York YCAQ10 User manual

INSTALL., OPER., MAIN.
PACKAGED LIQUID CHILLERS
AIR COOLED – RECIPROCATING HERMETIC
Supersedes: 150.40-NM20 (587) Form 150.40-NM20 (597)
MODELS YCAQ10, YCAM12, YCAK14, YCAKI16, YCAG18
YCAR11, YCAN13, YCAL15, YCAJ17 & YCAH19
ALSO
MODELS YCH100, 120, 150, 175, & 200
STYLE C*
00004TG
*WITH MICROPROCESSOR CONTROL PANEL
WITH G.E. II. 4 EPROM (MODEL YCHA100)
WITH G.E. II. 3 EPROM (MODELS YCHA120 THRU 200)
WITH G.E. II. 5 EPROM (MODELS YCHA120 THRU 200)
(See page 2 for further clarifications)

YORK INTERNATIONAL
2
YCHA YCHA120,
100 150, 175, 200
Unit Identification ............................................................. 2 2
General Information ......................................................... 3 3
Dimensions ...................................................................... 4 5
Electrical Data.................................................................. 6 6
Physical Data ................................................................... 8 8
Installation........................................................................ 9 9
Unit Controls and Operation ............................................ 12 36
Wiring Diagram................................................................ 20 44
Start-Up ........................................................................... 26 50
Operating Sequence ........................................................ 27 51
Preventive Maintenance .................................................. 33 60
Trouble-Shooting Chart.................................................... 34 61
Service Bulletins .............................................................. 67 67
TABLE OF CONTENTS
UNIT IDENTIFICATION
EffectiveMay 1,1987, YORK introduced anew method
of unit identification (nomenclature). The new method
of identification does not reflect any change in unit de-
sign; only a change in nomenclature. This manual is
written based on the nomenclature used before May l,
1987. However, it is also fully applicable to units built
after May 1, 1987 which are identified by the later no-
menclature.Adescription of bothnomenclaturesis given
below. Also a cross-reference chart of models is pro-
vided for your convenience.
CROSS REFERENCE CHART
NOMENCLATURE
Before May 1, 1987 Effective May 1, 1987
YCHA100 YCA Q 10,YCA R 11
YCHA120 YCA M 12,YCA N 13
YCHA150 YCA K 14, YCA L 15
YCHA175 YCA I 16, YCA J 17
YCHA200 YCA G 18,YCA H 19
UNIT NOMENCLATURE (Before May 1, 1987)
Y C H A 175 - 28 C Design Series
Voltage Code:
17 = 200-3-60
28 = 230-3-60
40 = 380-3-60
46 = 460-3-60
50 = 380/415-3-50
64 = 346-3-50
Capacity Tons
100, 120, 150, 175, 200
Air Cooled
Hermetic
Chiller
YORK
Effective May 1, 1987
Y C A Q 10 46 C Design Series
Voltage Code:
17 = 200-3-60
28 = 230-3-60
40 = 380-3-60
46 = 460-3-60
50 = 380/415-3-50
64 = 346-3-50
Condenser Code
10, 11, 12, 13, 14, 15,
16, 17, 18, 19
Cooler Code
Q,R,M,N,K,L,I,J, G, H
Air Cooled
YORK Chiller

FORM 150.40-NM20
3
YORK INTERNATIONAL
GENERAL INFORMATION
GENERAL DESCRIPTION
TheYCHA packaged liquid chillers are completely self-
contained outdoor units shipped ready for final job
installationrequiring only liquidconnections, power and
control wiring. They are designed primarily for central
station air conditioning applications with normal instal-
lations being on roof-tops or on ground level beside the
building.
CODE STATUS
Theunits aredesigned inaccordance withN.E.C., ANSI
B9.1, and ASME Codes.
OPERATING LIMITATIONS
LEAVING LIQUID MIN. 40
TEMP., °F MAX. 50
AIR ON MIN. 35*
CONDENSER, °F MAX. 130
UNIT COOLER
MODEL WATER GPM
YCHA MIN. MAX.
100 120 550
120 120 580
150 120 580
175 150 640
200 200 700
* 0°F With Optional Low Ambient Kit.
NOTE: The evaporator is protected against freeze-up to - 20°F with
an electrical heater cable.
COMPRESSOR NOMENCLATURE
Compressor Series
Single Stage
No. of Active Cylinders
(4,6,&8)
Stroke (3, 4)
Design Level (E)
Motor Size (M,N,Q,P,S,T)
Voltage Code:
17= 200-3-60
28 = 230-3-60
40 = 380-3-60
46 = 460-3-60
50 = 380/415-3-50
64 = 346-3-50
Motor Manufacturer
(A=A.O.Smith,G=G.E.)
J S 4 3 E M -17 G
TABLE 1 – VOLTAGE LIMITATIONS
LD01773
FIG. 1 – COOLER WATER PRESSURE DROP
VOLTAGE OPTIMUM MIN. MAX.
CODE VOLTAGES VOLTS VOLTS
17 200-3-60 180 220
28 230-3-60 207 253
40 380-3-60 355 415
46 460-3-60 414 506
50 380/415-3-50 342 440
64 346-3-50 311 381

YORK INTERNATIONAL
4
LD01774
NOTES:
1. Clearances – Minimum YORK required clearances to prevent condenser air recirculation and faulty operation of units are as follows:
Side to wall 8'–0"* Rear to wall 8'–0"* Control Panel End to wall 5'–0"* Top 50'–0"* Distance Between Adjacent units 12'–0"
* No more than one wall can be higher than the top of the unit. The area within the clearances shown above and area under the unit must
be kept clear of all obstructions that would impede free air flow to the unit. In installations where winter operation is intended and snow
accumulations are expected, additional unit height must be provided to insure full air flow.
2. Cooler liquid connection sizes (inlet & outlet) 6" victaulic standard (flanges OPTIONAL).
3. Dimensions are in inches.
4. Spring Isolators (OPTIONAL) will increase overall height of unit.
DIMENSIONS YCHA100

FORM 150.40-NM20
5
YORK INTERNATIONAL
LD01775
NOTES:
1. Clearances – Minimum York required clearances to prevent condenser air recirculation and faulty operation of units are as follows: Side
to wall 8'–0"* Rear to wall 8'–0"* Control Panel End to wall 5'–0"* Top 50'–0" Distance Between Adjacent units 12' – 0"
No more than one wall can be higher than the top of the unit. The area within the clearances shown above and area under the unit must
be kept clear of all obstructions that would impede free air flow to the unit. In installations where winter operation is intended and snow
accumulations are expected, additional unit height must be provided to insure full air flow.
2. Cooler liquid connection sizes (inlet & outlet) 6" victaulic for the YCHA120-175, 8" victaulic for the YCHA200 (flanges OPTIONAL).
3. Dimensions are in inches.
4. Spring Isolators (OPTIONAL) will increase overall height of unit.
DIMENSIONS YCHA120, 150, 175, 200

