York MILLENNIUM User manual

MILLENNIUM
®
REMOTE CONTROL CENTER
OPERATORS GUIDE
29535A
OPERATING INSTRUCTIONS
Millennium
®
REMOTE CONTROL CENTER
YCAL CHILLERS AND YCUL CONDENSING UNITS
New Release Form 150.62-NM3 (100)

2YORK INTERNATIONAL
TABLE OF CONTENTS
LIST OF TABLES PAGE
TABLE
1 Allowable Ranges for Cooling Setpoints and Control Ranges ....................... 10
LIST OF ILLUSTRATIONS
1 Printer to Microboard Electrical ..................................................................... 9
2 Field Wiring .................................................................................................... 12
3 Field Wiring .................................................................................................... 13
PAGE
FIGURE
Section 1 Operating Controls ...................................................................... 3
Introduction..................................................................................................... 3
Microprocessor Board ................................................................................ 3
40 Character Display .................................................................................. 3
Keypad........................................................................................................ 3
Status .......................................................................................................... 3
Display Print ............................................................................................... 3
Entry ........................................................................................................... 3
Setpoints ..................................................................................................... 3
Unit ............................................................................................................. 3
Communications ......................................................................................... 3
Section 2Status Messages ........................................................................... 4
General Status Messages ................................................................................ 4
Fault Status Messages ..................................................................................... 5
Unit Faults .................................................................................................. 5
System Faults.............................................................................................. 6
Section 3Unit Data ....................................................................................... 7
Operating Data Displays ................................................................................. 7
History Data .................................................................................................... 8
Data Printing ................................................................................................... 8
Optional Printer Installation............................................................................ 9
Parts................................................................................................................. 9
Assembly and Wiring...................................................................................... 9
Section 4Programmable Values .................................................................. 10
Cooling Setpoints............................................................................................ 10
Daily Schedule/Holiday .................................................................................. 11
Load Limiting ................................................................................................. 11
Remote Unit Run ............................................................................................ 11
Section 5Field Wiring .................................................................................. 12
PAGE

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YORK INTERNATIONAL
FORM 150.62-NM3
INTRODUCTION
The YORK Millennium Remote Control Center (RCC)
is a microprocessor-based control system capable of
remote chiller/condensing unit control. It is capable of
controlling cooling setpoints, load limit setpoint, daily/
holiday schedule, and the remote start/stop. Most unit
operational and history data is available on the RCC.
One RCC is needed for each chiller for remote moni-
toring or control.
A 40 character backlit LCD display (2 lines of 20 char-
acters) allows the operator to display system operating
parameters as well as access programmed information
already in memory. A keypad for chiller start/stop, pro-
gramming and accessing setpoints, pressures, tempera-
tures, cutouts, daily schedule, and fault information is
provided.
Microprocessor Board
The Microprocessor Board is the controller and deci-
sion maker in the control panel. This board has no in-
puts other than the RS-485 port. All communication
with the chiller will occur over the RS-485 port. All
printing will occur on the RS-232 port.
TheMicroprocessorBoarddoesnotcontain a Real Time
Clock integrated circuit chip with an internal battery
back up. Thus all values that are modifiable on the RCC
must be stored in the chiller’s battery backed RAM.
40 Character Display
The40CharacterDisplayisa liquid-crystal display used
for displaying system parameters and operator mes-
sages. The display has a lighted background for night
viewing as well as a special feature, which intensifies
the display for viewing in direct sunlight.
Keypad
An operator keypad allows complete control of the unit
from a remote location. The keypad offers commands
available to access displays, program setpoints, and ini-
tiate unit run commands. There are 5 divisions to the
keypad. They are outlined below.
Status –This section consists of the STATUS key and
the 40 character display. The STATUS key will be used
to display the current operating status of all systems on
the unit.
Display/Print –This section contains keys associated
with the display and printing of unit and system data.
OPERATING CONTROLS
Following is a list of keys in the Display section of the
keypad.
•OPER DATA
• PRINT
• HISTORY
Entry – This section contains the keys used for data
entry in the various program modes. These keys are as
follows.
