York YDHF-39 User manual

SERVICE INSTRUCTION
CENTRIFUGAL COMPRESSORS
Supersedes: 160.49-M1 (1292) Form 160.49-M1 (601)
USED WITH YORK MODEL YK
CENTRIFUGAL LIQUID CHILLERS
26439A
COMPRESSOR COMPRESSOR
MODEL CODE
YDHF-39 P1
YDHF-40 P2
YDHF-42 P3
YDHF-44 P4
YDHA-36 & LHA-36 G3
YDHA-41 & LHA-41 G4
YDHA-46 & LHA-46 H0
YDHA-50N & LHA-50N H1
YDHA-50W & LHA-50W H1
YDHB-57, LHB-57, HA-57 H2
YDHB-61 H3
YDHD-46 H4
YDHD-50N & 50W H5
YDHD-57 H6
YDHD-59 H7
YDHD-61 H8
YDHA-65 & LHA-65 J1
YDHA-73 & LHA-73 J2
YDHA-81 & LHA-81 J3
YDHA-90 & LHA-90 J4
(Also see NOMENCLATURE, page 5)

YORK INTERNATIONAL
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FORM 160.49-M1
3
YORK INTERNATIONAL
This equipment is a relatively complicated apparatus.
During installation, operation, maintenance or service,
individuals may be exposed to certain components or
conditions including, but not limited to: refrigerants, oils,
materials under pressure, rotating components, and both
high and low voltage. Each of these items has the po-
tential, if misused or handled improperly, to cause bodily
injury or death. It is the obligation and responsibility of
operating/service personnel to identify and recognize
these inherent hazards, protect themselves, and proceed
safely in completing their tasks. Failure to comply with
any of these requirements could result in serious dam-
age to the equipment and the property in which it is
situated, as well as severe personal injury or death to
themselves and people at the site.
This document is intended for use by owner-authorized
operating/service personnel. It is expected that this indi-
vidual possesses independent training that will enable
them to perform their assigned tasks properly and safely.
It is essential that, prior to performing any task on this
equipment, this individual shall have read and understood
this document and any referenced materials. This indi-
vidual shall also be familiar with and comply with all
applicable governmental standards and regulations per-
taining to the task in question.
SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to areas of potential hazard:
WARNING indicates a potentially
hazardous situation which, if not
avoided, could result in death or seri-
ous injury.
DANGER indicates an imminently
hazardous situation which, if not
avoided, will result in death or seri-
ous injury.
CAUTION identifies a hazard which
could lead to damage to the machine,
damage to other equipment and/or en-
vironmental pollution. Usually an in-
struction will be given, together with
a brief explanation.
NOTE is used to highlight additional
information which may be helpful to
you.
IMPORTANT!
Read BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES

YORK INTERNATIONAL
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TABLE OF CONTENTS
SECTION 1GENERAL
General Description ........................................................................................... 5
Nomenclature .................................................................................................... 5
SECTION 2COMPRESSOR SERVICE
Service Guidelines ............................................................................................. 6
Cleaning & Checking Wearing Parts ................................................................. 6
Rigging The Compressor or Motor ................................................................... 7
Weights .............................................................................................................. 7
Torque Values .................................................................................................... 7
Special Tools ...................................................................................................... 8
Motor Removal & Replacement ...................................................................... 13
Shaft Seal ......................................................................................................... 14
Disassembly Of Rotor Support ....................................................................... 17
Removing The Impeller ................................................................................... 17
Removing Balance Piston Seal & Diffuser Plate ............................................. 20
Removing Front Low-Speed Bearings ............................................................ 22
Removing Front High-Speed Bearings ............................................................ 22
Removing Bearing Housing & Gears .............................................................. 24
Rear Low-Speed Bearing ................................................................................. 24
Rear High-Speed Bearing Components ........................................................... 26
Installing Gears ................................................................................................ 30
Installing Bearing Housing ............................................................................... 30
Installing Front High-Speed Bearings .............................................................. 30
Installing Front Low-Speed Bearings .............................................................. 30
Installing Balance Piston & Diffuser Plate ...................................................... 31
Installing The Impeller ..................................................................................... 31
Disassembly Of Rotor Scroll ........................................................................... 32
Removing The Nozzle Base Plate .................................................................... 32
Removing The Impeller Eye Seal .................................................................... 33
Re-Assembly Of Eye Seal ............................................................................... 34
Re-Assembly Of Nozzle Base Plate ................................................................. 34
Re-Assembly Of Scroll Housing To Rotor Support ........................................ 34
Removing The Pre-Rotation Vane Housing ..................................................... 35
Replacing Control Shaft Assembly .................................................................. 37
SECTION 3OIL PUMP SERVICE
Oil Pump .......................................................................................................... 38
Removing Oil Pump From Oil Sump .............................................................. 38
Disassembling The Oil Pump .......................................................................... 39
Re-Assembly Of Oil Pump .............................................................................. 39
Re-Assembly Of Oil Pump Into Oil Sump ...................................................... 42
REFERENCE LITERATURE
Installation – Unit 160.49-N1
Operation – Unit 160.49-O1
Renewal Parts – Unit 160.49-RP1
Renewal Parts – Compressor 160.49-RP2
Coupling Assembly 160.49-N4