YORK INTERNATIONAL
6
2Maximum wire size that can be accommodated by unit wiring lugs. Actual wire size must be determined based on ampacity and job
requirements using NEC wire sizing information.
ELECTRICAL DATA
POWER SUPPLY
SYSTEM NO. 1 SYSTEM NO. 2
NON-FUSED NON-FUSED
MODEL POWER MIN. MAX. DISC. INCOMING MIN. MAX. DISC. INCOMING
YCHA CIRCUIT DUAL SWITCH WIRE CIRCUIT DUAL SWITCH WIRE
AMP. FUSE SIZE RANGE2AMP. FUSE SIZE RANGE2
VOLTS-PH-Hz AAVCU/AL WIRE A AV CU/AL WIRE
-17 200-3-60 520 800 600 240 (1) #4-500MCM ———— —
-28 230-3-60 460 700 600 240 (1) #4-500MCM ———— —
100 -40 380-3-60 272 400 400 480 (1) #6-300MCM ———— —
-46 460-3-60 230 350 400 480 (1) #6-300MCM ———— —
-50 380/415-3-50 280 400 400 480 (1) #6-300MCM ———— —
-64 346-3-50 319 450 400 480 (1) #4-500MCM ———— —
-17 200-3-60 282 400 400 240 (1) #4-500MCM 379 600 400 240 (1) #4-500MCM
-28 230-3-60 247 350 400 240 (1) #4-500MCM 336 500 400 240 (1) #4-500MCM
120 -40 380-3-60 147 225 200 480 (1) #14-2/0AWG 198 300 200 480 (1) #14-2/0AWG
-46 460-360 125 200 200 480 (1) #14-2/0AWG 168 250 200 480 (1) #14-2/0AWG
-50 380/415-3-50 149 225 200 480 (1) #14-2/0AWG 206 300 200 480 (1) #14-2/0AWG
-64 346-3-50 162 250 200 480 (1) #6-300MCM 225 350 400 480 (1) #6-300MCM
-17 200-360 386 600 400 240 (1)#4-500MCM 386 600 400 240 (1)#4-500MCM
-28 230-3-60 343 500 400 240 (1) #4-500MCM 343 500 400 240 (1) #4-500MCM
150 -40 380-3-60 203 300 200 480 (1) #14-2/0AWG 203 300 200 480 (1) #14-2/0AWG
-46 460-3-60 172 250 200 480 (1) #14-2/0AWG 172 250 200 480 (1) #14-2/0AWG
-50 380/415-3-50 210 300 200 480 (1) #14-2/0AWG 210 300 200 480 (1) #14-2/0AWG
-64 346-3-50 230 350 400 480 (1) #6-300MCM 230 350 400 480 (1) #6-300MCM
-17 200-360 399 600 400 240 (1)#4-500MCM 517 800 600 240 (1)#4-500MCM
-28 230-3-60 353 500 400 240 (1) #4-500MCM 456 700 600 240 (1) #4-500MCM
175 -40 380-3-60 209 300 200 480 (1) #6-300MCM 272 400 400 480 (1) #6-300MCM
-46 460-3-60 177 250 200 480 (1) #6-300MCM 228 350 400 480 (1) #6-300MCM
-50 380/415-3-50 215 300 200 480 (1) #6-300MCM 277 400 400 480 (1) #6-300MCM
-64 346-3-50 235 350 400 480 (1) #4-500MCM 316 450 400 480 (1) #4-500MCM
-17 200-3-60 520 800 600 240 (1) #4-500MCM 520 800 600 240 (1) #4-500MCM
-28 230-3-60 460 700 600 240 (1) #4-500MCM 460 700 600 240 (1) #4-500MCM
200 -40 380-3-60 272 400 400 480 (1) #6-300MCM 272 400 400 480 (1) #6-300MCM
-46 460-3-60 230 350 400 480 (1) #6-300MCM 230 350 400 480 (1) #6-300MCM
-50 380/415-3-50 280 400 400 480 (1) #6-300MCM 280 400 400 480 (1) #6-300MCM
-64 346-3-50 319 450 400 480 (1) #4-500MCM 319 450 400 480 (1) #4-500MCM
MAX. DUAL NON-FUSED
MODEL VOLTS-PH-Hz MIN. CIR. ELEM. FUSE DISCONNECT INCOMING
AMPACITY ASWITCH WIRE RANGE
AV
-40 380-3-60 320 400 400 480
YCHA120 -46 460-3-60 271 350 400 480
-50 380/415-3-50 329 450 400 480
-40 380-3-60 370 450 400 480
YCHA150 -46 460-3-60 312 400 400 480 (1)#1/0-600MCM
-50 380/415-3-50 383 500 400 480 or
-40 380-3-60 444 600 600 480 (2)#1/0-250MCM
YCHA175 -46 460-3-60 374 500 400 480 CU/AL
-50 380/415-3-50 454 600 600 480
-40 380-3-60 494 600 600 480
YCHA200 -46 460-3-60 419 500 600 480
-50 380/415-3-50 509 700 600 480
p
p
SINGLE POINT POWER WIRING (OPTIONAL)

FORM 150.40-NM20
7
YORK INTERNATIONAL
CONTROL SUPPLY WITH LOAD RATINGS
TRANSFORMER SYSTEM NO. 1 SYSTEM NO. 2
MAX. DUAL NON-FUSED COMPRESSOR CONDENSER COMPRESSOR CONDENSER
MIN. ELEM. DISC. LOAD FAN LOADS LOAD FAN LOADS
CIR. FUSE SWITCH SZ.
AMP. PW- TRIP PW- TRIP
AVAVRLA
LRA AMPS3NO HP KW FLA RLA LRA AMPS3NO HP KW FLA
15 15 250 30 240 380 1311 501.9 4 3 2.2 11.4 — — — — — — —
15 15 250 30 240 332 1212 445.6 4 3 2.2 11.4 — — — — — — —
8 8 600 30 480 199 733 264.4 4 3 2.2 5.8 — — — — — — —
8 8 600 30 480 166 606 219.5 4 3 2.2 5.7 — — — — — — —
8 8 600 30 480 204 760 272.4 4 3 2.2 6.2 — — — — — — —
8 8 600 30 480 234 897 314.6 4 3 2.2 6.6 — — — — — — —
15 15 250 30 240 198 665 262.7 3 3 2.2 11.4 267 950 363.0 4 3 2.2 11.4
15 15 250 30 240 170 602 224.9 3 3 2.2 11.4 232 826 314.6 4 3 2.2 11.4
8 8 600 30 480 104 364 139.0 3 3 2.2 5.8 140 500 192.5 4 3 2.2 5.8
8 8 600 30 480 86 301 116.2 3 3 2.2 5.7 116 413 159.4 4 3 2.2 5.7
8 8 600 30 480 104 400 139.0 3 3 2.2 6.2 145 590 197.1 4 3 2.2 6.2
8 8 600 30 480 114 450 149.2 3 3 2.2 6.6 159 700 216.8 4 3 2.2 6.6
15 15 250 30 240 272 950 363.0 4 3 2.2 11.4 272 950 363.0 4 3 2.2 11.4
15 15 250 30 240 238 826 314.6 4 3 2.2 11.4 238 826 314.6 4 3 2.2 11.4
8 8 600 30 480 144 471 192.5 4 3 2.2 5.8 144 471 192.5 4 3 2.2 5.8
8 8 600 30 480 119 413 159.4 4 3 2.2 5.7 119 413 159.4 4 3 2.2 5.7
8 8 600 30 480 148 590 197.1 4 3 2.2 6.2 148 590 197.1 4 3 2.2 6.2
8 8 600 30 480 163 700 216.8 4 3 2.2 6.6 163 700 216.8 4 3 2.2 6.6
15 15 250 30 240 283 950 376.5 4 3 2.2 11.4 377 1311 501.9 4 3 2.2 11.4
15 15 250 30 240 246 826 325.9 4 3 2.2 11.4 328 1212 445.6 4 3 2.2 11.4
8 8 600 30 480 149 471 197.1 4 3 2.2 5.8 199 733 264.4 4 3 2.2 5.8
8 8 600 30 480 123 413 162.6 4 3 2.2 5.7 164 606 219.5 4 3 2.2 5.7
8 8 600 30 480 152 590 201.8 4 3 2.2 6.2 202 760 272.4 4 3 2.2 6.2
8 8 600 30 480 167 700 224.9 4 3 2.2 6.6 232 897 314.6 4 3 2.2 6.6
15 15 250 30 240 380 1311 501.9 4 3 2.2 11.4 380 1311 501.9 4 3 2.2 11.4
15 15 250 30 240 332 1212 445.6 4 3 2.2 11.4 332 1212 445.6 4 3 2.2 11.4
8 8 600 30 480 199 733 264.4 4 3 2.2 5.8 199 733 264.4 4 3 2.2 5.8
8 8 600 30 480 166 606 219.5 4 3 2.2 5.7 166 606 219.5 4 3 2.2 5.7
8 8 600 30 480 204 760 272.4 4 3 2.2 6.2 204 760 272.4 4 3 2.2 6.2
8 8 600 30 480 234 897 314.6 4 3 2.2 6.6 234 897 314.6 4 3 2.2 6.6
ELECTRICAL DATA
The above recommendations are based on the National Electrical Code. Field wiring must also comply with local codes.
3 Current Overload Setting – Protects motor by stopping unit if compressor motor current exceeds values shown.
LEGEND
A = Amps
AMP. = Ampacity
HZ = Hertz
HP = Horsepower
PH = Phase
V = Volts
RLA = Running Load Amps
FLA = Full Load Amps
PW = Part Wind

