York millennium recip chiller инструкция на русском языке

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MILLENNIUM

TM

CENTRIFUGAL LIQUID CHILLERS

OPERATING & MAINTENANCE

MODEL YK M3 M3 G4 THRU YK S6 S4 J2 (STYLE C)

R-22 (COOLING ONLY)

MODEL YK LB LB G4 THRU YK SE SC J4 (STYLE C)

R-134a (COOLING ONLY)

WITH MICROCOMPUTER CONTROL CENTER

PART #371-01200-010, 371-01200-011 & 371-01200-015

FOR ELECTRO-MECHANICAL STARTER,

SOLID STATE STARTER & VARIABLE SPEED DRIVE

Supersedes: Nothing

Form 160.49-O2 (1296)

WW

ARNINGARNING

W

ARNING

WW

ARNINGARNING

SYSTEM CONTAINS REFRIGERANT UNDER PRESSURE.

SERIOUS INJURY COULD RESULT IF PROPER PROCEDURES ARE NOT
FOLLOWED WHEN SERVICING SYSTEM. ALL SERVICE WORK SHALL
BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN IN ACCOR­DANCE WITH Y ORK INSTALLATION/OPERA TION MANUAL.

27385A

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ABLE OF CONTENTSABLE OF CONTENTS

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ABLE OF CONTENTS

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ABLE OF CONTENTSABLE OF CONTENTS

Page

SECTION 1 – Description of System and

Fundamentals of Operation ………………………………….. 4

SECTION 2 – MicroComputer Control Center ……………………………….. 6

SECTION 3 – System Operating Procedures ………………………………. 30

SECTION 4 – System Component Description ……………………………. 37

SECTION 5 – Operational Maintenance ……………………………………… 42

SECTION 6 – Trouble Shooting………………………………………………….. 44

SECTION 7 – Maintenance ……………………………………………………….. 49

SECTION 8 – Preventive Maintenance……………………………………….. 58

REFERENCE INSTRREFERENCE INSTR

REFERENCE INSTR

REFERENCE INSTRREFERENCE INSTR

DESCRIPTION FORM NO.

Solid State Starter – Operation & Maintenance 160.46-OM3.1
V ariable Speed Drive – Operation 160.00-O1
Installation 160.49-N5
Installation and Operation of Printers 160.49-N7
Wiring Diagram – Unit with Electro-Mechanical Starter 160.49-PW7
Wiring Diagram – Field Connections (E-M Starter) 160.49-PW10
Wiring Diagram – Field Control Modifications 160.49-PW13
Wiring Diagram – Control Center with SS Starter 160.49-PW8
Wiring Diagram – Field Connections (SS Starter) 160.49-PW11
Wiring Diagram – Solid State Starter 160.49-PW14
Wiring Diagram – Unit with Solid State Starter 160.49-PW8
Wiring Diagram – Unit with Variable Speed Drive 160.49-PW9
Wiring Diagram – Field Connections (V.S.D.) 160.49-PW12
Wiring Diagram – Variable Speed Drive 160.49-PW15

UCTIONSUCTIONS

UCTIONS

UCTIONSUCTIONS

2 YORK INTERNA TIONAL

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R-22 UNITS

YK N2 N1 H1 – CX C

CONDENSER CODE
M3, M4, N3, N4, P3, P4, Q3, Q4, R3, R4, S3, S4

COOLER CODE
M3, M4, N3, N4, P3, P4, P5, P6, Q3, Q4, Q5, Q6,
R3, R4, R5, R6, S5, S6

NOMENCLATURE

DESIGN LEVEL (C)

POWER SUPPLY
– for 60 HZ
5 for 50 HZ

COMPRESSOR CODE
G4, H0, H1, H2, J1, J2

FORM 160.49-O2

MOT OR CODE:

{

60 HZ 50 HZ
CH CX 5CE 5CT
CJ CY 5CF 5CU
CK CZ 5CG 5CV
CL CA 5CH 5CW
CM CB 5CI 5CX
CN DA 5CJ 5DA
CP DB 5CK 5DB
CR DC 5CL 5DC
CS DD 5CM 5DD
CT DE 5CN 5DE
CU DF 5CO 5OF
CV DH 5CP 5OG
CW DJ 5CQ 5OH

5CR 5OJ
5CS

MODEL

R-134a

YK NB PB H1 – CX C

CONDENSER CODE
LB, LC, MB , MC, NB, NC,
PB, PC, QB, QC, RB, RC, SB, SC

COOLER CODE
LB, LC, MB , MC , NB, NC, PB , PC, PD , PE,
QB, QC, QD, QE, RB, RC, RD , RE, SD, SE

DESIGN LEVEL (C)

POWER SUPPLY
– for 60 HZ
5 for 50 HZ

COMPRESSOR CODE
G4, H0, H1, H2, J1, J2, J3, J4

MOT OR CODE:

{

60 HZ 50 HZ
CH CX 5CE 5CT
CJ CY 5CF 5CU
CK CZ 5CG 5CV
CL CA 5CH 5CW
CM CB 5CI 5CX
CN DA 5CJ 5DA
CP DB 5CK 5DB
CR DC 5CL 5DC
CS DD 5CM 5DD
CT DE 5CN 5DE
CU DF 5CO 5DF
CV DH 5CP 5DG
CW DJ 5CQ 5DH

5CR 5OJ
5CS

MODEL

Y ORK INTERNA TIONAL 3

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CONTROL
CENTER

SECTION 1

DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERA TION

COMPRESSOR

MOTOR

PRE-ROT ATION

DISCHARGE LINE

27385A

COOLER

VANE
ACTUA T OR

FIG. 1 – MODEL YK MILLENNIUM CHILLER

SYSTEM OPERATION DESCRIPTION (See Fig. 2)

The YORK Model YK Millennium Chiller is commonly
applied to large air conditioning systems, but may be
used on other applications. The chiller consists of an
open motor mounted to a compressor (with integral
speed increasing gears) condenser, cooler and flow
control chamber.

