York Millennium YCAS 310 Installation Operation & Maintenance Download Page 47

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FORM 201.10-NM3

YORK INTERNATIONAL

YCAS 310 - 380 SYSTEMS 1 AND 2

CONNECTION DIAGRAM

ACROSS-THE-LINE START

LD02020

Summary of Contents for Millennium YCAS 310

Page 1: ...ium AIR COOLED SCREW LIQUID CHILLERS AIR COOLED SCREW HERMETIC Supersedes Nothing Form 201 10 NM3 798 YCAS 310 380 STYLE D YCAJ 3 SYSTEM With EPROM Standard Brine Metric Models Combined 031 01714 103...

Page 2: ...perating Hours Start Counter Key 76 3 7 Options Key Dip Switch Settings 76 4 PRINT KEYS 80 4 1 General 80 4 2 Operating Data Key 80 4 3 Operating Data Local Display Messages 80 4 4 Operating Data Remo...

Page 3: ...on circuit operates correctly GENERAL CHILLER INFORMATION The unit structure is heavy gauge galvanized steel covered with a baked on enamel Base rails are of formed double thickness painted plate stee...

Page 4: ...following characteristics of the unit YC A S 310 46 Y D YORK Chiller YC York Chiller Design Series Air Cooled Type Start Y WYE Delta X Across the Line Compressor Design Series S Screw Unit Model Volta...

Page 5: ...de 8 60 Hz Economized 2 5 Module L 32 x 83 9 50 Hz Economized 3 Module 3 row deep coils 10 60 Hz Economized 3 Module in both systems M 32 x 83 4 row deep coils Gear in System 1 XHS 120 Compressor in S...

Page 6: ...EAVING WATER COOLER FLOW AIR ON NUMBER TEMPERATURE F GPM 3 CONDENSER F YCAS YDAS MIN 1 MAX 2 MIN MAX MIN MAX 4 310 40 52 400 1400 0 130 340 40 52 400 1400 0 130 360 40 52 400 1400 0 130 380 40 52 400...

Page 7: ...ing water temperature higher than 11 C contact your nearest YORK office for application guidelines 3 The evaporator is protected against freeze up to 28 8 F with an electrical heater as standard 4 Ope...

Page 8: ...1 91 COOLER FLOW GPM MIN 400 400 400 400 MAX 1400 1400 1400 1400 CONDENSER Sys 1 4 4 4 4 ROWS Sys 2 4 4 4 4 Sys 3 4 4 4 4 CONDENSER FACE AREA FT 2 443 443 443 443 NO 12 12 12 12 CONDENSER HP KW 3 2 8...

Page 9: ...5 345 COOLER FLOW L sec MIN 25 2 25 2 25 2 25 2 MAX 88 3 88 3 88 3 88 3 CONDENSER Sys 1 4 4 4 4 ROWS Sys 2 4 4 4 4 Sys 3 4 4 4 4 CONDENSER FACE AREA M2 41 41 41 41 NO 12 12 12 12 CONDENSER HP KW 3 2 8...

Page 10: ...e kept clear of all obstructions or clutter that would impede air flow to the unit In installations where winter operation is intended and snow accumulations are expected additional unit height must b...

Page 11: ...FORM 201 10 NM3 11 YORK INTERNATIONAL YCAS 310 380 DIMENSIONS English Units LD01594 LD01593...

Page 12: ...ear of all obstructions or clutter that would impede air flow to the unit In installations where winter operation is intended and snow accumulations are expected additional unit height must be provide...

Page 13: ...FORM 201 10 NM3 13 YORK INTERNATIONAL YCAS 310 380 DIMENSIONS SI Units LD01598 LD01597...

Page 14: ...Code and using copper connectors only FIeld wiring must also comply with local codes 8 A ground lug is provided from each compr system to accommodate field grounding conductor per N E C Article 250 54...

Page 15: ...2 6 250 1 0 500 171 262 838 5 0 575 191 200 250 300 250 300 2 6 250 1 0 500 137 204 655 4 9 380 145 400 500 700 500 700 2 1 0 500 NA 315 483 NA 5 2 YCAS360 460 333 400 400 500 400 500 2 6 250 1 0 500...

