Specifications

YORK INTERNATIONAL 37
FORM 160.48-O1
the various bearings and gears in the event of a sys-
tem shutdown due to power failure. The reservoir, lo-
cated on the top of the compressor, allows the oil to be
distributed through the passages by gravity flow, thus
providing necessary lubrication during the compres-
sor coastdown.
OIL PUMP
For normal operation the oil pump should operate at all
times during the chiller operation. Manual pump opera-
tion may be used to establish stable oil pressure before
starting. When depressed and released, the “Manual
Oil Pump” key will operate the oil pump for 10 minutes
and then automatically shut off. To stop the oil pump
sooner, depress the “Manual Oil Pump” key again.
On shutdown of the system for any reason, the oil pump
operates and continues to run for 150 seconds. The
system cannot restart during that time interval.
OIL HEATER
During long idle periods, the oil in the compressor oil
reservoir tends to absorb as much refrigerant as it can
hold, depending upon the temperature of the oil and the
pressure in the reservoir. As the oil temperature is low-
ered, the amount of refrigerant absorbed will be
increased. If the quantity of refrigerant in the oil be-
comes excessive, violent oil foaming will result as the
pressure within the system is lowered on starting. This
foaming is caused by refrigerant boiling out of the oil as
the pressure is lowered. If this foam reaches the oil pump
suction, the bearing oil pressure will fluctuate with pos-
sible temporary loss of lubrication, causing the oil pres-
sure safety cutout to actuate and stop the system. See
Section 2.
To maintain the lowest possible concentration of refrig-
erant in the oil, the compressor oil reservoir is equip-
ped with a 115 volt electric reservoir oil heater. The oil
heater is thermostatically controlled at all times during
compressor shutdown to maintain the sump oil at 135°F
to 145°F. If the oil temperature falls below 55°F, the dis-
play will read
SYSTEM SHUTDOWN – PRESS STATUS
Pressing the “STATUS” key causes the message to read
DAY 10:00 AM – LOW OIL TEMP – AUTOSTART
The system will be allowed to automatically restart when
oil temp rises to 71°F.
SHELLS - The cooler and condenser shells are rolled
carbon steel plate with fusion welded seams. A thick
tube sheet is welded to each end of the shell and is
drilled and reamed to accommodate the tubes. All shells
have a design working pressure of 15 PSIG and are
pressure-tested at 30 PSIG.
TUBES - Individually-replaceable, 3/4" O.D., integral-
finned copper heat exchanger tubes are used in the
cooler and condenser. The tubes are roller-expanded
into the tube sheets, providing a leak-proof seal.
COMPACT WATER BOXES - Removable water boxes
are fabricated of steel. The standard design working
pressure is 150 PSIG and the boxes are tested at 225
PSIG. Integral steel water baffles are located and welded
within the water box to provide required 1, 2, or 3-pass
arrangements. Water nozzle connections with Victaulic
grooves are welded to the water boxes. These nozzle
connections are suitable for Victaulic couplings, weld-
ing or flanges (300 PSI has flanges). 1/2" coupling and
separable well are located in the entering and leaving
chilled liquid nozzles for temperature sensing elements.
Plugged 1/2" or 3/4" drain and vent connections are pro-
vided in each water box.
COOLER - The cooler is a horizontal, flooded, shell-
and-tube type, with a distribution system consisting of a
distributor trough to give uniform distribution through-
out the shell length and a perforated distributor plate,
located under the entire tube bundle, to equally distribu-
tor refrigerant. Intermediate steel tube supports are
spaced at intervals of less than four feet. Highly effi-
cient, aluminum mesh eliminators are located above the
tube bundle to prevent liquid refrigerant carryover into
the compressor.
A liquid level sight glass is conveniently located on the
side of the cooler to aid in determining proper refriger-
ant charge.
CONDENSER - The condenser is a horizontal, shell-
and-tube type, with a discharge gas baffle to prevent
direct high velocity impingement on the tubes. This baffle
is also used to distribute the refrigerant gas flow prop-
erly for most efficient heat transfer. A purge connection
is located in the condenser for efficient elimination of
noncondensibles. Intermediate steel tube supports are
spaced at intervals of less than four feet.
REFRIGERANT FLOW CONTROL - The flow control
chamber is welded to the bottom of the condenser to
allow complete drainage of liquid refrigerant from the
condenser. The chamber contains a single fixed-orifice
flow control with no moving parts.
BURSTING DISC - A 2" or 3" frangible carbon bursting
disc relief device is located in the compressor suction
line.
CONTROL CENTER (See Section 2)
A microprocessor based Control Center is factory
mounted, wired and tested on each chiller. The Control
Center enclosure is a NEMA Type 1 and is provided with
a hinged door with lock and key. The MicroComputer
Control Center automatically controls the operation of
the unit in meeting system cooling requirements while
minimizing energy use.