Johnson Controls YORK YK H Manuel
Wiring diagram
Contractor:
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Purchaser:
Job name:
Location:
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Job data
Chiller model number YK _____________________________________________________________
Number of units ______________________
Compressor motor ______________________ volts, three-phase, _____________________ Hz
Oil pump motor _____________________ volts, three-phase, _____________________ Hz, __________________ FLA
Wiring Diagrams for Model YK (Style H)
with OptiView Control Center and SSS
with Modbus, VSD with Modbus
Form Number: 160.76-PW6 (1021)
Supersedes: 160.76-PW6 (919)
Issue Date: 2021-10-15
General safety guidelines
Important: Read before proceeding.
This equipment is a relatively complicated apparatus. During rigging, installation, operation,
maintenance, or service, individuals may be exposed to certain components or conditions including,
but not limited to: heavy objects, refrigerants, materials under pressure, rotating components, and
both high and low voltage. Each of these items has the potential, if misused or handled improperly,
to cause bodily injury or death. It is the obligation and responsibility of rigging, installation, and
operating/service personnel to identify and recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure to comply with any of these requirements
could result in serious damage to the equipment and the property in which it is situated, as well as
severe personal injury or death to themselves and people at the site.
This document is intended for use by owner-authorized rigging, installation, and operating/service
personnel. It is expected that these individuals possess independent training that will enable them
to perform their assigned tasks properly and safely. It is essential that, prior to performing any
task on this equipment, this individual shall have read and understood the on-product labels, this
document and any referenced materials. This individual shall also be familiar with and comply
with all applicable industry and governmental standards and regulations pertaining to the task in
question.
Safety symbols
The following symbols are used in this document to alert the reader to specific situations:
DANGER
Indicates a possible hazardous situation which will result in death or serious injury if proper care is not
taken.
WARNING
Indicates a potentially hazardous situation which will result in possible injuries or damage to equipment
if proper care is not taken.
CAUTION
Identifies a hazard which could lead to damage to the machine, damage to other equipment and/or
environmental pollution if proper care is not taken or instructions and are not followed.
Note: Highlights additional information useful to the technician in completing the work being
performed properly.
Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with
Modbus
2
WARNING
External wiring, unless specified as an optional connection in the manufacturer’s product line, is not
to be connected inside the control cabinet. Devices such as relays, switches, transducers and controls
and any external wiring must not be installed inside the micro panel. All wiring must be in accordance
with Johnson Controls’ published specifications and must be performed only by a qualified electrician.
Johnson Controls will NOT be responsible for damage/problems resulting from improper connections
to the controls or application of improper control signals. Failure to follow this warning will void the
manufacturer’s warranty and cause serious damage to property or personal injury.
Changeability of this document
In complying with Johnson Controls’ policy for continuous product improvement, the information
contained in this document is subject to change without notice. Johnson Controls makes no
commitment to update or provide current information automatically to the manual or product
owner. Updated manuals, if applicable, can be obtained by contacting the nearest Johnson
Controls Service office or accessing the Johnson Controls Knowledge Exchange website at https://
docs.johnsoncontrols.com/chillers/.
It is the responsibility of rigging, lifting, and operating/service personnel to verify the applicability
of these documents to the equipment. If there is any question regarding the applicability of these
documents, rigging, lifting, and operating/service personnel should verify whether the equipment
has been modified and if current literature is available from the owner of the equipment prior to
performing any work on the chiller.
Revision notes
Revisions made to this document are indicated in the following table. These revisions are to
technical information, and any other changes in spelling, grammar, or formatting are not included.
Table 1: Revision notes
Affected pages Description
3 Associated literature table updated
17 Pressure temperature chart updated
Associated literature
Manual description Form number
Wiring Diagrams – Field Connections for YK Chiller (Style H) with OptiView Control
Center and LV EMS or LVSSS
160.76-PW1
Wiring Diagrams – Field Control Modifications for YK Chiller Compressor Style
Information
160.76-PW4
Wiring Diagrams – Model YK (Style H) with OptiView Control Center and SSS with
Modbus, VSD with Modbus
160.76-PW6
Wiring Diagrams – Model YK with LVVSD 160.76-PW7
3Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with Modbus
Notes
1. This wiring diagram describes the standard electronic control scheme for use with YORK Solid
State Starter or Variable Speed Drive. For details of standard modifications, refer to Form
160.76-PW4.
2. Field wiring must be in accordance with the National Electrical Code (NEC), as well as all other
applicable codes and specifications. Refer to product Form 160.76-PW1 or 160.76-PW7 for field
wiring connections.
CAUTION
Field wiring contacts may have voltage present when power is removed. Field wiring contacts
could be connected to external power sources.
3. Numbers along the left side of the diagram are line identification numbers. The numbers
along the right side indicate the line number location of the relay contacts. An underlined
contact location signifies a normally closed contact.