Page 16: ...YORK INTERNATIONAL 16 YCAS 310 380 CHILLER COMPONENTS 28508 r A CONDENSER COILS FANS POWER PANEL CONTROL PANEL COMP 1 COMP 2 COMP 3...

Page 17: ...FORM 201 10 NM3 17 YORK INTERNATIONAL YCAS 310 380 CHILLER COMPONENTS 27507A FILTER DRIER WATER OUTLET THERMOSTAT WATER INLET...

Page 18: ...SOLENOID SUCTION SERVICE VALVE SUCTION PRESSURE TRANSDUCER DISCHARGE MUFFLER OIL DRAIN LINE DISCHARGE SERVICE VALVE DISCHARGE PRESSURE TRANSDUCER OPTIONAL DISCHARGE MUFFLER DISCHARGE PIPING SUCTION S...

Page 19: ...FORM 201 10 NM3 19 YORK INTERNATIONAL 28512A SYS 1 TXV SYS 1 SIGHT GLASS SYS 1 LIQUID LINE SOLENOID SYS 2 LIQUID LINE SOLENOID SYS 2 TXV SYS 2 SIGHT GLASS...

Page 20: ...IL PRESSURE TRANSDUCER OIL FILTER SUB COOLER ECONOMIZER 15 TON TXV LIQUID SUPPLY SOLENOID 15 TON TXV ECONOMIZER PIPING OIL INJECTION PIPING OIL SEPARATOR 5 TON TXV MOTOR COOLING PIPING LIQUID INJECTIO...

Page 21: ...FORM 201 10 NM3 21 YORK INTERNATIONAL 28514A FILTER DRYER LIQUID STOP VALVE...

Page 22: ...YORK INTERNATIONAL 22 COMPRESSOR COMPONENTS LD01091 COMPRESSOR SIDE VIEW COMPRESSOR SIDE VIEW MAY BE ON SIDE OR REAR OF MOTOR COVER...

Page 23: ...FORM 201 10 NM3 23 YORK INTERNATIONAL LD01092 NOTE On newer production chillers this valve will not be located on the compressor COMPRESSOR TOP VIEW COMPRESSOR FRONT VIEW COMPRESSOR REAR VIEW...

Page 24: ...YORK INTERNATIONAL 24 FIG 2 COMPRESSOR GAS FLOW LD01093 GAS OFF ECONOMIZER HEAT EXCHANGER OIL INJECTION DISCHARGE SUCTION LIQUID INJECTION MOTOR TERMINAL BOX...

Page 25: ...FORM 201 10 NM3 25 YORK INTERNATIONAL LD01285 FIG 3 SCREW CHILLER REFIGERANT FLOW DIAGRAM REFRIGERANT FLOW DIAGRAM...

Page 26: ...essor incorporates a complete anti friction bearing design for reduced power input and increased reliability Four separated cylindrical roller bearings handle radial loads Angular contact ball bearing...

Page 27: ...ubri cates the rotors as well as provides an oil seal against leakage around the rotors to assure refrigerant com pression volumetric efficiency The oil also provides cooling by transferring much of t...

Page 28: ...r and will not hurt the motor due to the extra torque built into the design STARTER Two types of compressor motor starting are available Across the line and optional Wye Delta Closed Tran sition Start...

Page 29: ...res to be followed to install and start up the chiller HANDLING These units are shipped as completely assembled units containing full operating charge and care should be taken to avoid damage due to r...

Page 30: ...Chiller noise is a result of compressor and fan operation Con siderations should be made utilizing noise levels pub lished in the YORK Engineering Guide for the specific chiller model If questions ari...

Page 31: ...the size of pipe in which it is to be installed See Manufacturer s Instruc tions furnished with switch The switches are to be wired to terminals in the control panels as shown in the WIRING DIAGRAM as...

Page 32: ...P 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 COPPER CONDENSER COILS OPERATING WEIGHT DISTRIBUTION LBS AND ISOLATOR LOCATION MODEL A B C D E F G H I J K L YCAS...

Page 33: ...P 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 CP 2 31 COPPER CONDENSER COILS OPERATING WEIGHT DISTRIBUTION KG AND ISOLATOR LOCATION MODEL A B C D E F G H I J K L YCAS3...