FORM 160.49-M1
5
YORK INTERNATIONAL
SECTION 1
GENERAL
GENERAL DESCRIPTION
These compressors are applied to YORK Model YK
Centrifugal Liquid Chillers.
The compressor is a single-stage centrifugal type pow-
ered by an open-drive electric motor. The casing is fully
accessible with vertical circular joints and fabricated of
close-grain cast iron. The complete operating assembly
is removable from the compressor scroll housing. Com-
pressor castings are designed for 300 PSIG working
pressure and hydrostatically pressure tested at 900 PSIG.
The rotor assembly consists of a heat-treated alloy steel
drive shaft with a lightweight, high strength, cast alumi-
num, fully shrouded impeller. The impeller is designed
for balanced thrust and is dynamically balanced and
overspeed tested for smooth, vibration-free operation.
The insert type journal bearings are fabricated of alu-
minum alloy and are precision bored and axially grooved.
Thrust bearings are of the deflection-pad type design.
The specially engineered, single helical gears with
crowned teeth are designed so that more than one tooth
is in contact at all times to provide even distribution of
compressor load and quiet operation. Gears are inte-
grally assembled in the compressor rotor support and
are film lubricated. Each shaft is individually mounted
in its own journal and thrust bearings.
The open-drive compressor shaft seal consists of a
spring-loaded, precision carbon ring, high-temperature
elastomer “O” ring static seal, and a stress-relieved,
precision lapped collar. The seal features a small face
area and low rubbing speed. It provides an efficient seal
under high pressure conditions. The seal is oil-flooded
at all times and is pressure-lubricated during compres-
sor operation.
NOMENCLATURE
COMPRESSOR IDENTIFICATION
Each compressor is identified by nomenclature as shown.
The nomenclature is printed on a data plate which is
located on the side of the unit control panel. (See Fig. 1)
When contacting the factory or ordering renewal parts,
include the complete compressor model and serial num-
ber. Be sure these numbers are copied accurately.
29420A
YD H A 65
L H A 65
Impeller Size - 36, 41, 46, 50, 57, 61, 65, 73, 81, 90
Design Level (A - D)
High Pressure Refrigerant Compressor
Open-Drive
Close-Coupled D Flange Motor
YORK CODEPAK
™
®
LIQUID CHILLING SYSTEM
UNIT MODEL
REFRIG. DWP. PSIG:
LIQUID DWP. PSIG:
NO. OF PASSES:
SHELL TEST PRESS. PSIG:
REFRIGERANT REFRIG. CHARGE LBS.
CHARGED: FACTORY FIELD
STARTER SUPPLIED BY: FACTORY FIELD
FIELD SUPPLY:
VOLTS PHASE HERTZ
MIN. CIRCUIT AMPACITY
MAX.DUAL ELEMENT FUSE AMPS
MAX. CIRCUIT BREAKER AMPS
COMPRESSOR: MODEL CODE
SERIAL NO.
HP VOLTS-PHASE-HZ FLA
OIL PUMP
CHARGE WITHYORK REFRIGERANT OIL
SEE STARTER NAMEPLATE AND CONTROL
PANEL NAMEPLATE FOR ELECTRICAL DATA
COOLER CLG.
COND. H.R. COND.
FOR REMOTE STARTER SEEYORK STD.R
LD04750
FIG. 1 – COMPRESSOR IDENTIFICATION
1

