York MILLENNIUM YCUL0045SC Owner's manual

YCUL0045SC - YCUL0275SC
Standard & Metric Models, Combined
380-415/3/50
MODELSONLY
INSTALLATION, OPERATION & MAINTENANCE
MILLENNIUM
®
AIR-COOLED CONDENSING UNITS
HERMETIC SCROLL
Supersedes: Nothing Form150.63-NM2(999)
00096VIP

YORKINTERNATIONAL
2
TABLE OF CONTENTS
Manual Usage & Revisions ....................................5
General Safety Guidelines ......................................5
Product Identification Number ................................ 6
Refrigerant Flow Diagram.......................................8
SECTION 1INSTALLATION
Installation ..............................................................9
Installation Checklist .......................................9
Handling...........................................................9
Inspection......................................................... 9
Location & Clearances ....................................9
Foundation .....................................................10
Ground Level Locations.................................10
Rooftop Locations..........................................10
Noise Sensitive Locations.............................10
Spring Isolators..............................................10
Compressor Mounting...................................10
Electrical Wiring ....................................................10
Refrigerant Piping .................................................12
Power Supply Wiring .............................................18
Control Wiring........................................................21
Electrical Data .......................................................24
Operational Limitations ........................................30
Physical Data (English) ........................................32
Physical Data (Metric) ...........................................34
Dimensions...........................................................36
YCUL0045SC (English).................................36
YCUL0045SC (Metric)....................................38
YCUL0061SC (English).................................40
YCUL0061SC (Metric)....................................42
YCUL0081SC (English).................................44
YCUL0081SC (Metric)....................................46
YCUL0095SC (English).................................48
YCUL0095SC (Metric)....................................50
YCUL0121SC (English).................................52
YCUL0121SC (Metric)....................................54
YCUL0125SC (English).................................56
YCUL0125SC (Metric)....................................58
YCUL0145SC (English).................................60
YCUL0145SC (Metric)....................................62
YCUL0161SC (English).................................64
YCUL0161SC (Metric)....................................66
YCUL0171SC (English).................................68
YCUL0171SC (Metric)....................................70
YCUL0185SC (English).................................72
YCUL0185SC (Metric)....................................74
YCUL0211SC (English) .................................76
YCUL0211SC (Metric) ....................................78
YCUL0235SC (English).................................80
YCUL0235SC (Metric)....................................82
YCUL0255SC (English).................................84
YCUL0255SC (Metric)....................................86
YCUL0275SC (English).................................88
YCUL0275SC (Metric)....................................90
SECTION 2INITIALSTART-UP
Pre-Startup Checklist ............................................92
Unit Operating Sequence .....................................95
SECTION 3UNITCONTROLS
Introduction ............................................................96
Status Key ............................................................98
Display / Print Keys .............................................103
Entry Keys .......................................................... 110
Setpoints Keys..................................................... 111
Unit Keys .......................................................... 117
Unit Operation .....................................................121
SECTION 4CONTROLSERVICEAND
TROUBLESHOOTING
Clearing History Buffers ......................................129
Software Version..................................................129
Service Mode .......................................................129
Control Inputs/Outputs ........................................130
Checking Inputs/Outputs ....................................133
Analog Inputs – Temperature .............................133
Analog Inputs – Pressure ...................................136
Digital Outputs .....................................................137
Keypad ..........................................................137
Optional Printer Installation ................................138
Parts ..........................................................138
Troubleshooting ..................................................139
Maintenance ........................................................142
ISN Control ..........................................................143
SECTION 5ELEMENTARYDIAGRAMS
YCUL0045 – YCUL0095 .....................................146
YCUL0121 ..........................................................150
YCUL0125 – YCUL0185 .....................................154
YCUL0211 – YCUL0275 .....................................158
APPENDIX 1 ISOLATORS

YORKINTERNATIONAL
FORM150.63-NM2
3
LIST OF TABLES
1 Fitting Equivalent Lengths ................................................................................................ 13
2 Miscellaneous Liquid Line Pressure Drops.................................................................... 13
3 Refrigerant Piping Charges ............................................................................................. 13
4 Refrigerant Line Connections .......................................................................................... 13
5 Refrigerant Line Pressure Drops (English)..................................................................... 14
6 Refrigerant Line Pressure Drops (Metric)........................................................................ 16
7 Micropanel Power Supply ................................................................................................. 25
8 Voltage Limitations (English) ........................................................................................... 30
9 Physical Data.................................................................................................................... 32
10 Setpoint Entry List ............................................................................................................. 92
11 Status Key Messages..................................................................................................... 102
12 Operator Data Quick Reference ..................................................................................... 106
13 Cooling Setpoints Programmable Limits & Defaults .................................................... 113
14 Program Key Limits & Defaults ...................................................................................... 115
15 Setpoints Key Quick Reference...................................................................................... 116
16 Unit Keys Programming Quick Reference..................................................................... 120
17 Discharge Air Temperature Control – 6 Compressors ................................................. 122
18 Discharge Air Temperature Control – 4 Compressors ................................................. 122
19 Discharge Air Temperature Control – 3 Compressors ................................................. 122
20 Discharge Air Temperature Control – 2 Compressors ................................................. 122
21 Condenser Fan Control Using Outdoor Ambient
Temperature And Discharge Pressure .......................................................................... 124
22 Condenser Fan Control Using Discharge Only............................................................. 124
23 Low Ambient Condenser Fan Control – Ambient
Temperature And Discharge Pressure Control ............................................................. 125
24 Low Ambient Condenser Fan Control – Discharge
Pressure Control ............................................................................................................ 125
25 Compressor Operation – Load Limiting........................................................................ 126
26 Microboard Binary Inputs................................................................................................ 131
27 Microboard Analog Inputs............................................................................................... 131
28 Microboard Outputs ........................................................................................................ 131
29 Outdoor Air Sensor – Temperature/Voltage/Resistance
Correlation ...................................................................................................................... 134
30 Discharge Air Temperature Sensor – Temperature
Voltage/Resistance Correlation ..................................................................................... 134
31 Suction Temperature Sensor – Temperature/
Voltage/Resistance Correlation ..................................................................................... 135
32 Discharge Pressure Transducer Pressure
To Voltage Conversion Formula ..................................................................................... 136
33 Suction Pressure Transducer Pressure To
Voltage Conversion Formula.......................................................................................... 136
34 Keypad Pin Assignment Matrix....................................................................................... 137
35 Troubleshooting Charts ..........................................................................................139-141
36 ISN Received Data ......................................................................................................... 143
37 ISN Transmitted Data ..................................................................................................... 143
38 ISN Transmitted Data ..................................................................................................... 144
39 ISN Operational and Fault Codes .................................................................................. 145

