York SSS 7L-B User manual

MODELS SSS 7L-B, 14L-B, 26L-B, 33L-B
7LK-B, 14LK-B, 26LK-B, 33LK-B
(STYLE B)
NOTE
Unless otherwise noted, information in this instruction
is applicable to all style starters of the same size.
Example: 26L-B and 26LK-B
00282VIP
LIQUID COOLED
SOLID STATE STARTER
OPERATION Supersedes: 160.00-O2 (611) Form 160.00-O2 (419)
Issue Date:
April 30, 2019

JOHNSON CONTROLS
2
FORM 160.00-O2
ISSUE DATE: 04/30/2019
This equipment is a relatively complicated apparatus.
During rigging, installation, operation, maintenance,
or service, individuals may be exposed to certain com-
ponents 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, instal-
lation, 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
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
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 in-
dividual 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:
Indicates a possible hazardous situation
which will result in death or serious injury
if proper care is not taken.
Indicates a potentially hazardous situa-
tion which will result in possible injuries
or damage to equipment if proper care is
not taken.
Identies a hazard which could lead to
damage to the machine, damage to other
equipment and/or environmental pollu-
tion if proper care is not taken or instruc-
tions and are not followed.
Highlights additional information useful
to the technician in completing the work
being performed properly.
External wiring, unless specied as an optional connection in the manufacturer’s product line, is
not to be connected inside the OptiView 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 specications and must be performed only by a qualied
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 warn-
ing will void the manufacturer’s warranty and cause serious damage to property or personal injury.

JOHNSON CONTROLS 3
FORM 160.00-O2
ISSUE DATE: 04/30/2019
CHANGEABILITY OF THIS DOCUMENT
In complying with Johnson Controls’ policy for con-
tinuous product improvement, the information con-
tained 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 John-
son Controls QuickLIT website at http://cgproducts.
johnsoncontrols.com.
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, rig-
ging, 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.
CHANGE BARS
Revisions made to this document are indicated with a
line along the left or right hand column in the area the
revision was made. These revisions are to technical in-
formation and any other changes in spelling, grammar
or formatting are not included.
ASSOCIATED LITERATURE
MANUAL DESCRIPTION FORM NUMBER
Operation (Unit) - Model YT, Style G or Later (Centrifugal) 160.55-O1
Operation (Unit) - Model YK, Style E or Later (Centrifugal) 160.54-O1
Operation (Unit) - Model YS, Style E or Later (Screw Chiller) 160.80-NOM1
Operation (Unit) - Model YR, Style A or Later (Screw Chiller) 160.81-O1
Operation (OptiView Control Center) - Model YT, Style G or Later (Centrifugal) 160.55-O1
Operation (OptiView Control Center) - Model YK, Style E or Later (Centrifugal) 160.54-O1
Operation (OptiView Control Center) - Model YS, Style E or Later (Screw Chiller) 160.80-O1
Operation (OptiView Control Center) - Model YR, Style A or Later (Screw Chiller) 160.81-O1
Service (OptiView Control Center) - Model YT, Style G or Later (Centrifugal) 160.55-M1
Service (OptiView Control Center) - Model YK, Style E or Later (Centrifugal) 160.54-M1
Service (OptiView Control Center) - Model YS, Style E or Later (Screw Chiller) 160.80-M1
Service (OptiView Control Center) - Model YR, Style A or Later (Screw Chiller) 160.81-M1
Wiring Diagram (OptiView Control Center) - Model Style G or Later (Centrifugal) 160.55-PW2
Wiring Diagram (OptiView Control Center) - Model YK, Style E or Later (Centrifugal) 160.54-PW8
Wiring Diagram (OptiView Control Center) - Model YS, Style E or Later (Screw Chiller) 160.80-PW2
Wiring Field Connections (Solid State Starter) - Model YT, Style G or Later (Centrifugal) 160.55-PW5
Wiring Field Connections (Solid State Starter) - Model YK, Style E or Later (Centrifugal) 160.54-PW5
Wiring Field Connections (Solid State Starter) - Model YS, Style E or Later (Screw Chiller) 160.80-PW4
Replacement Parts List (Solid State Starter) 160.00-RP3

