Stopping The System; Prolonged Shutdown; Start-Up After Prolonged Shutdown - York YR TB TB T0 Installation Operation & Maintenance

FORM 160.81-NOM1
ISSUE DATE: 10/3/2020

STOPPING THE SYSTEM

The OptiView™ Control Center can be programmed to
start and stop automatically (maximum, once each day)
whenever desired.
1. Push the COMPRESSOR
switch. The Control Center Display will show:
SYSTEM LOCKOUT DELAY
This prevents compressor restart until system
equalization is achieved.
2. Stop the chilled water pump (if not wired into
the Control Center, in which case it will shut off
automatically).
3. Open the switch to the cooling tower fan motors,
if used.
4. The compressor sump oil heater (thermostatically
controlled) is energized when the unit is stopped.

PROLONGED SHUTDOWN

If the chiller is to be shut down for an extended pe-
riod of time (for example, over the winter season), the
following paragraphs outline the procedure to be fol-
lowed.
1. During long idle periods, the tightness of the sys-
tem should be checked periodically.
JOHNSON CONTROLS
2. If freezing temperatures are encountered while
"STOP/RESET"
3. Open the main disconnect switches to the com-

START-UP AFTER PROLONGED SHUTDOWN

1. When putting the system into operation after pro-
2. If the water systems were drained, fill the con-
the system is idle, carefully drain the cooling wa-
ter from the cooling tower, condenser, condenser
pump, and the chilled-water system chilled-water
pump and coils.
Open the drains on the evaporator and condenser
liquid heads to assure complete drainage. (If Sol-
id State Starter, drain water from starter cooling
loop.)
pressor motor, condenser water pump and the
chilled water pump. Open the 115 volt circuit to
the Control Center.
longed shutdown (such as during the winter), re-
move all oil from the separator. Install a new filter
element and charge separator with fresh oil. En-
ergize the 115 volt circuit to the control center to
energize the separator sump oil heater for at least
12 hours.
denser water circuit and chilled liquid circuit.
SECTION 3 – OPERATION
53
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