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6
SECTION 2
COMPRESSOR SERVICE
The compressor is the heart of the chiller and every
effort should be made to maintain and keep it operating
at peak efficiency. Being a precision-built machine, it is
important to check the lubrication system for cleanli-
ness by changing the oil filter as mentioned under Pre-
ventative Maintenance in the Operating Instruction.
The compressor should not be disassembled for inspec-
tion purposes only. However, if the compressor fails to
function as outlined in the OPERATING MANUAL, it
may be necessary to do so. Individual parts are avail-
able for replacement as described in the following com-
pressor servicing section.
SERVICE GUIDELINES
The overhaul and replacement of parts of these com-
pressors, like any other mechanical operation on ma-
chinery, is best accomplished by experienced service
personnel using tools and measuring instruments to ac-
complish accuracy in their work.
There are a number of good practices that should be
followed in disassembly and reassembly of the com-
pressor; some of these are listed below.
Do Not Mix Parts – Keep parts in some general order
when removing them from the compressor. It is sug-
gested that parts be laid out to follow exploded views as
shown in the many illustrations outlining the disassem-
bly and assembly of the various parts.
Do Not Mix Cap Screws and Washers – Cap screws
are suited to the location in which they are used. Too
long or too short a cap screw can result in leakage
and/or interference with some interior parts. Wash-
ers have been selected for specific screws, etc. It is
very important to use correct washers or
lockwashers. The parts list and figures in this instruc-
tion show the correct length and size of screws and
washers. See the Renewal Parts Manual to order
the correct part numbers.
Inspect As Compressor is Disassembled – If pos-
sible, it is desirable to record shaft and impeller runouts
and thrust clearances before disassembly. Once com-
pressor parts have been disassembled and cleaned, many
valuable indications of the compressor condition are lost.
Materials found in oil or on burned surfaces can often
give an indication as to why a part or parts have failed.
Protect Parts and Surfaces – Do not pile or throw
parts indiscriminately. Oil surfaces likely to rust. Tape
surfaces subjected to scratching or nicking during re-
pair operations. Plug off any passages likely to accu-
mulate dust or abrasives. Do not tape the seals.
Clean Thoroughly – No compressor is completely over-
hauled if it is not cleaned internally to “new part” condi-
tion. Dirty parts can not be inspected or fitted and will
cause excessive wear when compressor is in operation.
CLEANING AND CHECKING WEARING PARTS
Before reassembling the compressor, all parts should
be thoroughly checked for excessive wear.
Worn parts should be replaced with new and each new
part should be thoroughly examined for shipping damage.
While the rotor support is open, carefully clean the inte-
rior, using an approved safety solvent and a lint free cloth.
Clean and check all oil passageways and all tubing.
Before assembling parts, all friction surfaces should be
lightly coated with a molybdenum disulfide lubricant
such as “Molykote” or “Molkolube” and oil. Be sure to
use new YORK refrigerant oil.
“Molkolube” is available from:
Dow Corning Corporation
Dept. A0021
P.O. Box 1767
Midland, Michigan
It is also available from YORK (Part No. 364-21508) in
2 oz. cans.
When reassembling parts, each part should be carefully
checked for signs of uneven wear, keeping in mind that
a nicely polished surface is not an indication of exces-
sive wear. Sudden, excessive wear on any part of the
compressor is not normal but is usually caused by some
other condition which must be determined and corrected
to assure long periods of trouble-free operation.
Bearings and seals may be reused if their rubbing sur-
faces and matching surfaces of their corresponding ro-
tating parts are nicely polished with no sign of uneven
wear or gouging.
The impeller should be checked around its outside cir-
cumference for evidence of rubbing. If this condition is
Compressor Service

FORM 160.49-M1
7
YORK INTERNATIONAL
found, excessive bearing wear is indicated, and the im-
peller may be worn sufficiently to require replacement.
All gaskets and “O” rings should be replaced with new
when reassembling the compressor to assure that all
surfaces have a tight seal after reassembly.
RIGGING THE COMPRESSOR OR MOTOR
When it becomes necessary to remove a compressor
or motor from a unit or base, proper rigging methods
must be used to avoid damage to the equipment and/or
injury to service personnel. Portable cranes must be of
adequate capacity and properly positioned and blocked
to prevent tipping or slipping while lifting the compres-
sor or motor. Be sure chains are of adequate strength.
Compressor weights are shown in Fig. 2 – Compressor
Weights (lbs.) – Less Motor. Motor weights are shown
in Fig. 3 – Motor Weights (lbs.). 2
FIG. 3 – MOTOR WEIGHTS (LBS)
LOW VOLTAGE
MOTOR CODE
60 HZ 50 HZ WEIGHTS
CH – 940
CJ 5CE 940
CK 5CF 1440
CL 5CG 1440
CM 5CH 1700
CN 5CI 1700
CP 5CJ 1700
CR 5CK 1700
CS 5CL 2635
CT 5CM 2635
CU 5CN 2635
CV 5CO 2635
CW 5CP 2930
CX 5CQ 2930
CY 5CR 2930
CZ 5CS 2930
CA 5CT 5750
CB 5CU 5750
DA 5CV 5750
DB 5CW 6800
DC 5CX 6800
– 5DA 7300
– 5DB 7300
HIGH VOLTAGE
MOTOR CODE
60 HZ 50 HZ WEIGHTS
CH – 2670
CJ 5CE 2670
CK 5CF 3100
CL 5CG 3100
CM 5CH 3100
CN 5CI 3100
CP 5CJ 3700
CR 5CK 3700
CS 5CL 3700
CT 5CM 3700
CU 5CN 3700
CV 5CO 4500
CW 5CP 4500
CX 5CQ 4500
CY 5CR 4500
CZ 5CS 4500
CA 5CT 5800
CB 5CU 5800
DA 5CV 5800
DB 5CW 6800
DC 5CX 6800
DD 5DA 7300
DE 5DB 7300
DF 5DC 7500
DH 5DD 7500
DJ 5DE 7900
– 5DF 7900
– 5DG 7900
– 5DH 7900
FIG. 2 – COMPRESSOR WEIGHTS (LBS.) - LESS MOTOR
COMPRESSOR COMPLETE ROTOR SUPPORT COMPLETE SCROLLASSEMBLY
CODE COMPRESSOR WITH ALL RUNNING GEAR WITH PRV HOUSING
P1, P2, P3, P4 2,450 1,500 950
G4, H0, H1, H2, H3, H4, H5, H6, H7, H8 3,500 2,250 1,300
J1 & J2 4,000 2,525 1,475
J3 & J4 5,000 3,150 1,775
FIG. 4 – TORQUE VALUES
BOLT SIZE TORQUE
INCHES POUND FOOT
HEX HD 10
1/4" 12PT OR 14
SOC HD
3/8" 35
1/2" 85
5/8" 200**
3/4" 300
Unless otherwise specified, all screws must be tightened to the
torque values at left with lightly oiled threads:
** Lubricated with oil and graphite on male and female threads and
under bolt heads. Molykote not acceptable.

