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FORM 160.52-O1

39

YORK INTERNATIONAL

GENERAL

The YORK Model YK Millennium Centrifugal Liquid

Chiller is completely factory-packaged including cooler,

condenser, compressor, motor, lubrication system, Mi-

croComputer Control Center, and all interconnecting

unit piping and wiring.

The initial charge of refrigerant and oil is supplied for

each unit. Oil is shipped in containers with the chiller.

Refrigerant is shipped to the jobsite in cylinders at the

time of installation.

The services of a YORK factory-trained, field service

representative are included to supervise the final leak

testing, charging and the initial start-up and concurrent

operator instructions.

COMPRESSOR

The compressor is a single-stage centrifugal type pow-

ered by an open-drive electric motor.

The rotor assembly consists of a heat-treated alloy steel

drive shaft and impeller shaft with a cast aluminum,

fully shrouded impeller. The impeller is designed for

balanced thrust and is dynamically balanced and over-

speed tested.

The inserted type journal and thrust bearings are fabri-

cated of aluminum alloy. Single helical gears with

crowned teeth are designed so that more than one tooth

is in contact at all times. Gears are integrally assembled

in the compressor rotor support and are film lubricated.

Each gear is individually mounted in its own journal

and thrust bearings.

The open-drive compressor shaft seal consists of a

spring-loaded, precision carbon ring, high temperature

elastomer “O” ring static seal, and stress-relieved, pre-

cision lapped collars. The seal is oil-flooded at all times

and is pressure-lubricated during operation.

CAPACITY CONTROL

Prerotation vanes (PRV) modulate chiller capacity from

100% to as low as 15% of design for normal air condi-

tioning applications. Operation is by an external, elec-

tric PRV actuator which automatically controls the vane

position to maintain a constant leaving chilled liquid

temperature.

COMPRESSOR LUBRICATION SYSTEM (See Fig. 18)

The chiller lubrication system consists of the oil pump,

oil filter, oil cooler and all interconnecting oil piping and

passages. There are main points within the motor-com-

pressor which must be supplied with forced lubrication

as follows:

1. COMPRESSOR DRIVE SHAFT (Low Speed)

a. Shaft seal.
b. Front and rear journal bearings – one on each

side of driving gear.

c. Low speed thrust bearing (forward and reverse).

2. COMPRESSOR DRIVEN SHAFT (High Speed)

a. Forward and reverse high speed thrust bearing.
b. Two journal bearings.

3. SPEED INCREASING GEARS

a. Meshing surfaces of drive and pinion gear teeth.

To provide the required amount of oil under the neces-

sary pressure to properly lubricate these parts, a mo-

tor driven submersible oil pump is located in a remote

oil sump.

Upon pressing of the 

COMPRESSOR START 

switch

on the Control Center, the oil pump is immediately en-

ergized. After a 50 second pre-lube period, the com-

pressor motor will start. The oil pump will continue to

run during the entire operation of the compressor, and

for 150 seconds during compressor coastdown.

The submerged oil pump takes suction from the sur-

rounding oil and discharges it to the oil cooler where

heat is rejected. The oil flows from the oil cooler to the

oil filter. The oil leaves the filter and flows to the emer-

gency oil reservoir where it is distributed to the com-

pressor bearings. The oil lubricates the compressor

rotating components and is returned to the oil sump.

There is an emergency oil reservoir located at the high-

est point in the lubrication system internally in the com-

pressor. It provides an oil supply to the various bear-

ings and gears in the event of a system shutdown due

to power failure. The reservoir, located on the top of

the compressor, allows the oil to be distributed through

the passages by gravity flow, thus providing necessary

lubrication during the compressor coastdown.

OIL PUMP

For normal operation, the oil pump should operate at

all times during chiller operation. Manual pump opera-

tion may be used to establish stable oil pressure be-

fore starting. When depressed and released, the

MANUAL OIL PUMP 

key will operate the oil pump for

10 minutes and then automatically shut off. To stop the

oil pump sooner, depress the 

MANUAL OIL PUMP 

key

again.