• ENTER
• UP Arrow
• DOWN Arrow
Setpoints –This section contains keys for program-
ming the setpoint, schedule, and load limiting the unit.
These keys are as follows.
•Cooling Setpoints
• Set Schedule/Holiday
• Load Limit
Unit –This section contains two keys, one for turning
the unit on and one for turning the unit off.
Communications
The communications between the RCC and the Middle
Market Micropanel will be limited to once every 16
seconds. The Micropanel will ignore communications
for 15 seconds after processing a valid transmission.
The Micropanel will also ignore communications for
15 seconds after power is applied.
The Chiller Micropanel will use local control, if a valid
transmission has not been received for 5 minutes from
the RCC. The remote control will be used again once a
valid new transmission has been processed. The RCC
will display an error message indicating the communi-
cations problem when such a condition occur.
29535A
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4YORK INTERNATIONAL
Pressing the STATUS key will enable the operator to
determine the present operating status of the chiller.
The messages displayed will include running status,
cooling demand, fault status, external cycling device
status, load limiting and anti-recycle timer status. The
display will be a single message relating to the highest
priority message as determined by the microprocessor.
Status messages fall into the categories of General and
Fault Status with each of the categories discussed be-
low.
General Status Messages
Each of the general status messages with a description
ofitsmeaningwillfollow. Inthecaseofmessages which
apply to individual systems, SYS 1 and SYS 2 mes-
sages will both be displayed and may be different. SYS
2 messages will be blanked out on single system units.
For a more detailed explanation of each status message,
refer to the Unit Installation, Operation and Mainte-
nance Manual.
This message informs the operator that the UNIT switch
on the control panel is in the OFF position, which will
not allow the unit to run.
The DAILY SCHEDULE SHUTDOWN message indi-
cates that either the daily/holiday schedule programmed
is keeping the unit from running or the time is incor-
rectly set.
TheREMOTECONTROLLEDSHUTDOWN message
indicates that the RCC has turned the unit off, not al-
lowing it to run.
NO RUN PERM shows that either the flow switch (or
air proving switch) is open or a remote start/stop con-
tact is open in series with the flow switch.
STATUS MESSAGES
UNIT SWITCH OFF
SHUTDOWN
DA I LY SCHEDULE
SHUTDOWN
REMOTE CONTROLLED
SHUTDOWN
FLOW SWITCH/REM STOP
NO RUN PERM
SYS SWITCH OFF tells that the system switch on the
microboard is turned off. The system will not be al-
lowed to run until the switch is turned back on.
These messages inform the operator that the chilled liq-
uid temperature is below the point (determined by the
setpoint and control range) that the micro will bring on
a system or that the micro has not loaded the lead sys-
tem far enough into the loading sequence to be ready to
bring the lag system ON. The lag system will display
this message until the loading sequence is ready for the
lag system to start.
The COMPS RUNNING message indicates that the
respective system is running due to demand. The ‘X’
will be replaced with the number of compressors in that
system that are running.
The anti-recycle timer message is displayed when the
system is unable to start due the anti-recycle timer be-
ing active.
The anti-coincident timer message is displayed when
thesystemisunableto start due theanti-coincidenttimer
being active.
When this message appears, discharge pressure limit-
ing is in effect.
S YS 1 SYS SWI TCH OFF
S YS 2 SYS SWI TCH OFF
S YS 1 NO COOL LOAD
S YS 2 NO COOL LOAD
S YS 1 COMPS RUN X
S YS 2 COMPS RUN X
SYS 1 AR TIMER
SYS 2 AR TIMER
SYS 1 AC TIMER
SYS 2 AC TIMER
SYS 1 DSCH LIMITING
SYS 2 DSCH LIMITING
Status Messages

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YORK INTERNATIONAL
FORM 150.62-NM3
Optional Discharge Pressure Trans-
ducers must be installed on the chiller
for this function.
When this message appears, suction pressure limiting
is in effect.
Suction Pressure Transducers are re-
quired for this function.
This message indicates that load limiting is in effect.
The percent of the limiting will be displayed as well.