YORKINTERNATIONAL
4
LIST OF FIGURES
1 Refrigerant Flow Diagram .................................................................................... 8
2 Multipoint Power Supply Wiring – Standard Unit ............................................... 18
3 Single Point Power Supply Wiring...................................................................... 19
4 Optional Single Point Power Supply Wiring –
N-F Disc Switch Or Circuit Breaker .................................................................... 20
5 CTB1 Field Control Wiring.................................................................................. 21
6 CTB2 Field Control Wiring.................................................................................. 21
7 CTB3 Field Control Wiring.................................................................................. 22
8 Discharge Air Sensor Field Wiring..................................................................... 23
9 Optional Suction Temperature Sensor Field Wiring .......................................... 23
10 Discharge Air Temperature Control ................................................................. 121
11 Suction Pressure Control ................................................................................. 123
12 Field & Factory Electrical Connections – Optional
Remote Temperature Reset Board................................................................ 128
13 Microboard Layout ............................................................................................ 132
14 Microboard Relay Contacts .............................................................................. 137
15 Printer Electrical Connections.......................................................................... 138
16 Elementary Diagram ........................................................................................ 146
17 Elementary Diagram ........................................................................................ 150
18 Elementary Diagram ........................................................................................ 154
19 Elementary Diagram ........................................................................................ 158
20 Type CP-1 ......................................................................................................... 164
21 Type CP-2 ......................................................................................................... 164
22 R-Spring Seismic Isolators.............................................................................. 165
23 Type CP Mounting............................................................................................. 166
24 “AEQM”Spring-FlexMounting........................................................................... 167

YORKINTERNATIONAL
FORM150.63-NM2
5
MANUAL USAGE AND REVISIONS
In complying with YORK’s policy for continuous product improvement, the information contained in this document is
subject to change without notice. While YORK makes no commitment to update or provide current information auto-
matically to the manual owner, that information, if applicable, can be obtained by contacting the nearest YORK
Serviceoffice. It istheresponsibility of operating/servicepersonnel to verifytheapplicability ofthesedocuments to the
equipment in question. If there is any question in the mind of operating/service personnel as to the applicability of
thesedocuments, verification with the equipment owner pertainingto equipmentmodifications andcurrent literature
shouldbe madeprior tooperating orservicing theequipment.
Thisdocument is intendedfor useby owner-authorized operating/servicepersonnel. Itis expected thatanyone oper-
atingor servicing thisequipment possessesthe knowledge thatwill enablethem to performtasks properly andsafely.
It is essential that prior to performing any task on this equipment, the individual shall have read and understood this
documentand any referencedmaterials. This individualshall alsocomplywith allapplicable governmental standards
and regulations pertaining to the task in question.
Itis theobligation and responsibility of operating/servicepersonnel towork safely. Failure to complywith anyof these
requirements could result in serious damage to the equipment and/or the property in which it is situated, as well as
severe personal injury or death to people at the site.
GENERAL SAFETY GUIDELINES
During installation, operation, maintenance or service, individuals may be exposed to certain components or condi-
tionsincluding, butnot limited to,refrigerants, oils,materials under pressure,rotating components,and both highand
lowelectrical voltages.Each ofthese itemshas thepotential, ifmisused orhandled improperly, to cause bodily injury
ordeath. Itis essentialthat operating/service personnel identify and recognize theseinherent hazards,protect them-
selves, and proceed safely in completing their tasks.
Workonelectronic equipment should not be undertaken unlessthe individual(s) have been trained
in the proper maintenance of equipment and is (are) familiar with its potential hazards.
Shut off power supply to the equipment before beginning work and follow lockout procedures.
When working inside equipment with power off, take care to discharge every capacitor likely to
holddangerous potential.
Be careful not to contact high voltage connections when installing or operating this equipment.
LOW VOLTAGE
DO NOT be misled by the term “low voltage.” Voltages as low as 50 volts may cause death.
WARNING
HIGH VOLTAGE
Is used in the operation of this equipment.
DEATH OR SERIOUS INJURY
may result if personnel fail to observe safety precautions.

YORKINTERNATIONAL
6
PRODUCT IDENTIFICATION NUMBER (PIN)
YCUL0275SC50xAA
:R-22
BASICMODELNUMBER
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
BASE PRODUCT TYPE NOMINAL CAPACITY UNIT DESIGNATOR REFRIGERANT VOLTAGE/STARTER DESIGN/DEVELOPMENTLEVEL
Y 0### S C 1 7 A
C 1### 2 8 A
A40
U46
50
L58
: YORK
: Chiller
: Air-Cooled
: Condensing
Unit
: Scroll
60HZ: Nominal Tons: Even Number
50HZ: Nominal kW: Odd Number
: Standard Unit :380-415/3/50 :Design Series A
:Engineering
Change
or PIN Level
EXAMPLES:
12345678910 11 12 13 14 15
YCUL0080SC46XAA