Содержание MILLENNIUM YK

Страница 1: ...ELECTRO MECHANICAL STARTER SOLID STATE STARTER VARIABLE SPEED DRIVE WARNING SYSTEM CONTAINS REFRIGERANT UNDER PRESSURE SERIOUS INJURY COULD RESULT IF PROPER PROCEDURES ARE NOT FOLLOWED WHEN SERVICING...

Страница 2: ...Maintenance 43 SECTION 6 Trouble Shooting 45 SECTION 7 Maintenance 50 SECTION 8 Preventive Maintenance 59 Page REFERENCE INSTRUCTIONS DESCRIPTION FORM NO Solid State Starter Operation Maintenance 160...

Страница 3: ...B DC DD EB EC ED FB FC FD GB GC GD HB HC HD JB JC JD TB TC TD VB VC VD COOLER CODE CB CC CD CE DB DC DD DE FB FC FD GB GC GD GF GH HB HC HF HH JF JG JH TF TG TH VF VH WF WH MODEL MOTOR CODE 60 HZ 50 H...

Страница 4: ...s applied with an electro mechanical starter YORK Solid State Starter optional or Variable Speed Drive optional In operation a liquid water or brine to be chilled flows through the cooler where boilin...

Страница 5: ...r components of a chiller are selected for full load capacities therefore capacity must be controlled to maintain a constant chilled liquid temperature leav ing the cooler Prerotation vanes PRV locate...

Страница 6: ...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 whatever action may be required to correct the inte...

Страница 7: ...EVAPORATOR AND CONDENSER DISCHARGE TEMPERATURE OIL TEMPERATURE HIGH LOW OIL PRESSURE TRANSDUCER PRESSURE SOLID STATE STARTER MOTOR CURRENT VOLTS When Supplied CONDENSER REFRIGERANT LEVEL The system s...

Страница 8: ...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 ope...

Страница 9: ...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 k...

Страница 10: ...mmed 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...

Страница 11: ...ming week are holidays On those designated days the chiller will automatically start and stop via the holi day start and stop times programmed in the DAILY SCHEDULE setpoint It will do this one time o...

Страница 12: ...erator 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 If chiller is equipped with a YO...

Страница 13: ...age REMOTE RESET TEMP RANGE 10 F or REMOTE RESET TEMP RANGE 20 F To Display DATA LOGGER setpoints Refer to YORK Form 160 49 N2 for operation of this key To Display UNDERVOLTAGE setpoints Solid State S...

Страница 14: ...THORIZED is displayed NOTE Unless terminated by pressing the AC CESS CODE key again the operator will have access to the PROGRAM key for 10 minutes When 10 minutes have elapsed access to PROGRAM key w...

Страница 15: ...MODE SELECT SETPOINT message is displayed To Enter CURRENT LIMIT Setpoint Electro Mechanical Starter refer to Fig 7 1 Press and release CURRENT LIMIT setpoint key The following program prompt message...

Страница 16: ...y PROGRAM MODE SELECT SETPOINT message is displayed 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 follo...

Страница 17: ...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 ADVANCE DAY SCROLL key The following prompt message is displayed MON START X...

Страница 18: ...R key PROGRAM MODE SELECT SETPOINT message is displayed To cancel all of the designated holidays perform Step 1 press CANCEL key and then press ENTER key PROGRAM MODE SELECT SETPOINT message is displa...

Страница 19: ...13 KEYPAD SERVICE KEYS LOCATION SERVICE KEYS LD00963 HOLD Press and release this key to hold the pre rotation vanes in their present position If the chiller is running SYSTEM RUN VANES HOLDING is dis...

Страница 20: ...o reset any safety shutdown mes sage press WARNING RESET key in SERVICE mode with the COMPRESSOR switch in the STOP RESET position MANUAL OIL PUMP This key is operational in any mode Press and release...

Страница 21: ...celled or NO 2 ACTUAL LEVEL XXX LEVEL SETP XXX Displays the actual refrigerant level in the condenser and the refrigerant level setpoint programmed by the service technician This message replaces the...

Страница 22: ...MODE IN EFFECT is displayed If the Control Center is in SERVICE mode SERVICE OPERATING MODE IN EFFECT is displayed To change operating mode proceed as follows 1 Press ACCESS CODE key 2 ENTER VALID ACC...