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Compressor Service
SPECIAL TOOLS
Special tools are available as an option and will be furnished when ordered. These tools are listed in Figs. 5, 7, 9, 11
and 13. Use of the tools is shown in Fig. 6, 8, 10, 12 and 14.
FIG. 5 – COMPRESSOR TOOL KIT – 364K50048-000 (COMPRESSOR SIZES -39, -40, -42, -44)
FIG. 6 – USE OF COMPRESSOR TOOLS (-39, -40, -42, -44)
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
1 GEAR LOCKING TOOL 1 364-50212
2 SCREW CAP HEX .375 -16 2 021-01511
3 WASHER PLAIN .375 14 021-01262
4 HEX NUT .375 - 16 2 021-00467
5 GUIDE PIN #10 - 24 2 064-46488
6 EYE BOLT .3125 - 18 2 021-12420
7 WASHER PLAIN .3125 16 021-05166
8 GUIDE PIN .250 - 20 2 064-46499
9 HOOK TOOL 2 064-46610
10 GUIDE PIN .375 - 16 2 064-18716
11 STUD SPL .500 - 20 1 064-14500
12 HEX NUT .500 - 20 1 021-00483
13 EYE BOLT .875 1 021-07703
14 WASHER PLAIN .875 2 021-05158
15 EYE BOLT .375 - 16 3 021-13498
16 WASHER PLAIN .375 39 021-05167
17 SPACER 1 064-50213
18 SCREW CAP HEX .625 - 16 1 021-08389
19 TOOL SPACER 1 364-50210
20 PULLER TOOL 1 064-50211
21 SCREW CAP HEX .500 - 20 1 021-10832
22 SCREW CAP HEX .500 - 20 1 021-14162
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
LD06977

FORM 160.49-M1
9
YORK INTERNATIONAL
2
LD04753
FIG. 8 – USE OF COMPRESSOR TOOLS (-64, -73, -81, -90)
FIG. 7 – COMPRESSOR TOOL KIT 364-48026 (COMPRESSOR SIZES -65, -73, -81, -90)
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
12 HEX NUT - 1/2" HEAVY 1 021-00483
13 EYEBOLT - 7/8" 1 021-07703
14 WASHER, PLAIN - 7/8" 5 021-05158
15 EYE BOLT - 3/8" 3 021-13498
16 WASHER, PLAIN - 3/8" 11 021-05167
17 EYE BOLT - 5/16" 2 021-12420
18 WASHER, PLAIN - 5/16" 2 021-05166
19 PINION TOOL (Mod. 65 & 73) 1 064-48028
20 PINION TOOL (Mod. 50 & 57) 1 064-48029
21 PIPE 1 023-15508
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
1GEAR LOCKING TOOL 1 364-48023
2CAP SCREW - 5/8" 1 021-08389
3SPACER TOOL 1 364-48022
4CAP SCREW - 1/2" 2 021-08388
5WASHER, PLAIN - 1/2" 2 021-01276
6BAR TOOL 1 064-47031
7HEX NUT - 1/4" 4 021-00451
8GUIDE PIN 2 064-46499
9HOOK TOOL 2 064-46610
10 GUIDE PIN 3 064-18716
11 STUD 1 064-14500

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FIG. 9 – COMPRESSOR TOOL KIT 364-49275 (COMPRESSOR SIZES -46, -50, -57, -59, -61)
FIG. 10 – USE OF COMPRESSOR TOOLS (-46, -50, -57, -59, -61)
LD04749
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
1GEAR LOCKING TOOL 1 364-48023
2SCREW CAP HEX 1/2" 2 021-14249
3WASHER PLAIN 17/32" 14 021-01276
4NUT HEX HVY 1/2" 2 021-02860
5PIN GUIDE 2 064-46488
6BOLT EYE 5/16" 2 021-12420
7WASHER PLAIN 11/32" 16 021-05166
8PIN GUIDE 1/4-20UNC 2 064-46499
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
9HOOK TOOL 2 064-46610
10 PIN GUIDE 3/8" 2 064-18716
11 STUD SPECIAL 1 064-14500
12 NUT HEX HVY 1/2" 1 021-00483
13 BOLT EYE 7/8" 1 021-07703
14 WASHER PLAIN 15/16" 2 021-05158
15 BOLT EYE 3/8" 3 021-13498
16 WASHER PLAIN 13/32" 39 021-05167
Compressor Service

