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YORK INTERNATIONAL

UNIT CONTROLS AND OPERATION

YORK MICROCOMPUTER CONTROL CENTER

26572A

FIG. 21

MICROCOMPUTER CONTROL CENTER

INTRODUCTION

The YORK MicroComputer Control Center is a micro-

processor based control system capable of multi-cir-

cuit control to maintain chilled liquid temperature. The

chiller system is controlled by two control / power pan-

els in a Master / Slave configuration. The Master is rec-

ognized by the attached operator display and keypad

which provides control from a single operator location.

A 40 character display (2 lines of 20 characters) allows

the operator to display system operating parameters

as well as access programmed information already in

memory. On the Master Control Panel, a keypad for

programming and accessing setpoints, pressures, tem-

peratures, motor current, cut-outs, daily schedule, op-

tions, and fault information is provided. No Control Panel

is present on the Slave Panel.

A master ON / OFF switch is available to activate or

de-activate the chiller system. Separate system (SYS)

switches for each refrigerant system (up to 4) are pro-

vided on each Microprocessor Board.

Remote cycling, unloading, and chilled water tempera-

ture reset can be accomplished by used supplied dry

contacts.

Compressor starting / stopping and loading / unloading

decisions are performed by the Microprocessor to main-

tain leaving water temperature. These decisions are a

function of temperature deviation from setpoint and rate

of change of temperature.

MICROPROCESSOR BOARD

The Microprocessor Boards are the controller and de-

cision makers in the control panels. System inputs from

pressure transducers, temperature sensors, and C.T.s

are connected directly to the Microprocessor Board. The

Microprocessor Board circuitry multiplexes these ana-

log inputs, digitizes them, and constantly scans them to

keep a constant watch on the chiller operating condi-

tions. From this information, the Microprocessor then

issues commands to the Relay Output Board to control

contactors, solenoids, etc. for water temperature con-

trol and to react to safety conditions.

Two Microprocessor Boards, one acting as a master

and one as a slave controller are present in the chiller.

Control and programming for the entire chiller is pro-

vided by the Master Microprocessor Board. The mas-

ter also has direct control of compressor 1 and 2. The

Slave Microprocessor Board is responsible for direct

control of compressor 3 and 4 as dictated by the

Masters requirements. Communications and informa-

tion transmission between the two micros is accom-

plished by a 2 wire RS-485 communications link.

Keypad commands are acted upon by the micro to

change setpoints, cut-outs, scheduling, operating re-

quirements, and to provide displays.

Содержание YDAJ87KU6

Страница 1: ...NM2 196 60 HZ MODELS YDAJ87KU6 YDAJ88MU6 YDAJ99MW6 50 HZ MODELS YDAJ87HU7 YDAJ97KU7 YDAJ98MU7 YDAJ99MU7 YDAJ99MW9 STYLE A 370 450 TONS 00022TG With EPROM s 031 01096 009 031 01300 002 Standard Brine M...

Страница 2: ...power and control wiring They are designed primarily for central station air conditioning applications with normal instal lations being on roof tops or at ground level beside the building The chiller...

Страница 3: ...m 2 or 4 Compressor Code 40 380 3 60 7 8 9 See PHYSICAL DATA 46 460 3 60 50 380 415 3 50 Cooler Code 58 575 3 60 H K M 64 346 3 50 Fan Code 6 7 8 9 Condenser Code U W Compressor Series Compressor Styl...

Страница 4: ...YORK INTERNATIONAL 4 FIG 1 UNIT COMPONENTS Typical on each of the two modules 00023TG 00024TG...

Страница 5: ...FORM 150 75 NM2 5 YORK INTERNATIONAL FIG 1 UNIT COMPONENTS Cont d LD01910 00025TG...

Страница 6: ...TORPROTECTOR MP DISCHARGE STOP VALVE SUCTIONPRESSURE CONNECTION CAPACITY CONTROL SOLENOIDS RAINTIGHT TERMINAL BOX SUCTION STOP VALVE SIGHT GLASSES 2 OIL CHARGING VALVE OIL PRESSURE ACCESS CONNECTION C...