The chiller is controlled by a modern state of the art
MicroComputer Control Center which monitors its op­eration. The Control Center is programmed by the op­erator to suit job specifications. Automatic timed start­ups and shutdowns are also programmed to suit
nighttime, weekends, and holidays. The operating sta­tus, temperatures, pressures, and other inf ormation per­tinent to operation of the chiller are automatically dis­played and read on a 40 character alphanumeric
message display. Other displays can be observed by
pressing the keys as labeled on the Control Center.
The chiller with the MicroComputer Control Center is
applied with an electro-mechanical starter, YORK Solid
State Starter (optional), or Variable Speed Drive (op­tional).

OIL RESERVOIR/
PUMP

CONDENSER

In operation, a liquid (water or brine to be chilled) flows
through the cooler, where boiling refrigerant absorbs
heat from the water. The chilled liquid is then piped to
fan coil units or other air conditioning terminal units,
where it flows through finned coils, absorbing heat from
the air. The warmed liquid is then returned to the chiller
to complete the chilled liquid circuit.

The refrigerant vapor, which is produced by the boiling
action in the cooler, flows to the compressor where the
rotating impeller increases its pressure and tempera­ture and discharges it into the condenser. W ater flowing
through the condenser tubes absorbs heat from the re­frigerant vapor, causing it to condense. The condenser
water is supplied to the chiller from an external source,
usually a cooling tower . The condensed refrigerant drains
from the condenser into the flow control chamber, where
the flow restrictor meters the flow of liquid refrigerant
to the cooler to complete the refrigerant circuit.

The major components of a chiller are selected to handle
the refrigerant which would be evaporated at full load

27382A

4 YORK INTERNA TIONAL

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7619A(D)

DET AIL A – COMPRESSOR PRER O TATION V ANES

FORM 160.49-O2

design conditions. Howev er, most systems will be called
upon to deliver full load capacity for only a relatively
small part of the time the unit is in operation.

CAPACITY CONTROL

The major components of a chiller are selected for full
load capacities, therefore capacity must be controlled to
maintain a constant chilled liquid temperature leaving
the cooler. Prerotation vanes (PRV), located at the en­trance to the compressor impeller, compensate f or varia­tion in load (See Fig. 2. Detail A).

The position of these vanes is automatically controlled
through a lever arm attached to an electric motor lo­cated outside the compressor housing. The automatic
adjustment of the vane position in effect provides the
performance of many different compressors to match
various load conditions from full load with vanes wide
open to minimum load with vanes completely closed.

COMPRESSOR

DISCHARGE

DISCHARGE
BAFFLE

CONDENSER

SUB-COOLER

FLOW CONTROL
ORIFICE

PREROT A TION V ANES
(See Detail A)

SUCTION

COOLER

ELIMINA TOR

LD00924

FIG. 2 – REFRIGERANT FLOW-THRU CHILLER

Y ORK INTERNA TIONAL 5

OIL COOLER

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SECTION 2

MICROCOMPUTER CONTROL CENTER

26879A

LD00953

FIG. 3 – MICROCOMPUTER CONTR OL CENTER AND KEYPAD

NOTE: This instruction covers operation of chillers equipped with Electro-Mechanical or Solid State Starters. If chiller

is equipped with Variable Speed Drive, Form 160.00-O1 is to be used in conjunction with this manual.

WARNING

This equipment generates, uses and can radiate radio frequency energy and if not installed and used in accor­dance with the instructions manual, may cause interference to radio communications . Operation of this equip­ment in a residential area is likely to cause interference in which case the user at his own expense will be
required to take whatev er action ma y be required to correct the interf erence .

Additionally , any electronic equipment can generate EMI (electromagnetic interf erence) which, depending upon
the installation and magnitude, may affect other electronic equipment. The amount of EMI generated is deter­mined by the source inductance, load inductance, and circuit impedances. Responsibility for assuring the
satisfactory operation of other equipment included in the same power source as the YORK equipment rests
solely with the user. YORK disclaims any liability resulting from any interference or for the correction thereof.

6 YORK INTERNA TIONAL

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INTRODUCTION

FORM 160.49-O2

The YORK MicroComputer Control Center is a micro­processor based control system for R-22 or R134a cen­trifugal chillers. It controls the lea ving chilled water tem­perature via pre-rotation vane control and has the ability
to limit motor current via control of the pre-rotation vanes.
Further, it is compatible with YORK Solid State Starter
(optional), Variable Speed Drive (optional), and electro­mechanical starter applications.

A keypad mounted on the front of the Control Center
(see Fig. 3) allo ws the operator to displa y system oper­ating parameters on a 40 character alphanumeric dis­play that is part of the keypad. These readings are dis­played via “Display” keypad as follows: (In the English
mode; temperatures in °F, pressures in (PSIG) (in the
metric mode, temperatures in °C, Pressures in KP a).

If unit is equipped with EPROM version C.02F(T).12 or
later, the Control Center can be equipped with an op­tional Chinese language display, either as a field retrofit
or factory supplied option on new units. This display
mounts on the control center door, directly above the
standard display. Both the standard and Chinese dis­play will be present, providing displa y messages simul­taneously in both English and Chinese language.