Страница 23: ...lue the vanes will be driven closed not fully closed only far enough to allow the current to decrease to a value less than 104 of the operator programmed XXX FLA cur rent limit For example With the op...

Страница 24: ...rises to 28 PSIG 193 kPa R 134a the vanes will be per mitted to open Low pressure limit feature is not used when program jumper JP3 is cut Brine application SYSTEM RUN HIGH PRESSURE LIMIT IN EFFECT Di...

Страница 25: ...wn The flow switch is checked 25 seconds into Start Sequence Initiated and continuously thereafter MON XX XX AM SYSTEM CYCLING AUTOSTART A remote command computer relay contact or manual switch connec...

Страница 26: ...ut out settings will vary with the brine applica tion To restart the chiller wait until the safety contacts close press the COMPRESSOR switch to the STOP RESET position and then to the START position...

Страница 27: ...arge tem perature has increased to 220 F 104 C The system will be allowed to restart when the temperature has decreased to 219 F 103 C Temperature is sensed by a thermistor RT2 To restart the chiller...

Страница 28: ...r JP4 removed this period is extended to allow for a longer coastdown time EPROM version C 02F T 11 provides a 6 minute coastdown period EPROM version C 02F T 12 or later provides a 10 minute coastdow...

Страница 29: ...T position and then to the START position MON XX XX AM PROX SENSOR SAFETY SHUTDOWN The chiller is shut down because the Proximity Tem perature Sensor has detected that the distance be tween the compre...

Страница 30: ...orientation orientation notch must be UP Refer to Fig 14 MON XX XX AM OPEN DRAIN TEMP THERMOCOUPLE The chiller is shut down because the Proximity Tem perature Sensor thermocouple or high speed drain...

Страница 31: ...not start if the oil is less than 71 F 22 C If not possible the compressor oil should be drained and new oil must be charged into the oil sump See Charging Unit With Oil page 44 2 Oil Pump To check pr...

Страница 32: ...for a 50 sec ond pre run to establish oil flow and adequate lu brication to all bearings gears and rotating sur faces within the compressor The high and low oil pressure transducers OP and the oil te...

Страница 33: ...he Control Center as MON 10 30 AM LOW WATER TEMPERATURE AUTOSTART This occurs when the leaving water temperature falls to 4 F 2 2 C below setpoint or 36 F 2 2 C whichever is higher The LWT is part of...

Страница 34: ...erating condi tions temperatures and pressures recorded at regu lar intervals throughout each 24 hour operating period should be kept An optional status printer is available for this purpose or Fig 16...

Страница 35: ...ondenser saturation temperature based upon condenser pressure sensed by the condenser transducer Press the DISPLAY DATA key This key may be depressed repeatedly after depressing the DISPLAY HOLD key t...

Страница 36: ...Low Evaporator Pressure Low Oil Pressure High Oil Flow High Condenser Pressure Evaporator Transducer or Probe Error High Discharge Temp High Oil Temp Oil Pressure Transducer Starter Malfunction Detect...

Страница 37: ...ng temperatures are encountered while the system is idle carefully drain the cooling water from the cooling tower condenser condenser pump and the chilled water system chilled water pump and coils Ope...

Страница 38: ...COOLER OIL RESERVOIR PUMP 28778A FRONT VIEW SIGHT GLASS REFRIGERANT CHARGING VALVE 28815A COOLER MOTOR ADAPTER MOTOR SUPPORT COVER MICROCOMPUTER CONTROL CENTER SUCTION DUAL RELIEF VALVES VARIABLE SPE...

Страница 39: ...pump oil filter oil cooler and all interconnecting oil piping and passages There are main points within the motor com pressor which must be supplied with forced lubrication as follows 1 COMPRESSOR DRI...

Страница 40: ...40 YORK INTERNATIONAL FIG 18 SCHEMATIC DRAWING YK COMPRESSOR LUBRICATION SYSTEM LD03278...

Страница 41: ...HANGERS Evaporator and condenser shells are fabricated from rolled carbon steel plates with fusion welded seams Heat exchanger tubes are internally enhanced type The evaporator is a shell and tube flo...