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JOHNSON CONTROLS 5
FORM 160.00-O2
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TABLE OF CONTENTS
SECTION 1 – THEORY OF OPERATION................................................................................................................. 9
Style B Liquid Cooled Solid State Starter Overview.........................................................................................9
General........................................................................................................................................................... 11
System Microprocessors ................................................................................................................................ 11
Solid State Starter Cooling Loop ....................................................................................................................13
Electrical Conditions.......................................................................................................................................14
Motor Protection .............................................................................................................................................14
SECTION 2 – SYSTEM ARCHITECTURE .............................................................................................................15
SECTION 3 – LOGIC/TRIGGER BOARD...............................................................................................................17
General Information........................................................................................................................................17
Current Scaling...............................................................................................................................................17
Logic/Trigger Board Indicator LEDs ...............................................................................................................18
Relay Functions..............................................................................................................................................18
SECTION 4 – SAFETY SHUTDOWNS...................................................................................................................21
General Information........................................................................................................................................21
105% Motor Current Overload .......................................................................................................................21
High Temperature...........................................................................................................................................21
High Instantaneous Current ...........................................................................................................................21
Open SCR ......................................................................................................................................................22
Output Current Imbalance ..............................................................................................................................22
Phase Rotation...............................................................................................................................................22
Shorted SCR ..................................................................................................................................................23
SECTION 5 – CYCLING SHUTDOWNS.................................................................................................................25
General Information........................................................................................................................................25
High Supply Line Voltage ...............................................................................................................................25
Initialization Failed..........................................................................................................................................25
Invalid Current Scale ......................................................................................................................................26
Logic Board Power Supply .............................................................................................................................26
Logic Board Processor ...................................................................................................................................26
Low Phase Temperature.................................................................................................................................26
Low Supply Line Voltage ................................................................................................................................26
Phase Locked Loop........................................................................................................................................27
Phase Loss.....................................................................................................................................................27
Power Fault ....................................................................................................................................................28
Run Signal......................................................................................................................................................28
Serial Communications ..................................................................................................................................28
Stop Contacts Open .......................................................................................................................................29
SECTION 6 – START INHIBIT................................................................................................................................31
High Temperature...........................................................................................................................................31
SECTION 7 – START-UP INSTRUCTIONS............................................................................................................ 33
Start-Up Checklist ..........................................................................................................................................33
Fill Cooling Loop ............................................................................................................................................33

JOHNSON CONTROLS
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FORM 160.00-O2
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SECTION 8 – MAINTENANCE AND TROUBLESHOOTING.................................................................................35
Manually Running The Closed Loop Coolant Pump ......................................................................................35
Coolant Maintenance .....................................................................................................................................35
Troubleshooting The Closed Loop Coolant Pump..........................................................................................35
Troubleshooting Processes ............................................................................................................................35
Verify Shorted SCR ........................................................................................................................................36
Verify Open or Shorted SCR Gate .................................................................................................................36
Verify Gate Driver Output ...............................................................................................................................36
Verify Real Phase Current Imbalance ............................................................................................................37
Verify False Phase Current Imbalance...........................................................................................................38
Removing SCR Assemblies ..........................................................................................................................38
Installing SCR Assemblies ............................................................................................................................39
TABLE OF CONTENTS (CONT’D)

JOHNSON CONTROLS 7
FORM 160.00-O2
ISSUE DATE: 04/30/2019
LIST OF FIGURES
LIST OF TABLES
FIGURE 1 - LCSSS – Front View, Exterior...............................................................................................................9
FIGURE 2 - LCSSS – Basic Block Diagram ........................................................................................................... 11
FIGURE 3 - LCSSS – Rear View, Exterior .............................................................................................................12
FIGURE 4 - LCSSS – Interior, Connection Section - Fuses And Logic/Trigger Board ...........................................15
FIGURE 5 - LCSSS – Interior, Power Section........................................................................................................16
FIGURE 6 - LCSSS – Logic/Trigger Board Detail .................................................................................................. 18
FIGURE 7 - Logic/Trigger Board Pin Location Diagram ......................................................................................... 20
FIGURE 8 - Current Imbalance Due To Voltage Imbalance ...................................................................................37
FIGURE 9 - LCSSS – Power Components.............................................................................................................39
TABLE 1 - Style B LCSSS Variations .....................................................................................................................10
TABLE 2 - CT Ratio................................................................................................................................................17
TABLE 3 - Current Capability .................................................................................................................................17
TABLE 4 - Logic/Trigger Board Inputs And Outputs...............................................................................................19
TABLE 5 - High Supply Line Voltage......................................................................................................................25
TABLE 6 - Low Supply Line Voltage.......................................................................................................................27
TABLE 7 - Phase Loss ...........................................................................................................................................28
TABLE 8 - LCSSS Thermistor Characteristics .......................................................................................................32
TABLE 9 - Required Material..................................................................................................................................33