The system setpoints (see Fig. 3) are operator entered
on the front control center Setpoints keypad. These
setpoints can also be displayed on the 40 char acter al­phanumeric display. The system setpoints are:

• CHILLED LIQUID TEMPERATURE (LCWT)

• % CURRENT LIMIT

• PULLDOWN DEMAND LIMIT

• CLOCK (TIME-OF-DAY)

• DAILY SCHEDULE (7 DAY TIME-CLOCK PROGRAM­MING)

• HOLIDAY

• REMOTE RESET TEMPERATURE RANGE

• DATA LOGGER

• CONDENSER REFRIGERANT LEVEL

The cause of all system shutdowns (safety or cycling) is
preserved (until the system is reset or restarts) in the
microcomputer’s memory for subsequent viewing on the
keypad display. The operator is continually advised of
system operating conditions by various background and
warning messages. The keypad contains special ser­vice keys for use by the service technician when per­forming system troubleshooting.

The Control Center must be configured for Chinese dis­play by a qualified service technician. Instructions are
contained in YORK service manual, Form 160.49-M3.

• CHILLED LIQUID TEMPERATURES – LEAVING AND
RETURN

• REFRIGERANT PRESSURES – EVAPORATOR AND
CONDENSER

• DIFFERENTIAL OIL PRESSURE

• CONDENSER LIQUID TEMPERATURES – OPTIONAL
FIELD INSTALLED – LEAVING AND RETURN

• OPTIONS

• PRINT *

• HISTORY PRINT *

• MOTOR CURRENT IN % OF FULL LOAD AMPS

• SA TURA TION TEMPERA TURES – EV APORATOR AND
CONDENSER

• DISCHARGE TEMPERATURE

• OIL TEMPERATURE

• HIGH & LOW OIL PRESSURE TRANSDUCER PRES­SURE

• SOLID ST ATE STARTER MOTOR CURRENT / VOLTS
(When Supplied)

• CONDENSER REFRIGERANT LEVEL

The MicroComputer Control Center is designed to be
compatible with most Energy Management Systems

(EMS) in use today. The standard design allows for the
following EMS interface:

1. Remote Start

2. Remote Stop

3. Remote LCWT Setpoint (Pulse Width Modulated sig­nal)

4. Remote Current Limit Setpoint (Pulse Width Modulated
signal)

5. A “Remote Mode Ready to Start” Status Contacts

6. Safety Shutdown Status Contacts

7. Cycling Shutdown Status Contacts

As an enhancement to the standard EMS features, an
optional card file with plug-in printed circuit boards is
available. These optional cards will accept a remote
LCWT 0 to 10°F or 0 to 20°F setpoint offset and/or re­mote current limit setpoint interface from three user in­put choices.

1. 4-20mA

2. 0-10VDC

* These ke ys provide a print-out when the customer connects a com-

patible printer to the Micro Board RS-232 serial port. (See Form

160.49-N7.)

Y ORK INTERNA TIONAL 7

3. Contact Closures

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CONTROL CENTER

The Control Center front panel layout consists of five
key groups, one switch and a 1 line by 40 character al­phanumeric vacuum fluorescent display: (see Fig. 3.)

CHARACTERISTIC DISPLAY – The alphanumeric
vacuum fluorescent display is located to the right of the
ST ATUS key . All messages, parameters, set points, and
data can be viewed at this location. The main communi­cations between the operator or service technician and
the MicroComputer Control Center occurs on this dis­play.

DISPLAY – Provide a direct readout of each monitored
parameter on the alphanumeric display.

ENTRY – These keys are used to enter the values for
the operator programmed setpoints. These k eys are used
in conjunction with the Setpoint keys while in PRO-

GRAM mode.

SETPOINTS – These keys are used as follows:

1. To view each setpoint, in any mode , or

2. To select the individual setpoints that are prog rammed
by the operator in PR OGRAM mode only.

Pressing the appropriate key enables the operator to
program that setpoint pressing the Entry keys.

SERVICE– Included in this group of keys are those func­tions that are only relevant to servicing the chiller .

Typically, these keys would not be used for daily chiller
operation.

ACCESS CODE – Permits operator to access the pro­gram.

PROGRAM – Permits operator to program the Control
Center.

MODE – P ermits operator to check what mode the Con­trol Center is presently in (LOCAL, REMOTE or SER-
VICE).

1. Service – allows manual PRV control with visual
display readout of PRV operation.

2. Local – allows manual compressor start from the
COMPRESSOR switch on the Control Center front.

3. Program – allows operator programming of system
setpoints.

4. Remote – allows remote start, remote stop of com­pressor and remote reset of LCWT and % current
limit.

COMPRESSOR-START, RUN, STOP/RESET
SWITCH – This 3-position rocker s witch is used to start
(except in REMO TE mode), stop/run/reset the system.

OPERATION

DISPLA YING SYSTEM PARAMETERS

The Display keys are used to display selected
monitored parameters as follows: (Refer to Fig. 3.)

• Press and release the appropriate Display ke y – the
message will be displayed f or 2 seconds.

– or –

• Press and hold the appropriate Display key – the mes­sage will be displayed and updated every 0.5 sec­onds until the Display ke y is released.

– or –

• Press and release appropriate Display key , then press
and release the DISPLAY HOLD key – the message

8 YORK INTERNA TIONAL

will be displayed and updated every 2 seconds until
the DISPLAY HOLD key is again pressed and re-
leased, or 10 minutes have elapsed, whiche ver comes
first.