This limiting could be due to the load limit input be-
ing enabled or the RCC could be sending a load limit
command.
CondensingUnit Only – These messages indicate that
thezonethermostatsforsystem1and system 2 are open.
These messages will only be displayed when the con-
trol mode is programmed for Suction Pressure control.
This message is displayed when the daily schedule has
beenoverriddenandthe unit is inmanualoverridemode.
This will indicate that the Daily Schedule is being ig-
nored and the unit will start-up when demand is present.
This message is displayed when the Chiller Control
Panel has not responded for 5 minutes. This message
will also be displayed on RCC power up.
This message is displayed when the RCC is loading all
history buffer data, current data, and schedule data.
This message is displayed when any data key is pressed
when the current data is not valid. This will occur be-
fore and during the loading of all unit data. It is also
displayed for a few seconds when the user tries to
change the setpoint, schedule or load limiting when the
chiller is in local control mode.
Fault Status Messages
A number of possible fault messages may appear when
the STATUS key is pressed. Whenever a fault message
appears, the safety thresholds on the unit have been
exceeded and the entire unit or a single system will be
shut down and in some cases locked out.
• Unit Faults
The Low Ambient Temp Cutout is a safety shutdown
designed to protect the unit from operating in a low
ambient condition. If the outdoor ambient temperature
falls below the programmable cutout, the chiller will
shut down. Restart can occur when temperature rises
2° above the cutoff.
The Leaving Chilled Liquid Temp Cutout protects the
chiller from an evaporator freeze-up should the chilled
liquid temp drop below the freeze point. The situation
could occur under low flow conditions or if the micro
panel setpoint values are improperly programmed. Any-
time the leaving chilled liquid temperature (water or
glycol) drops below the cutout point, the chiller will
shutdown. Restart can occur when chilled liquid tem-
perature rises 2°F above the cutout.
SYS 1 SUCT LIMITING
SYS 2 SUCT LIMITING
SYS 1 LOAD LIMIT XX%
SYS 2 LOAD LIMIT XX%
MANUAL
OVERR I DE
LOSS OF COMM L INK
TO UNI T PANEL
PLEASE WAIT.........
INITIALIZING REMOTE
UN I T FAULT :
LOW AMB I ENT TEMP
SYS 1 ZONE THERM OFF
SYS 2 ZONE THERM OFF
FUNCT I ON NOT ALLOWED
UNDER COND I T I ONS
UN I T FAULT :
LOW L IQUI D TEMP
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6YORK INTERNATIONAL
The Discharge Pressure Cutout is a software cutout in
the microprocessor and is backed-up by a mechanical
high pressure cutout switch located in the refrigerant
circuit. It assures that the system pressure does not
exceed safe working limits. The system will shutdown
when the programmable cutout is exceeded and will
be allowed to restart when the discharge pressure falls
below the cutout. Optional Discharge transducers
must be installed for this function to operate.
The Suction Pressure Cutout is a software cutout that
protects the chiller from an evaporator freeze-up should
the system attempt to run with a low refrigerant charge
or a restriction in the refrigerant circuit. This function
will not operate unless Suction Pressure Transducers
are installed, which are optional on some models.
This message is displayed when the system has locked
out due to either the compressor motor protector, mo-
tor overload or high pressure cutout opening.
These will be displayed only if a system is locked out
and the lockout fault information is not available, or
the ON button is pressed on the RCC while a system is
locked out on a fault.
The Under Voltage Safety assures that the system is
not operated at voltages where malfunction of the mi-
croprocessor could result in system damage. When the
115VAC to the micropanel drops below a specific level,
a unit fault is initiated to safely shut down the unit.
Restart is allowed after the unit is fully powered again
andtheanti-recycletimershave finished counting down.
The Low Battery Warning can only occur at unit power-
up. When the chiller micropanel is suppled power, the
RTC battery is checked on the chiller microboard. If a
low battery is found, all programmed setpoints, pro-
gram values, options, time, schedule, and history buff-
ers will be lost. These values will all be reset to their
default values which may not be the desired operating
values. Once a faulty battery is detected, the unit will
be prevented from running until the PROGRAM key is
pressed on the chiller keypad. Once PROGRAM is
pressed, the anti-recycle timers will be set to the pro-
grammed anti-recycle time to allow the operator time
to check setpoints, program values, and options.