Страница 7: ...ne temperatures down to 20 F by resetting standard control 2 Operation below 25 F requires the Optional Low Ambient kit 3 Operation above 115 F requires Optional High Ambient kit 4 The evaporator is p...

Страница 8: ...Drive 16 16 16 16 16 HP KW Each 1140 RPM 60 HZ 3 2 4 3 2 4 3 2 4 3 2 4 950 RPM 50 HZ 3 2 2 3 2 2 3 2 2 3 2 2 3 2 2 CFM Total 60 HZ 248 000 248 000 248 000 50 HZ 238 400 238 400 238 400 238 400 238 400...

Страница 9: ...are expected additional unit height must be provided to insure full air flow 2 Cooler liquid connection sizes inlet and outlet 8 victaulic for the YDAJ87KU6 YDAJ99MW9 3 Dimensions are in inches Drawin...

Страница 10: ...BKR WIRE RANGE MCA1 ELEMENT DISC SW CKT BKR WIRE RANGE CODE FUSESIZE MIN SIZE4 HACR TYPE5 CU ONLY 6 FUSESIZE MIN SIZE4 HACR TYPE5 CU ONLY 6 MIN2 MAX3 MIN2 MAX3 J87HU7 50 237 250 400 400 400 1 2 4 250M...

Страница 11: ...CM or 2 wires up to 250MCM Actual wire size and number of wires per phase must be determined based on ampacity and job requirements using N E C wire sizing information The above recommendations are ba...

Страница 12: ...ins See Fig 4 INSPECTION Immediately upon receiving the unit it should be in spected for possible damage which may have occurred during transit If damage is evident it should be noted on the carrier s...

Страница 13: ...Control Panels One of two installation procedures will be required depend ing upon when the chiller was manufactured Please read the note below before proceeding NOTES In the fall winter of 1995 a de...

Страница 14: ...that the shield jumper and 180 ohm resistor are installed in the Slave Panel LTP board as shown in Fig 8 MIXED WATER TEMP SENSOR INSTALLATION A Mixed Leaving Water Temperature Sensor MUST be installed...

Страница 15: ...SYS 1 2 PRESSURES and SYS 3 4 PRES SURES labels must be installed to indicate dual pur pose keys SYS 1 2 PRESSURES label should be applied over the SYS 1 PRESSURES label and SYS 3 4 PRESSURES should...

Страница 16: ...TOR AL CU AL CU AL CU AL CU AL CU AL CU AL CU AL CU YDAJ87KU6 1954 2261 1995 2301 2013 2319 2287 2594 1956 2262 2141 2447 2159 2465 2236 2543 VMC CP 2 31 CP 2 32 CP 2 31 CP 2 32 CP 2 31 CP 2 32 CP 2 3...

Страница 17: ...ission of water pump vibration This is optional and the necessary components must be obtained in the field Drain connections should be provided at all low points to permite complete drainage of liquid...

Страница 18: ...ust the flow switch paddle to the size of pipe in which it is to be installed See manufactuer s instructions furnished with switch The switches are to be wired to terminals in the respective control p...

Страница 19: ...e made as shown on the WIRING DIAGRAM If the Dual Point Wiring Option Fig 14 is installed tow power feeds are required A single feed to the Master Module and a single feed to the Slave Module This dif...

Страница 20: ...t be run in the same conduit with any line voltage wiring 4 To cycle unit on and off automatically with contact shown install a cycling device in series with the flow switch FLSW See Note 3 for contac...

Страница 21: ...pump starters wired through motor contactor auxiliary contacts must be suppressed with YORK P N 031 00808 000 sup pressor across the relay contact coil which acti vates the contacts Any contacts conne...

Страница 22: ...YORK INTERNATIONAL 22 MASTER MODULE WIRING DIAGRAM CONNECTION DIAGRAM MASTER MODULE CONDENSER FANS COOLER COMPRESSORS SYSTEM NO 1 AND NO 2 FIG 16 MASTER MODULE SYSTEM WIRING LD01931 LD01930 LD01929...

Страница 23: ...FORM 150 75 NM2 23 YORK INTERNATIONAL MASTER MODULE WIRING DIAGRAM FIG 16 MASTER MODULE SYSTEM WIRING Cont d LD01932...

