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TM
MILLENNIUM
CENTRIFUGAL LIQUID CHILLERS
Supersedes: Nothing Form 160.49-O2 (1296)
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
27385A
WWWARNING ARNING ARNING
WWARNING ARNING
SYSTEM CONTAINS REFRIGERANT UNDER PRESSURE.
SERIOUS
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TTABLE OF CONTENTS ABLE OF CONTENTS TTTABLE OF CONTENTS ABLE OF CONTENTS ABLE 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 .................
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FORM 160.49-O2 NOMENCLATURE R-22 UNITS YK N2 N1 H1 – CX C DESIGN LEVEL (C) MOTOR CODE: { 60 HZ 50 HZ CH CX 5CE 5CT POWER SUPPLY CJ CY 5CF 5CU – for 60 HZ CK CZ 5CG 5CV 5 for 50 HZ CL CA 5CH 5CW CM CB 5CI 5CX COMPRESSOR CODE CN DA 5CJ 5DA G4, H0, H1, H2, J1, J2 CP DB 5CK 5DB CR DC 5CL 5DC CS DD 5CM 5DD CONDENSER CODE CT DE 5CN 5DE M3, M4, N3, N4, P3, P4, Q3, Q4, R3, R4, S3, S4 CU DF 5CO 5OF CV DH 5CP 5OG COOLER CODE CW DJ 5CQ 5OH M3, M4, N3, N4, P3, P4, P5, P6, Q3, Q4, Q5
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SECTION 1 DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION COMPRESSOR CONTROL CENTER MOTOR PRE-ROTATION VANE DISCHARGE LINE ACTUATOR 27385A COOLER 27382A OIL RESERVOIR/ CONDENSER PUMP FIG. 1 – MODEL YK MILLENNIUM CHILLER SYSTEM OPERATION DESCRIPTION (See Fig. 2) In operation, a liquid (water or brine to be chilled) flows through the cooler, where boiling refrigerant absorbs The YORK Model YK Millennium Chiller is commonly heat from the water. The chilled liquid is then piped to applied to l
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FORM 160.49-O2 design conditions. However, 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 en- trance to the compressor impeller, compensate for varia- tion in load (See Fig. 2
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SECTION 2 MICROCOMPUTER CONTROL CENTER 26879A LD00953 FIG. 3 – MICROCOMPUTER CONTROL 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 accor- dance with the instructions manual, may cause interfere
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FORM 160.49-O2 INTRODUCTION The YORK MicroComputer Control Center is a micro- The system setpoints (see Fig. 3) are operator entered processor based control system for R-22 or R134a cen- on the front control center Setpoints keypad. These trifugal chillers. It controls the leaving chilled water tem- setpoints can also be displayed on the 40 character al- perature via pre-rotation vane control and has the ability phanumeric display. The system setpoints are: to limit motor current via control of
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CONTROL CENTER The Control Center front panel layout consists of five SERVICE – Included in this group of keys are those func- key groups, one switch and a 1 line by 40 character al- tions that are only relevant to servicing the chiller. phanumeric vacuum fluorescent display: (see Fig. 3.) Typically, these keys would not be used for daily chiller operation. CHARACTERISTIC DISPLAY – The alphanumeric vacuum fluorescent display is located to the right of the ACCESS CODE – Permits operator to acces
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FORM 160.49-O2 ______ PSID = (HOP – LP) – OFFSET PRESSURE DISPLAY READS OFFSET PRESSURE: Pressure differential between CONDENSER PRESS. = < 6.8 PSIG, or > 300 PSIG XX.X PSIG the HOP transducer and LOP transducer outputs dur- EVAPORATOR PRESS. = < 50 PSIG, or > 125 PSIG XX.X PSIG ing a 3 second period beginning 10 seconds after the EVAP. PRESS. (BRINE) = < 25 PSIG, or > 100 PSIG XX.X PSIG start of “START SEQUENCE INITIATED”. During this HOP TRANSDUCER = < 59.1 PSIG, or > 314.9 PS
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Computer Control Center”, page 14. However, the purpose of the OPERATING HOURS key To Display CONDENSER LIQUID TEMPERATURES is to display the total accumulated chiller run (Field Installed Option Package): time. Therefore, the operating hours should not be arbitrarily reset. Use CONDENSER LIQUID TEMPS display key as described above to produce the following alphanu- SYSTEM SETPOINTS meric display message: COND LEAVING = XXX.X°F; RETURN = XXX.X°F The system setpoints may be programmed