• System Faults
Following are all the system fault messages. Note that
any message can be displayed for any system. Single
system units will blank the second line of the display.
SYS 1 HIGH DSCH PRES
SYS 2 HIGH DSCH PRES
SYS 1 LOW SUCT PRES
SYS 2 LOW SUCT PRES
SYS 1 MP /HPCO FAULT
SYS 2 MP /HPCO FAULT
SYS 1 LOCKED OUT
SYS 2 LOCKED OUT
LOW BATTERY ! !
CHECK PROG / SETP / T IME
UN I T FAULT :
115VAC UNDER VOLTAGE
Status Messages

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YORK INTERNATIONAL
FORM 150.62-NM3
UNIT DATA
Operating Data Displays
The OPER DATA key gives the user access to many
unit and system operating parameters. Following is a
list of displayed operating data screens in the order that
they are displayed:
LCHLT = Leaving chilled liquid temperature and
RCHLT = Return chilled liquid temperature.
Condensing Unit Only – This display shows the dis-
charge air temperature of the leaving the evaporator.
This display will only be shown when the Control Mode
is programmed for Discharge Air.
Condensing Unit Only – This message shows the suc-
tion line temperature of the respective refrigerant sys-
tem. The temperature sensors for this function are op-
tional on all models.
Outside ambient air temperature.
System suction and discharge pressure.
These parameters are only available
when the optional Discharge Pressure
Transducers and Optional Suction
Transducers (some models) are in-
stalled on the chiller.
System accumulated run times for each system com-
pressor.
Some systems only have two compres-
sors and will only display such.
Unit load and unload timers. Refer to unit manual for
detailed loading and unloading scheme.
The cooling demand indicates the “step” of capacity
control the chiller control panel is controlling at. See
the chiller manual for details.
On two system units, this message indicates which sys-
tem is the lead.
Chiller evaporator pump contacts and evaporator heater
status.
The number of compressors commanded to run for a
particular system.
System run time in days, hours, minutes, seconds for
the current cycle.
System status of liquid line solenoid and hot gas sole-
noid (optional).
LCHLT = XXX. X°F
RCHLT = XXX . X ° F
AMB I ENT A I R TEMP
= XXX . X°F
SYS X SP = XXXX PSIG
DP = XXXX PSIG
SYS X HOURS 1=XXXXX
2=XXXXX 3=XXXXX
DISCHARGE AIR TEMP
=57.4°F
SYSX SUCT ION TEMP
=73.6°F
LOAD T IMER XXX SEC
UNLOAD T IMER XXX SEC
COOL I NG DEMAND
X OF X STEPS
LEAD SYSTEM IS
SYSTEM NUMBER X
EVAP PUMP I S XXX
EVAP HEATER IS XXX
SYS X NUMBER OF
COMPS RUNN I NG X
SYS X RUN T IME
XX- XX-XX-XX D-H-M-S
SYS X LLSV I S XXX
HOT GAS SOL I S XXX
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8YORK INTERNATIONAL
Condenser fan stage for the system.
Standard control:
Stage 1 = one fan forward
Stage 2 = two fans forward
Stage 3 = N/A
Low Ambient (optional)
Stage 1 = one fan reverse
stage 2 = one fan forward
stage 3 = two fans forward
See unit manual for details.
History Data
The HISTORY key gives the user access to many unit
and system operating parameters at the time of a unit
of system safety shutdown. When the HISTORY key
is pressed the following screen is displayed.
The user can use the arrow keys to choose a number
from 1 to 6 and ENTER to view any of the 6 history
buffers. Buffer number 1 is the most recent and buffer
number 6 is the oldest safety shutdown saved. The UP
and DOWN arrows can be used to scroll forwards and
backwards through the history buffers to view unit data,
unit status, and setpoints at the time of shutdown.