Страница 24: ...YORK INTERNATIONAL 24 MASTER MODULE WIRING DIAGRAM LD01933 FIG 17 MASTER MODULE CONNECTION DIAGRAM...

Страница 25: ...FORM 150 75 NM2 25 YORK INTERNATIONAL MASTER MODULE WIRING DIAGRAM LD01934 FIG 17 MASTER MODULE CONNECTION DIAGRAM Cont d...

Страница 26: ...suitable for switching 24VDC Gold contacts recommended Wiring shall not be run in the same conduit with any line voltage wiring 4 To cycle unit on and off automatically with contact shown install a c...

Страница 27: ...p starters wired through motor contactor auxiliary contacts must be suppressed with YORK P N 031 00808 000 sup pressor across the relay contactor coil which acti vates the contacts Any contacts connec...

Страница 28: ...YORK INTERNATIONAL 28 SLAVE MODULE WIRING DIAGRAM CONNECTION DIAGRAM SLAVE MODULE CONDENSER FANS COOLER COMPRESSORS SYSTEM NO 1 AND NO 2 FIG 19 SLAVE MODULE SYSTEM WIRING LD01937 LD01938 LD01939...

Страница 29: ...FORM 150 75 NM2 29 YORK INTERNATIONAL SLAVE MODULE WIRING DIAGRAM LD01940 FIG 19 SLAVE MODULE SYSTEM WIRING Cont d...

Страница 30: ...YORK INTERNATIONAL 30 SLAVE MODULE WIRING DIAGRAM FIG 20 SLAVE MODULE CONNECTION DIAGRAM LD01941...

Страница 31: ...FORM 150 75 NM2 31 YORK INTERNATIONAL SLAVE MODULE WIRING DIAGRAM FIG 20 SLAVE MODULE CONNECTION DIAGRAM Cont d LD01942...

Страница 32: ...loading unloading decisions are performed by the Microprocessor to main tain leaving water temperature These decisions are a function of temperature deviation from setpoint and rate of change of temp...

Страница 33: ...h the Master and Slave Panel CURRENT TRANSFORMER C T A C T on the 3f power wiring of each motor sends AC signals proportional to motor current to Power Supply Board which recitifies and filters the si...

Страница 34: ...OARD MICROPROCESSOR BOARD UNITON OFF SWITCH 2TTRANSFORMER RELAY OUTPUT BOARD 1 TB3 CONNECTIONS FOR FLOW SWITCH AUXILIARY CYCLING LEAD LAG SELECTOR AND EMS BAS CONTROLS LOCATION OF OPTIONAL RELAY OUTPU...

Страница 35: ...nding message will be displayed for the Slave Module or the other system NOTE The AMBIENT TEMP OPTIONS and WATER TEMPERATURE keys will not display a sec ond set of data Display Messages may show chara...

Страница 36: ...yed The counters for an individual system count to a total of 99 999 hours before rollover Accumulated starts on each compressor are also displayed A total of 99 999 starts can be logged on a system b...

Страница 37: ...itions in the order they appear Two possible messages may appear for each of the eight messages depending on the Dip Switch position A detailed explanation of the meaning of each mes sage and a guide...

Страница 38: ...EPROM LOCATION 26001A DIMPLEATTOP MASTER EPROM SLAVE EPROM RTC S1 031 01096 009 031 01300 002 VER 0 0 TOPVIEW TOP SIDE LD01943 LD01944 SIDEVIEW OPEN POSITION LEFT SIDE OF SWITCH IS PUSHED DOWN CLOSED...

Страница 39: ...ill be from leaving water temperature This MUST be selected SWITCH 5 OPEN Display messages will show units of measure in En glish units F PSI etc CLOSED Display messages will show units of measure in...

Страница 40: ...is mode maximum chiller efficiency will be achieved If the Low Ambient option is installed the fan control will automatically change to pressure control at temperatures below 25 F See page 76 for fan...

Страница 41: ...ages will both be displayed and may be different X s in the sample displays indicate numerical values will appear in actual displays This message informs the operator that the UNIT switch on the Contr...

Страница 42: ...high pres sure cut out will shut the system down causing total loss of cooling When this message appears discharge pres sure has exceeded the user programmable threshold and the micro is unloading the...