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JOHNSON CONTROLS 9
FORM 160.00-O2
ISSUE DATE: 04/30/2019
1
SECTION 1 – THEORY OF OPERATION
STYLE B LIQUID COOLED SOLID STATE
STARTER OVERVIEW
The Style B Liquid Cooled Solid State Starter (LC-
SSS) is a state of the art, soft start for YORK com-
pressor motors. New features include a combined
Logic/Trigger Board, improved data collection,
better generator operation, and easier set-up. The
Style B LCSSS is to be applied only to the YORK
OptiView Control Center.
This instruction is a description of the operation,
start-up and troubleshooting of the Style B YORK
LCSSS. It should be read thoroughly before servicing
this product. Due to the integration of the Solid State
Starter with the YORK OptiView Control Center, an
understanding of the OptiView Control Center is nec-
essary. Therefore, this document should be used with
the ASSOCIATED LITERATURE on Page 3.
FIGURE 1 - LCSSS – FRONT VIEW, EXTERIOR
00283VIP
OPTIONAL
CIRCUIT
BREAKER
CONDUIT CONNECTION TO
OPTIVIEW CONTROL CENTER
LOCK AND KEYS
COOLANT
PUMP
1.5 KVA CONTROL
POWER TRANSFORMER
HIGH HAT FOR OPTIONAL DISCONNECT
SWITCH AND CIRCUIT BREAKER
INLET CONDENSER
WATER CONNECTION
TO HEAT EXCHANGER

JOHNSON CONTROLS
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FORM 160.00-O2
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SECTION 1 – THEORY OF OPERATION
TABLE 1 - STYLE B LCSSS VARIATIONS
MODEL LINE VOLTAGE
APPLICATION (VAC)
PART NUMBER FOR A
STARTER WITH LUG KIT
7L-40 380 371-02506-102
7L-46 440 / 460 / 480 371-02506-103
7L-58 550 / 575 / 600 371-02506-104
7L-50 380 / 400 / 415 50Hz 371-02506-105
14L-17 200 / 208 371-02506-106
14L-28 220 / 230 / 240 371-02506-107
14L-40 380 371-02506-108
14L-46 440 / 460 / 480 371-02506-109
14L-58 550 / 575 / 600 371-02506-110
14L-50 380 / 400 / 415 50Hz 371-02506-111
26L-17 200 / 208 371-02507-102
26L-28 220 / 230 / 240 371-02507-103
26L-46 440 / 460 / 480 371-02507-104
26L-40 380 371-02507-105
26L-58 550 / 575 / 600 371-02507-106
26L-50 380 / 400 / 415 50Hz 371-02507-107
33L-17 200 / 208 371-02507-108
33L-28 220 / 230 / 240 371-02507-109
33L-40 380 371-02507-110
33L-46 440 / 460 / 480 371-02507-111
33L-50 380 / 400 / 415 50Hz 371-02507-112
The New Style B LCSSS is also available with a disconnect switch or a circuit breaker. Consult the sales information for additional part num-
bers for those models.

JOHNSON CONTROLS 11
SECTION 1 – THEORY OF OPERATION
FORM 160.00-O2
ISSUE DATE: 04/30/2019
1
GENERAL
The Style B LCSSS provides a soft continuous-current
start for the compressor motor. During the starting se-
quence, the inrush motor current is limited to the pro-
grammed value of the starting current, by reducing the
voltage applied to the motor. This reduction in voltage
is accomplished when the silicon controlled rectifiers
(SCRs) are turning on in a “phase-back” technique
during motor acceleration. The trigger portion of the
Logic/Trigger Board provides the firing (Turn-ON)
pulses to the SCRs based upon a control voltage
(VCON or Delay angle) provided by the Logic portion
of the Logic/Trigger Board located in the Solid State
Starter cabinet. After the motor has accelerated to syn-
chronous speed, the SCRs are turned full on to conduct
the full AC line voltage to the motor.
The Logic/Trigger Board provides safety functions
to protect the compressor motor and the starter from
many different conditions, such as high and low AC
line voltage problems, high motor current, and pos-
sible SCR failure.
In order to reduce size of the starter, the cooling
to the SCR assemblies is provided by a water-to-
water heat exchanger between the chiller condenser
water loop and the coolant in the closed loop. The
heat exchanger length has been reduced and is now
mounted on the starter itself. To reduce the length
of the heat exchanger, the diameter of the tube has
been increased.
SYSTEM MICROPROCESSORS
The system microprocessors have back-up protection
in case they fail to function. A watch dog circuit is
used, in which, the system microprocessor will strobe
an output at a regular time interval. If the output strobe
is missing, the Logic/Trigger Board will safely shut
down the chiller. Another back-up circuit requires that
the LCSSS receive a hardware and software signal
from the OptiView Control Center, for the chiller to
be started. If the two signals are not received within a
certain period of time, a shutdown will occur.
TT
SCR
ASSY.
TT
SCR
ASSY.
TT
SCR
ASSY.
OA
OB
OC
CURRENT
TRANSFORMERS
CONTROL
POWER
XFMR
LOGIC/TRIGGER BOARD
MOTOR
CURRENT
115VAC
CONTROL POWER TO
OPTIVIEW CONTROL CENTER
COOLANT
PUMP
POWER
SUPPLY
I/O
BOARD
MICRO
BOARD
STARTER INITIATED SHUTDOWN
SERIAL COMMUNICATIONS LINK
OPTIVIEW
CONTROL
CENTER
HEATSINK
TEMP.
COMPRESSOR
MOTOR
FIGURE 2 - LCSSS – BASIC BLOCK DIAGRAM
LD05246

