5
JOHNSON CONTROLS
FORM 155.21-W2 (1209)
FIG. 3 –
REMOTE MODE READY TO START
CON TACTS
LD06820
CYCLING SHUTDOWN CONTACTS
When closed, these contacts signify the unit is not per
‑
mitted to start due to a CYCLING shutdown condition.
The unit will automatically restart after the cycling
condition is no longer present. YORK Operating and
Maintenance Manual 155.21-O1 provides a list and ex
‑
planation of all Cycling shutdowns. While these contacts
are closed, the OptiView™ Control Center will display
“
CYCLING SHUTDOWN – AUTO RESTART
” on the
System Status Bar and the cause of the shutdown on the
System Details Bar of the display. Cycling Shutdown
contacts function in all operating modes.
FIG. 4 –
CYCLING SHUTDOWN CONTACTS
LD06821
FIG. 5 –
SAFETY SHUTDOWN CONTACTS
LD06823
LD06822
RUN CONTACTS
When closed, these contacts signify that the unit is op
‑
erating. The OptiView™ Control Center will display a
System Run Message.
FIG. 6 –
RUN CONTACTS
REMOTE MODE READY TO START CONTACTS
When closed, these contacts signify the following:
1. The OptiView™ Control Center is in “digital”,
“analog” or “iSN” remote op erating mode, allow‑
ing for energy management system or remote start/
stop control (Fig. 8).
2. All chiller safety cut out controls are in the normal
position, so they will allow the unit to start.
3. All chiller cycling cutout controls are in the normal
position, so they will allow the unit to start.
4. The OptiView Control Center
UNIT
switch is in
the “
RUN
” (
l
) position.
SAFETY SHUTDOWN CONTACTS
When closed, these contacts signify the unit is not per
‑
mitted to start due to a SAFETY shutdown condition.
Safety shutdowns require a manual reset procedure be
performed before the unit can be restarted. YORK Oper
‑
ation Manual 155.21-O1 provides a list and explanation
of all Safety shutdowns. While these contacts are closed,
the OptiView™ Control Center will display “SAFETY
SHUTDOWN – RESET TO RESTART
” on the System
Status Bar and the cause of the shutdown on the System
Details Bar of the display. These contacts will remain
closed until the safety condition no longer exists and a
manual reset is performed by placing the OptiView™
Control Center RUN Switch in the "Stop-Reset" position
(O). The unit can then be restarted. Safety Shutdown
contacts function in all operating modes.
