Water-Cooled Oil Cooler; Motor Driveline; Heat Exchangers; Shells - York YK Manual

FORM 160.75-EG1 (519)
Equipment Overview (Cont'd)
Oil is filtered by an externally mounted 1/2 micron replaceable cartridge oil filter equipped
with service valves. Oil is cooled via a refrigerant-cooled oil cooler, eliminating the require-
ment for field water piping. The oil side of the oil cooler is provided with service valves. An
automatic oil return system recovers any oil that may have migrated to the evaporator. Oil
piping is completely factory-installed.

WATER-COOLED OIL COOLER

An optional condenser water-cooled oil cooler is offered for units with Q3 compressors
C-D shells only. This oil cooler is a shell and tube heat exchanger. Water from condenser
supply waterbox circulates through the tube side of the heat exchanger and discharges
back into the return side of the waterbox. Hot oil circulates through the tubes within the oil
cooler, and is cooled by the cold condenser water. The cooled oil is then sent back to the
compressor through a temperature regulator valve and oil filters. Both the oil and water
piping are completely factory-installed, eliminating the requirement for field piping.

MOTOR DRIVELINE

The compressor motor is an open drip proof, squirrel cage, induction type constructed to
YORK design specifications. The 60 hertz motors operate at 3570 rpm and the 50 hertz
®
motors operate at 2975 rpm.
The open motor is provided with a D flange, and is factory-mounted to a cast iron adaptor
mounted on the compressor. This unique design allows the motor to be rigidly coupled to
the compressor to provide factory alignment of motor and compressor shafts.
Motor drive shaft is directly connected to the compressor shaft with a flexible disc cou-
pling. Coupling has all metal construction with no wearing parts to assure long life, and no
lubrication requirements to provide low maintenance.
For units utilizing remote electromechanical starters, a large, steel terminal box with gas-
keted front access cover is provided for field-connected conduit. There are six terminals
(three for medium voltage) brought through the motor casing into the terminal box. Jump-
ers are furnished for three-lead types of starting. Motor terminal lugs are not furnished.
Overload/over-current transformers are furnished with all units. For units furnished with
factory-packaged Solid-State Starters or Variable Speed Drive (VSD), see Accessories
and Modifications on page 27.

HEAT EXCHANGERS

Shells

Evaporator and condenser shells are fabricated from rolled carbon steel plates with fu-
sion welded seams or carbon steel pipe. Carbon steel tube sheets, drilled and reamed to
accommodate the tubes, are welded to the end of each shell. Intermediate tube supports
are fabricated from carbon steel plates, drilled and reamed to eliminate sharp edges, and
spaced no more than four feet apart. The refrigerant side of each shell is designed, tested,
and stamped in accordance with ASME Boiler and Pressure Vessel Code, Section VIII –
Division I, or other pressure vessel code as appropriate.
10 JOHNSON CONTROLS