NOTE: If the display actually displays X’s, then the

monitored parameter is out of normal operat­ing range (refer to Fig. 4). If the “English/Metric”
jumper is installed on the Micro Board, all tem­peratures are displayed in degrees F ahrenheit
(°F) and all pressures are displayed in pounds
per sq. inch gauge (PSIG) except oil pressure
which is displayed in pounds per sq. inch diff er­ential (PSID). If the “English/Metric” jumper is
not installed, all temperatures are displayed in
degrees Centigrade (°C) and all pressures are
displayed in Kilo-Pascals (kPa).

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FORM 160.49-O2

DISPLAY

READS

CONDENSER PRESS. = < 6.8 PSIG, or > 300 PSIG XX.X PSIG
EVAPORATOR PRESS. = < 50 PSIG, or > 125 PSIG XX.X PSIG
EVAP. PRESS. (BRINE) = < 25 PSIG, or > 100 PSIG XX.X PSIG
HOP TRANSDUCER = < 59.1 PSIG, or > 314.9 PSIG XX.X PSIG
LOP TRANSDUCER = < 23.2 PSIG, or > 271.8 PSIG XX.X PSIG
DISCHARGE TEMP. = < 20.3°F; > 226.4°F XXX.X°F
OIL TEMP. = < 20.3°F; > 226.4°F XXX.X°F

LEAVING CONDENSER
WATER TEMP.
ENTERING CONDENSER
WATER TEMP.

LEAVING EVAPORATOR = < 0°F XX.X°F
WATER TEMP. = > 81.1°F XX.X°F

ENTERING EVAPORATOR = < .1°F XX.X°F
WATER TEMP. = > 93°F XX.X°F

= < 8.4°F; > 134.1°F XXX.X°F

= < 8.4°F; > 134.1°F XXX.X°F

FIG. 4 – SYSTEM PARAMETERS – OUT OF

RANGE READINGS

To Display CHILLED LIQUID TEMPERATURES:

______ PSID = (HOP – LP) – OFFSET PRESSURE
OFFSET PRESSURE: Pressure differential between

the HOP transducer and LOP transducer outputs dur­ing a 3 second period beginning 10 seconds after the
start of “START SEQUENCE INITIATED”. During this
time, the transducers will be sensing the same pres­sure and their outputs should indicate the same pres­sure. However, due to accuracy tolerances in trans­ducer design, differences can exist. Therefore, to com­pensate for differences between transducers and as­sure differential pressure sensing accuracy, the OFF-
SET PRESSURE is subtracted algebraically from the
differential pressure. The offset pressure calculation
will not be performed if either transducer is out-of-range.
The offset value will be taken as 0 PSI in this instance.

To Display OPTIONS:

This key is not used.

NO OPTIONS INSTALLED

is displayed when this key is pressed.

Press CHILLED LIQUID TEMPS displa y key as de-
scribed on page 7 to produce the following alphanu­meric display message:

CHILLED LEA VING = XXX.X°F, RETURN = XXX.X°F

To Display REFRIGERANT PRESSURE:

Use REFRIGERANT PRESSURE display key as
described on page 7 to produce the following alpha­numeric display message:

EV AP = XXX.X PSIG; COND = XXX.X PSIG

To Display OIL PRESSURE:

Use OIL PRESSURE display key as described on
page 7 to produce the following alphanumeric dis­play message:

OIL PRESSURE = XXXX.X PSID

The differential pressure displayed is the pressure dif­ference between the high side oil pressure transducer
(output of oil filter) and the low side oil pressure trans­ducer (compressor housing). Displayed value includes
offset pressure derived from auto-zeroing during
“START SEQUENCE INITIATED”. If either transducer
is out-of-range, XX.X is displayed. Oil pressure is
calculated as follows:

To Display SSS MOT OR CURRENT / VOLTS:
(Solid State Starter Applications Only)

If chiller is equipped with a Y ORK Solid State Starter,
use SSS MOTOR CURRENT / VOLTS key to dis-
play 3-phase compressor motor current and 3-phase
Solid State Starter input line voltage.

Continuously pressing this key will display the mo­tor current and line voltage alternately. When used
with the DISPLAY HOLD key, motor current and
line voltage will alternately be displayed each time
this key is pressed. The messages are as follows:

A AMPS = XXXX; B AMPS = XXXX; C AMPS = XXXX
V A-B = XXXX; V B-C = XXXX; V C-A = XXXX

If chiller is not equipped with a Solid State Starter,
this key produces the following message:

SOLID STATE STARTER NOT INSTALLED

In PROGRAM mode, this k ey is used to displa y the
applicable line voltage range (200-208VAC, 220­240V AC , 380VAC, 400V A C , 415V A C , 440-480V A C,
500-600V AC, Supply V oltage Range Disab led). The
correct line voltage range is programmed at the
YORK factory and is checked by the service tech­nician at start-up. For security reasons, a special
access code is required to program the line volt­age range. The line voltage range is used to deter­mine a low line voltage threshold for cycling shut­down. Refer to “System Setpoints” for Trip/Reset
values.

Y ORK INTERNA TIONAL 9

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To Display CONDENSER LIQUID TEMPERATURES

(Field Installed Option Package):

Use CONDENSER LIQUID TEMPS display key as
described above to produce the follo wing alphan u­meric display message:

Computer Control Center”, page 14. However,
the purpose of the OPERATING HOURS key
is to display the total accumulated chiller run
time. Therefore, the operating hours should not
be arbitrarily reset.

SYSTEM SETPOINTS

COND LEAVING = XXX.X°F; RETURN = XXX.X°F

NOTE: If the condenser liquid thermistors are not con-

nected, or both thermistors are “out of range”,
the display will blank when this k e y is pressed.

