____
CONSTRUCTION
DATE ________
Supersedes: 160.47-PW6 (1197)
Form 160.47-PW6 (798)
WIRING DIAGRAM
YORK SOLID STATE STARTER
MILLENNIUM
YS (STYLE C & D) ROTARY SCREW CHILLER
WITH MICROCOMPUTER CONTROL CENTER
JOB DATA:
CHILLER MODEL NO. YS _________________________
NUMBER OF UNITS ____________
SOLID STATE STARTER, MODEL NO. SSS– _____ L _____
MOTOR/STARTER POWER ________ VOLTS, 3-PHASE, ________ HERTZ
OPTIONAL FACTORY INSTALLED DISCONNECT SWITCH __________ AMPS
NOTES:
1. Field Wiring to be in accordance with the current edition of
the National Electric Code as well as all other applicable
codes and specifications.
2. Numbers along the left side of the elementary diagram are
line identification numbers. The numbers along the right
side indicate the line number location of relay contacts. An
underlined contact location signifies a normally closed con-
tact.
3. Terminal board connection points are indicated by num-
bers within a square, i.e.
Main power connection points are indicated by numbers
within a hexagon, i.e.
Component terminal markings are indicated by numbers
within a circle, i.e.
Numbers adjacent to circuit lines are the circuit identifica-
tion numbers.
4. Terminals L1, L2 & L3 are the main power input terminals
and are field connected (see Note 7). Terminals T1, T2 &
T3 are the compressor motor load power terminals and
are factory connected.
5. The three-phase solid state motor overload protection sys-
tem provides compressor-motor overcurrent protection at
105% Full Load Amps.
6. See YORK Control Center Wiring Diagram Product Draw-
ing, Form 160.47-PW2 for Style C and Form 160.47-PW12
for Style D Units.
7. See Field Connection Wiring Diagram, Product Drawing,
Form 160.47-PW4 for details on the following items: main
power transformer sizing; power factor correction capaci-
tors (if applied) wiring location; power wiring ampacity; line
side lug sizes; branch circuit overcurrent protection de-
vice(s) (fuse/breaker) sizing; power and control wiring har-
nesses that require field connection (at extra cost) on units
shipped knocked down (see Note 13).
8. Starter incoming power wiring location, Model YS Full Load
Amps (FLA), Locked Rotor Amps (LRA), inrush amps, and
unit dimensions with YORK Solid State Starter are per Prod-
uct Drawing, Form 160.47-PA1.
1TB
15
L2
2
9. Starter approximate overall dimensions are:
7L/14L – 34" wide x 21-1/2" high x 11" deep; weight is
approx. 194 lbs. with transformer.
26L/33L– 35" wide x 25-1/2" high x 12" deep; weight is
approx. 294 lbs. with transformer. See Notes
7 & 8.
10. The starter will not apply power to the compressor-motor
if the ambient air temperature is higher than 110°F. The
starter cooling pump will begin to run when the compres-
sor-motor is started, and continue to run while the com-
pressor-motor is operating. When the compressor-mo-
tor is de-energized, the cooling pump will continue to run
until the SCR temperature is reduced to 110°F.
11. The short circuit “withstand capacity”, as tested per U.L.
Standard 508 (13th Edition), Para. 31 at 480 volts, in
RMS (Root Mean Square equals .707 x peak current),
symmetrical current are: SSS-7L, 18,000 amps; SSS-
14L, 30,000 amps; SSS-26L and SSS-33L, 42,000
amps. The short circuit “withstand capacity” of the YORK
Solid State Starter with optional disconnect switch, as
tested per U.L. standard 508 (13th Edition), Para. 31
at: 200-480 volts – see above. CSA approved for 600
volts – SSS-7L, 18,000 amps; SSS-14L, 22,000
amps; SSS-26L, 25,000 amps. Disconnect switch not
available for SSS-33L.
12. The allowable voltage* range for application of the starter
is the same as the compressor motor:
FREQ.
RATED
NAMEPLATE
EXTREME OPER. VOLT.
HZ.
VOLTAGE
MOTOR VOLTAGE
LOWEST
HIGHEST
60
200
200 or 208
180
220
60
230
230 or 240
207
254
60
460
460 or 480
414
508
60
575
575 or 600
518
635
50
380
380
342
402
50
400
380
360
423
50
415
415
374
440
*See Form 160.47-PW4, Note 19, for main power transformer voltage drop.
Proud Sponsor
of the 1998
U.S. Olympic Team
36USC380
P.O. Box 1592, York, Pennsylvania USA 17405-1592
Subject to change without notice. Printed in USA
Copyright © by York International Corporation 1998
ALL RIGHTS RESERVED
Form 160.47-PW6 (798)
Supersedes: 160.47-PW6 (1197)
ELEMENTARY DIAGRAM (Cont’d)
LD02613
SOLID STATE STARTER
Type Starting – Reduced voltage; soft start; controlled inrush
maintains the motor current at a constant level throughout
the acceleration period, using six silicon controlled rectifiers.
Enclosure – NEMA I, ventilated; hinged door with lock and
key latch; for indoor location.