Страница 43: ...L E R F A U L T L O W A M B I E N T T E M P S Y S 1 H I G H D S C H C H I L L E R F A U L T L O W W A T E R T E M P S Y S 2 H I G H D S C H C H I L L E R F A U L T H I G H A M B I E N T T E M P S Y S...

Страница 44: ...ta after any one of the following keys is pressed PROGRAM SET SCHEDULE HOLIDAY OPER DATA HISTORY Cancel Key The CANCEL key allows the user to change errors in the data being programmed into memory Whe...

Страница 45: ...HARGE CUT OUT The DISCHARGE CUT OUT is a microprocessor back up for the mechanical high pressure cut out located in each refrigerant circuit Typically chillers with air cooled condensers should have t...

Страница 46: ...the high ambient cut out point If the ambient rises above this point the chiller will shut down Restart can occur when temperature drops below the cut out This only applies to outdoor air cooled chil...

Страница 47: ...eating is a result of inrush current when the motor is started This heat must be dissipated be fore another start takes place or motor damage may result The anti recycle timer assures the motor has su...

Страница 48: ...e RATE SENSITIVITY establishes the rate of change of return or leaving water temperature where the micro will over ride the normal 30 150 seconds per stage load ing rate which is based on error betwee...

Страница 49: ...will be dis played when the SET TIME key is pressed To program the day time and date first press the AD VANCE DAY key until the appropriate day of the week is displayed The day will advance each time...

Страница 50: ...view times programmed use the ADVANCE DAY KEY not the ENTER KEY This will assure that after viewing MONDAY that the ENTER KEY is not pressed changing times programmed for the rest of the week If the...

Страница 51: ...ay will tell the user whether LEAVING WATER CONTROL is programmed The chiller is designed to provide a stable desired mixed leaving water temperature as required by the user and is suitable for all ty...

Страница 52: ...E M P C O N T R O L If this message is incorrect see the CHILLED LIQUID CONTROL Section Page 51 for instructions to repro gram the Microprocessor Dip Switch S1 Switch 4 The display will then scroll t...

Страница 53: ...ion Typically 2 F above the Low Limit Water Temperature is appro priate The micro will accept a value 1 5 F above the LWT for this value 2 F above the LWT is the default value Key in the upper limit o...

Страница 54: ...rise where the chiller does not load and pull temperature down select 0 1 F To program the RATE CONTROL TEMP first press the PROGRAM key Repetitively press the ENTER key un til the display below appea...

Страница 55: ...ations 5 0 F min is suggested If unsure of a RATE SENSITIVITY selection use 5 0 F min To program the RATE SENSITIVITY first press the PROGRAM key Repetitively press the ENTER key un til the display be...

Страница 56: ...LAG COMP 3 STEPS_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 19 SLAVE LEAD COMP 3 STEPS LAG COMP 2 STEPS_ _ _ SLAVE LEAD COMP 3 STEPS LAG COMP 2 STEPS 18 SLAVE LEAD COMP 2...

Страница 57: ...micro begins monitoring motor current after 3 sec onds of operation If motor current is exceeding 120 FLA at the 3 second point the compressor will shut down After 4 seconds of operation motor current...

Страница 58: ...tor Three internal temperature sensors are built into the motor stator These sensors are wired into the motor protector module located inside the Motor terminal box As the motor windings heat and cool...

Страница 59: ...ture Safety The High Ambient Temperature Safety assures that the chiller does not run in ambients above 130 F where po tential malfunction of system mechanical and electrical components may result Whe...

Страница 60: ...e of tripping the relief valve due to a very high rate of rise in pressure resulting from a controls problem which would cause condenser water flow to be interrupted In this case the pressure rise is...

Страница 61: ...ard In some cases depending upon tim ing a delay will be noted before the start of the print out These delays should be no cause for concern REMOTE PRINT OUT Oper Data The OPER DATA key allows the ope...

Страница 62: ...ATIONAL CORPORATION RECIPROCATING WATER CHILLERS SYSTEMSTATUS 5 24AM 1 02 95 SYS1 COMPRESSORRUNNING SYS2 COMPRESSORRUNNING SYS3 COMPRESSORRUNNING SYS4 ANTI RECYCYLE TIMER 119 SEC RETURN WATER TEMP 1 8...