YORKINTERNATIONAL
FORM150.63-NM2
7
PRODUCT IDENTIFICATION NUMBER (PIN)
EXAMPLES:
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55
SDTCATSRLXPRS25CX1XXXX3DWSARXBXX4BXXLXSD
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
3Xx
DC1
WB2
VP3
SX4
A 5
6
R7
X8
BXXL11
S
N
OPTIONSMODELNUMBER
MP = Multiple Point
SP = Single Point
NF = Non-Fused
TB = Terminal Block
Ser. = Service
Ind. Sys. Brkr. & L. Ext. Handles = Individual
System Breaker & Lockable External Handle
: Aluminum
: Copper
: Black Fin
: Phenolic
: TEAO Fan
Motors
EVAP. FIELD CONDENSER FIELD CABINET FIELD
: MP Supply TB
: SP Supply TB
: SP NF Disconnect Switch
: SP Circuit Breaker w/ Lockable Handle
: Control Transformer (factory)
: Power Factor Capacitor
May differ in
the future.
: Wire Condenser Headers Only (factory)
: Wire (Full Unit) Enc. Panels (factory)
: Wire (Full Unit) Enc. Panels (field)
: Wire/Louvered Enc. Panels (factory)
: Wire/Louvered Enc. Panels (field)
: Louvered (Cond. Only) Enc. Panels (factory)
: Louvered (Cond. Only) Enc. Panels (field)
: Louvered (Full Unit) Enc. Panels (factory)
: Louvered (Full Unit) Enc. Panels (field)
: Acoustic Sound Blanket
: Low Sound Fans
: 1" Deflection
: Seismic
: Neoprene Pads
55
EXTENDEDFIELD
X
B
C
D
E
F
G
H
: 1st Year Parts Only
: 1st Year Parts & Labor
: 2nd Year Parts Only
: 2nd Year Parts & Labor
: 5 Year Compressor Parts Only
: 5 Year Compressor Parts & Labor Only
: 5 Year Units Parts Only
: 5 Year Unit Parts & Labor
: Low Ambient Kit (factory)
: High Ambient Kit (factory)
: Both Low / High Ambient (factory)
: BAS/EMS Temp. Reset / Offset
: Spanish LCD & Keypad Display
: French LCD & Keypad Display
: German LCD & Keypad Display
: Discharge Pressure Transducers/
Readout Kit
: Suction Pressure Transducers /
Readout Kit
: Both Discharge & Suction Pressure
Transducers / Readout
: N. American Safety Code
(cU.L./cETL)
: No Listing (typically 50HZ non-CE,
non-U.L.
: Remote Control Panel
: Sequence Control & Automatic
Lead Transfer
: Temp. Brine (LBrT)
: Thermal Storage
: Chicago Relief
Code
: Hot Gas By-Pass
(# circuits)
: 300 PSIG DWP Waterside
: Double Thick Insulation
: Weld Flange Kit
: Victaulic Flange Kit
: Flow Switch
: ASME Pressure Vessel &
Associated Codes
: Remote DX Cooler
NOTES:
1. Q : DENOTES SPECIAL / S.Q.
2. # : DENOTES STANDARD
3. X : w/in OPTIONS FIELD, DENOTES NO OPTION SELECTED
4. Agency Files (i.e. U.L. / ETL; CE; ARI; ETC.) will contain info. based on the first 14 characters only.
1617 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 3637
POWER FIELD CONTROLS FIELD COMPRESSOR / PIPING FIELD
XX L ##
SX H TS
SD A C
BX TS
F
GX1
TXXXX
CR
S
B
L
N
XPRS

YORKINTERNATIONAL
8
2 OR 3 COMPRESSORS PER SYSTEM
OIL EQUALIZING
LINE
AIR COOLED CONDENSERS
SERVICE VALVE
OPTIONAL DISCHARGE
PRESSURE TRANSDUCER
HIGH PRESSURE
CUTOUT SWITCH
SERVICE
VALVE
LOW PRESSURE SWITCH OR
SUCTION PRESSURE TRANSDUCER
DISCHARGE LINE
BALL VALVE
LIQUID LINE
SERVICE VALVE
LIQUID LINE
SOLENOID VALVE
** TXV
SUCTION LINE
BALL VALVE
SIGHT GLASS /
MOISTURE INDICATOR
SOLENOID OPERATED
HOT GAS BYPASS VALVE
*
YCUL REFRIGERANT FLOW DIAGRAM
NOTE:YCUL0125-0275 HAVE TWO REFRIGERANT SYSTEMS
* HOT GAS OPTION - SYSTEM 1 ONLY
LIQUID LINE
FILTER DRIER
EVAP.
AIR FLOW
DISCHARGE AIR
TEMPERATURE SENSOR
OPTIONAL SUCTION
TEMP SENSOR
FACTORY PIPING
FIELD PIPING
T
T
**One TXV and Liquid Line Solenoid shown for illustration purposes. Actual refrigerant piping may vary depending on evaporator circuiting.
LD04828
REFRIGERANT FLOW DIAGRAM
FIG. 1 – REFRIGERANT FLOW DIAGRAM
Installation

YORKINTERNATIONAL
FORM150.63-NM2
9
INSPECTION
Immediately upon receiving the unit, it should be in-
spectedfor possibledamage whichmay haveoccurred
duringtransit. Ifdamage is evident,it should be noted in
the carrier’s freight bill. A written request for inspection
by the carrier’s agent should be made at once. See “In-
struction”manual,Form 50.15-NMfor more information
and details.
LOCATIONANDCLEARANCES
Theseunitsare designed forrooftop or groundlevelout-
doorinstallations. Location shouldbe selected formini-
mum sun exposure and to ensure adequate supply of
fresh air for the condenser coils. The units must be in-
stalled with sufficient clearances for air entrance to the
condensercoil,forairdischargeawayfromthecondenser,
andfor servicing access.
In installations where winter operation is intended and
snowaccumulationsareexpected,additionalheight must
beprovided to insurenormal condenserair flow.
Clearancesarelistedunder“Note”inthe “DIMENSIONS”
section.
Toensurewarrantycoverage,this equip-
ment must be commissioned and ser-
viced by an authorized YORK service
mechanic or a qualified service person
experiencedinchillerinstallation.Instal-
lation must comply with all applicable
codes, particularly in regard to electri-
calwiringandothersafetyelementssuch
as relief valves, HP cut-out settings, de-
sign working pressures, and ventilation
requirementsconsistentwith theamount
and type of refrigerant charge.
Lethal voltages exist within the control
panels. Before servicing, open and tag
alldisconnectswitches.
INSTALLATION CHECK LIST
The following items, 1 through 5, must be checked be-
foreplacing the units in operation.
1. Inspect the unit for shipping damage.
2. Rig unit using spreader bars.
3.Open theunit onlyafter pipingis installedand evacu-
ation is complete.
4.Pipeunit using good pipingpractice(refer to ASHRAE
handbook).
5. Check to see that the unit is installed and operated
withinlimitations (Refer toLIMITATIONS).
The following pages outline detailed procedures to be
followed to install and start-up the unit.
HANDLING
These condensing units are shipped as completely as-
sembledunitscontaining a 6lb.(2.7 kg) refrigeranthold-
ing charge, but require field installation of a liquid line
filterdrier,TXV,liquidlinesolenoid,sightglass,discharge
air temperature sensor, and refrigerant piping to the air
handling unit. Care should be taken to avoid damage
dueto rough handling.
The unit should be lifted by inserting hooks through the
holesprovided in unitbase rails.Spreader bars mustbe
usedto avoid crushingthe unitframe rails withthe lifting
chains. See photo at right.
1
00096(RIG)VIP
INSTALLATION