FORM 160.49-M1
11
YORK INTERNATIONAL
FIG. 12 – USE OF COMPRESSOR TOOLS (-41)
FIG. 11 – COMPRESSOR TOOL KIT 364-48145 (COMPRESSOR SIZE -41)
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
1GEAR LOCKING TOOL 1 364-48023
2SCREW CAP HEX - 5/8" 1 021-08389
3TOOL SPACER 1 364-48022
4SCREW CAP HEX 1/2" 2 021-08388
5WASHER PLAIN 17/32" 2 021-01276
6BAR TOOL 1 064-48345
7NUT HEX 4 021-00451
8PIN GUIDE 2 064-46499
9HOOK TOOL 2 064-46610
10 PIN GUIDE 3/8" 3 064-18716
11 STUD SPECIAL .500 1 064-14500
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
12 NUT HEX HVY 1/2" 1 021-00483
13 BOLT EYE 7/8" 1 021-07703
14 WASHER PLAIN 15/16" 5 021-05158
15 BOLT EYE 3/8" 3 021-13498
16 WASHER PLAIN 13/32" 11 021-05167
17 BOLT EYE 5/16" 2 021-12420
18 WASHER PLAIN 11/32" 2 021-05166
19 TOOL SPECIAL 1 064-48133
23 SEAL O-RING 7/16" 1 028-12551
25 ADAPTER 36-41 IMP 1 064-48282
26 PULLER TOOL 36-44 IMP 1 064-48281
LD04651
2

YORK INTERNATIONAL
12
FIG. 13 – COMPRESSOR TOOL KIT 364-48343 (COMPRESSOR SIZE -61)
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
1GEAR LOCKING TOOL 1 364-48023
2SCREW CAP HEX - 5/8" 1 021-08389
3TOOL SPACER 1 364-48022
4SCREW CAP HEX 1/2" 2 021-08388
5WASHER PLAIN 17/32" 2 021-01276
6BAR TOOL 1 064-48345
7NUT HEX 1/4" 4 021-00451
8PIN GUIDE 1/4" 2 064-46499
9HOOK TOOL 2 064-46610
10 PIN GUIDE 3/8" 3 064-18716
ITEM DESCRIPTION QTY. PART NO.
NO. PER KIT
11 STUD SPECIAL .500 1 064-14500
12 NUT HEX HVY 1/2" 1 021-00483
13 BOLT EYE 7/8" 1 021-07703
14 WASHER PLAIN 15/16" 5 021-05158
15 BOLT EYE 3/8" 3 021-13498
16 WASHER PLAIN 13/32" 11 021-05167
17 TOOL SPECIAL 1 064-48133
18 SEAL O-RING 7/16" 1 028-12551
20 ADAPTER IMPR 1 064-48318
21 *I* PULLER TOOL 1 064-48342
FIG. 14 – USE OF COMPRESSOR TOOLS (-61)
LD04752
Compressor Service

FORM 160.49-M1
13
YORK INTERNATIONAL
MOTOR REMOVAL AND REPLACEMENT
Be sure the main disconnect switch to the compressor
motor is open and tagged, then disconnect the electrical
leads at the motor terminals and tape the end of each
lead. Make sure leads are marked correctly for later
identification.
REMOVAL (MOTOR ONLY)
The following paragraphs outline the procedure for re-
placing or servicing the motor. Always contact the near-
est YORK District Service Office when replacing or
servicing the motor.
Close-Coupled Models
1. Support the weight of the motor from a hoist using
eyebolts at locations provided in the motor housing.
2. Remove the hex head cap screws that hold the sheet
metal covers to the compressor motor adapter. Af-
ter all screws are removed, remove covers. (See
Fig. 15)
3. Remove the internal coupling guard. The internal
coupling guard is fastened to the compressor with
(4) hex head cap screws. (See Fig. 16)
4. Remove the bolts holding the coupling hubs to the
coupling spool and the disc pack. Note arrangement
of these parts. (See Fig. 17). Remove the coupling
spool and disc packs.
5. Taking care to see that the motor is properly sup-
ported, remove the bolts that hold the motor to the
motor adapter.
6. Remove the bolts, nuts, and washers holding the
motor to the mounting rails. Note location of any
shims.
7. Lift the motor and pull it away from the compres-
sors. Lower motor to floor for servicing. Remove
shims from motor mounting rails.
Open-Drive Models
1. Remove the coupling guard. (See Fig. 18)
2. Remove the bolts holding the coupling hubs to the
coupling spool and the disc pack. Note arrangement
of these parts. (See Fig. 17). Remove the coupling
spool and disc packs.
3. Remove the bolts, nuts and washers holding the
motor to the mounting rails. Note location of any
shims.
4. Prior to performing Step 5, be sure to support the
back end of the rotor support.
5. Taking care to see that the motor is properly sup-
ported, remove the bolts that hold the motor to the
motor adaptor.
6. Lift the motor and pull it away from the compres-
sor. Lower motor to floor for servicing. Remove
shims from motor mounting rails.
FIG. 15 – MOTOR ADAPTER
FIG. 16 – INTERNAL COUPLING GUARD
FIG. 17 – COMPRESSOR COUPLING
COVER
MOTOR ADAPTER
25718A
LD04754
LD04755
2