YORK INTERNATIONAL
8
MODEL YCHA 100 120 150 175 200
60 Hz 94.2 118.8 140.3 167.4 191.3
TONS150 Hz 93.8 121.0 141.2 167.5 190.5
60 Hz 115.2 138.2 162.1 198.3 232.7
COMPRESSOR KW150 Hz 115.8 141.3 166.6 200.7 234.0
NO. OF REFRIG. CIRCUITS 12 22 2
COMPRESSOR
60 HZ Sys. 1 JS83E-S JS43E-M JS63E-P JS63E-P JS83E-S
Sys. 2 — JS63E-P JS63E-P JS83E-S JS83E-S
MODEL 50 HZ Sys. 1 JS84E-T JS44E-P JS64E-S JS64E-S JS84E-T
Sys. 2 — JS64E-S JS64E-S JS84E-T JS84E-T
Sys. 1
Lead 100,75,50,25 100,60,40,20 100,67,50,17 100,71,43,14 100,75,50,25
STD. Sys. 2
CAPACITY Lead —100,80,60,20 100,67,50,17 100,71,57,29 100,75,50,25
CONTROL Sys. 1 —100,83,67, 100,86,71,57, 100,88,75,62,
%OPT. Lead 100,80,60,40,20 50,33,17 43,29,14 50,38,25,12
Sys. 2 —100,80,60,40,20 100,83,67, 100,86,71,57, 100,88,75,62,
Lead 50,33,17 43,29,14 50,38,25,12
OIL Sys. 1 33 33 3
CHARGE (GALS) Sys. 2 — 3333
CONDENSER – DWP 450 PSIG
NO. OF FANS (30" DlA. DIRECT DRIVE) 47 88 8
60 Hz 11,000 11,000 11,000 11,000 11,000
CFM (EACH) 50 Hz 11,000 11,000 11,000 11,000 11,000
COOLER – DUAL CIRCUITED
DWP – 235 PSIG REF. SIDE,
150 PSIG WATER SIDE
DIA. x LENGTH 14" x 7' 14" x 8' 14" x 8' 16" x 8' 18" x 9'
WATER VOLUME (GAL.) 31 36 33 39 49
Min. 120 120 120 150 200
GPM Max. 550 580 580 640 700
AL Fins 8,335 10,080 10,870 12,115 13,620
WEIGHTS SHIPPING CU Fins 9,935 11,980 12,970 14,815 16,820
(LBS.) AL Fins 8,575 10,400 11,260 12,505 14,280
OPERATING CU Fins 10,175 12,300 13,360 15,205 17,480
REFRIGERANT Sys.1 135 87 116 116 133
CHARGE (LBS. R-22) Sys. 2 — 116 116 133 133
PHYSICAL DATA
NOTE:
1Ratings are in accordance with ARI Standard 590 based upon nominal conditions of 44°F leaving chilled water temperature, 95°F ambient
air temperature on condenser, 10 degree chilled water range and a 0.0005 fouling factor in the cooler.

FORM 150.40-NM20
9
YORK INTERNATIONAL
HANDLING
Theseunits are shippedas completely assembledunits
containing full operating charge, and care should be
taken to avoid damage due to rough handling.
The units are shipped without export crating unless it is
specified by Sales Order.
A unit should be lifted by inserting hooks through the
holes provided in the base rails. Spreader bars should
beused to avoidcrushing the unitwith the liftingchains.
(See Fig. 2.)
INSTALLATION
beneath windows or between structures where normal
operatingsounds maybe objectionable.The condenser
fansare propellertype andare not suitable nor intended
for use with duct work in the condenser air stream.
FOUNDATION
The unit should be mounted on a flat and level founda-
tion, floor or rooftop, capable of supporting the entire
operatingweight ofthe equipment. Ifthe unitis elevated
beyond the normal reach of service personnel, a suit-
able catwalk must be constructed around the unit. The
catwalk must be capable of supporting service person-
nel,theirequipment,andthereciprocatingcompressor(s).
Ground Level Locations
Itis important that theunits be installed on a substantial
base that will not settle. A one piece concrete slab with
footers extended below the frost line is highly recom-
mended. Additionally, the slab should not be tied to the
main building foundations as noise and vibration may
be transmitted.
Mounting holes (11/16" Dia.) are provided in the steel
channel for bolting the unit to its foundation. (See
DIMENSIONS.)
For ground level installations, precautions should be
taken to protect the unit from tampering by or injury to
unauthorized persons. Screws on access panels will
prevent casual tampering. However, further safety pre-
cautions such as a fenced-in enclosure or locking de-
vices on the panels may be advisable. Check local au-
thorities for safety regulations.
Rooftop Locations
Chooseaspotwith adequatestructuralstrengthto safely
support the entire weight of the unit and service per-
sonnel. If the unit is elevated on a steel structure, use
at least a sixpoint mount. Care must be taken not to
damage the roof. Consult the building contractor or ar-
chitect if the roof is bonded. Roof installations should
have wooden beams (treated to reduce deterioration),
cork, or rubber under the base to minimize vibration.
SPRING ISOLATORS (OPTIONAL)
When ordered, eight (8)* vibration isolators will be fur-
nished with each unit. They are of the level adjusting
spring type, manufactured by either Mason Industries
or Vibration Mounting & Controls, Inc.
*Four (4) on YCHA100
INSPECTION
Immediately upon receiving the unit, it should be in-
spectedfor possible damage which may have occurred
during transit. If damage is evident, it should be noted
on the carrier’s freight bill. A written request for inspec-
tionby the carrier’sagent should be made at once. See
“Instruction” Form 50.15-NM for more information and
details.
LOCATION
These units are designed for outdoor installations on
ground level, rooftop, or beside a building. The location
should be selected for minimum sun exposure and to
insurean adequate supplyof freshair forthe condenser.
(See CLEARANCES, pages 4 & 5.) Avoid locations
FIG. 2 – RIGGING THE CHILLER
00005TG