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FORM 160.00-O2
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SECTION 1 – THEORY OF OPERATION
The main system microprocessor performs many func-
tions. It provides the serial communications link be-
tween the Logic/Trigger Board, and the Micro Board
in the OptiView Control Center. It determines the
proper current scaling for the size of starter, and in-
terrogates the RUN/STOP signal from the OptiView
Control Center. This processor also interrogates feed-
back signals to determine Open and Shorted SCR,
Phase Loss, Phase Rotation, Motor Overload, High In-
stantaneous Current, High Line Voltage, and Low Line
Voltage shutdowns.
The VCON signal is generated by the main system
microprocessor. It is a digital signal placed on the
data bus. This processor compares the starting current
value, programmed at the OptiView Control Center,
with the current feedback from the three output cur-
rent transformers. A new value of VCON is generated
every line cycle. This signal is then sent to the pro-
grammable logic device (PLD). The PLD determines
the proper firing order for the SCRs to maintain the
programmed starting current value. As the speed of
the motor approaches synchronous speed output cur-
rent drops off, the VCON value increases, and the PLD
turns the SCRs full on. The output of the PLD is sent
to a digital driver chip and then to six optical couplers,
one for each SCR.
The optical couplers are the first stage of the trigger
portion of the Logic/Trigger Board. They isolate the
high power circuit from the low power circuit. The
power for the high power circuit is supplied from the
J5 connector. The trigger section is made up of six out-
put drivers, one for each SCR. Each output driver has
a dedicated transformer, that steps down the incoming
voltage, and provides isolation between each output
driver.
A digital signal processor (DSP) is used for many
timing and calculation functions. Root Mean Square
(RMS) calculations require that input line voltage and
output current values be calculated on a cycle-by-cycle
basis. These calculations are used to display the RMS
voltage and current for each phase, kW, and kWh on
the OptiView Control Center. The DSP is also used
to interpret the feedback signals from the thermistors
mounted on the SCR’s assemblies. All of these values
are placed on the data bus for the main system micro-
processor to generate faults, if required, and to send
data on to the OptiView Control Center via the serial
communication link.
FIGURE 3 - LCSSS – REAR VIEW, EXTERIOR
PIPE
PLUG WATER
RESERVOIR
WATER
PUMP
DRAIN CAP
HEAT EXCHANGER
00284VIP