To Initiate a PRINT to Printer:

Press the PRINT key to initiate a printout to an op­tional printer. When the key is pressed,

PRINT ENABLE

is displayed.

Refer to “MicroComputer Control Center – System
Status Printers” instruction, Form 160.49-N7 for de­tails of the optional printers.

To Display MOTOR CURRENT:

Press the % MOTOR CURRENT display key as
described above to display motor current as a per­cent of Full Load Amps (FLA). The message is as
follows:

MOTOR CURRENT = XXX% FLA

The system setpoints may be programmed by the sys­tem operator. The Setpoints keys are located on the
Control Center keypad (see Fig. 3). To program, see “Pro­gramming System Setpoints”, page 14. The following
is a description of these setpoints (with the English/
Metric jumper installed on the Micro Board):

CHILLED LIQUID TEMP – This key displays the leav­ing chilled water temperature (LCWT) setpoint in degrees
Fahrenheit. If not progr ammed, the default value is 45°F.
See “Programming System Setpoints”, page 15).

NOTE: If an Energy Management System is interfaced

to the Control Center for the purpose of remote
LCWT setpoint reset, then the operator-pro­grammed chilled liquid temperature will be the
base or lowest setpoint av ailable to the Energy
Management System (EMS). This chilled liquid
temperature value must also be entered into the
EMS. Further, any subsequent change to this
value must also be entered into the EMS.

% CURRENT LIMIT – This key displays the maximum
value of motor current permitted by its programmed set­ting. The value is in terms of percent of Full Load Amps
(FLA). If not programmed, the def ault value is 100%. (See
“Programming System Setpoints”, page 15.)

NOTE: • Liquid-Cooled Solid State Starter Applications

– the % Motor Current displayed is the highest
of three line currents divided by the programmed
chiller FLA value x 100%.

• Electro-Mechanical Starter Applications – the
% Motor Current displayed is the highest of the
three line currents.

If chiller is equipped with a YORK Solid State Starter,
the system FLA is also displayed. This value is pro­grammed by the f actory and should nev er be changed.
The Micro Board uses this value to calculate and dis­play the % motor current parameter that is displayed
when the % MOT OR CURRENT display ke y is pressed.
Also, proper current limit control depends on the cor­rectly programmed FLA value. For security reasons, a
special access code is required to program the FLA value.
It should only be changed by a service technician.

To Display OPERATING HOURS and STARTS
COUNTER:

Use the OPERA TING HOURS ke y as described on
page 8, to produce the following message:

OPER. HOURS = XXXXX; START COUNTER = XXXXX

PULL DOWN DEMAND – This function is used to pro­vide energy savings following the chiller start-up. This
key displays a programmable motor current limit and a
programmable period of time. Operation is as follows:
Whenever the system starts, the Pull Down Demand
Limit is maintained for the programmed time, then the
current limit control returns to % current limit setpoint.

NOTE: The operating hours and starts counter can be

reset to zero. Ref er to “Progr amming the Micro-

The maximum permitted motor current is in terms of %
FLA. The duration of time that the current is limited is in

10 YORK INTERNA TIONAL

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FORM 160.49-O2

terms of minutes (to a maximum of 255). If not pro­grammed, the default value is 100% FLA for 00 min­utes. (See “Programming Systems Setpoints”, page 16.)
Thus, no pull down demand limit is imposed following
system start, and the % current limit setpoint is used.

CLOCK – This key displa ys the day of the week, time of
day and calendar date. If not programmed, the default
value is

SUNDAY 12:00 AM 1/1/92 .

(See “Programming System Setpoints”, page 16.)

DAIL Y SCHEDULE – This key displays the programmed
daily start and stop times, from Sunday thru Saturday
plus Holiday. If desired, the Control Center can be pro­grammed to automatically start and stop the chiller as
desired. This schedule will repeat on a 7-day calendar
basis. If the Daily Schedule is not progr ammed, the de­fault value is 00:00 AM start and stop times for all da ys
of the week and the holiday. (Note that the system will
not automatically start and stop on a daily basis with
these default values because 00:00 is an “Impossible”
time for the Micro Board. See “Programming System
Setpoints”, page 17.) Finally, one or more days in the
week can be designated as a holiday (see description
under HOLIDAY setpoint) and the Control Center can
be programmed (usually Daily Schedule setpoint) to
automatically start and stop the chiller on those days so
designated. The operator can override the time clock
at any time using the COMPRESSOR switch.

For additional information on remote LCWT reset, refer
to Form 160.49-PW13.

NOTE: If an Energy Management System is interfaced

to the Control Center for the purpose of remote
LCWT setpoint reset, then the operator pro­grammed REMOTE RESET TEMP RANGE
value determines the maximum value of tem­perature reset controlled by the Energy Man­agement System.

DATE LOGGER – This key is used when an optional
printer is connected to the MicroComputer Control Cen­ter. Refer to Form 160.49-N7 for operation instructions.

SSS MOT OR CURRENT/VOLTS – This key is used on
Solid State Starter applications only. Although this is a
display key, it is used to program the applicable AC
power line voltage range (380VAC, 400VAC, 415VAC,
440-480VAC, 550-600VAC). The MicroComputer Con­trol Center uses this entry to determine the under-volt­age and overvoltage shutdown threshold. For each
line voltage category, there is an undervoltage and ov­ervoltage shutdown threshold. If the AC po wer line v olt­age exceeds these thresholds for 20 continuous sec­onds, the chiller shuts down and displays

MON 10:00 AM LOW LINE VOLTAGE

– or –

Note that if only a start time is entered for a particular
day, the compressor will not automatically stop until a
scheduled stop time is encountered on a subsequent
day.