YORKINTERNATIONAL
10
FOUNDATION
The unit should be mounted on a flat and level founda-
tion, floor, or rooftop capable of supporting the entire
operatingweightoftheequipment.SeePHYSICALDATA
for operating weight. If the unit is elevated beyond the
normal reach of service personnel, a suitable catwalk
must be capable of supporting service personnel, their
equipment,and thecompressors.
GROUNDLEVELLOCATIONS
It is important that the units 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
mainbuildingfoundationsasnoise and vibration maybe
transmitted.Mountingholesareprovidedinthesteelchan-
nel for bolting the unit to its foundation. (See DIMEN-
SIONS.)
Forgroundlevelinstallations,precautionsshouldbetaken
to protect the unit from tampering by or injury to unau-
thorizedpersons.Screwsand/orlatcheson access pan-
elswillpreventcasualtampering.However,furthersafety
precautions such as a fenced-in enclosure or locking
deviceson thepanels maybe advisable.
ROOFTOP LOCATIONS
Chooseaspotwithadequatestructuralstrengthtosafely
supportthe entire weightofthe unitandservice person-
nel. Care must be taken not to damage the roof.
ELECTRICALWIRING
Field Wiring –Power wiringmustbe provided through
a fused disconnect switch to the unit terminals (or op-
tional molded disconnect switch) in accordance with
N.E.C. or local code requirements. Minimum circuit
ampacityandmaximumdualelementfusesizearegiven
inthe ELECTRICALDATAtables.
A 120-1-50, 15 amp source must be supplied for the
control panel through a fused disconnect when a con-
trolpaneltransformer(optional) is notprovided.Referto
Table 7 and Figures 2 - 4.
SeeFigures 2- 9 andunit wiringdiagrams forfield and
powerwiringconnections.Refer to section onUNITOP-
ERATION foradetaileddescriptionofoperationconcern-
ing unit contacts and inputs.
Liquid Line Solenoid Connections
Thefieldsuppliedandinstalledliquidlinesolenoidvalves
shouldbeinstalled at theevaporatorand wired using18
Consult the building contractor or architect if the roof is
bonded.Roof installations should have rubber, orvibra-
tion isolators under the base to minimize vibration.
NOISE SENSITIVE LOCATIONS
Efforts should be made to assure that the unit is not
located next to occupied spaces or noise sensitive ar-
easwherenoiselevelwould be a problem.Theunitnoise
is a result of compressor and fan operation. Consider-
ations should be made utilizing noise levels published
in the YORK Engineering Guide for the specific unit
model. Sound blankets for the compressors and low
sound fans are available.
SPRING ISOLATORS (OPTIONAL)
When ordered, four (4) isolators will be furnished.
Identify the isolator, and locate at the proper mounting
point, and adjust per instructions. See Appendix 1.
COMPRESSOR MOUNTING
The compressors are mounted on four (4) rubber isola-
tors. The mounting bolts should not be loosened or ad-
justed at installation of the condensing unit.
AWG minimum wire. Electrical connections should be
made at Terminal Board CTB3. CTB3 is located in the
power panel on the right side of the panel. Note that
power for the solenoid coil is 120 vac. Refer to Fig-
ure7 and unit wiring diagram.
Discharge Air Sensor
Thedischargeairsensorandassociated connector hard-
wareis factory suppliedbut mustbe field installed. Field
wiremustbefieldsupplied(QUABBIN930421-2orequiva-
lent 2 conductor with shield and drain wire - 20 AWG
300V 60°C-polyethyleneinsulationUVresistant). Field
wiring is connected to pins 3, 6, and 9 of J6 on the
microboard. Refer to Figure8 andunit wiring diagram.
Zone Thermostats
Field suppliedthermostats ordry contacts must be field
wired when operating the unit in Suction Pressure
Control Mode . The System 1 zone thermostat is field
wired at CTB1 terminals 13 to 14. On two system units
(YCUL0125 - YCUL0275) System 2 zone thermostat is
Installation
ELECTRICAL WIRING

