REMOTE/LOCAL CYCLING DEVICES
FIG. 7 – REMOTE/LOCAL CYCLING DEVICES
The closure of an automatic reset device across this
input will permit the unit to operate in all operating
modes. Conversely, an opening of the device contacts
will inhibit the unit from operating; the Graphic Con-
trol Center will then display the following messages:
“CYCLING SHUTDOWN – AUTO RESTART” and
“SYSTEM CYCLING – CONTACTS OPEN”.
The Graphic Control Center contains
a seven day time clock to select daily
schedule Start/Stop times (Sunday
through Saturday including one or
more holidays in week) up to one full
week at a time. So automatic start and
stop of the unit on a daily basis, at pre-
determined times, can be programmed
as a standard feature; an additional
program timer is not required for this
function.
LD04387
LD04389