4. The main control panel class 1 field wiring terminal connection points are indicated by
numbers within a rectangle. The main control panel factory wiring terminal connection points
are indicated by numbers within a triangle. Components markings are indicated by numbers
within a circle. Numbers adjacent to circuit lines are the circuit identification numbers.
5. To cycle the unit on and off automatically with contacts other than those shown, install a
cycling device between Terminals 1 and 13 (line 38). See Note 7. If a cycling device is installed,
the jumper must be removed between Terminals 1 and 13.
6. A remote run-stop switch may be connected to Terminals 1 and 7 (line 32). See Note 7. The
remote run-stop (line 32) is operative only in the remote operating mode.
7. The device contact rating must be 5 mA at 115 VAC.
8. The contact rating is 5 A resistive at 120 VAC or 240 VAC.
9. For the wiring diagram of LCSSS or LVVSD, refer to product Form 160.76-PW6.
10. A jumper is installed between Terminals 21 and 24 for normal operation. To check motor
rotation on initial start-up, complete the following steps:
a. Remove the jumper and install a momentary switch between Terminals 21 and 24.
b. Press the Start key on the display screen on the control panel.
c. After completion of the prelube sequence, jog the motor with the momentary switch.
d. When proper rotation is obtained, replace the momentary switch with a jumper. The
momentary switch must have a minimum contact rating of 1 FLA, 10 LRA at 115 VAC.
CAUTION
A temporary momentary switch or jumper is the only connection permitted between
Terminals 21 and 24. Connections of any other devices to either Terminals 21 and 24 may
cause inadvertent compressor start-up.
11. Solid state motor overload contact (CM) LCSSS is set up to trip at 105% FLA.
Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with
Modbus
4
12. Contact rating is 5 A resistive at 250 VAC and 30 VDC, and 2 A inductive (0.4 PF) at 250 VAC and
30 VDC.
13. Field connected control power supply is not required, as control transformer is supplied on
the solid state starter and the medium voltage variable speed drive.
14. The maximum allowable current draw for the sum of all loads is 2 A holding, 10 A inrush.
15. Each 115 VAC field-connected inductive load, that is relay coil, motor starter coil, and others,
must have a transient suppressor wired in parallel with its coil, physically located at the coil.
Spare transient suppressors and control circuit fuses are supplied in a bag attached to the
green ground screw located in the lower left corner of the control panel.
5Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with Modbus
Legend
Item Description
1HTR 1 phase 1000 Watt oil heater
1LEP Low evaporator pressure (provided by evaporator pressure transducer)
1OL 2T protector (346 V AD 600 V units only)
1T Class 2 power supply transformer
3M Condenser pump motor starter
1R Compressor motor / 1HTR heater control relay (K18 - located on I/O board)
3R VS oil pump drive run relay
1SOL Oil return solenoid valve
1SW Safety stop switch
CM Solid state overload/power fault contacts
FDTS Faulty discharge temperature sensor
FLA Full load amps (compressor motor)
FU Fuse
PGD Proximity gap distance (probe located in compressor)
HDT Refrid. high discharge temperature (provided by RT2)
HOP High oil pressure (provided by two transducers)
HOT High oil temperature (provided by RT3)
HPCO High pressure cutout
K13, K14, K17 Relays mounted on I/O board see operation manual
LCWT Leaving chilled water temp (PWM). See 160.73-PW4.
LEP Low evaporator pressure (provided by evaporator press transducer)
LLS Liquid level sensor (probe)
LOT Low oil temperature (provided by RT3 and condenser press transducer)
LOTD Low oil temperature differential (provided by RT3 and condenser press transducer)
HGBP Hot gas bypass
L1 Inductor 4A, 9mH (460 VAC) or 8A, 3mH (230 VAC)
LWT Low water temperature (provided by RT3)
MOV Metal oxide varistor
OL Motor starter overloads
OP Low oil pressure (provided by two transducers)
OVA Condenser level control actuator
PRV Pre-rotation vane motor
Remote current limit setpoint (PWM). See 160.73-PW4.
RES Resistor
RT1-RT9 Resistance temperature sensing element
SUPR Transient suppressor
TB1, TB3, TB5 Terminal block, factory wiring -
TB2, TB4 Terminal block, field connection -
TB6 Terminal block, field (bottom), factory (top)
VGD Variable geometry diffuser
VMP Vane motor potentiometer
VMS Vane motor switch
VS Variable speed oil pump drive
Field wiring
Factory wiring
Circuit board or enclosure boundary
Jack (J1, J2, ...)
Plug (P1, P2, ...)
Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with
Modbus
6
Item Description
Wire entrance hole in control panel
Option (when supplied) by YORK
Mechanical linkage
Shield cable
Metal oxide varistor
Terminal located in starter (TB1 or 1TB)
7Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with Modbus
Wiring diagrams
Elementary diagram
Figure 1: Elementary diagram
Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with
Modbus
8
Figure 1: Elementary diagram
9Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with Modbus
Figure 2: Elementary diagram
Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with
Modbus
10
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