YORK INTERNATIONAL
10
Installation Instructions
1. Identify manufacturers of isolator and locate at
proper mounting point using appropriate table be-
low.
2. Block up equipment so as to install spring mounts
with pin on top of housing into Equipment Mounting
Holes.
3. MountingAdjustment Nut isinside theisolator mount
located just below the top plate of the mount. Turn
nut 2 turns clockwise (down) to load spring mount
at each location.
4. Take two additional turnson Adjustment Nut of each
mount.
5. Repeat step No. 3 as many times as necessary to
bring height of isolator to proper height.
6. Take additional turns on mounts at low side or cor-
ner to level the equipment.
ISOLATOR MOUNTING LOCATIONS
MOUNTING – ALUMINUM COIL UNITS
ISOLATOR LOCATIONS
CHILLER JKLMNPRS
MODEL NO. TYPE & SIZE
YCHA100 406403403404————
YCHA120 401 404 405 404 401 405 405 401
YCHA150 401 402 402 403 401 405 406 404
YCHA175 401 406 405 403 401 403 403 401
YCHA200 404 403 407 405 404 405 407 402
MOUNTING – ALUMINUM COIL UNITS
ISOLATOR LOCATIONS
CHILLER JKLMNPRS
MODEL NO. TYPE & SIZE
YCHA100 2-31 2-31 2-31 2-27 ————
YCHA120 1-31 1-32 2-28 1-32 1-31 2-28 2-28 1-31
YCHA150 1-31 2-27 2-27 2-28 1-31 2-28 2-28 2-31
YCHA175 1-32 2-31 2-28 2-31 1-31 2-31 2-28 2-31
YCHA200 1-32 2-31 4-27 2-27 1-32 2-31 2-32 2-27
MASON INDUSTRIES VIBRATION MOUNTING AND CONTROLS
MOUNTING – COPPER COIL UNITS
ISOLATOR LOCATIONS
CHILLER JKLMNPRS
MODEL NO. TYPE & SIZE
YCHA100 407407406406————
YCHA120 404 405 403 405 404 405 405 404
YCHA150 404 403 403 406 404 406 404 402
YCHA175 402 407 406 406 402 407 406 402
YCHA200 402 407 407 403 405 407 407 402
MOUNTING – COPPER COIL UNITS
ISOLATOR LOCATIONS
CHILLER JKLMNPRS
MODEL NO. TYPE & SIZE
YCHA100 2-32 2-32 2-27 2-31 ————
YCHA120 1-32 2-28 2-28 2-28 1-32 2-28 2-28 1-32
YCHA150 2-27 2-28 2-28 2-31 2-27 2-31 1-32 2-27
YCHA175 2-27 2-32 2-31 2-27 2-32 2-31 2-31 2-27
YCHA200 2-27 2-32 4-28 2-31 2-28 2-32 4-27 2-28
YCHA100 YCHA120, 150, 175, & 200 LD01776

FORM 150.40-NM20
11
YORK INTERNATIONAL
COMPRESSOR MOUNTING
Thecompressor(s)are mountedonfour (4)isolatorpads
(one under each compressor foot). (See Fig. 3.) The
mounting bolts are not to be loosened or adjusted at
installation.
4. All chilled liquid piping should be thoroughly
flushed to free it from foreign material before the
system is placed into operation. Use care not to
flush any foreign material into or through the
cooler.
5. As an aid to servicing, thermometers and pressure
gauges are recommended for installation in the inlet
andoutletwaterlines.Oneconnectionpoint(plugged)
isprovidedin eachcoolernozzle. Thermometersand
gauges are not furnished with the unit and are to be
furnished by other suppliers.
6. The chilled liquid lines that are exposed to outdoor
ambients should be wrapped with a supplemental
heater cable and insulated to protect against
freeze-up during low ambient periods, and to pre-
vent fomlation of condensation on lines in warm
humid climates.
7. A chilled water flow switch, (either by YORK or oth-
ers) must be installed in the leaving water piping of
the cooler. There should be a straight horizontal run
of at least 5 diameters on each side of the switch.
Adjust the flow switch paddle to the size of pipe in
which it is to be installed. (See: manufacturer’s in-
structions furnished with switch.) The switch is to
be wired to terminals in the control panel as shown
in the WIRING DIAGRAM.
WARNING: Flow switch must not be used to stop
and start chiller.
ELECTRICAL WIRING
The YORK Series YCHA Packaged Liquid Chillers are
shipped with all contained controls wired for operation.
Field Wiring – Powerwiring must be provided through
a fused disconnect switch. Minimum circuit ampacity
andmaximum dualelement fuse sizeare givenon page
6. A 115-1-60/ 50, 30 amp source must be supplied for
the control panel through a fused disconnect when a
control panel transformer (optional) is not provided.
Refer to Wiring Diagrams.
Affiliatedapparatus,such asa chilled waterflow switch,
auxiliary contacts from the chilled water pump starter,
alarms,etc. should be interlocked into the control panel
circuit.Thesefield modificationsmay bemade as shown
on the WIRING DIAGRAMS.
MULTIPLE UNITS
For increased compressor protection and to reduce
power inrush at start-up on multiple chiller installa-
tions, provisions must be made to prevent simulta-
neous start-up of two or more units. Also, some
method must be employed to automatically cycle on
or off one or more of the units to permit more effi-
cient operation at part load conditions. A sequencing
kit may be acquired through your local YORK repre-
sentative.
CHILLED LIQUID PIPING
General – When the unit has been located in its final
position, the unit liquid piping may be connected. Nor-
mal installation precautions should be observed in or-
der to receive maximum operating efficiencies. Piping
should be kept as free as possible of all foreign matter.
All liquid cooler piping must comply in all respects with
local plumbing codes and ordinances.
Sinceelbows tees and valvesdecrease pump capacity,
all piping should be kept as simple as possible.
Handstop valves should beinstalled in all lines to facili-
tate servicing.
Pipingtotheinletandoutletconnectionsofthechillermay
include high-pressure rubber hose or piping loops to in-
sureagainsttransmissionofvibration.Thisisoptionaland
the necessary components must be obtained in the field.
Drain connections should be provided at all low points
to permit complete drainage of liquid cooler and piping
system.
A small valve or valves should be installed at the high-
est point or points in the chilled liquid piping to allow
any trapped air to be purged. Vent and drain connec-
tionsshould be extended beyond theinsulation to make
them accessible.
The piping to and from the cooler must be designed to
suit the individual installation. It is important that the
following considerations be observed:
1. The chilled liquid piping system should be laid out
so that the circulating pump discharges directly into
thecooler.Thesuction forthis pumpshould betaken
fromthe pipingsystem return lineand notthe cooler.
2. The inlet and outlet cooler liquid connection sizes
are given on pages 4 and 5.
3. It is recommended that a strainer, preferably 40
mesh, be installed in the cooler inlet line just ahead
of the cooler.
00006TG
FIG. 3 – COMPRESSOR MOUNTING PAD