YORKINTERNATIONAL
FORM150.63-NM2
11
1
fieldwired to CTB1terminals 13to 16. CTB1 terminal is
located in the control panel. Refer to Figure 5 and unit
wiringdiagram.
SeeAirProvingSwitch and RemoteStart-
Stop Contacts sectionsbelow.
Suction Pressure Control cannot be used unless the
optional suction transducers are installed on the unit
(standardonYCUL0211 -YCUL0275).
Suction Temperature Sensors (optional)
This is a field installed option that provides individual
displays of suction line temperature for each system at
thecondensingunit.Thisoptionperformsno control func-
tion,but simply providesthe suction linetemperaturefor
eachrefrigerant system asmeasured at thecondensing
unit.
On the microboard, the connections are field wired to
J5, pins 7, 12, & 1 for System 1; J5, pins 8,13 & 2 for
System 2. Refer to Figure 9 and unit wiring diagram.
The sensors should be attached to the suction line with
copper straps, and heat conducting compound should
beused toensure goodheat transfer.
Air Proving Switch
Theairprovingswitch is fieldwiredtoCTB1 terminals 13
to14 toprevent operationof therefrigerant circuitwhen
the supply air blower is not operating.
Ifseparate evaporator blowers are used with respectto
eachrefrigerant system inthe condensing unit,thentwo
airprovingswitchesmustbewiredinseriesacrossCTB1
terminals13-14(onefor each evaporator blower).Refer
toFigure 5 and unit wiring diagram.
WhenusingZoneThermostatsinSuctionPressure Con-
trol mode, the air proving switch(es) should be wired in
serieswith therespective ZoneThermostats.
Remote Start/Stop Contacts
Toremotely start and stop thecondensing unit,dry con-
tacts can be wired in series with the air proving switch
andCTB1- terminals 13to14. Refer toFigure5and unit
wiringdiagram.
Remote Emergency Cutoff
Immediate shutdown of the condensing unit can be ac-
complished by opening a field installed dry contact to
break the electrical circuit between terminals 5 to L on
terminalblockCTB2.CTB2islocatedinthepowerpanel.
The unit is shipped with a factory jumper installed be-
tweenterminals 5 to L, which must be removed if emer-
gency shutdown contacts are installed. Refer to Figure
6and unit wiring diagram.
Evaporator Blower Start Contacts
Forconstantfan operation: TerminalblockCTB2 - termi-
nals 23 to 24, are normally open contacts that can be
used to switch field supplied power to provide a start
signalto theevaporator blower contactor.
Refer to Figure 6 and unitwiring diagram.
CompressorRunContacts
Contactsareavailabletomonitor“CompressorRun”sta-
tus. Normally-open auxiliary contacts from each com-
pressorcontactorare wired inparallelwith CTB2 -termi-
nals 25 to 26 for system 1, and CTB2 - terminals 27 to
28for system2 (YCUL0125- YCUL0275).Refer toFig-
ure6 and unit wiring diagram.
Alarm Status Contacts
Normally-open contacts are available for each refriger-
ant system. These normally-open contacts close when
the system is functioning normally. The respective con-
tactswill openwhen the unitis shutdown on aunit fault,
orlocked outon a system fault. Fieldconnections areat
CTB2terminals 29to 30 (system1), and terminals 31 to
32 (system 2). Refer to 6 and unit wiring diagram.
PWM Input
The PWM input allows reset of the discharge air tem-
peraturesetpoint(whenunitisprogrammedforDischarge
Air Temperature Control mode) by supplying a “timed”
contact closure. Field wiring should be connected to
CTB1- terminals 13to 20.Adetailed explanationis pro-
vided in the Unit Control section. Refer to Figure 5 and
unitwiring diagram.
Load Limit Input
Loadlimitingisafeaturethatpreventstheunitfromloading
beyond a desired value. The unit can be “load limited”
either 33%, 50%, or 66%, depending on the number of
compressorsontheunit. The field connectionsarewired
to CTB1- terminals 13 to 21, and work in conjunction
withthe PWMinputs. A detailedexplanation isprovided
in the Unit Control section. Refer to Figure 5 and unit
wiringdiagram.
When using the Load Limit feature, the
PWM feature will not function - SIMUL-
TANEOUS OPERATION OF LOAD LIMIT-
ING AND TEMPERATURE RESET (PWM
INPUT)CANNOT BE DONE.

YORKINTERNATIONAL
12
REFRIGERANTPIPING
General – When the unit has been located in its final
position, the unit piping may be connected. Normal in-
stallationprecautions should beobserved inorder to re-
ceive maximum operating efficiencies. System piping
should conform to ASHRAE guidelines. All piping de-
sign and installation is the responsibility of the user.
YORKASSUMES NOWARRANTY RESPONSIBILITY
FOR SYSTEM OPERATION OR FAILURES DUE TO
IMPROPERPIPINGOR PIPING DESIGN.
Filterdriers and sight glasses areshipped loose forfield
installation on each refrigerant circuit. Field refrigerant
piping can be connected to the condensing unit without
loss of the holding charge in the unit.
Allexpansion valves,liquid line solenoidvalves, andre-
frigerantpiping arefield supplied and installed.
Table 4 lists refrigerant line connections sizes per unit
modelnumber.
Refrigerant Line Sizing
Refrigerantpiping systems mustbe designed toprovide
practical line sizes without excessive pressure drops,
preventcompressoroilfrom being “trapped”in the refrig-
erantpiping, andensure proper flow of liquidrefrigerant
tothe thermal expansion valve. Considerations should
begiven to:
1. Suctionline pressure drop due torefrigerant flow.
2. Suctionline refrigerant velocity for oil return.
3. Liquidline pressure drop due torefrigerant flow.
4. Liquidline pressure drop (or gain) due to vertical rise
of the liquid line.
Tables 5 & 6 provide the pressure drops for given pipe
sizes for both liquid and suction lines. The pressure
dropsgiven are per100 ft.(30.5 m) ofrefrigerant piping.
These friction losses do not include any allowances for
strainer, filter drier, solenoid valve, isolation valve, or
fittings.
Nominal pressure drop for solenoids, sight glass, and
driers are shown in Table 2.
Table1includesapproximateequivalent lengths for cop-
per fittings.
To ensure a solid column of liquid refrigerant to the ex-
pansionvalve, the total liquid linepressure drop should
neverexceed 40 psi(276 kPa). Refrigerantvaporin the
liquidlinewillmeasurablyreducevalvecapacityandpoor
systemperformance can be expected.
To allow adequate oil return to the compressor, suction
risersshould be sizedfor aminimumof 1000FPM (5.08
m/s)while thesystem is operating at minimum capacity
toensureoil returnupthe suction riser. Refer toTables5
&6undercolumnlabeled“NominalTons (kW)Unloaded.
Evaporator Below Condensing Unit
On a system where the evaporator is located below the
condensing unit, the suction line must be sized for both
pressure drop and oil return. In some cases, a double
suction riser must be installed to ensure reliable oil re-
turnatreducedloads.Tables5&6indicatewhenadouble
suction riser should be used for listed pipe sizes to pro-
vide adequate oil return at reduced loads. The calcu-
latedinformation wasbased onmaintaining aminimum
of1000 fpm (5.08m/s) refrigerant vaporvelocity.
Condenser Below Evaporator
Whenthecondensing unitislocated below theevapora-
tor, the liquid line must be designed for both friction loss
and static head loss due the vertical rise. The value of
staticheadlossof5psi/ft.(3.4kPa/30cm)mustbeadded
to the friction loss pressure drop in addition to all pres-
suredrops due to driers, valves,etc.
Oil Traps
Allsuction lineswith a vertical rise exceeding3 feet(.91
meters) should have a “P”trap at the bottom and top
(inverted) of the riser. Suction lines with a vertical rise
exceeding25 feet(7.6 meters) should be trappedevery
15feet (4.6 meters).
Refrigerant Charge
The condensing unit is charged with 6 lbs. (2.7 kg) of
R-22foraholdingcharge. Theremainingoperatingcharge
forthe condensing unit, evaporator coil,and refrigerant
pipingmust be“weighed-in”after all refrigerantpiping is
installed, leak checked, and evacuated. Final adjust-
mentofrefrigerantchargeshouldbeverifiedbysubcooling
values (refer to section on Pre-Startup for checking
subcooling).See Table 3for Refrigerant LineCharges.
Filter Driers
Liquidline filterdriers and sightglass isfactory supplied
forfield installation on each refrigerant system.
Refrigerant Piping Reference
Formore details, refer to ASHRAE Refrigeration Hand-
book,Chapter 2.
Installation