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FORM 160.49-O2 terms of minutes (to a maximum of 255). If not pro- For additional information on remote LCWT reset, refer grammed, the default value is 100% FLA for 00 min- to Form 160.49-PW13. utes. (See “Programming Systems Setpoints”, page 16.) Thus, no pull down demand limit is imposed following NOTE: If an Energy Management System is interfaced system start, and the % current limit setpoint is used. to the Control Center for the purpose of remote LCWT setpoint reset, then the operator pro-
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DISPLAYING SYSTEM SETPOINTS If chiller is equipped with a YORK Solid State Starter, the message is: The currently programmed Setpoint values can be CURRENT LIMIT = XXX % FLA; *MTR CUR = 000 FLA viewed at any time (see page 22) in SERVICE, LOCAL or REMOTE operating mode as follows: NOTE: On Solid State Starter applications, this value is programmed at the YORK factory. A special ac- • Press and release the appropriate Setpoint key – the cess code is required. message will be displaye
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FORM 160.49-O2 TUE START = 05:00 AM STOP = 07:00 PM WED START = 05:00 AM STOP = 07:00 PM To Display UNDERVOLTAGE setpoints: THU START = 05:00 AM STOP = 07:00 PM (Solid State Starter Applications Only) FRI START = 05:00 AM STOP = 07:00 PM Press SSS MOTOR CURRENT/VOLTS key in PRO- SAT START = 05:00 AM STOP = 01:00 PM GRAM mode to display the selected voltage range. One of the following messages will be displayed. HOL START = 00:00 AM STOP
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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 follows to enter system setpoints. (Refer to Fig. 5.) 1. Press ACCESS CODE key. 2. ENTER VALID ACCESS CODE _ _ _ _ is displayed. 3. Using ENTRY keys, enter 9 6 7 5. 4. As each digit is entered, the characters Y O R K are displayed. NOTE: If digits other than 9 6 7 5 are entered, LD00954 YO R K is stil
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FORM 160.49-O2 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 avail- able to an Energy Management System. If any En- ergy Management System is applied, this value must be entered into the Energy Management System. Refer to previous explanation or REMOTE/RESET TEMP RANGE, page 11. 2. Use ENTR
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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 dis- played: SETPOINT = XXX MIN @ XXX % FLA, XXX MIN LEFT 2. Use Entry keys to enter desired values. For expla- nation, see PULL DOWN DEMAND, page 12. Note that “XX min left” is not an operator entered value. 3. Press and release ENTER key. PROGRAM MODE, SELECT SETPOINT message is displayed. LD00957 FIG. 8 – KEYPAD – PROGRAMMING “PULL DO
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FORM 160.49-O2 To Enter DAILY SCHEDULE Setpoint: 6. Use the ADVANCE DAY / SCROLL key with proce- (Refer to Fig. 10.) dure in Step 2. To enter start and stop times for remainder of the week plus a holiday schedule if 1. Press and release DAILY SCHEDULE setpoint key. required. The following prompt message is displayed: 7. Press the ENTER key. SUN START = XX:XX AM, STOP = XX:XX AM PROGRAM MODE, SELECT SETPOINT is displayed. 2. If the displayed start and stop time is not the desir
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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 displayed: S_ M_ T_ W_ T_ F_ S_ HOLIDAY NOTED BY r 2. Press and release ADVANCE DAY/SCROLL key to move cursor to the day that you 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 next to each of the days that you wish to designate a holiday, press ENTER key PRO
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FORM 160.49-O2 SERVICE KEYS LD00963 FIG. 13 – KEYPAD – SERVICE KEYS LOCATION The Service keys are provided for the service techni- running, SYSTEM RUN – VANES HOLDING is displayed. cian’s use when performing routine maintenance or when If chiller is not running, troubleshooting the system. The WARNING RESET and SYS READY TO START – VANES HOLDING is displayed. The PRE-ROTATION VANES keys are enabled in SERVICE vanes will remain stationary until the OPEN, HOLD, or mode only. T
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OTHER SERVICE KEYS procedure to select manual refrigerant level control is in Service manual, Form 160.49-M3 and should be per- WARNING RESET – Press and release this key to re- formed only by a qualified service technician. set any “WARNING” or “STATUS” message that can be reset with this key, unless the condition still exists. To reset any cycling or warning message, place the Con- NO. 2 trol Center in SERVICE mode and press WARNING PULLDN LEVEL = XXX%; SETP = XXX%; ACTUAL = XX