Data Printing
The PRINT key is used to initiate either an operating
data print or a history print if the optional printer
is attached to the RS-232 port in the RCC. When the
print key is pressed, the following message will
appear.
When the OPER DATA key is pressed after the PRINT
key, an operating data printout is initiated and the fol-
lowing message will be displayed for a few
seconds.
When the HISTORY key is pressed after the PRINT
key, a history printout is initiated and the following
message will be displayed for a few seconds.
If the PRINT key is pressed while a print is currently
being performed, the following message is displayed
for a few seconds and then unit status is displayed.
Sample Printout:
DISPLAYSAFETYSHUT-
DOWN NO . X ( 1 TO 6 )
PRESS OPER DATA OR
HISTORY KEY TO PRINT
PR I NT I NG
OPERAT I NG DATA
PRI NTER
CURRENTLY ACT I VE
YORK INTERNATIONAL CORPORATION
MILLENNIUM LIQUID CHILLER
UNIT STATUS
2:04PM 18 JUN 98
SYS 1 NO COOLING LOAD
SYS 2 COMPRESSORS RUNNING 2
OPTIONS
CHILLED LIQUID WATER
AMBIENT CONTROL STANDARD
LOCAL/REMOTE MODE REMOTE
CONTROL MODE LEAVING LIQUID
LEAD/LAG CONTROL AUTOMATIC
FAN CONTROL AMB & DSCH PRESS
UNIT DATA
RETURN LIQUID TEMP 58.2 DEGF
LEAVING LIQUID TEMP 53.0 DEGF
COOLING RANGE 42.0 +/- 2.0 DEGF
AMBIENT AIR TEMP 74.8 DEGF
LEAD SYSTEM SYS 2
EVAPORATOR PUMP ON
EVAPORATOR HEATER OFF
UNIT SOFTWARE VER C.MMC.01.00
RCC SOFTWARE VER C.MMC.02.00
SYSTEM 1 DATA
COMPRESSORS STATUS OFF
RUN TIME 0- 0- 0- 0 D-H-M-S
SUCTION PRESSURE 66 PSIG
DISCHARGE PRESSURE 219 PSIG
LIQUID LINE SOLENOID OFF
HOT GAS BYPASS VALVE OFF
CONDENSER FAN STAGES OFF
SYSTEM 2 DATA
COMPRESSORS STATUS 2
RUN TIME 0- 0- 1-46 D-H-M-S
SUCTION PRESSURE 51 PSIG
DISCHARGE PRESSURE 157 PSIG
LIQUID LINE SOLENOID ON
CONDENSER FAN STAGES 3
DAILY SCHEDULE
S M T W T F S *=HOLIDAY
MON START=00:00AM STOP=00:00AM
TUE START=00:00AM STOP=00:00AM
WED START=00:00AM STOP=00:00AM
THU START=00:00AM STOP=00:00AM
FRI START=00:00AM STOP=00:00AM
SAT START=00:00AM STOP=00:00AM
HOL START=00:00AM STOP=00:00AM
SYS X FAN STAGE XXX
PRI NT I NG
HISTORY DATA
Unit Data

9
YORK INTERNATIONAL
FORM 150.62-NM3
OPTIONAL PRINTER INSTALLATION
The optional printer combined with the RCC option
allows the operator to obtain a remote printout through
the RCC device. The printer to RCC distance should
be limited to 25 ft.
YORK recommends the field tested WEIGH-TRONIX
model 1220 printer (or former IMP 24). This is a com-
pact low cost printer that is ideal for service work and
data logging.
The WEIGH-TRONIX printer can be obtained by con-
tacting WEIGH-TRONIX for purchase information at:
WEIGH-TRONIX
2320 Airport Blvd.
Santa Rosa, CA 95402
Phone: [phone] or 1-707-527-5555
(International Orders Only)
The part number for the printer that is packaged spe-
cifically for YORK is P/N 950915576. The cable to
connect the printer can either be locally assembled from
FIG. 1 – PRINTER TO MICROBOARD ELECTRICAL CONNECTIONS
LD02722
the parts listed, or ordered directly from WEIGH-
TRONIX under part number 287-040018.