YORKINTERNATIONAL
FORM150.63-NM2
13
TABLE 1 –FITTING EQUIVALENTLENGTHS
TABLE 2 –MISCELLANEOUSLIQUIDLINE
PRESSUREDROPS
TABLE 4 –REFRIGERANT LINE CONNECTIONS
* Pressure drops or equivalent length values are approximate. If
more precise value is desired, consult ASHRAE Refrigerant
Handbook.
*COPPER FITTING EQUIVALENT LENGTHS
LINE SIZE O.D. SHORT-RADIUS ELL LONG-RADIUS ELL
3/4" (19mm) 6.5 ft. (2m) 4.5 ft. (1.4m)
7/8" (22mm) 7.8 ft. (2.4m) 5.3 ft. (1.6m)
1-1/8" (29mm) 2.7 ft. (.8m) 1.9 ft. (.6m)
1-3/8" (35mm) 3.2 ft. (1m) 2.2 ft. (.7m)
1-5/8" (41mm) 3.8 ft. (1.2m) 2.6 ft. (8m)
2-1/8" (54mm) 5.2 ft. (1.6m) 3.4 ft. (1m)
2-5/8" (67mm) 6.5 ft. (20m) 4.2 ft. (1.3m)
*MISCELLANEOUSLIQUIDLINE PRESSURE
SOLENOIDVALVE 2 TO 3 PSI (13.8 TO 20.7 kPa)
FILTER DRIER 2 TO 3 PSI (13.8 TO 20.7 kPa)
SIGHTGLASS 0.5 PSI (3.4 kPa)
TABLE 3 –REFRIGERANTPIPINGCHARGES
REFRIGERANTLINECHARGES
SUCTIONLINES LIQUIDLINES
1-3/8" (35mm) 0.2 oz./ft. (6 grams/30cm) 3/4" (19mm) 2.7 oz./ft. (76 grams/30cm)
1-5/8" (41mm) 0.3 oz./ft. (8 grams/30 cm) 7/8" (22mm) 3.7 oz./ft. (105 grams/30cm)
2-1/8" (54mm) 0.6 oz/ft. (17 grams/30cm) 1-1/8" (29mm) 6.2 oz./ft. (176 grams/30cm)
2-5/8" (67mm) 0.8 oz./ft. (23 grams/30cm) 1-3/8" (35mm) 8.6 oz./ft. (244 grams/30cm)
YCULREFRIGERANTLINECONNECTIONS
MODEL SUCTION LIQUID
YCUL
0045 1-3/8" 7/8"
0061 1-5/8" 7/8"
0081 2-1/8" 7/8"
0095 2-1/8" 7/8"
0121 2-1/8" 7/8"
0125 2-1/8" 7/8"
0145 2-1/8" 7/8"
0161 2-1/8" 7/8"
0171 2-1/8" 7/8"
0185 2-1/8" 1-1/8"
0211 2-1/8" 1-1/8"
0235 2-1/8" 1-1/8"
0255 2-1/8" 1-1/8"
0275 2-5/8" 1-1/8"
1

YORKINTERNATIONAL
14
Installation
TABLE 5 –REFRIGERANTLINE PRESSURE DROPS(ENGLISH)
45 113
1-5/8 1.9 2080 7.5 5/8 9.2
52-1/8 0.5 1170 3/4 3.5
61 117
1-5/8 3.2 2720 95/8 15.1
52-1/8 0.8 1530 3/4 5.7
81 122
1-5/8 5.1 3520 12 3/4 9.1
2-1/8 1.3 1980 7/8 4.2
95 128
2-1/8 2.0 2520 14 3/4 14.3
52-5/8 0.7 1680 7/8 6.5
121 132
2-1/8 2.6 2880 11 7/8 8.4
52-5/8 0.9 1920 1-1/8 2.4
118
1-5/8 3.5 2880 93/4 6.3
125 52-1/8 0.9 1620 7/8 2.9
218
1-5/8 3.5 2880 93/4 6.3
52-1/8 0.9 1620 7/8 2.9
122
1-5/8 5.1 3520 11 3/4 9.1
145 52-5/8 1.3 1980 7/8 4.2
218
1-5/8 3.5 2880 93/4 6.3
52-5/8 0.9 1620 7/8 2.9
123
1-5/8 5.5 3680 12 3/4 9.9
161 2-1/8 1.4 2070 7/8 4.5
223
1-5/8 5.5 3680 12 3/4 9.9
2-1/8 1.4 2070 7/8 4.5
126
2-1/8 1.8 2340 13 3/4 12.4
171 52-5/8 0.6 1560 7/8 5.7
222
1-5/8 5.1 3520 11 3/4 9.1
2-1/8 1.3 1980 7/8 4.2
127
52-1/8 1.9 2430 14 3/4 13.3
185 52-5/8 0.7 1620 7/8 6.1
227
2-1/8 1.9 2430 14 3/4 13.3
52-5/8 0.7 1620 7/8 6.1
SUCTION LINE LIQUID LINE
MODEL COPPER 2PRESSURE VELOCITY 4NOMINAL COPPER 3PRESSURE
NUMBER SYSTEM 1NOMINAL TYPE L DROP @ NOMINAL TONS TYPE L DROP
YCUL00 NUMBER TONS INCHES O.D. PSI/100 FT. CAPACITY IN UNLOADED INCHES O.D. PSI/100 FT.
FPM

