FORM 160.54-PW7
15
YORK INTERNATIONAL
FIG. 23 – RUN CONTACTS/REMOTE RUN LIGHT AND
SHUTDOWN INDICATOR PLUS EMS
When run contacts are required for a Remote Run Light
and/or Shutdown Indicator AND Energy Management
System (EMS), connect (by others) as shown in the
diagram. The EMS, control relay, shutdown and run
lights are furnished by others. When the N.O. contacts
close, between terminals
35
and
36
on field wiring ter-
minal block TB2 in the OptiView Control Center, this
indicates that the unit is operating; the remote Run Light
will be energized. The unit run contacts open when the
unit is shutdown (safety or cycling) and the remote
indicator will then be energized. For run contacts to EMS
only refer to Fig. 4. When terminals
35
and
36
are not
used for an EMS, they may be connected to a remote
Run Light. The control relay scheme shown in Fig. 23
can also be applied for a remote Run Light AND a
Remote Shutdown Indicator, when an EMS is not used.
When Evaporator Water is flowing, the flow switch con-
tact will close. If the flow switch opens for 2 seconds,
the unit shuts down and displays “CYCLING SHUT-
DOWN – AUTO RESTART” and “LEAVING
CHILLED LIQUID – FLOW SWITCH OPEN”. The
chiller will automatically restart when the switch again
closes. The flow switch status is checked 25 seconds
into “START SEQUENCE INITIATED” and continu-
ously thereafter.
FIG. 25 – EVAPORATOR WATER PUMP INTERLOCK
OR FLOW SWITCH
LD04400
LD06838
FIG. 24 – AUXILIARY SAFETY SHUTDOWN INPUT
The closure of a Momentary or Maintained N.O. Switch
or Relay Contacts will cause the unit to shut down and
display: “SAFETY SHUTDOWN – MANUAL RE-
START” and “AUXILIARY SAFETY – CONTACTS
CLOSED”. The unit will not restart until the contacts
open and the keypad COMPRESSOR switch is moved
to the “STOP-RESET” position (“O”) and then to the
“START” (“ ”)position.
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