Страница 63: ...117 PSID LIQUID LINE SOLENOID ON RUN PERMISSIVE ON STAGES OF LOADING 4 FORWARD FANS 2 REVERSE FANS OFF HOT GAS BYPASS VALVE OFF SYSTEM 2 DATA COMPRESSOR STATUS ON MOTOR AMPS 65 FLA SUCTION PRESSURE 6...

Страница 64: ...d to be meaningful This indication of loading may be different from the actualy loading due to loading unloading timers that are not satisfied and preventing any action or actual mixed leaving water t...

Страница 65: ...lenoid is ON or OFF The micro will activate the Hot Gas signal regardless of whether or not this option is installed OFF SYS 2 Liquid Line Solenoid De energized Closed ON SYS 2 Liquid Line Solenoid En...

Страница 66: ...for all available mes sages This message informs the operator of the time and date of the fault This message informs the operator of the nature of the fault which occurred if it is on the MASTER Modul...

Страница 67: ...ime of the fault This message indicates the Leaving Water Tempera ture from the MASTER Module at the time of the fault This message indicates the Leaving Water Tempera ture from the SLAVE Module at th...

Страница 68: ...ressure Read out is installed This display shows the oil pressure of SYS 1 at the time of the fault This display informs the operator whether SYS 1 liquid line solenoid was energized ON or de energize...

Страница 69: ...at the time of the fault This display indicates the number of fans on SYS 2 which were running forward at the time of the fault This message indicates the number of fans on SYS 2 which were running in...

Страница 70: ...ge indicates whether Compressor 4 was ON or OFF at the time of the fault This message indicates SYS 4 motor current at the time of the fault This display shows the suction pressure of SYS 4 at the tim...

Страница 71: ...TUS display indicating the condition will be displayed indicating that the system does not have a Run Permis sive signal A sample of this message follows NOTE This message will not appear if Anti recy...

Страница 72: ...ssignment is made whenever both com pressors shut down The respective micro will assign the lead to one of the two compressors it directly con trols with the shortest anti recycle time This will tend...

Страница 73: ...ctive and the micro cannot keep track of time although all other functions will op erate normally This could result in the chiller not start ing due to the time frozen on the clock falling outside the...

Страница 74: ...can be converted from PSI to kPa using the formula PSI x 6 89 kPa To obtain panel displays in metric Switch 5 of Dip Switch S1 on BOTH Microprocessor Boards must be placed in the OPEN position Page 39...

Страница 75: ...2 F 56 F This new setpoint can be viewed on the display by pressing the REMOTE RESET TEMP RANGE key To maintain a given offset the micro must be refreshed every 30 seconds 30 minutes with a contact cl...

Страница 76: ...reset 2 Terminal 13 17 contact should always be opened before or simultaneous with those on 13 16 when loading is de sired Otherwise the microprocessor may mistake the closed contacts on 13 17 as a si...

Страница 77: ...andard unloading scheme The loading solenoid on these cylinders is connected to additional electronics for optional extra steps of unloading Cylinders 3 4 have no loading solenoids and are truly perma...

Страница 78: ...l wires metal chips etc 11 Visually inspect wiring power control Must meet NEC and all local codes See Figs 22 and 24 12 Check for proper size fuses in main and control power circuits 13 Verify that f...

Страница 79: ...ill start and a flow of liquid should be noted in the liquid indicator After several min utes of operation the bubbles will disappear and there will be a solid column of liquid when the unit is operat...

Страница 80: ...nning fully loaded Correct superheat setting is 12 15 F The superheat is the difference between the actual tem perature of the returned refrigerant gas entering the compressor and the temperature corr...

Страница 81: ...ead compressor will shut down 6 After 30 seconds of run time the oil pressure of the lead compressor must be a minimum of 20 PSID and the suction pressure must be a minimum of 50 of cut out 7 After 60...

Страница 82: ...oil refer to item 3 under the ANNUAL MAINTENANCE section 3 Check the refrigerant circuit for leaks 4 Operating Pressures and Temperatures Check to see that operating pressures and temperatures are wi...