YORKINTERNATIONAL
FORM150.63-NM2
15
1
TABLE 5 –REFRIGERANT LINEPRESSUREDROPS(ENGLISH)
133
2-1/8 2.7 2970 11 7/8 8.9
211 52-5/8 1.0 1980 1-1/8 2.5
226
52-1/8 1.8 2340 93/4 12.4
52-5/8 .6 1560 7/8 5.7
133
2-1/8 2.7 2970 11 7/8 8.9
235 52-5/8 1.0 1980 1-1/8 2.5
233
2-1/8 2.7 2970 11 7/8 8.9
52-5/8 1.0 1980 1-1/8 2.5
139
2-1/8 3.7 3510 13 7/8 12.1
255 52-5/8 1.3 2340 1-1/8 3.4
233
2-1/8 2.7 2970 11 7/8 8.9
52-5/8 1.0 1980 1-1/8 2.5
139
2-1/8 3.7 3510 13 7/8 12.1
275 52-5/8 1.3 2340 1-1/8 3.4
239
2-1/8 3.7 3510 13 7/8 12.1
52-5/8 1.3 2340 1-1/8 3.4
SUCTION LINE LIQUID LINE
MODEL COPPER 2PRESSURE VELOCITY 4NOMINAL COPPER 3PRESSURE
NUMBER SYSTEM 1NOMINAL TYPE L DROP @ NOMINAL TONS TYPE L DROP
YCUL00 NUMBER TONS INCHES O.D. PSI/100 FT. CAPACITY IN UNLOADED INCHES O.D. PSI/100 FT.
FPM
Notes:
1. Based on R-22 at the nominal capacity of the unit or system, an ambient temperature of 95°F (35°C) and a suction temperature of 45°F
(7.2°C).
2. Suction line sizes were calculated based on a nominal maximum pressure drop to 3 PSI/100 ft. (20.7 kPa/30.5 m). When calculating
suction line pressure drop for a specific application, it should be noted that system capacity decreases as suction line pressure drop
increases.
3. Liquid pressure drop (or gain) due to a vertical liquid line is not included in the tables and must be taken into account when determining
pressure drop (or gain) of the liquid line. The nominal value that must be included in the liquid line loss (or gain) is 0.5 PSI/foot (3.4 kPa/
30 cm) of rise (or gain). To ensure a solid column of liquid refrigerant to the expansion valve, the total maximum pressure drop of the liquid
line should not exceed 40 PSI (276 kPa) based on 15°F (8.3°C) subcooled liquid. Vapor in the liquid line, even in small amounts, will
measurably reduce valve capacity and poor system performance will result. In addition, pressure loss for strainers, filter driers, solenoid
valves, and isolation valve or fittings are not included in this table, and must be taken into account.
4. Nominal Tons (KW) Unloaded is based on one compressor (per system) operating at design conditions.
5. Based on minimum compressor staging for the given pipe size, a double suction riser should be used to ensure proper oil return to the
compressor on all vertical suction risers. Oil returning up the riser moves up the inner surface of the pipe and depends on the mass
velocity of the refrigerant vapor at the wall surface to move the oil up the vertical rise.
6. Hot gas bypass lines are typically 7/8" for lines up to 40 feet and 1-1/8" for lines over 40 feet (12 meters) in length. The field connections
sizes are 7/8" for the optional factory mounted hot gas bypass valve.
Hot gas bypass is only available for refrigerant system number 1.

YORKINTERNATIONAL
16
Installation
TABLE 6 –REFRIGERANTLINE PRESSURE DROPS(METRIC)
45 146
1-5/8 13.1 10.6 26 5/8 63.4
52-1/8 3.4 5.9 3/4 24.1
61 160
1-5/8 22.1 13.8 32 5/8 104.1
52-1/8 5.5 7.8 3/4 39.3
81 177
1-5/8 35.2 17.9 42 3/4 62.7
2-1/8 9.0 10.6 7/8 29.0
95 198
2-1/8 13.8 12.8 49 3/4 99.0
52-5/8 6.2 8.5 7/8 44.8
121 1113
2-1/8 18.0 14.6 39 7/8 58.0
52-5/8 6.2 9.8 1-1/8 16.5
163
1-5/8 24.1 14.6 32 3/4 43.4
125 52-1/8 6.2 8.2 7/8 20.0
263
1-5/8 24.1 14.6 32 3/4 43.4
52-1/8 6.2 8.2 7/8 20.0
177
1-5/8 35.2 17.8 39 3/4 62.7
145 52-5/8 9.0 10.1 7/8 28.6
263
1-5/8 24.1 14.6 32 3/4 43.4
52-5/8 6.2 8.2 7/8 20.0
181
1-5/8 38.0 18.7 42 3/4 68.3
161 2-1/8 9.7 10.5 7/8 31.0
281
1-5/8 38.0 18.7 42 3/4 68.3
2-1/8 9.7 10.5 7/8 31.0
191
2-1/8 12.4 11.9 46 3/4 85.5
171 52-5/8 4.1 7.9 7/8 39.3
277
1-5/8 35.1 17.9 39 3/4 62.7
2-1/8 9.0 10.1 7/8 29.0
195
52-1/8 13.1 12.3 49 3/4 91.7
185 52-5/8 4.8 8.2 7/8 42.1
295
2-1/8 13.1 12.3 49 3/4 91.7
52-5/8 4.8 8.2 7/8 42.1
SUCTION LINE LIQUID LINE
MODEL COPPER 2PRESSURE VELOCITY 4NOMINAL COPPER 3PRESSURE
NUMBER SYSTEM 1NOMINAL TYPE L DROP @ NOMINAL kW TYPE L DROP
YCUL00 NUMBER kW INCHES O.D. kPa/30.5m CAPACITY IN UNLOADED INCHES O.D. kPa/30.5m
m/s