YORK INTERNATIONAL
12
INTRODUCTION
The YORK YCHA100 MicroComputer Control Panel is
a microprocessor based control system. The micropro-
cessor monitors return water temperature and controls
a single 8 cylinder compressor with 3 unloaders and 4
steps of unloading as needed to maintain the desired
leaving water temperature.
UNIT CONTROLS AND OPERATION
(YCHA100)
Concise, step-by-step instructions are printed on the
control panel to guide you through each control and
monitoring procedcure.
The control panel is also compatible with a building
automation/energy management system.
LD01777
FIG. 4 – CONTROL CENTER (YCHA100)

FORM 150.40-NM20
13
YORK INTERNATIONAL
A 4-digit display (See Fig. 4) allows the operator to se-
lect and display system operating parameters via two
“SelectDataDisplay” rotary switches.Theseparameters
are:
• Return Chilled Water Temperature
• Leaving Chilled Water Temperature
• Low Leaving Water Cutout Temperature
• Return Chilled Water Setpoint
• % Full Load Motor Current
• Suction Pressure
• Oil Pressure, PSID
• Discharge Pressure
• Suction Pressure Cutout Setting, PSIG
• Water Cooling Range Temperature
(Also see Fig. 5 for a complete list)
The system “Return Chilled Water Temp” is entered by
two rotary switches and the “Water Cooling Range” by
a single rotary switch.
The compressor can be activated by the “SYS” toggle
switch.The switch normally remains “ON” after startup.
Remotecyclingand ReturnChilled WaterTemp Setpoint
Resetcan beaccomplished asnoted onPage 18.Load-
ing and unloading decision making is done by software
on the Micro Logic Board. These decisions are made
according to temperature deviations from the selected
setpointandthe selectedcooling range resultingin more
precise control of water temperature.
CONTROL PANEL
1. “CHILLED WATER TEMP SELECT”*
Control is achieved by Return Chilled Water
Setpoint (adjustable from 0°F to 70°F in one de-
gree increments). Setpoint is entered via two ro-
tary switches on the control panel marked “Chilled
Water Temp. Select °F”.
*If needed, the unit can be configured to control
Leaving Chilled Water Temp. This can be accom-
plishedby a jumper/switchon theMicro Board.See
Fig. 11 & 12.
J10 OUT/SW. 3 OFF RWT Control
J10 IN/SW.3 ON LWT Control
NOTE: It is recommended that RWT control be used
unless LWT control is absolutely necessary.
2. “WATER COOLING RANGE” Select Switch
Temperature controlrangeisvariableviaa single ro-
taryswitchlabeled“WaterCoolingRange”.Therewill
be a choice of eight settings (0-7). Available ranges
are 6.0°F, 7.0°F, 8.0°F, 9.0°F, 10.0°F, 11.0°F, 12.0°F,
and14.0°F,correspondingtosetting0-7respectively.
3. SYS “ON/OFF” Switch
The switch allows the operator to manually turn off
thesystem. To operate the system, theswitch must
be in the “ON” position.
4. “DATA DISPLAY CODES”
Refer to this list when selecting the desired sys-
tem parameter to be displayed. A list of the codes
and their respective number is shown in Fig. 5.
5. “UNIT START-UP SEQUENCE”
This is a simplified start-up procedure for switch
setup of the panel and system.
6. “SYSTEM MONITORING OR DIAGNOSIS”
This list informs the operator of the meaning of the
alphabeticcodes whichmay appear onthe display.
Anti-recyclestatus,external devicestatus, and fault
information is displayed using this alphabetical
code. (See Fig. 4 and 5.)
7. “FAULT CODES”
Any time an “F” appears on the display, the com-
pressor will be shut down on a safety control. At
this time, the operator should turn the “SELECT
DATA DISPLAY” rotary switches to the number
“18”. When this is done, a Fault Code will appear
which can be compared to the “FAULT Code” list
to determine the reason for system failure. A list
of the codes and their respective number is shown
in Fig. 5.
An “F” Code overrides any other letter code dis-
play which may appear. See the “SHUTDOWN
SAFETY CONTROLS” and “MANUAL RESET
SAFETYCONTROLS” Section for amore detailed
explanation of the codes.
8. “WATER COOLING RANGE CODE”
Refer to this list when setting up the “WATER
COOLINGRANGE” rotaryswitch. Since theswitch
does not read directly, decoding is necessary.
9. “SELECT DATA DISPLAY” Switches
These switches can be used to display 18 Test
Pointsfor troubleshooting and data recording.This
is done via the 2 Rotary Switches marked “Select
Data Display”. To look at a specific function, select
the number of the function from the “Data Display
Codes” listing on the panel.
Proceed by dialing the number up on the “Select
DataDisplay”Rotary Switches. Intheevent ofafail-
ure,the failurecan bedisplayed byselecting #18of
the “Select Data Display”. The mode of failure will
thenbeindicated bya numberfrom 0-11. Thisnum-
ber can be translated by comparing the number to
the“FaultCode”listing ontherightside ofthepanel.
(YCHA100)