HOLIDAY – This key indicates which da ys in the upcom­ing week are holidays. On those designated days, the
chiller will automatically start and stop via the holiday
start and stop times programmed in the DAIL Y SCHED-
ULE setpoint. It will do this one time only and the f ollow­ing week will rev ert to the normal daily schedule for that
day.

REMOTE / RESET TEMP RANGE – This key displays
the maximum offset of remote LCWT setpoint reset. This
offset is either 10° or 20°F as programmed. When in the
REMOTE mode, this v alue is added to the operator pro­grammed CHILLED LIQUID TEMP setpoint and the sum
equals the temperature range in which the LCWT can
be reset. For example, if the operator programmed
CHILLED LIQUID TEMP setpoint is programmed with a
value of 10°F, then the CHILLED LIQUID TEMP setpoint
can be remotely reset over a range of 46°F to 56°F (46
+ 10 = 56). If not prog rammed, the default value for this
parameter is 20°F.

MON 10:00 AM HIGH LINE V OLTAGE

This overvoltage and undervoltage protection can be
disabled. Ref er to chart below:

LOW / HIGH LINE VOLTAGE TRIP / RESET VALUES

COMPRESSOR

MOT OR

SUPPL Y VOL TA GE

RANGE – (V)

380 305 331 415 414
400 320 349 436 435

415 335 362 454 453
440-480 370 400 524 523
550-600 460 502 655 654

Supply V oltage

Range Disabled

LOW LINE VOL TAGE HIGH LINE V O LTAGE

OPERA TING POINT OPERATING POINT

CUTOUT -(V) CUTIN-(V) CUTOUT -(V) CUTIN-(V)

(

ON FALL) (ON RISE) (ON RISE) (ON FALL)

NONE 0 NONE 0

For security reasons, a special access code is required
to program the supply voltage range. The supply voltage
range is programmed at the factory and should only be
changed by a service technician.

Y ORK INTERNA TIONAL 11

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DISPLAYING SYSTEM SETPOINTS

The currently programmed Setpoint values can be
viewed at any time (see page 22) in SER VICE, LOCAL
or REMOTE operating mode as follo ws:

• Press and release the appropriate Setpoint key – the
message will be displayed f or 2 seconds.

– or –

If chiller is equipped with a YORK Solid State Starter,
the message is:

CURRENT LIMIT = XXX % FLA; *MTR CUR = 000 FLA

NOTE: On Solid State Starter applications, this value is

programmed at the YORK factory . A special ac­cess code is required.

• Press and hold the appropriate Setpoint key – the
message will be displayed as long as the key is
pressed.

– or –

• Press and release the appropriate Setpoint key , then
press and release the DISPLA Y HOLD k ey . The mes­sage will be displayed until the DISPLAY HOLD key is
again pressed and released, or 10 minutes have
elapsed, whichever comes first.

To Display CHILLED LIQUID TEMP Setpoint:

Use CHILLED LIQUID TEMP setpoint key as de-
scribed on page 10 to produce the following mes­sage:

LEAVING SETPOINT = XX.X °F

NOTE: The value displayed is the actual LCWT setpoint.

For example , the value display ed in LOCAL

or

PROGRAM modes is that which is oper ator pro­grammed. The v alue displayed in the REMOTE
mode is that base setpoint with added tempera­ture reset by an Energy Management System,
via remote LCWT setpoint (PWM signal) if a re­mote reset signal was received within 30 min­utes.

To Display PULL DOWN DEMAND Setpoint:

Use PULL DOWN DEMAND setpoint key as de-
scribed on page 10 to produce the following mes­sage:

SETPOINT = XXX MIN @ XX % FLA XXX MIN LEFT

To Display CLOCK Setpoint (Time of Day):

Use CLOCK setpoint key as described above to
produce the following message:

TODAY IS DAY XX:XX AM/PM 1/1/92

To Display DAILY SCHEDULE Setpoints:

• Press and hold the DAILY SCHEDULE setpoint key.
The chiller start and stop times for each day of the

week are sequentially display ed, beginning with Sun­day and ending with Holida y. The displa y will continu­ously scroll until the DAILY SCHEDULE key is re-
leased.

– or –

• Press and release the DAIL Y SCHEDULE setpoint k ey .
Then press and release the DISPLA Y HOLD k ey . The

To Display % CURRENT LIMIT Setpoint:

Use % CURRENT LIMIT setpoint key as described
above to produce the f ollowing message:

CURRENT LIMIT = XXX % FLA

chiller start and stop times for each day of the week
are sequentially displayed beginning with Sunda y and
ending with Holiday . The display will continuously scroll
until the DISPLAY HOLD key is again pressed and
released, or 10 minutes have elapsed, whichever
comes first.

NOTE: The value display ed is the actual % current limit

setpoint. For example, the value displayed in
LOCAL or PROGRAM mode is that which is
operator programmed. The value displayed in
the REMOTE mode is that which has been pro-
grammed by the Energy Management System
via the remote current limit setpoint input.

The display message for DAILY SCHEDULE will scroll
in the following sequence:

SUN START = 08:30 AM STOP = 06:00 PM
MON START = 05:00 AM STOP = 07:00 PM

12 YORK INTERNA TIONAL

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TUE START = 05:00 AM STOP = 07:00 PM

FORM 160.49-O2

WED START = 05:00 AM STOP = 07:00 PM
THU START = 05:00 AM STOP = 07:00 PM
FRI START = 05:00 AM STOP = 07:00 PM
SAT STAR T = 05:00 AM STOP = 01:00 PM
HOL START = 00:00 AM STOP = 00:00 PM

To Display HOLIDAY Setpoints:

Use HOLIDAY setpoint key as described in the be-
ginning of this section to produce the following mes­sage:

S_ M_ T_ W_ T_ F_ S_ HOLIDAY NOTED BY *

NOTE: On the days that are designated by an *, the

chiller will automatically start and stop per the
holiday schedule established in D AIL Y SCHED-
ULE setpoints.