YORK INTERNATIONAL
14
INSTALLATION
Close-Coupled Models
1. Place the number of shims originally required on
each motor mounting rail.
2. Lift motor to the proper location and push motor
carefully against the compressor motor adapter.
3. Line up holes in the face of the motor with the holes
in the compressor motor adapter. Place the hex head
cap screws through the compressor motor adapter
and screw into the tapped holes on the motor, (but
do not fully tighten screws). (See Fig. 15)
4. Place the hex head cap screws and washers in holes
in motor feet. Make sure the motor is shimmed cor-
rectly. Place hex nuts on screws and tighten and
torque.
5. Tighten and torque screws holding motor-to-motor
adapter.
6. Assemble the coupling. Refer to Form 160.49-N4.
Open-Drive Models
1. Place the number of shims originally required on
each motor mounting channel.
2. Lift motor to its proper location on the motor mount-
ing channels. Fasten with cap screws, washers, and
hex nuts.
3. Assemble the coupling. Refer to Form 160.49-N4.
4. Re-assemble the coupling guard.
Before opening any part of the
compressor, the compressor must be
pumped down to atmospheric
pressure.
SHAFT SEALS
Shaft seals applied to these compressors are of two dif-
ferent designs. Original design compressors used a car-
bon ring cartridge type shaft seal. This design is shown in
Figs. 19 - 23; procedures for removal and installation are
shown on pages 14 & 15. Beginning approximately May
1998, compressors are equipped with a bellows-type shaft
seal. This seal is shown in Fig. 29; procedures for re-
moval and installation are shown on pages 16 & 17.
Removal (Cartridge Type Seal)
To remove/replace the cartridge type shaft seal, pro-
ceed as follows:
1. Remove compressor coupling as described on pre-
vious pages under MOTOR REMOVAL AND
REPLACEMENT. Also remove the compressor
coupling hub from the compressor shaft.
2. Remove the oil drain line from the bottom of the
shaft seal cover plate. (See Fig. 20)
3. Remove the (8) cap screws holding the cover plate
and remove the cover plate. The stationary carbon
seal will remain in the cover plate as it is removed.
Do not touch the carbon seal surface.
4. Remove the snap ring and sleeve.
5. Remove the seal cartridge assembly from the cover
plate. Do not disassemble the cartridge assembly.
6. Using items from the tool kit as shown in Fig. 21
remove the seal collar from the shaft. (also see Figs.
22 and 23)
COUPLING GUARD
26296A
FIG. 18 – COUPLING GUARD (OPEN-DRIVE MODELS)
CARBON SEAL
CARTRIDGE
ASSEMBLY
(STATIONARY)
FIG. 19 – CARTRIDGE TYPE SHAFT SEAL CROSS
SECTION
26439A
SLEEVE
SNAP
RING
COVER
PLATE
DRAIN TUBE
“O” RING
SEAL
COLLAR
“O” RING
Compressor Service

FORM 160.49-M1
15
YORK INTERNATIONAL
Installation (Cartridge Type Seal)
1. Be sure the shaft seal cavity is absolutely clean by
cleaning it with an approved safety solvent and blow-
ing it dry with compressed air.
2. Inspect all wearing surfaces and replace parts as
necessary. See “Cleaning And Checking Wear-
ing Parts”, page 6. Discard all “O” rings and re-
place with new.
3. Slide the seal collar onto the compressor shaft. Be
sure it is positioned with the lapped surface facing
out. (See Fig. 22)
4. Re-install the cover plate and seal cartridge assem-
bly. Use care so that the carbon seal is not
damaged.
5. Re-install the sleeve and secure it with the snap
ring.
6. Re-connect the oil drain line and re-install the com-
pressor coupling if no further service is planned.
FIG. 23 – CARTRIDGE TYPE SHAFT SEAL
COMPONENTS
“O” RING
SEAL
COLLAR
CARBON
SEAL
CARTRIDGE “O” RING
SNAP
RING
RETAINER
SLEEVE
SEAL
COVER
PLATE “O” RING
26349A
FIG. 20 – SHAFT SEAL COVER PLATE
FIG. 21 – SEAL REMOVAL
FIG. 22 – SEAL PLATE
26350A
SEAL
COLLAR
HOLES FOR PULLER RODS
LD04762
COVER PLATE DRAIN TUBE
26354A
2