JOHNSON CONTROLS 13
SECTION 1 – THEORY OF OPERATION
FORM 160.00-O2
ISSUE DATE: 04/30/2019
1
SOLID STATE STARTER COOLING LOOP
The SCRs in the LCSSS generate heat during normal
running conditions and become very hot during start-
up of the chiller. This heat is generated by the fact that
all of the current flowing to the motor is conducted
through the SCRs. The SCRs are very reliable, but
they do have a slight resistance value when they are
turned on. The resistance, along with the load current
of the motor, generates the heat.
The heat must be dissipated, or the SCRs will fail from
an overheating condition. Two methods are commonly
used to dissipate the heat. The first method, which was
employed on older solid state starters was forced air
cooling. This method works well, but requires a larg-
er cabinet and the addition of many fans. The second
method for dissipating the heat is to employ a water
cooling system similar to that used in automobiles.
The cooling system for the LCSSS is different from
the system in an automobile. In automobiles, heat is
transferred to the air, but the starter transfers heat to
the condenser water.
Condenser water is used to cool the starter for many
reasons. One, the condenser water will always be avail-
able since it is part of the chiller system. The cooling
is free since the condenser water will be cooled in the
cooling towers for the chiller needs, and does not add
any load to the chiller. If the chilled water was used to
cool the starter, this would add to the chiller load and
add cost to the customer. In a few applications where
chilled water is being used because of extremely high
condenser water pressure, a temperature regulating
valve must be used. The temperature regulating valve
should be set to 85°F so that condensation does not
occur inside the starter cabinet. Using condenser wa-
ter eliminates the concern for condensation occurring
inside of the starter cabinet, which could damage the
starter. The reliability of the starter is improved from
the standpoint that the three forced air fans are re-
placed with one circulating pump.
The SCR assemblies are cooled by a pump circulating
coolant in a closed loop through the SCR’s heatsink
and the outer tube of the tube-in-tube heat exchanger.
When the coolant passes through the heatsink, it ab-
sorbs heat from the heatsink. As the coolant passes
through the heat exchanger, it gives up its heat to the
system condenser water that is flowing through the in-
ner tube of the tube-in-tube heat exchanger. The design
of the heat exchanger prevents the closed loop coolant
from mixing with the condenser water. The condenser
water is forced through the heat exchanger by the pres-
sure differential across the condenser shell input and
output.
The cooling loop is lled with coolant
at system start-up commissioning by the
service technician. Refer to start-up in-
structions. As maintenance, the coolant
must be changed every year. If the coolant
is not replaced within this time interval,
a potential for corrosion of the SCR’s
heatsink is greatly increased.
The Logic/Trigger Board constantly monitors the tem-
perature of the three SCR heatsink assemblies with a
thermistor attached to each assembly. The temperature
of each thermistor is sent to the Micro Board in the
OptiView Control Center via the serial communica-
tions link. Refer to ASSOCIATED LITERATURE on
page 3 for details on where this data can be viewed on
the OptiView Control Center.
If the temperature of any assembly exceeds a high
value during a running condition, the Logic/Trigger
Board will initiate a shutdown. Further, anytime the
temperature of any assembly exceeds a high value and
the starter is not running, the chiller will be prevented
from starting and the closed loop coolant pump will be
operated until the temperature has fallen. Also, if the
temperature of any assembly falls below a preset val-
ue, the Logic/Trigger Board will initiate a shutdown.
Changes have been made to the OptiView Control Cen-
ter software to improve the restart time of the starter.
These changes allow for the control of the condenser
water pump when a style ‘B’ LCSSS is used with the
following OptiView Control Center software. On a YK
chiller, the software is C.MLM.01.04 or later. On a YT
chiller, the software is C.MLM.02.01 or later. On a YS
chiller, the software is C.MLM.03.01 or later.
The condenser water pump will be turned on any time
the chiller is started, and will continue to run until
coastdown is complete. After coastdown is completed,
the condenser water pump will continue to run if any
one of the three thermistors indicated that the SCR as-
semblies are too hot. Once the temperature has fallen
to a specified level, the condenser water pump will
turn off.
This new control will cool down the SCR assemblies
more quickly after the chiller has been stopped. Then
the LCSSS can be started sooner, as long as the anti-
recycle timer has been satisfied.

JOHNSON CONTROLS
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FORM 160.00-O2
ISSUE DATE: 04/30/2019
SECTION 1 – THEORY OF OPERATION
ELECTRICAL CONDITIONS
Proper starter operation requires that all phases of the
AC power line voltage are present, and in the correct
rotation. A “Power Fault” circuit provides protection
from rapid power line current interruptions and tran-
sient switching. The AC power line voltage also must
be relatively free of spikes and noise. If these condi-
tions are not met, safety circuitry on the Logic/Trig-
ger Board will cause a shutdown of the LCSSS. These
shutdowns will protect the chiller from rotating in the
wrong direction, or causing transient torque conditions
on the compressor shaft. As well, the LCSSS will shut
down and protect itself and the compressor motor if
the AC power line voltage is too high or too low.
If the LCSSS is intended to be used on a generator
application, then the JP1 jumper on the Logic/Trigger
Board may need to be cut. Even if the starter will be
connected to a generator for emergency power, the JP1
jumper may need to be cut. The JP1 jumper changes
how the Logic/Trigger Board will track the frequency
of the incoming line voltage. (See Figure 6 on page
18 for location of JP1.) If the Logic/Trigger Board
is a Rev. C, then the JP1 jumper must be cut for gen-
erator operation. If the Logic/Trigger Board is a Rev.
D or later, the JP1 jumper has been removed, and the
Logic/Trigger Board will function properly regardless
of whether the starter is connected to the utility or gen-
erator power.
MOTOR PROTECTION
Compressor motor protection circuits are provided on
the Logic/Trigger Board. These circuits protect the
motor from continuous or instantaneous high current
levels. Another circuit is used to determine if the cur-
rent transformers are connected to the Logic/Trigger
Board. This ensures that the LCSSS has current feed-
back before the chiller is started. Without the current
feedback, the inrush current cannot be regulated. Also,
if the output current becomes imbalanced due to AC
power line voltage instability, or faulty SCR, a shut-
down will occur. Other circuits are employed to sense
a signal phase condition to the motor, or if one of the
SCRs is open.
The coolant temperature inside any JCI-supplied
liquid-cooled motor starter must be maintained
above the dewpoint temperature in the equipment
room to prevent condensing water vapor inside the
starter cabinet. Therefore, an additional tempera-
ture-controlled throttle valve is needed in the flow
path for the starter heat exchanger to regulate cool-
ing above the equipment room dewpoint for applica-
tions using cooling sources other than evaporative
air-exchange methods, such as wells, bodies of wa-
ter, and chilled water. The temperature control valve
should be the type to open on increasing drive cool-
ant temperature, fail-closed, and set for a tempera-
ture above dewpoint. It can be requested as factory-
supplied on a chiller order by special quotation.