To Display UNDERVOLTAGE setpoints:
(Solid State Starter Applications Only)

Press SSS MOTOR CURRENT/V OL TS key in PRO-
GRAM mode to display the selected voltage range.
One of the following messages will be displa yed.

SUPPLY VOLTAGE RANGE 380

– or –

SUPPLY VOLTAGE RANGE 400

– or –

SUPPLY VOLTAGE RANGE 415

– or –

SUPPLY VOLTAGE RANGE 440-480

– or –

SUPPLY VOLTAGE RANGE 550-600

– or –

To Display REMOTE RESET TEMP RANGE Setpoint:

Use REMOTE RESET TEMP RANGE setpoint ke y
as described above to produce the following mes­sage:

REMOTE RESET TEMP RANGE = 10°F

– or –

REMOTE RESET TEMP RANGE = 20°F

To Display DATA LOGGER setpoints:

Refer to Y ORK, F orm 160.49-N7 for operation of this
key .

SUPPLY VOLTAGE RANGE DISABLED

A special access code is required to program the Sup­ply Voltage Range. The Supply Voltage Range is pro­grammed at the factory and check ed at system start-up.
(Note to service technician: Refer to programming in­structions in Service Instruction, Form 160.49-M3.)

Y ORK INTERNA TIONAL 13

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PROGRAMMING

THE MICROCOMPUTER CONTROL CENTER

PROGRAMMING SYSTEM SETPOINTS

The system setpoints can be entered at any time . . . . .

even when the system is running. Proceed as f ollows to
enter system setpoints. (Ref er to Fig. 5.)

1. Press ACCESS CODE key .

2.

ENTER VALID ACCESS CODE _ _ _ _

3. Using ENTRY keys, enter 9 6 7 5.

4. As each digit is entered, the characters Y O R K are
displayed.

is displayed.

NOTE: If digits other than 9 6 7 5 are entered,

YORKis still displayed.

NOTE: For ease in remembering the code, note that

the letters YORKcorrespond to the dig­its 9675on a telephone dial

.

5. Press ENTER key.
NOTE: If digits other than 9675 w ere entered in step

No. 4,

INVALID ACCESS CODE

is displayed
when the ENTER key is pressed. If this oc­curs, enter the correct access code (9675)
and proceed.

6.

ACCESS TO PROGRAM KEY AUTHORIZED

is displayed.

NOTE: Unless terminated by pressing the ACCESS

CODE key again, the operator will have ac­cess to the PROGRAM key for 10 minutes.
When 10 minutes have elapsed, access to
PROGRAM key will be automatically disab led
and the operator must return to step No. 1 to
gain access.

7. Press PROGRAM key .

8.

PROGRAM MODE, SELECT SETPOINT

is displayed.

LD00954

FIG. 5 – KEYPAD – PROGRAMMING SYSTEM

SETPOINTS

9. Enter setpoints as detailed below. If you make a mis­take when entering a value, press CANCEL k ey and
then ENTER key . The display will re vert to the default
values and the cursor will return to the first change­able digit. You can then proceed to enter the correct
values. If the entered v alue exceeds acceptab le lim­its,

OUT OF RANGE – TRY AGAIN!

message will be displayed for 2 seconds, then the

PROGRAM MODE, SELECT SETPOINT

message will re-

appear.

10.When all the desired setpoints have been entered,
press the ACCESS CODE key to exit PROGRAM
mode and terminate access to PROGRAM mode.

ACCESS TO PROGRAM MODE DISABLED

is displayed.
The Control Center will automatically return to LO-

CAL, REMOTE or SERVICE mode . . . . whichever

was last selected.

14 YORK INTERNA TIONAL

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To enter CHILLED LIQUID TEMP Setpoint: (Refer to
Fig. 6.)

1. Press and release CHILLED LIQUID TEMP setpoint
key. The following program prompt message will be
displayed:

LEAVING SETPOINT = XX.X °F (BASE)

(BASE) refers to the base or lowest setpoint avail­able to an Energy Management System. If an y En­ergy Management System is applied, this value must
be entered into the Energy Management System.
Refer to previous explanation or REMO TE/RESET
TEMP RANGE, page 11.

FORM 160.49-O2

2. Use ENTRY keys to enter desired v alue.

3. Press and release ENTER key.

PROGRAM MODE, SELECT SETPOINT

message is displayed.

To Enter % CURRENT LIMIT Setpoint:
(Electro-Mechanical Starter , ref er to Fig. 7)

1. Press and release % CURRENT LIMIT setpoint key .
The following program prompt message is displa yed:

CURRENT LIMIT = XXX% FLA

2. Use ENTRY k e ys to enter desired v alue .

3. Press and release ENTER key.

PROGRAM MODE, SELECT SETPOINT

message is displayed.

LD00955

FIG. 6 – KEYPAD – PROGRAMMING “LEAVING

CHILLED WATER TEMP” SETPOINT

3. Press and release ENTER key.

PROGRAM MODE, SELECT SETPOINT

message is displayed.