PARTS
The following parts are required:
1. WEIGH - TRONIX model 1220 printer.
2. 2.25" (5.7cm) wide desk top calculator paper.
3. 25 ft. (7.62m) maximum length of Twisted
Pair Shielded Cable (minimum 3 conductor), #18
AWG stranded, 300V minimum insulation.
4. One 25 pin Cannon connector and shell.
Connector: Cannon P/N DB-25P or equivalent.
Shell: Cannon P/N DB-C2-J9.
Assembly and Wiring
All components should be assembled and wired as
shown in Figure 1. Strip the outside insulation back
several inches and individual wires about 3/8" (9.5 mm)
to connect the cable at the Microboard. Do not connect
the shield at the printer-end of the cable.
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10 YORK INTERNATIONAL
PROGRAMMABLE VALUES
Cooling Setpoints
Cooling setpoints and ranges can be programmed by
pressing the COOLING SETPOINTS key. For chill-
ers, the cooling mode will be displayed for a few sec-
onds and then the setpoint entry screen will be dis-
played. Depending on whether the unit is a chiller or
condensing unit will determine the cooling modes dis-
played (leaving or return chilled liquid, discharge air
temperature, or suction pressure control). Refer to the
chiller or condensing unit Installation, Operation, and
Maintenance manual for a detailed explanation of these
functions.
The table below contains the allowable ranges for the
cooling setpoints and control ranges. Note that the En-
glish units are exact values while the Metric units are
approximate.
If the chiller is programmed for REMOTE control, the
following setpoints can be changed by pressing the
COOLING SETPOINTS key. The values can be
changed by using the Up Arrow and Down Arrow keys
and then entering the new setpoint by pressing the EN-
TER key. If the chiller control panel is programmed for
LOCAL control, the setpoints cannot be changed from
the RCC and an attempt to do so will result in the fol-
lowing message:
FUNCT I ON NOT ALLOWED
UNDER COND I T I ONS
Following are the messages for the programming of the
setpoint and range for leaving and return chilled liquid
control respectively. These are for chillers only.
Following are the messages for the programming of the
setpoint and range for discharge air temp and suction
pressure control respectively. These are for condens-
ing units only.
SETPOI NT = XXX . X°F
RANGE = + / – X . X ° F
SETPOINT = XXX . X° F
RANGE = +XX . X° F
SETPOI NT = XXX . X°F
RANGE = + / – X . X ° F
SYS 1SP= XXXX PSIG
RANGE = + / - XXX PS I G
SYS 2SP= XXXX PSIG
RANGE = + / - XXX PS I G
TABLE 1 – ALLOWABLE RANGES FOR COOLING SETPOINTS AND CONTROL RANGES
SETPOINT KEY MODE LOW LIMIT HIGH LIMIT DEFAULT
LEAVING CHILLED LIQUID SETPOINT WATER COOLING 40.0°F **70.0°F 40.0°F
4.4°C 21.1°C 6.7°C
GLYCOL COOLING 10.0°F 70.0°F 44.0°F
-12.2°C 21.1°C 6.7°C
LEAVING CHILLED LIQUID —1.5°F 2.5°F 2.0°F
CONTROL RANGE 0.8°C 1.4°C 1.1°C
RETURN CHILLED LIQUID SETPOINT WATER COOLING 40.0°F 70.0°F 44.0°F
4.4°C 21.1°C 6.7°C
GLYCOL COOLING 10.0°F 70.0°F 44.0°F
-12.2°C 21.1°C 6.7°C
RETURN CHILLED LIQUID —4.0°F 20.0°F 10.0°F
CONTROL RANGE 2.2°C 11.1°C 5.6°C
DISCHARGE AIR TEMP SETPOINT —45.0°F 70.0°F 55.0°F
7.2°C 21.1°C 12.7°C
DISCHARGE AIR TEMP CONTROL RANGE —3.0°F 10.0°F 5.0°F
1.7°C 5.6°C 2.8°C
SUCTION PRESSURE SETPOINTS —60 PSIG 90 PSIG 70 PSIG
4.14 BARS 6.21 BARS 4.83 BARS
SUCTION PRESSURE CONTROL RANGES —1.5 PSIG 10 BARS 2.5 BARS
0.10 BARS 0.69 BARS 0.17 BARS
Programmable Values

11
YORK INTERNATIONAL
FORM 150.62-NM3
Daily Schedule / Holiday
The Daily Schedule can be programmed to control the
start and stop time of the chiller. To set the schedule,
proceed as follows: press the SET SCHEDULE / HOLI-
DAY key. The display will show the following mes-
sage:
The line under the 0 is the cursor. If the start time is
wrong, it may changed by using the UP and DOWN
arrow keys. Once the correct hour is shown, press the
ENTER key. The cursor will then move to the minute
selection. Once the correct minute is shown, press the
ENTER key. The cursor will then move to the AM/PM
selection. This value may be chosen by the UP and
DOWN arrow keys and entered by pressing ENTER.