YORK INTERNATIONAL
14
LD01778
Leftmost Digit: No letter (Blank) Informs the operator
that the compressor is ready to run or is running.
A – Indicates that the Flow Switch is open, time clock
is telling the system to turn off, or a remote cy-
clingdevice (EMS, BAS, etc.) is telling the system
to turn off These are devices whose dry contacts
may be connected in series across terminals 3
and 4 of the terminal block in the lower right cor-
ner of the Logic Panel.
c – Shows that the compressor is shut down and cy-
cling on the 2-minute start-up or 10-minute
anti-recycle timer. It will be available for start or will
restartwhenthe2-minuteand10-minuteanti-recycle
timers time out, and demand allows. The “c” code
will disappear as soon as the timers time out.*
F – Indicates that a safety threshold has been ex-
ceeded and the unit is shut down on a Fault. Turn
the Select Data Display to “18” to determine the
reason for shutdown. (See list at right.)
H – Indicates that the compressor isoff becausecool-
ing demand is not present. The compressor will
start as soon as cooling demand is required. The
H code will override a “c” code.
*Anti-Recycle Timers:
Any time a compressor shuts down for any reason, re-
startcannot occur until the 10-minute anti-recycle timer
has timed out and a minimum of 2 minutes (2-minute
start-up timer) has expired since shutdown.
ex. Anti-recycle timer has 8 min. left at shutdown:
Restart can occur in 8 minutes (Anti-recycle time
greater than 2 min.)
ex. Anti-recycle timer has 1 min. left at shutdown:
Restart can occur in 2 min. (Anti-recycle time less
than 2 min.)
ex. Anti-recycle timer has timed out at shutdown:
Restart can occur in 2 min. (Anti-recycle time less
than 2 min.)
ex. Power failure has occured:
Restart can occur 2 min. after the return of power
(Anti-recycle time less than 2 min.)
FIG. 5 – DATA DISPLAY
If “Select Data Display” Switches are set at
0. Return chilled water temperature
1. Leaving chilled water temperature
2. Optional
3. Optional
4. Low leaving water temperature
cutout setting
5. Chilled water setpoint
6. Outside Air Temperature
7. Low Ambient Temperature Cutout Setting
8. % Full load motor current
9. Suction pressure, PSIG
10. Oil pressure, PSID
11. Discharge pressure, PSIG
12. Spare
13. Spare
14. Spare
15. Spare
16. Suction pressure cutout setting, PSIG
17. Optional
18. Fault code (See below)**
**FAULT CODES
DATA DISPLAY CODES
If “Select Data Dis-
play” Switches are set
at:
➤
This data will be
displayed.
➤
0. No Fault
1. Micro detected low/hi motor current or
External hi pressure cutout or
External motor overload
2. Low oil pressure, PSID
3. Low suction pressure, PSIG
4. Micro detected high pressure cutout
5. Spare
6. Spare
7. Spare
8. Spare
9. High ambient temperature
10. Low ambient temperature
11. Low water temperature
If F appears in leftmost position and “Select
Data Display” Switches are set at 18, any of
these Fault Codes may appear:
➤
Description of Fault.
(See Next Page for
Diagnosis)
➤

FORM 150.40-NM20
15
YORK INTERNATIONAL
FAULT CODE DIAGNOSIS
Any time an “F” code is displayed, the compressor will
be shut down. The operator should then place the “SE-
LECT DATA DISPLAY” rotary switches to “18”. This will
cause a number from 0 to 11 to be displayed. This num-
bercan bereferenced to the“Fault Codes”which tell the
operator which system failed and what the cause was.
At the time of a Fault, the microprocessor stores
operating data on the system at the instant of shut-
down. Any display selected by the operator will show
stored data. This data will remain in storage until the
SYSTEM Switch is placed in the OFF position. This
clearsthe microprocessor’s memoryof storeddata, and
any display at this time will be of current system condi-
tions. It also allows the faulted compressor to start.
Before placing the SYSTEM Switch to the OFF posi-
tion, the operator may (via the “SELECT DATA DIS-
PLAY” rotary switches) select the parameter which
caused the fault, and any other related system func-
tion, and view their magnitudes at the time of the fail-
ure. This can provide valuable trouble-shooting infor-
mation.Detailed explanations of all system safeties are
included in the “START-UP SECTION”.
After clearing the Fault, placing the SYSTEM Switch to
the ON position will cause a normal start sequence to
beginunless the problem causing the original trouble is
still causing safety thresholds to be exceeded. If this
occurs, an “F” code will then reappear.
NOTE: Thetroublemaynotimmediatelyshowupand
the system may run for awhile.
CAUTION: Anytime the system shuts down on a Fault,
steps should be taken to find and eliminate
the cause of the problem before attempting
to restart the system.
The operator should also be aware that be-
forethe unit will display an “F” code, the sys-
tem has already shut down twice on a fault
andrestarted within the last90 minutes. This
insures that the system will not shut down
and lock out on a nuisance trip or if the sys-
tem is operating under marginal conditions.
The system will shut down instantly when a Manual
Reset Fault is sensed, but it will allow automatic restart
until it sees a total of any 3 Faults in a 90-minute pe-
riod. A 90-minute counter is started as soon as the first
Faultoccurs. If 2 more faults do not occur in the next90
minutes, the counter is reset to “0”.
Aftera fault, restart cannot beexpected until theanti-re-
cycle timer times out. No display (“F” Code) will be indi-
cated during the first two faults except for a letter code
telling the operator the anti-recycle timer is in effect.
After 3 faults, an “F” code will be displayed and the sys-
tem will not restart. The fault can be cleared and the
compressor restarted by placing the System Off/On
Switch to the OFF position. However another fault will
shutdown thesystem and an“F” codewill be displayed.
The system will continue to shut down on every Fault
until the system runs without faulting for 90 minutes or
until power is cycled. Recycling power will reset the
counter.
SYSTEM COMPONENTS
Micro Logic Board:
The Micro Logic Board is the controller and “decision
maker” in the control panel. It looks at system inputs
via the R.P. Relay, Analog Input, and optional Digital
Input Boards and provides system control through the
Relay Output Board.
Digital Input Board: (optional)
This board allows use of optional remote chilled water
temperature select. These remoteinputs are converted
to logic levels which the Micro Logic Board can under-
stand.
Analog Input Board:
Thisboard receives analog information fromtransducer
(Pressure) and thermistor (temperature) inputs and
routes the data to the Micro Logic Board where it is
used to control the system.
Relay Output Board:
This board converts logic level outputs from the Micro
LogicBoardto 120VAClevels usedbymotor contactors,
solenoids,etc. This board allows the Micro Logic Board
to control the system operation.
R.P. Relay (Run Permissive):
This Relay replaces the optional Digital Input Board.
The R.P. Relay allows connection of remote start/stop
and the flow switch contacts to the system.
Power Supply:
The power supply converts 120VAC input from 2T to
DC voltages of +5V UNREG, +5V REG, +12V
UNREG, +12V REG, and -12V UNREG for supply
voltages to operate the integrated circuitry in the
panel.
Motor Current Board and C.T.’s:
C.T.’s on the 3φpower wiring of the motor send AC
signals proportional to motor current to the Motor Cur-
rent Board which rectifies and filters the signal to vari-
able DC voltage (analog). This analog level is then fed
totheAnalog Input Boardallowingthe MicroLogicBoard
to monitor motor current.
(YCAH 100)

YORK INTERNATIONAL
16
00007TG
MICROPROCESSOR
BOARD
OPTIONAL
DIGITAL
INPUT BOARD
WILL BE
MOUNTED ON
THIS SURFACE
CONTROL POWER
TRANSFORMER
2T
OPTIONAL
DIGITAL INPUT
BOARD WILL BE
MOUNTED ON
THIS SIDE
POWER SUPPLY BOARD
ANALOG INPUT
BOARD (UNDER
POWER SUPPLY
BOARD)
R.P. RELAY
(RUN PERMISSIVE
RELAY)
RELAY
OUTPUT
BOARD
41 EMERGENCY
5 STOP
4 CONNECTIONS
3 FOR FLOW
SWITCH &
REMOTE CYCLING
DEVICES
13FU 14FU L 2 GND
115VAC POWER FUSES 115VAC POWER INPUT
CURRENT C.T.s
UNDER FAN WIRING
MOTOR CURRENT
BOARD (MCB) IS MOUNTED
UNDER FAN CONTACTORS
CONDENSER FAN
MOTOR CONTACTORS
AND FUSES
MOTOR CONTACTORS
FIG. 6 – CONTROL PANEL
- EXTERIOR
FIG. 7 – CONTROL PANEL
- INTERIOR
FIG. 8 – YCHA100
POWER PANEL