Страница 42: ...ared and normal control is resumed OPTIONAL SERVICE ISOLATION VALVES If your chiller is equipped with optional service isola tion valves on the discharge and liquid line these valves must remain open...

Страница 43: ...drator to the compressor sump CHANGING THE DEHYDRATOR To change the dehydrator use the following procedure 1 Shut the stop valves on the condenser gas line oil return line to rotor support and inlet...

Страница 44: ...valve A located on the remote oil reservoir cover plate See Fig 20 Do not tighten the connection at the charging valve until after the air is forced out by pumping a few strokes of the oil pump This f...

Страница 45: ...remote com Automatic Restart Contact connected to Cycling mand computer upon remote the Remote Local relay contact or command cycling input of the manual switch Digital input board MON 10 00 AM Multi...

Страница 46: ...n RS1 LCWT minus satu tor RS1 ration temperature is less than 2 5 F or greater than 25 F Checked every 10 minutes following a 10 min bypass at start up MON 10 00 AM Motor Con CM2 or Solid Reset the de...

Страница 47: ...r Check motor starter Malfunction 15 for 10 swc STOP RESET operation Motor current Detected with Control Cen switch and then value greater than 15 ter not calling for FLA motor to run MON 10 00 AM Pro...

Страница 48: ...n normal with normal discharge temperature Temperature of chilled water too low with Insufficient load for Check prerotation vane motor opera with low motor amperes system capacity tion and setting of...

Страница 49: ...ALLY DECREASES Noted by Observation of Daily Log Sheets Oil pressure noted when pressing OIL Oil filter is dirty Change oil filter PRESSURE display key drops to 70 of oil pressure when compressor was...

Страница 50: ...or can be used to detect any leaks too small to be found by the soap test To test with R 22 proceed as follows 1 With no pressure in the system charge R 22 gas into the system through the charging val...

Страница 51: ...t the vacuum pump leaving the vacuum indicator in place 6 Hold the vacuum obtained in Step 3 in the system for 8 hours the slightest rise in pressure indicates a leak or the presence of moisture or bo...

Страница 52: ...to be tight prior to evacuation then the saturation tem perature recordings should follow a curve similar to the typical saturation curve shown as Fig 22 The temperature of the water in the test tube...

Страница 53: ...urnished in cylinders contain ing either 30 50 125 or 1750 lbs 207 345 862 or 12 066 kg of refrigerant TABLE 4 REFRIGERANT CHARGE CHECKING THE REFRIGERANT CHARGE DURING UNIT SHUTDOWN The refrigerant c...

Страница 54: ...enser or evaporator compressor while making any necessary repairs While the main disconnect switch and compressor motor starter are open meg the motor as follows 1 Using a megohm meter megger meg betw...

Страница 55: ...FORM 160 52 O1 55 YORK INTERNATIONAL FIG 24 MOTOR STATOR TEMPERATURE AND INSULATION RESISTANCES LD00476 TEMPERATURE F MEGOHMS Minimum Insulation Resistance vs Temperature per IEEE Std 43 Open Motors...

Страница 56: ...time accompanied by a steady rise in con densing temperature and noisy operation These symp toms may also be due to foul gas buildup Purging will remove the foul gas revealing the effect of fouling TU...

Страница 57: ...ube heads and the ends of all tubes with water NOTE Do not use carbon tetrachloride for this pur pose since its fumes give the same flame discoloration that the refrigerant does 3 With nitrogen or dry...

Страница 58: ...or Low Oil Pressure OP change the oil filter element Examine the oil filter element for the pres ence of aluminum particles Aluminum gas seal rings can contact the impeller and account for some alumi...

Страница 59: ...he unit should be leak tested quarterly Any leaks found must be repaired immediately COOLER AND CONDENSER The major portion of maintenance on the condenser and cooler will deal with the maintaining th...

Страница 60: ...controls operation and safety not be changed If the set tings are changed without YORK s approval the warranty will be jeopardized 3 A 5 11 year life battery is part of the RTC Real Time Clock To repl...

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