Specifications

YORK INTERNATIONAL 35
FORM 160.48-O1
for 150 seconds (6 min. if Micro Board jumper JP-4
removed). The compressor, condenser water, and
cooling tower fans will stop automatically. The oil
pump will continue to run for a period of 150 sec-
onds. The oil pump will then stop automatically.
Once stopped, the
SYSTEM COASTDOWN
display will be replaced by
SYSTEM READY TO START
2. Stop the chilled water pump (if not wired into the
Microcomputer 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 Micro Board jumper
J-54.)
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 follow-
ing 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 pressure. If any
leaks are found, they should be repaired before al-
lowing 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 sys-
tem.
4. Move jumper J-57 on the Micro Board from CLOCK
ON position (CLKON) to CLOCK OFF position
(CLKOFF) while 115VAC control power is applied.
This conserves the battery.
5. Open the main disconnect switches to the compres-
sor motor, condenser water pump and the chilled
water pump. Open the 115 volt circuit to the Control
Center.
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. Move jumper J-57 on the micro
board from CLOCK OFF position (CLKOFF) to
CLOCK ON position (CLKON) and reset the clock.
Energize the 115 volt circuit to the Control Center to
energize the compressor sump oil heater for at least
12 hours.
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 cir-
cuit and chilled liquid circuit.
CASING - The casing is accessible with vertical cir-
cular joints and fabricated of close-grain cast iron. The
motor assembly is completely removable from the com-
pressor rotor and scroll assembly. Compressor cast-
ings are designed for 15 PSIG working pressure and
hydrostatically pressure tested at 50 PSIG.
COMPRESSOR - The rotor assembly consists of a heat
treated alloy steel drive shaft (integral with pinion gear)
and a lightweight, high strength, fully shrouded cast
aluminum impeller. The impeller is designed for balanced
thrust. The impeller is dynamically balanced to insure
vibration free operation and is overspeed tested for safety.
BEARINGS - Insert type journal and thrust bearings
are fabricated of aluminum alloy and are precision bored
and axially grooved.
INTERNAL GEARS - Single helical gears with crowned
teeth are employed so that more than one tooth is in
contact at all times to provide even distribution of the
SECTION 4
SYSTEM COMPONENTS DESCRIPTION -
COMPRESSOR/MOTOR ASSEMBLY