13
JOHNSON CONTROLS
FORM 155.21-W2 (1209)
LD06836
FIG. 21 –
RUN CONTACTS / REMOTE RUN LIGHT
AND SHUTDOWN INDICATOR PLUS EMS
12. While the chilled water flow switch is tripped after
shutdown as described in item (8) and the solution
temperature is below 136°F, check for crystalliza
‑
tion.
13. While the condenser water flow is tripped/open; if
the solution temperature falls to less than 136°F,
check for crystallization.
When all safety controls are satisfied, and the OptiV
‑
iew control center "unit" switch has been placed in the
"STOP/RESET" position, (de-energizing the alarm) and
then in the "RUN" position, the unit may be restarted,
if the control center is in "REMOTE" mode, via the
Remote Start Contacts (FIG. 8); or if the control center
is in "local" mode the unit may be started by pressing
the keypad-mounted "unit" switch to the "START"
position.
If the unit was shut down because of
Cycling Shutdown Contacts (see FIG.
4) the alarm will not be energized, but
the unit will have been shut down. A
closure of the safety alarm contacts
means that an operator must manually
reset and restart the unit.
When the Safety Shutdown contacts close, the OptiV
‑
iew™ Control Center will display the following message:
“SAFETY SHUTDOWN – MANUAL RESTART”, and
the cause of shutdown.
RUN CONTACTS/REMOTE RUN LIGHT AND
SHUTDOWN INDICATOR PLUS EMS
When run contacts are required for a Remote Run Light
and/or Shut down Indicator AND Energy Management
System (EMS), connect (by others) as shown in the dia
‑
gram. 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 terminal
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 indica tor
will then be energized. For run contacts to EMS only
refer to Fig
. 6. 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
. 21 can
also be applied for a Remote Run Light and a Remote
Shutdown indicator, when an EMS is not used.
LD06838
FIG. 22 –
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: system status - "RESET TO RESTART" and
under fault message - "AUXILLIARY SAFETY SHUT
‑
DOWN". The unit will not restart until the contacts open
and the keypad "unit" switch is moved to the “STOP/
RESET” position and then to the “START” position.