YORK INTERNATIONAL
16
O-RING
SHAFT SEAL
Seal Removal (Bellows Type)
To remove/replace the bellows type shaft seal, proceed
as follows:
1. Remove compressor coupling as described on pre-
vious pages under MOTOR REMOVAL AND
REPLACEMENT. Also remove the compressor
coupling hub from the compressor shaft.
2. Remove the oil drain line.
3. Loosen the two set screws (C) shown in Fig. 24.
4. Remove the flat head screws and re-attach the re-
taining clips in the Installation position.
BELLOWS TYPE SEALS
There are 2 versions of the bellows type
shaft seals used on compressors manu-
factured after May of 1998. One ver-
sion is used on the HA and HB family
of compressors and the second version
is used on the HD and HF family of
compressors. The HA and HB seal has
a separate sleeve spacer and C-ring
that needs to be manually inserted be-
fore installing the seal assembly. The
HD and HF version have the sleeve
spacer and C-ring already installed in
the seal. Below are instructions on
how to remove and install these seals.
It is important that the shaft seal
sleeve is securely attached to the com-
pressor shaft prior to removal of the
retaining clips. These clips protect the
seal internals from harm during the
assembly process and insure the proper
positioning of the shaft seal for proper
seal face loading. Anytime a seal
cartridge is outside the compressor, the
retaining clips need to be in their
Installation position.
5. Loosen the 4 set screws (B) shown in Fig. 24.
6. Remove the 8 hex head screws holding the shaft
seal to the compressor housing.
7. Using guide pins, carefully remove the seal assem-
bly from the rotor support.
8. Remove the C-ring and sleeve spacer from com-
pressor shaft on HA and HB style compressors.
9. Remove the O-ring from the rotor support housing.
Seal Installation (Bellows Type)
1. Be sure the shaft seal cavity is absolutely clean by
cleaning it with an approved safety solvent and blow-
ing it dry with compressed air.
2. Inspect all wearing surfaces and replace parts as
necessary. See “Cleaning And Checking Wear-
ing Parts”, page 6. Discard all O-rings and replace
with new.
FIG. 24 – BELLOWS TYPE SHAFT SEAL
LD04759
Compressor Service

FORM 160.49-M1
17
YORK INTERNATIONAL
3. Thoroughly lubricate shaft with clean YORK re-
frigerant oil prior to installation. For HD and HF
compressors, proceed to Step 6.
4. Install the sleeve spacer on the shaft and slide it all
the way onto the shaft.
5. Thoroughly lubricate C-ring with clean YORK re-
frigerant oil. Install the C-ring with the open side of
the ring facing the compressor.
Care needs to be taken when install-
ing the C-ring to prevent damage to
the ring on any burrs on the shaft or
on the snap ring grove that may be on
the shaft of older compressors.
6. Install the shaft seal cover o-ring in the rotor sup-
port housing.
7. Using guide studs install the seal cartridge in the
rotor support housing and secure it with the existing
3/8" mounting screws.
8. Before tightening the shaft seal sleeve set screw,
rotate the compress shaft to insure that the set
screws straddle the shaft keyway.
9. Without removing the two shaft seal sleeve retain-
ing clips, tighten the four accessible set screws to
the compressor shaft.
10. Remove the retaining clips and tighten the remain-
ing setscrews. Torque all six setscrews to 60 inch
pounds. Install retaining clips in the Operating Posi-
tion on seal face.
11. Re-connect the oil drain line and re-install the com-
pressor coupling if no further service is planned.
DISASSEMBLY OF ROTOR SUPPORT
The following paragraphs outline the procedure for sepa-
rating the rotor support from the rotor scroll if it be-
comes necessary to service internal parts:
Removing the Rotor Supports from Rotor Scroll
For steps 1 thru 4 follow procedures
listed on previous pages of this in-
struction.
1. Remove the compressor coupling.
2. Remove all external piping from the rotor support.
3. Using proper rigging techniques, temporarily sup-
port the weight of the back end of the rotor support.
4. Taking care that the motor is properly supported,
remove the bolts that hold the motor to the motor
adaptor. Remove the motor from the chiller and sit
away from work area. See “Motor Removal and
Replacement” described on page 13. DO NOT
remove the motor adaptor from the compressor.
5. Insert eyebolt into the top of the rotor support and
using proper rigging methods support the weight of
the rotor support.
6. Remove (2) of the 12 point cap screws holding the
rotor support to the rotor scroll. Insert guide pins in
place of the (2) cap screws.
7. Loosen the remaining cap screws. Do not remove
the (2) set screws/studs with nuts from the bottom
of the flange near the drain pipe. Remove the nuts
only.
On the HF family of compressors it
may be necessary to temporarily rig a
support for the oil sump. The sumps
on these compressors are not attached
to the shell.
8. Use (3) of the cap screws as jacking screws in the
tapped holes provided to loosen the rotor support
from the rotor scroll. (See Fig. 25) Carefully pull
the rotor support out of the rotor scroll. Rotate the
shaft by hand when removing the rotor support to
prevent damage to the impeller inlet seal ring.
9. The rotor support can now be removed and rested
on the end of the motor adapter.
REMOVING THE IMPELLER (size 46 & larger)
(See Fig. 26)
1. Before removing the impeller, measure and record
the following. (See Fig. 27) Position compressor so
that it is sitting on the correct horizontal plane to
assure correct readings.
a. Impeller rim Runout (Design 0.003" max.)
b. Impeller eye Runout (Design 0.002" max.)
c. High Speed Axial thrust (Design 0.008"
to 0.021”)
d. Low Speed Axial Thrust (Design 0.011"
to 0.019")
2. Install the gear locking tool on the low-speed shaft.
(See Fig. 52)
3. Remove the 3 (or 6) screws that hold the impeller
to the high-speed shaft. (See Fig. 28) Pull the im-
peller from the high-speed shaft. Use care when
removing the impeller so that the balance piston seal
is not damaged.
2