This process may be followed until the hour, minutes,
and meridian of both the START and STOP points are
set. Once a schedule is entered, the schedule for the
next day will appear. The start and stop time of each
day may beprogrammed differently. If you want to view
the schedule without making a change, simply press
the SET SCHEDULE / HOLIDAY key until the day
you wish to view appears.
If the time is ever changed for Mon-
day, all the other days will change to
thenew Mondayschedule.This means
ifthe Mondaytimes are notapplicable
for the whole week then the excep-
tional days would need to be repro-
grammed to the desired schedule.
After SUN (Sunday) schedule appears on the display a
subsequent press of the SET SCHEDULE / HOLIDAY
key will display the Holiday schedule. This is a two
part display. The first reads:
The times may be set using the same procedure as de-
scribed above for the days of the week. Pressing the
SET SCHEDULE / HOLIDAY key a second time, the
display will read:
The line below the empty space next to the S is the
cursor and will move to the next empty space when the
ENTER/ADV key is pressed. To set the Holiday, the
cursor is moved to the space following the day of the
week of the holiday and the UP arrow key is pressed.
An * will appear in the space signifying that day as a
holiday. The * can be removed by pressing the DOWN
arrow key.
The Holiday schedule must be programmed weekly –
once the holiday schedule runs, it will revert to the nor-
mal daily schedule.
Load Limiting
The LOAD LIMIT key is used to load limit the unit.
This function modifies Load Limit setpoint found on
theunit.Themessage displayed when theLOADLIMIT
key is pressed follows.
Load Limiting can be programmed from 0 to 2 using
the arrow keys. The unit will operate on either this load
limit setpoint or its local value, whichever is lower.
Load Limit 0 = no load limit
Load Limit 1 = 50% load limit - 2/4 compressor units.
Load Limit 1 = 66% load limit - 3/6 compressor units.
Load Limit 2 = 33 % - 3/6 compressor units only.
Refer to chiller unit manual for a detailed explanation
on Load Limiting.
Remote Unit Run
• ON Key
When the ON key is pressed, the unit will be given a
remote run permissive from the RCC. Assuming all
other run permissives are met, the unit will be allowed
to run. The following message will be displayed for a
few seconds after the ON key is pressed. The chiller
must be programmed for Remote mode to use this func-
tion.
When the OFF key is pressed, the unit remote run per-
missive from the RCC will be turned off. The unit will
not be allowed to run in this state. The following mes-
sage will be displayed for a few seconds after the OFF
key is pressed.
MON START = 0 6 : 0 0 AM
STOP = 10 : 00 PM
HOL START = 0 6 : 0 0 AM
STOP = 10 : 00 PM
S_ M T W T F S
HOL I DAY NOTED BY *
LOAD L IMI T STAGE
X
REMOTE UN I T RUN
IS ON
REMOTE UN I T RUN
IS OFF
4

12 YORK INTERNATIONAL
LD05175
FIELD WIRING
FIG. 2 –FIELD WIRING
Field Wiring

13
YORK INTERNATIONAL
FORM 150.62-NM3
LD05175
FIELD WIRING
FIG. 3 –FIELD WIRING
5

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YORK INTERNATIONAL
FORM 150.62-NM3
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