YORKINTERNATIONAL
FORM150.63-NM2
17
1
TABLE 6 –REFRIGERANTLINEPRESSUREDROPS (METRIC)
1116
2-1/8 18.6 15.1 11 7/8 61.4
52-5/8 6.9 10.1 1-1/8 17.2
211 291
52-1/8 12.4 11.9 93/4 85.5
52-5/8 4.1 7.9 7/8 39.3
1116
2-1/8 18.6 15.1 11 7/8 61.2
235 52-5/8 6.9 10.1 1-1/8 17.2
2116
2-1/8 18.6 15.1 11 7/8 61.4
52-5/8 6.9 10.1 1-1/8 17.2
1 137 2-1/8 25.5 17.8 13 7/8 83.4
255 52-5/8 9.0 11.9 1-1/8 23.4
2116
2-1/8 18.6 15.1 11 7/8 61.4
52-5/8 6.9 10.1 1-1/8 17.2
1 137 2-1/8 25.5 17.8 13 7/8 83.4
275 52-5/8 9.0 11.9 1-1/8 23.4
2 137 2-1/8 25.5 17.8 13 7/8 83.4
52-5/8 9.0 11.9 1-1/8 23.4
SUCTION LINE LIQUID LINE
MODEL COPPER 2PRESSURE VELOCITY 4NOMINAL COPPER 3PRESSURE
NUMBER SYSTEM 1NOMINAL TYPE L DROP @ NOMINAL kW TYPE L DROP
YCUL00 NUMBER kW INCHES O.D. kPa/30.5m CAPACITY IN UNLOADED INCHES O.D. kPa/30.5m
FPM
Notes:
1. Based on R-22 at the nominal capacity of the unit or system, an ambient temperature of 35°C (95°F) and a suction temperature of 7.2°C
(45°F).
2. Suction line sizes were calculated based on a nominal maximum pressure drop to 20.7 kPa/30.5 m (3 PSI/100 ft.). When calculating
suction line pressure drop for a specific application, it should be noted that system capacity decreases as suction line pressure drop
increases.
3. Liquid pressure drop (or gain) due to a vertical liquid line is not included in the tables and must be taken into account when determining
pressure drop (or gain) of the liquid line. The nominal value that must be included in the liquid line loss (or gain) is 3.4 kPa/30 cm (.5 PSI/
foot) of rise (or gain). To ensure a solid column of liquid refrigerant to the expansion valve, the total maximum pressure drop of the liquid
line should not exceed 276 kPa (40 PSI) based on 8.3°C (15°F) subcooled liquid. Vapor in the liquid line, even in small amounts, will
measurably reduce valve capacity and poor system performance will result. In addition, pressure loss for strainers, filter driers, solenoid
valves, and isolation valve or fittings are not included in this table, and must be taken into account.
4. Nominal Tons (KW) Unloaded is based on one compressor (per system) operating at design conditions.
5. Based on minimum compressor staging for the given pipe size, a double suction riser should be used to ensure proper oil return to the
compressor on all vertical suction risers. Oil returning up the riser moves up the inner surface of the pipe and depends on the mass
velocity of the refrigerant vapor at the wall surface to move the oil up the vertical rise.
6. Hot gas bypass lines are typically 7/8" for lines up to 40 feet and 1-1/8" for lines over 12 meters (40 feet) in length. The field connections
sizes are 7/8" for the optional factory mounted hot gas bypass valve. Note: Hot gas bypass is only available for refrigerant system
number 1.
Hot gas bypass is only available for refrigerant system number 1.

YORKINTERNATIONAL
18
Control Panel
Circuit # 2
Circuit # 1
See electrical note 9
Power Panel
Field 120-1-50 Micropanel
Power Supply if control
transformer not supplied
Micropanel
Field Unit Power
Supply
GRD
1L1 1L2 1L3
2L1 2L2 2L3
GRD
2
L
CTB2 13 14
CTB1
Air Proving Switch
CTB3
To Field Installed Liquid Line Solenoid Valves
FIG. 2 – MULTI POINT POWER SUPPLY WIRING
MULTI POINT POWER SUPPLY WIRING – (0125 - 0275)
Installation
It is possible that multiple sources of power can be supplying the unit power panel.
To prevent serious injury or death, the technician should verify that no lethal volt-
ages are present inside the panel after disconnecting power, prior to working on
equipment.
LD04835
Electrical Notes and Legend located on Page 24.

YORKINTERNATIONAL
FORM150.63-NM2
19
Control Panel
Power Panel
Micropanel
Field Unit Power Supply
Field 120-1-50 Micropanel
Power Supply if control
transformer not supplied
See electrical note 9
1L1
1L2
1L3
GRD
13 14
CTB1
2
L
CTB2 Air Proving Switch
CTB3
To Field Installed Liquid Line Solenoid Valves
1
FIG. 3 – SINGLE POINT POWER SUPPLY WIRING
SINGLE POINT POWER SUPPLY WIRING – (0045 - 0275)
LD04829
It is possible that multiple sources of power can be supplying the unit power panel.
To prevent serious injury or death, the technician should verify that no lethal volt-
ages are present inside the panel after disconnecting power, prior to working on
equipment.
Electrical Notes and Legend located on Page 24.

YORKINTERNATIONAL
20
Control Panel
See electrical note 9
Power Panel
Micropanel
Field Unit Power
Supply
1L1 1L2 1L3
N-F Disconnect
Sw. OR Molded
Case Circuit
Bkr.
Field 120-1-50 Micropanel
Power Supply if control
transformer not supplied
GRD
CTB2
2
L
13 14
CTB1
Air Proving Switch
CTB3
To Field Installed Liquid Line Solenoid Valves
Electrical Notes and Legend located on Page 24.
FIG. 4 – OPTIONALSINGLE POINTPOWER WIRING
OPTIONAL SINGLE-POINT POWER WIRING
N-F DISC SW OR CIRC BKR (0045 - 0275)
LD04830
Installation
It is possible that multiple sources of power can be supplying the unit power panel.
To prevent serious injury or death, the technician should verify that no lethal volt-
ages are present inside the panel after disconnecting power, prior to working on
equipment.