Cooling System – Water cooled; unit mounted, factory wired,
inherently protected, 115V, 1/22 HP pump; unit mounted,
cleanable heat exchanger.
Mounting – Unit mounted on the compressor-motor at the
factory. Starter factory wired to YORK Control Center, and
compressor-motor and cooling pump motor.
Meters –
Ammeter – Simultaneous 3-phase, digital readout via Mi-
cro Computer Control Center. Three current transformers
provide isolated sensing. Accuracy is typically ±3% of full
scale. Scales: 7L 0-750A, 14L 0-1500A, 26L 0-2800A,
33L 0-3500A.
Voltmeter – Simultaneous 3-phase, digital readout via Mi-
cro Computer Control Center. 3-phase potential transformer
provides isolated sensing. Accuracy is typically ±3% of full
scale. Scales: 0-300V for 200-240V starters, 0-700V for
380-600V starters.
Elapsed Time Meter – Digital readout of elapsed running
time (0 - 65,535 hours resetable) via MicroComputer Con-
trol Center.
Terminal Lugs – Pressure type (solderless), bolted connec-
tor, tin plated aluminum lugs for incoming 3-phase power line
(copper conductors only) connections and system ground-
ing.
Disconnect Switch – Optional unit mounted factory wired dis-
connects available for SSS-7L, SSS-14L and SSS-26L mod-
els.
PROTECTIVE DEVICES AND
SERVICE INDICATORS (LED TYPE)
Motor Overcurrent Protection – Three-leg sensing solid
state current overloads with indicating light and reset button.
Ambient temperature compensated protection system pro-
vides compressor-motor overcurrent protection at 105% full
load current and at 150% of “Start” current setting. “Over-
load” light indicates overcurrent condition has stopped the
starter and unit.
Phase Rotation & Loss – Protection circuit and indicator light.
Monitors phase rotation and detects a loss of phase. This
protects the motor from running backwards and from starting
if single phasing is detected (or fuse is blown).
High Temperature – SCR heat sink high temperature safety
protection system with three thermistors (one per phase). “High
Temp” indicating light and reset button. Shuts down the starter
and unit, if temperature exceeds safe operating levels. Inhib-
its start-up until temperature falls to an acceptable level.
Transient Overvoltage – dv/dt rate of rise protection for the
SDC’s is furnished by a snubber resistor – capacitor (R-C)
network. It prevents false firing of the SCR’s and reduces the
repetitive peak transient voltage (from incoming power line).
Out-Of-Phase Re-energization Protection (Power Fault) –
Incoming power line momentary interruption (one electrical
cycle duration detected) circuitry to shut down the starter and
unit. Disconnects starter within 3-1/2 electrical cycles. Auto-
reset, restarting unit automatically once fault has cleared.
Prevents abnormally high inrush currents, (resulting in high
transient motor shaft torque) that can be produced in the motor
when it is re-energized soon after a power interruption.
“POWER FAULT” indicator is lit and maintained until reset.
Locked Rotor Protection – If the motor is stalled and will
not come up to speed, a timer (see below) will shut down the
starter and unit after approximately 40 seconds.
105% Motor Current Light – Indicates the compressor-mo-
tor current has exceeded 105% full load amps and the 40
second overload timer has started. If for any reason, the com-
pressor motor does not come up to speed, timer will shut
down the starter and unit after approximately 40 seconds.
This provides an incomplete start sequence function.
Out-of-Lock Light – Indicates excessive input line-to-line volt-
age distortion and initiates system shutdown.
Starter Fault Light – Indicates the compressor-motor current
has exceeded 150% of starting current and the one second
overload timer has started; timer shuts down the starter and
unit.
Undervoltage Safety – Prevents start-up or causes shutdown
if the input line-to-line voltage (any phase) drops below 80%
of the nominal line voltage. Safety is reset when input voltage
rises to 88% of nominal line voltage. Displayed on
MicroComputer Control Center readout.
Phase Current Unbalance – Causes system shutdown if the
percent current unbalance exceeds 30% while operating at
or above 80% FLA. Displayed on MicroComputer Control
Center readout.
Fusing – Starter 3-phase control circuit fuse holders with 500
volt dual element fuses for 200 thru 460 volts or 600 volt single
element fuses for 575 volts. Protection for gate driver/voltme-
ter transformer and control transformer.
Interlocks – A panel shutdown relay provides positive shut-
down of the unit on any starter safety control shutdown; any
unit safety or operating control shutdown, through the YORK
Control Center, will stop the starter via starter control signal.
All interlocks between the YORK Control Center and starter
are furnished completely factory wired.
NOTE: Indicating lights and reset button are on the logic
board inside the MicroComputer Control Center.
CONTROL POWER SUPPLY
1.5 KVA – 115 volt, control power transformer (on side of
starter) with 15 amp secondary fuse (located within Solid State
Starter). Provides control power for starter, YORK Control
Center and starter cooling pump power; completely factory
installed and wired.
FORM 160.47-PW6 YORK INTERNATIONAL
2
13. The YORK Sol