JOHNSON CONTROLS 15
FORM 160.00-O2
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2
SECTION 2 – SYSTEM ARCHITECTURE
The following LCSSS components are located in an
enclosure mounted to the compressor motor terminal
box. (Refer to Figure 4 on page 15 and Figure 5 on
page 16.)
• SCR Assemblies
• Current Transformers
• Logic/Trigger Board
• Control Circuit Fuses
• Oil Pump Motor Fuses
• Circuit Breaker or Disconnect Switch if used.
A control power transformer is attached to the side of
the starter enclosure. This supplies 115 VAC control
power to the starter and OptiView Control Center. The
YK chiller uses a transformer which is different from
that used on YT and YS chillers.
FIGURE 4 - LCSSS – INTERIOR, CONNECTION SECTION - FUSES AND LOGIC/TRIGGER BOARD
OPTIONAL
CIRCUIT
BREAKER
GROUND TERMINAL
INPUT POWER
CONNECTIONS
POWER CONNECTIONS
TO COMPRESSOR MOTOR
FIBERGLASS
INSULATION
FUSE BLOCK
LOGIC/TRIGGER
BOARD
BUS BAR
00285VIP

JOHNSON CONTROLS
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FORM 160.00-O2
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SECTION 2 – SYSTEM ARCHITECTURE
FIGURE 5 - LCSSS – INTERIOR, POWER SECTION
SCR
GATE
LEADS
SCR
HEATSINK
ASSEMBLIES
INPUT
BUS
BARS
SCR
GATE
LEADS
OUTPUT
CURRENT
TRANSFORMERS
00286VIP

JOHNSON CONTROLS 17
FORM 160.00-O2
ISSUE DATE: 04/30/2019
3
SECTION 3 – LOGIC/TRIGGER BOARD
GENERAL INFORMATION
The new Logic/Trigger Board is basically an integra-
tion of the functions in the Logic and Trigger Board
in the Style A LCSSS. The new board uses a micro-
processor, a digital signal processor, and a program-
mable logic device to duplicate the functions of the
older analog boards. This new board is located in the
LCSSS cabinet.
The Logic/Trigger Board communicates with the Mi-
cro Board in the OptiView Control Center via a serial
communications link made up of a three-wire cable
connected to TB1. The serial communications link is
used to send all displayed data related to the starter,
fault messages, and history data. This data is transmit-
ted every 2 seconds, and then the data on the display of
the OptiView Control Center is updated.
CURRENT SCALING
In order for the motor current to be properly scaled
by the Micro Board, the Logic/Trigger Board sends a
scaling code via the serial communications link to the
Micro Board in the OptiView Control Center. The scal-
ing code is determined by how jumpers are arranged
on the J1 connector on the Logic/Trigger Board. Also,
each model size of starter uses a different CT ratio.
(See Table 2 on page 17.)
Since these jumpers are used to determine the size of
the starter, a common Logic/Trigger Board can be used
for 60 Hz applications. This will simplify the replace-
ment of the Logic/Trigger Board. Each model has a
different current capability, as outlined in Table 3 on
page 17.
The motor FLA and the Starting Current are pro-
grammed on the OptiView Control Center. Refer to the
ASSOCIATED LITERATURE on Page 3 for details
about which form is needed to program these values.
Also, within these model classifications, there are vari-
ous line voltage applications.
TABLE 3 - CURRENT CAPABILITY
LCSSS MODEL MIN
FLA
MAX
FLA
MAX
LRA
MIN START
CURRENT
MAX START
CURRENT
MAX
DISPLAY
AMPS
7L-40, 46, 58 and 50 35 260 1556 310 700 1163
14L-17, 28,40, 46, 58 and 50 65 510 3111 620 1400 2326
26L-17, 28, 40, 46, 58 and 50 125 850 5780 1150 2600 4319
33L-17, 28, 40, 46, and 50 215 1050 7335 1460 3300 5482
TABLE 2 - CT RATIO
MODEL SIZE PINS JUMPERED TOGETHER ON J1 CT RATIO
7L J1-7 TO J1-8, J1-8 TO J1-9, J1-9 TO J1-10 700:1
14L J1-8 TO J1-10, J1-9 TO J1-10 1400:1
26L J1-7 TO J1-10, J1-9 TO J1-10 2600:1
33L J1-9 TO J1-10 3300:1