Страница 83: ...ate for long periods of time J Be sure both discharge and suction stop valves are open before operating the unit 4 Suction and Discharge Valves The condition of the suction and discharge valves should...

Страница 84: ...inductive devices contactor relay coil con nected to these contacts must be suppressed with YORK P N 031 00808 supplied by others Otherwise nuisance faults may occur 0 F LOW AMBIENT OPTION The standa...

Страница 85: ...e sys tem falls below 120 PSIG the ambient temperature exceeds 35 F or discharge pressure of the system rises above 340 PSIG NOTE The corresponding compressor must be on for a minimum of 4 sec before...

Страница 86: ...ressure reaches 360 PSIG and com pressor run time has exceeded 30 seconds fans 1 3 SYS 1 5M 7M fans 5 7 SYS 2 11M 13M fans 9 11 SYS 3 5M 7M or fans 13 15 SYS 4 11M 13M will energize turning the fans i...

Страница 87: ...Gas Operation The hot gas solenoid is energized if the compressor is on its minimum stage of loading and the return water temperature falls below the following point ULCR CR CR 20 Where ULCR Upper Lim...

Страница 88: ...on valve To convert to discharge pressure cycling the micro panel must be programmed for DISCHARGE PRESSURE FAN CONTROL See Page 40 Fan cycling will oper ate as indicated in Table 3 The kit consists o...

Страница 89: ...ed at most stationery stores Shown in Fig 40 and 33 is the WEIGH TRONIX printer and a typical sample print out 23889A YORK INTERNATIONAL CORPORATION RECIPROCATING WATER CHILLERS SYSTEMSTATUS 5 24AM 1...

Страница 90: ...between the printer and the microprocessor board is 25 feet Twisted pair shielded cable is required 3 The printer must be supplied a 115 VAC source 4 The printer may be left connected to the micro pa...

Страница 91: ...ap shot of sys tem operating conditions at the instant that the fault oc curred Additionally the Status indication that is noted in the print out will note the specific fault that occurred Delays may...

Страница 92: ...l holes 3 Install grilles using the proper hardware and supports Refer to Fig 44 and the Parts List for placement of the grilles and the proper hardware required 4 Notch grilles to suit water connecti...

Страница 93: ...lles pan els and the proper hardware required Discard ex isting grilles to attach the louvered panels where necessary FIG 45 LOUVER AND GRILLE INSTALLATION FOR EACH KIT 4 Notch grilles to suit water c...

Страница 94: ...exposed metal parts to prevent rust FIG 47 LOUVER INSTALLATION FOR EACH KIT PART ITEM QTY DESCRIPTION 075 02563 001 1 6 PANEL LOUVERS SIDE BTM 075 02563 002 2 8 PANEL LOUVERS SIDE TOP 075 02563 016 3...

Страница 95: ...l be offset linearly according to the voltage 0 10 VDC ap plied The 0 10 VDC signal should be connected to the and terminals on the TB3 Terminal Block at the right of the microprocessor board Be sure...

Страница 96: ...e supply 2 Defective contactor contacts and contactor 2 Check contacts and contactor 3 Faulty high voltage wiring 3 Check wiring 4 High motor current stored in memory 4 Loose calibration resistors in...

Страница 97: ...em exists LOW AMBIENT TEMP 2 Temperature sensed incorrectly by thermistor 2 Verify actual ambient temperature immediately Cuts out on low ambient at probe with thermometer temperature 3 Check low ambi...

Страница 98: ...pressure programmed unload point or 1 Excessive load Check OPERATING LIMITATIONS Solenoid valve de energizes operating limitations have been exceeded Check programmed unloading point to load compress...

Страница 99: ...FORM 150 75 NM2 99 YORK INTERNATIONAL...

Страница 100: ...4 103 217 4 40 0 104 219 2 40 6 105 221 0 41 1 106 222 8 41 7 107 224 6 42 2 108 226 4 42 8 109 228 2 43 3 110 230 0 43 9 111 231 8 44 4 112 233 6 45 0 113 235 4 45 6 114 237 2 46 1 115 239 0 46 7 116...

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