FORM 150.40-NM20
17
YORK INTERNATIONAL
SYSTEM SAFETIES
SHUTDOWN SAFETY CONTROLS
A. Thesesoftware controlsin theMicro Board automati-
cally reset and allow restart of the system without
operator intervention (auto-restart) when the condi-
tioncausing the shutdown clears. After the condition
causing the shutdown clears, the unit will restart in a
minimum of 2 minutes or a maximum of 10 minutes,
depending upon the remaining time on the
anti-recycle timer. Restart will occur only if cooling
demand is present. An “F” code will be displayed for
LAT* and HAT* shutdowns. Otherwise, no code will
bedisplayedother than oneindicatingthe anti-recycle
timer(s) is in effect.
1. Power Failure: After power has been restored, the
unit will automatically restart after a 2 minute time
delay. System acts as it does any time power is ap-
plied. Restart is dependent on cooling demand after
the 2 minute start-up timer has completed its cycle.
2. Flow Switch/Remote Cycling Device: The Micro
Board monitors the closure of the Flow Switch Con-
tacts.Upon opening of the contacts, the unit will shut
down and will remain off until the contacts close.
Remote devices are wired in series with the Flow
Switch and can be used to start and stop the unit.
Anytime the contacts open, an “A” Code will appear
on the display indicating a Flow Switch problem or
an EMS/BAS/Time Clock stop.
3. Low Pressure Cutout: Compressor suction pres-
sure cutout is a factory adjustable setpoint (R26) on
the Analog Board. It will be factory set at 44 PSIG. If
Glycolor Brine is utilized, then the cutout can bevar-
ied according to mixture. Suction pressure must be
80% cutout after 30 sec. of running and must remain
above cutout after 4 minutes of operation. The sys-
tem will restart after an LP shutdown provided the
anti-recycle timer has timed out and a minimum 2
minute delay before restart has passed.
NOTE: Thesystemwill belocked outonaFaultif cycled
on LP on 3 successive starts. See LEP (Low
Evaporator Pressure Cutout) in the MANUAL
RESET SAFETY CONTROLS section.
4. Low Ambient Temperature Cutout (LAT*): Unit is
locked out when the ambient temperature is below
0°to50°F (Adjustableon AnalogBoard resistor R24).
This is factory set at 35°F. Upon a rise in tempera-
ture above setpoint, the unit will restart provided the
anti-recycle timer has timed out and a minimum
2-minute delay has passed. An “F 10” code will be
displayed while the temperature is low and the sys-
tem will be shut down. The “F” will disappear when
temp. rises above cut-out.
5.High Ambient TemperatureCutout(HAT*):Unitlocks
out when the ambient temperature is above 130°F.
Uponadecrease in temperaturebelow130°F,the unit
will restart providing the anti-recycle timer has timed
out and a minimum 2-minute delay has passed. An
“F9” code will be displayed while the temperature is
high and the system will be shut down. The “F” will
disappear when temp. drops below cut-out.
MANUAL RESET SAFETY CONTROLS
A. The system will shut down instantly when a Manual
Reset Fault is sensed, but it will allow automatic re-
startuntil it seesa total ofany 3 Faultsin a 90-minute
period.**A 90-minute counter is started as soon as
the first Fault occurs. If 2 more faults do not occur in
the next 90 minutes, the counter is reset to “0”.
Afterafault,restartcannotbeexpecteduntiltheanti-re-
cycletimerstimeout.Nodisplay(“F”Code)willbeindi-
cated during the first two faults except for a letter code
telling the operator the anti-recycle timer is in effect.
After 3 faults, an “F” code will be displayed and the
systemwillnotrestart.Thefaultcanbeclearedandthe
compressor restarted by placing the System Off/On
Switch to the OFF position. However another fault will
shutdownthesystemandan“F”codewillbedisplayed.
The system will continue to shut down after restart on
everyFaultwithan“F” Code untilthesystemrunswith-
out faulting for 90 minutes or until power is cycled. Re-
cycling power will reset the counter to “0”.
1. HP: Unit shuts down when the discharge pressure
exceeds the pressure cutout setpoint of 395 PSI set
in software. An “F4” will appear for this safety. See
also Note 6) FS (Fault Stop) for external HP safety.
2. PowerFault:AnalogsignalsareprovidedtotheMicro-
Board by the Motor Current Board (MCB) which gets
info from 3 current transformers (C.T.’s). A signal of
4VDC = 100% FLA Current. The system shuts down
if the signal is <1.2VDC (<30% FLA) or 4.6 VDC
(>115%FLA) when RunTime>4 sec.This protection
assures that both contactors are energized, all C.T.’s
are connected and operating, and that the motor is
notdrawingexcessivecurrent. AnF1willbe displayed
forthissafety. NOTE:See also Note6)FS(FaultStop).
3. Oil Pressure Cutout: An analog signal is provided
which is the Differential Oil Pressure (PSID). This
PSID provided to the Micro Board = Oil Pressure
PSIG - Suction Pressure PSIG. The system shuts
down if < 10 PSID at run time 4 - 30 seconds; if <25
PSID at run time 30 seconds - 4 minutes; or if <20
PSID at run time > 4 minutes. An “F2” will be dis-
played for this cut-out.
(YCAH100)
* These controls are not furnished as part of the standard unit. A
10K ohm resistor is used in place of them.
** This does not apply to item #4 (LWT Freeze Safety). A fault on
the LWT Freeze Safety will cause the system to shut down and
lock out on a single fault.