JOHNSON CONTROLS
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FORM 160.00-O2
ISSUE DATE: 04/30/2019
SECTION 3 – LOGIC/TRIGGER BOARD
LOGIC/TRIGGER BOARD INDICATOR LEDS
The Logic/Trigger Board contains only two LEDs.
Since all of the shutdown messages are displayed on
the OptiView Control Center, there is no need for
LEDs to annunciate a shutdown condition. The two
LEDs are used to verify that the serial communications
link is working.
CR6 is the Receive LED. This LED will flash green
every 2 seconds to indicate that the Logic/Trigger
Board has received data from the OptiView Control
Center. (Refer to Figure 6 on page 18 for location
of LED.)
CR7 is the Transmit LED. This LED will flash red ev-
ery 2 seconds to indicate that the Logic/Trigger Board
has sent data to the OptiView Control Center. (Refer to
Figure 6 on page 18 for location of LED.)
RELAY FUNCTIONS
Relay K1 shall provide a hardware shutdown signal to
the OptiView Control Center via wires 16 and 53. The
relay will provide a normally open set of contacts that
are driven closed when the LCSSS is operating satis-
factorily, and the contacts will open when the LCSSS
initiates a Cycling or Safety shutdown. These contacts
will remain open until the cause of the shutdown has
been rectified.
Relay K2 controls the operation of the closed loop
coolant pump. When the Micro Board commands the
LCSSS to run, the main system microprocessor, via an
output driver, causes the K2 relay contacts to close. As
long as the K2 contacts are closed, the closed loop cool-
ant pump will run. When the Micro Board commands
the LCSSS to stop, the main system microprocessor, via
an output driver, causes the K2 relay contacts to open
(provided all of the thermistor temperatures are below
110°F). This will stop the closed loop coolant pump.
Therefore, the closed loop coolant pump may start and
stop with the compressor motor. Also, the K2 relay will
be energized by the main system microprocessor when
any heatsink temperature exceeds 110°F regardless
of whether the chiller is running or not. When the
temperature falls below 110°F, the main system micro-
processor will de-energize K2 relay causing the pump
to stop.
FIGURE 6 - LCSSS – LOGIC/TRIGGER BOARD DETAIL
J11 J10 J9 J8 J7 J6
J5
J1
TB-2 TB-1 J4 J3 J2 JP1 CR7 CR6 U15 RAM CHIP U16 EPROM
J12
00287VIP

