YORK INTERNATIONAL
130
FORM 160.55-O1 (920)
System Operating Procedures
condenser water, and cooling tower fans will stop
automatically. The oil pump will continue to run
for a period of 150 seconds. The oil pump will then
stop automatically. Once stopped, the
“SYSTEM
COASTDOWN”
display will be replaced by
“SYS
-
TEM READY TO START”.
2. Stop the chilled water pump (if not wired into the
OptiView Control Center, in which case it will
shut off automatically simultaneously with the oil
pump.) (The actual water pump contact operation is
dependent upon the position of Microboard Program
Switch SW1-8.)
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 period of
time (for example, over the winter season), the following
paragraphs outline the procedure to be followed.
1. After the system pressure has risen above atmo-
spheric, test all system joints for refrigerant leaks
with a leak detector. If equipment room is below
70°F, circulate hot water (not to exceed 100°F)
through the cooler tubes to raise the system pres-
sure. If any leaks are found, they should be repaired
before allowing the system to stand for a long period
of time.
During long idle periods, the tightness of the system
should be checked periodically.
2. If freezing temperatures are encountered while the
system is idle, carefully drain the cooling water from
the cooling tower, condenser, condenser pump, and
the chilled water system-chilled water pump and
coils. Open the drains on the cooler and condenser
liquid heads to assure complete drainage. (If a Vari-
able Speed Drive, drain its water cooling system. If
Solid State Starter, drain water from starter cooling
loop. Isolate the Turboguard purge unit from the
main system.)
3. Isolate the Turboguard purge unit from the main
system.
4. Disable clock on
SETUP
Screen. This conserves the
battery.
5. Open the main disconnect switches to the compressor
motor, condenser water pump and the chilled water
pump. Open the 115 volt circuit to the Control Cen-
ter.
START UP AFTER PROLONGED SHUTDOWN
1. When putting the system into operation after pro-
longed shutdown (during the winter), remove all
oil from the compressor. Install a new filter element
and charge compressor with fresh oil. Replace purge
unit and oil return filters. Enable clock on
SETUP
Screen.
2. Operate the “
OIL PUMP
” (press and release the
manual oil pump key) until steady oil pressure is es-
tablished. Then press and release the “
OIL PUMP
”
key to stop operation of the oil pump. If the water
systems were drained, fill the condenser water circuit
and chilled liquid circuit.