(Solid State Starter, ref er to Fig. 7)

1. Press and release % CURRENT LIMIT setpoint key .
The following program prompt message is displa yed:

CURRENT LIMIT = XXX% FLA; MTR CUR = _ _ _ FLA

2. Use ENTRY k e ys to enter desired v alue .
NOTE: Motor Current FLA value is entered by Y ORK

LD00956

factory and checked at system start-up. It
cannot be changed without special access
code. (Note to service technician: refer to

FIG. 7 – KEYPAD – PROGRAMMING “% CURRENT

LIMIT” SETPOINT

“Programming Instructions” in Service in­struction, Form 160.49-M3.

Y ORK INTERNA TIONAL 15

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To Enter PULL DOWN DEMAND Setpoint:
(Refer to Fig. 8.)

1. Press and release PULL DOWN DEMAND setpoint
key. The following program prompt message is dis­played:

SETPOINT = XXX MIN @ XXX % FLA, XXX MIN LEFT

2. Use Entry keys to enter desired values. For expla­nation, see PULL DOWN DEMAND, page 12. Note
that “XX min left” is not an operator entered v alue .

3. Press and release ENTER key.

PROGRAM MODE, SELECT SETPOINT

message is displayed.

LD00957

FIG. 8 – KEYPAD – PROGRAMMING “PULL DO WN

DEMAND” SETPOINT

To Enter CLOCK Setpoint: (Refer to Fig. 9.)

1. Assure Micro Board Program jumper J57 is in
“CLKON” position.

2. Press and release CLOCK setpoint key. The f ollo w-
ing program prompt message is displayed:

TOD AY IS MON 10:30 PM 1/1/92

3. Press ADVANCE DAY / SCROLL key until the pro-
gram per day of week appears on the display.

4. Use Entry keys to enter proper time of day.

5. Press AM/PM key to change the AM to PM or vice
versa.

6. Use Entr y keys to enter proper calendar date,
(MONTH/DA Y/YR). If month and da y are single digit
entries, precede the entry with “0”. For example,
02/04/88.

7. Press and release ENTER key.

PROGRAM MODE, SELECT SETPOINT

message is displayed.

LD00958

FIG. 9 – KEYPAD – PROGRAMMING “CLOCK”

SETPOINT

16 YORK INTERNA TIONAL

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FORM 160.49-O2

To Enter DAILY SCHEDULE Setpoint:
(Refer to Fig. 10.)

1. Press and release DAILY SCHEDULE setpoint key.
The following prompt message is displa yed:

SUN START = XX:XX AM, STOP = XX:XX AM

2. If the displayed start and stop time is not the desired
schedule, enter the desired start and stop times as
follows:

a. If you do not want the chiller to automatically start

and stop on this day, press CANCEL key.

b. Use the Entry keys to enter desired hours and

minutes start time.

c. If necessary, press the AM/PM ke y to change “AM”

to “PM” or vice versa.

d. Use the Entry keys to enter desired hours and

minutes stop time.

e. If necessary , press the AM/PM key to change “AM”

to “PM” or vice versa.

3. Press and release ADV ANCE D A Y/SCROLL ke y. The
following prompt message is displa yed:

6. Use the ADV ANCE DAY / SCROLL key with proce-
dure in Step 2. To enter start and stop times for
remainder of the week plus a holiday schedule if
required.

7. Press the ENTER key.

PROGRAM MODE, SELECT SETPOINT

is displayed.

MON START = XX:XX AM, STOP = XX:XX AM

4. Enter the desired start and stop time per Step 2.

5. Press and release ADV ANCE D A Y/SCROLL ke y. The
following prompt message is displa yed:

REPEAT MON SCHEDULE MON-FRI? YES = 1; NO = 0

a. If you press the 1 Entry key, Monday’s start and

stop time will be automatically entered for Tues­day through F riday.

– or –

b. If you press the 0 Entry key, Tuesday through Fri-

day can be programmed with different start and
stop times.

LD00959

FIG. 10 – KEYPAD – PROGRAMMING “DAIL Y

SCHEDULE” SETPOINT

Y ORK INTERNA TIONAL 17

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To Enter HOLIDAY Setpoint: (Refer to Fig. 11.)

1. Press and release HOLIDAY setpoint key. The fol-
lowing program prompt message is display ed:

S_ M_ T_ W_ T_ F_ S_ HOLIDAY NOTED BY

r

2. Press and release ADV ANCE DAY/SCR OLL k ey to
move cursor to the day that y ou wish to designate as
a holiday .

3. Press and release r entry key. An r will appear
next to the selected day.

4. After you have placed an r n ext to each of the da ys
that you wish to designate a holiday, press ENTER
key

PROGRAM MODE, SELECT SETPOINT

message is displayed.
T o cancel all of the designated holidays: perform Step

1, press CANCEL key, and then press ENTER key.

PROGRAM MODE, SELECT SETPOINT

message is displayed.
To cancel one of the designated holidays: perform

Step 1, press ADVANCE DAY / SCROLL key until
the cursor appears to the right of the desired day,
press the r key, then press the ENTER key.

LD00961

FIG. 11 – KEYPAD – PROGRAMMING “HOLIDAY”

SETPOINT

To Enter REMOTE/ RESET TEMP RANGE Setpoint:
(Refer to Fig. 12.)

1. Press and release REMOTE/RESET TEMP RANGE
setpoint key . The following program prompt message
is displayed:

REMOTE TEMP SETPOINT RANGE = XX °F

2. Use Entry keys desired value (10 or 20).

3. Press and release ENTER key.

PROGRAM MODE, SELECT SETPOINT

message is displayed.

To Enter DA TA LOGGER Setpoint:
Refer to F orm 160.49-N7 for operation of this k e y.

LD00962

FIG. 12 – KEYPAD – PROGRAMMING “REMO T E

RESET” TEMP RANGE

18 YORK INTERNA TIONAL