JOHNSON CONTROLS 19
SECTION 3 – LOGIC/TRIGGER BOARD
FORM 160.00-O2
ISSUE DATE: 04/30/2019
3
TABLE 4 - LOGIC/TRIGGER BOARD INPUTS AND OUTPUTS
JUMPER DESCRIPTION
J1 PINS
J1-1 and 2
Phase “A” motor current input from current transformer (2T). AC voltage is read with digital voltmeter across
resistor R76 (top of R76 is GND). Voltage read should be:
RMS Motor Current =
(AC Voltage Measured/3.01) x CT RATIO
CT ratio = 700(7L), 1400(14L), 2600(26L), 3300(33L)
J1-3 and 4 Phase “B” motor current input from current transformer (3T). AC voltage is read across resistor R77
(top of R77 is GND). Refer to Jl-1 and 2 to calculate current.
J1-5 and 6 Phase “C” motor current input from current transformer (4T). AC voltage is read across resistor R78
(top of R78 is GND). Refer to J1-1 and 2 to calculate current.
J1-7 Part of current scaling feedback, and determining the HP of the starter.
J1-8 Part of current scaling feedback, and determining the HP of the starter.
J1-9 Part of current scaling feedback, and determining the HP of the starter.
J1-10 Ground, used as part of the current scaling feedback.
J1-11 Part of current transformer connector interlock circuit.
J1-12 Part of current transformer connector interlock circuit.
J2 PINS
J2-1 Phase “A” SCR assembly thermistor input. Refer to Table 6 for voltages and temperatures.
(Utilize 10K ohm at 25°C thermistors.)
J2-2 See J2-1.
J3-PINS
J3-1 Phase “B” SCR assembly thermistor input. See J2-1 voltage.
J3-2 See J3-1.
J4-PINS
J4-1 Phase “C” SCR assembly thermistor input. See J2-1 for voltage.
J4-2 See J4-1.
J5-PINS
J5-1 115VAC neutral input.
J5-2 115VAC from the secondary of the 1T.
J6-PINS
J6-l Phase “A” Positive SCR gate output. .55-2 VDC as measured to J6-2 when the starter is running.
J6-2 Phase “A” Positive SCR cathode. See J6-1.
J7-PINS
J7-1 Phase “A” Negative SCR gate output. .55-2 VDC as measured to J7-2 when the starter is running.
J7-2 Phase “A” Negative SCR cathode. See J7-1.
J8-PINS
J8-l Phase “B” Positive SCR gate output. .55-2 VDC as measured to J8-2 when the starter is running.
J8-2 Phase “B” Positive SCR cathode. See J8-1.
J9-PINS
J9-1 Phase “B” Negative SCR gate output. .55-2 VDC as measured to J9-2 when the starter is running.
J9-2 Phase “B” Negative SCR cathode. See J9-1.
J10-PINS
J10-L Phase “C” Positive SCR gate output. .55-2 VDC as measured to J10-2 when the starter is running.
J10-2 Phase “C” Positive SCR cathode. See J10-1.

JOHNSON CONTROLS
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FORM 160.00-O2
ISSUE DATE: 04/30/2019
SECTION 3 – LOGIC/TRIGGER BOARD
FIGURE 7 - LOGIC/TRIGGER BOARD PIN LOCATION DIAGRAM
LD05282
RED REDREDREDREDRED
WHT WHTWHTWHTWHTWHT
PHASE CPHASE BPHASE A
J11J10 J9 J8 J7 J6
J12
J2J3
J4TB1
TB2
J1
J5
1
2
12
11
10
9
8
7
6
5
4
3
2
1
12345 12 32 1 2 12 1
2
1
2 12 12 12 12 12 1
JUMPER DESCRIPTION
J11-PINS
J11-1 Phase “C” Negative SCR gate output. .55-2 VDC as measured to J11-2 when the starter is running.
J11-2 Phase “C” Negative SCR cathode. See J11-1.
J12-PINS
J12-1 Switched 115 VAC to cooling loop water pump motor, 115 VAC when pump is commanded to run. 0 VAC when
commanded to stop. Measured to J5-1.
J12-2 115 VAC as measured to J5-1.
TB1 PINS
TB1-1, 16 Stop Contact between the LCSSS and the OptiView Control Center.
Measure 115 VAC to J5-2 when no faults are active. Measure 0 VAC to J5-2 when faults are active.
TB1-2, 53 115 VAC supply voltage from the OptiView Control Center for the Stop Contact.
Measure 115 VAC to J5-2 whenever power is applied.
TB1-3, 24 Run / Stop connections from the OptiView Control Center.
Measure 115 VAC to J5-2 when in a run condition. Measure 0 VAC to J5-2 when in a stop condition.
TB2 PINS
TB2-1 The transmit line for the Serial Communications Link from the Micro Board in the OptiView Control Center J15-1.
TB2-2 The receive line for the Serial Communications Link from the Micro Board in the OptiView Control Center J15-2.
TB2-3 The ground line for the Serial Communications Link from the Micro Board in the OptiView Control Center J15-3.
TB2-4 The 24 VDC power supply. Connected to J30 / P30 Pin 12. Refer to the ASSOCIATED LITERATURE on Page
3 for the proper connection on the J2 connector of the power supply. Measure 24 VDC to TB2-5.
TB2-5 The ground connection for the power supply. Connected to J30 / P30 Pin 6, and J2 Pin 6 on the power supply
inside the OptiView Control Center.
All measurements made to GND (J3-1) unless otherwise noted.
TABLE 4 - LOGIC/TRIGGER BOARD INPUTS AND OUTPUTS