YORK INTERNATIONAL
18
4. LWT Freeze Safety: This analog signal is sent by
the Leaving Chilled Water Sensor. If the tempera-
ture drops to < 36°F(factory setpoint), the system
shuts down. For Brine applications, the setpoint can
be varied from 20°F to 40°F on the Analog Board by
R25. An “F11” code will appear for this safety.
5. LEP (Low Evaporator Pressure Cutout): At run
time = 30 sees to 4 min. the micro checks to see that
suction pressure is 80% cut-out. If not, it shuts the
system down. If the analog signal to the Micro Board
tellsthe system that the Suction Pressure is low on3
consecutive starts, the system will shut down and
lock out. See Shutdown Safety Controls, Low Pres-
sureCutout for trippoints. Any time the system shuts
down on a Low Pressure (LP Safety) a 90 min. timer
starts and a “count to 3” counter is software is
incremented to “1”. If the system goes down 2 more
times on a LP Shutdown Safety before the 90 min.
timer times out, the system will shut down and lock
out on a LEP Manual Reset Safety. If the 90 min.
timer times out without 2 more LP shutdowns, the
“count to 3” counter will be cancelled and reset to
“0”. This safety operates like all other Manual Reset
Safeties. An “F3” will be displayed for this cutout.
6. FS (Fault Stop): If external High Discharge Pres-
sureCutoutor externalThermal MotorOverload Sen-
sor contacts open, the system will shut down. The
manual reset on the sensor(if equipped) must be re-
set before the system can be restarted. The external
HP cutout is set at 395 PSI. An F1 will be displayed
for this safety. Note: These same codes will also be
displayedfor a Motor Current (power) Fault. This oc-
curs because these safeties do not allow the motor
contactor to energize, causing motor current to be
“0”. When the system is to start, the Micro sends the
start signal to the contactor pilot relay on the Relay
Output Board. The pilot relay closes a contact which
applies 115VAC to the motor contactor. If the High
Pressure C.O. or motor protector opens, their con-
tacts which are wired in series with the pilot relay
contacts keep 115VAC from being applied to the
motor contactor. The contactor will not pull in as the
Micro commands or will drop out if pulled in so the
system will shut down on low motor current. When-
everan “F1” Fault occurs, check discharge pressure
at the time of the fault, motor current at the time of
fault, and also if the H.P. and motor protector con-
tacts are open.
OTHER SAFETY CONTROLS
1. Suction Pressure: If Suction Pressure exceeds 105
PSIG,the Micro Board will unload the compressor. It
willautomaticallyreload whensuction pressuredrops
below 95 PSIG.
(YCHA100)
2. Flow Switch: To assure that water flow is present in
the evaporator, the Micro Board senses the Flow
Switch input to the R.P. Relay whose contacts con-
nect to J18 & J 19 of the Analog Input Board. If the
Flow Switch opens, the system will shut down and
will not restart until flow is present. An “A” code will
be displayed. The Flow Switch is connected to ter-
minals 3 & 4 of the terminal block at the bottom right
of the Logic Panel. See Fig. 7.
REMOTE START/STOP BY A TIME CLOCK, BUILD-
ING AUTOMATION, OR ENERGY MANAGEMENT
SYSTEM
Remotestarting andstopping is accomplishedby open-
ingand closingcontacts, controlled bya remotesource,
connectedtotheR.P.Relay.Thesecontacts willbewired
in series with the Flow Switch. The Micro Logic Board
looks for the closure of the contacts as a signal to start
thesystem. Opening the contacts is a signal to stop the
system. See Fig. 7 for connection points.
Since the remote contacts are wired in series with the
FlowSwitch,an “A”codewill appearonthe displaywhen
a REMOTE STOP command is given (contacts open).
If the optional Digital Input Board is used for Remote
Temperature Setpoint Reset, be sure that remote start
and stop is connected in series with the Flow Switch
and not to the Digital Input Board EMS Start and Stop
inputs. These Start and Stop inputs are not active.
“OPTIONAL” REMOTE TEMPERATURE SETPOINT
RESET
Remote Temperature Setpoint Reset capabilities can
be added by adding an optional Digital Input Board and
configuring a jumper/switch on the Micro Logic Board.
J9 must be IN or Switch #4 must be ON. See Fig. 11
and 12 for jumper/switch location.
TemperatureSetpointchangesareaccomplished by clos-
ingthecontactsbetween terminals 11and12 ontheDigi-
tal Input Board for a defined period of time. The lowest
temperature desired must be set on the panel via the
“ReturnWaterTemperatureSetpoint”rotaryswitches. To
change the setpoint, the contacts between terminals 11
and 12 must be closed for a period between 1 and 11
seconds. Closure for a period shorter than 1 second will
beignoredbythe Micro LogicBoard.Closurelonger than
11 seconds will be treated as 11 seconds.
The contact closure corresponds to a positive offset
(rise) from the setpoint on the panel. 1 sec = +0° offset
and 11 sec. = +15° or offset = 1.5 (time closed -1 sec.).
For example: A setpoint of 51° on the panel and a con-
tact closure of 4.33 sec. will result in an offset of +5°.
This raises the RWT setpoint to 56°F.

FORM 150.40-NM20
19
YORK INTERNATIONAL
To maintain a remote setpoint, EMS Pulse Width
Modulation input (terminals 11 and 12) on the Digital
InputBoard must berefreshed every 30 minutes or less
(20 minutes is recommended). In other words, to main-
tain the 56°F RWT setpoint, the contacts between ter-
minals 11 and 12 must be closed for a period of 4.33
seconds every 20 minutes. If this is not refreshed at
least every 30 minutes, the Micro Logic Board will take
this as a signal to change the RWT setpoint back to the
original setpoint of 51° on the Control Panel.
ANNUNCIATION ALARM CONTACTS (OPTIONAL)
YORKcan supplyalarm contactswhich willde-energize
to function as a warning if unit malfunction occurs. A 28
voltexternal alarm circuit (by others) must be wired into
the YORK supplied alarm circuit. If the alarm circuit is
applied to chillers used for critical duty (such as pro-
cess duty, or cooling other critical equipment) and the
alarm circuit should fail to function, YORK will not be
(YCHA100)
liablefor damages. Any inductive devices(relays) wired
into the Alarm circuitry must be suppressed. Use P/N
031-00808B suppressor.
EXTERNAL SYSTEM MONITORING AND DlAG-
NOSTICS (OPTIONAL)
RS-232 (or equivalent) Serial Communication Out-
put Board
This port on the bottom right of the Logic Board (J6)
allowsservice personnel toobtain a printoutof unit con-
ditions at any time. To make use of this option, contact
YORK Service or Marketingfor recommended printers.
A printout can be requested by pressing the “Press To
Print”pushbutton on the ControlPanel. This allows ser-
vice personnel or the customer to obtain system pa-
rameters on a periodic basis. *
A print example is shown below.
* Once the printout is obtained, the printer should be disconnected
from the panel at J6. ** The values for System 2 will not relate to anything in the sys- tem.
YORK RECIPROCATING CHILLER
MICROCOMPUTER CONTROL CENTER
SYSTEM STATUS
NO SYSTEM FAULTS
RETURN WATER TEMPERATURE 55.4 DEGF
LEAVING WATER TEMPERATURE 44.0 DEGF
SYSTEM 1 OIL TEMPERATURE 44.0 DEGF
SYSTEM 2 OIL TEMPERATURE 130.8 DEGF
LOW WATER TEMP CUTOUT 36.0 DEGF
TEMPERATURE SETPOINT 54.0 DEGF
OUTSIDE AIR TEMPERATURE 90.2 DEGF
LOW AMBIENT TEMP CUTOUT 35.0 DEGF
SYSTEM 1 MOTOR CURRENT 87 %FLA
SYSTEM 1 SUCTION PRESSURE 66 PSIG
SYSTEM 1 OIL PRESSURE 44 PSID
SYSTEM 1 DISCHARGE PRESSURE 197 PSIG
SYSTEM 2 MOTOR CURRENT 87 %FLA**
SYSTEM 2 SUCTION PRESSURE 59 PSIG**
SYSTEM 2 OIL PRESSURE 51 PSID**
SYSTEM 2 DISCHARGE PRESSURE 191 PSIG**
LOW SUCTION PRESSURE CUTOUT 44 PSIG
TEMPERATURE CONTROL RANGE 54.0 DEGF
TO 48.0 DEGF
SYSTEM 1 LIQUID LINE SOL NO
SYSTEM 2 LIQUID LINE SOL NO**
SYSTEM 1 LOADED NO
SYSTEM 2 LOADED NO**
RUN PERMISSIVE YES

YORK INTERNATIONAL
20
LD01779
(YCHA100)
FIG. 9 – WIRING DIAGRAM YCHA100