YORK INTERNATIONAL
18
FIG. 25 – DISASSEMBLY OF ROTOR SUPPORT FROM THE ROTOR SCROLL
ROTOR SUPPORT
ROTOR SCROLL
26439BA
FIG. 26 – IMPELLER AND BALANCE PISTON (IMPELLER SIZES 46 AND LARGER)
DIFFUSER PLATE
BALANCE PISTON
RETAINER
SOCKET HEAD CAP
SCREWS (3)
IMPELLER
CAP SCREWS (3 OR 6)
IMPELLER CLAMPING COLLAR
HIGH-SPEED SHAFT
BALANCE PISTON SEAL
COIL SPRINGS (8)
26439A
Compressor Service

FORM 160.49-M1
19
YORK INTERNATIONAL
FIG. 27 – CHECKING IMPELLER TOLERANCES
DETAIL A – CHECKING RIM RUNOUT
(TOLERANCE - .003")
26347A
DETAIL B – CHECKING EYE RUNOUT
(TOLERANCE - .002")
26346A
DETAIL C – CHECKING AXIAL THRUST 00588VIP
REMOVING THE IMPELLER
(HA36 & HA41 Compressors) (See Figs. 29 & 30)
1. Before removing the impeller, measure and record
the following: (See Fig. 27) Position compressor so
that it is sitting on the correct horizontal plane to
assure correct readings.
a. Impeller rim Runout (Design 0.003" Max.)
b. Impeller eye Runout (Design 0.002" Max.)
c. High Speed Axial thrust (Design 0.008"
to 0.021")
d. Low Speed Axial Thrust (Design 0.011"
to 0.019")
FIG. 28 – REMOVING IMPELLER
(IMPELLER SIZES 46 AND LARGER)
26345A
CAP SCREWS IMPELLER
IMPELLER CLAMPING
COLLAR
FIG. 29 – IMPELLER MOUNTING
(IMPELLER SIZES 36 & 41)
IMPELLER
IMPELLER
CLAMPING
COLLAR
CAP SCREW
AND
“O” RING
O-RING
26439A
2

YORK INTERNATIONAL
20
REMOVING THE IMPELLER (HF COMPRESSORS)
1. Before removing the impeller, measure and record
the following. (See Fig. 27) Position compressor so
that it is sitting on the correct horizontal plane to
assure correct readings
a. Impeller rim Runout (Design 0.003" Maximum)
b. Impeller eye Runout (Design 0.002" Maximum)
c. High Speed Axial thrust (Design 0.009"
to 0.020")
d. Low Speed Axial Thrust (Design 0.011"
to 0.019")
2. Install the gear locking tool on the low-speed shaft.
(See Fig. 52)
3. Remove the cap screw from the impeller.
Install Puller Plate and Puller Tool, found in the tool
kit, onto the impeller. Apply a wrench to the puller
to remove the impeller clamping color.
Considerable torque will have to be
applied to the wrench in order to re-
move the impeller-clamping collar.
REMOVING BALANCE PISTON SEAL AND DIFFUSER
PLATE
1. Remove the (3) socket head cap screws (shoulder
bolts) that fasten the balance piston retainer and
balance piston seal the to diffuser plate. (See Fig.
32 and 33)
2. Remove (2) of the (6) cap screws that secure the
diffuser plate to the bearing housing. Insert guide
pins where cap screws were removed. Loosen the
(4) remaining cap screws. (See Fig. 34) Insert jack-
ing screws into holes to loosen diffuser plate from
bearing housing.
3. Insert eyebolts from tool kit into jacking holes and
use proper rigging methods to lift diffuser plate from
compressor. Also remove o-ring from back of dif-
fuser plate.
Original design balance piston seal on
HA, HB, and HD style compressors
were equipped with (8) coil springs.
Current design on these compressors
use (16) coil springs. On the HF style
compressor the balance piston seal
uses a flat spring washer in place of
the coil springs. (See Fig. 35 - HF style
Balance Piston Seal Assembly)
2. Install the gear locking tool on the low-speed shaft.
(See Fig. 52)
3. Remove the cap screw and O-ring from the impel-
ler-clamping collar.
4. Mechanical Method – Install the adaptor and puller
tool, found in the tool kit, as shown in Fig. 30. Apply
a wrench to the puller tools to remove the impeller
clamping collar.
Considerable torque will have to be
applied to the wrench in order to re-
move the impeller-clamping collar.
4a. Hydraulic Method – Install the hydraulic removal
tool, found in the tool kit, as shown in Fig. 31. Con-
nect a source of hydraulic pressure (5000 PSI mini-
mum) to the head of the removal tool (1/8" NPT).
Carefully and gradually apply hydraulic pressure until
the clamping collar is loosened.
5. Pull the impeller from the high speed shaft. Use
care when removing the impeller so that the bal-
ance piston seal is not damaged.
"O" RING HYDRAULIC
TOOL
FIG. 31 – REMOVING THE IMPELLER
(IMPELLER SIZES 36 & 41)
LD04761
ADAPTER
PULLER TOOL
FIG. 30 – REMOVING THE IMPELLER
(IMPELLER SIZES 36 & 41)
LD04760
Compressor Service