Page 34: ...wing page 5 To stop unit Emergency Stop with contacts other than those shown install the stop contact between 5 and 1 If a stop device is not installed a jumper must be con nected between terminals 5...

Page 35: ...activates the con tacts Any contacts connected to flow switch inputs or BAS inputs on termi nals 13 19 or TB3 or any other terminals must be suppressed with a YORK P N 031 00808 000 suppressor across...

Page 36: ...YORK INTERNATIONAL 36 YCAS 310 380 SYSTEMS 1 AND 2 CONNECTION DIAGRAM WYE DELTA START LD02032...

Page 37: ...FORM 201 10 NM3 37 YORK INTERNATIONAL LD02033...

Page 38: ...YORK INTERNATIONAL 38 YCAS 310 380 SYSTEMS 1 AND 2 WIRING DIAGRAM WYE DELTA START LD03094 LD03095 LD03096...

Page 39: ...FORM 201 10 NM3 39 YORK INTERNATIONAL YCAS 310 380 SYSTEMS 1 AND 2 WIRING DIAGRAM WYE DELTA START LD02035 YCAS 310 380 SYSTEM 3 COMPRESSOR TERMINAL BOX WYE DELTA START LD02055...

Page 40: ...ring specifications Also refer to cautions on the following page 5 To stop unit Emergency Stop with contacts other than those shown install the stop contact between 5 and 1 If a stop device is not ins...

Page 41: ...coil which activates the con tacts Any contacts connected to flow switch inputs or BAS inputs on termi nals 13 19 or TB3 or any other terminals must be suppressed with a YORK P N 031 00808 000 suppres...

Page 42: ...YORK INTERNATIONAL 42 YCAS 310 380 SYSTEM 3 CONNECTION DIAGRAM WYE DELTA START LD02038...

Page 43: ...FORM 201 10 NM3 43 YORK INTERNATIONAL LD02039...

Page 44: ...YORK INTERNATIONAL 44 YCAS 310 380 SYSTEM 3 CONNECTION DIAGRAM WYE DELTA START LD03098 LD03097 LD03099...

Page 45: ...rating and wiring specifications Also refer to cautions on the following page 5 To stop unit Emergency Stop with contacts other than those shown install the stop contact between 5 and 1 If a stop dev...

Page 46: ...ch activates the con tacts Any contacts connected to flow switch inputs or BAS inputs on termi nals 13 19 or TB3 or any other terminals must be suppressed with a YORK P N 031 00808 000 suppressor acro...

Page 47: ...FORM 201 10 NM3 47 YORK INTERNATIONAL YCAS 310 380 SYSTEMS 1 AND 2 CONNECTION DIAGRAM ACROSS THE LINE START LD02020...

Page 48: ...YORK INTERNATIONAL 48 LD02021...

Page 49: ...FORM 201 10 NM3 49 YORK INTERNATIONAL YCAS 310 380 SYSTEMS 1 AND 2 CONNECTION DIAGRAM SYSTEM WIRING ACROSS THE LINE START LD03100 LD03101 LD03102...

Page 50: ...YORK INTERNATIONAL 50 YCAS 310 380 SYSTEMS 1 AND 2 COMPRESSOR TERMINAL BOX ACROSS THE LINE START LD02023 YCAS 310 380 SYSTEM 3 COMPRESSOR TERMINAL BOX ACROSS THE LINE START LD02029...

Page 51: ...ting and wiring specifications Also refer to cautions on the following page 5 To stop unit Emergency Stop with contacts other than those shown install the stop contact between 5 and 1 If a stop device...

Page 52: ...ch activates the con tacts Any contacts connected to flow switch inputs or BAS inputs on termi nals 13 19 or TB3 or any other terminals must be suppressed with a YORK P N 031 00808 000 suppressor acro...

Page 53: ...FORM 201 10 NM3 53 YORK INTERNATIONAL YCAS 310 380 SYSTEM 3 CONNECTION DIAGRAM ACROSS THE LINE START LD02026...

Page 54: ...YORK INTERNATIONAL 54 LD02027...

Page 55: ...FORM 201 10 NM3 55 YORK INTERNATIONAL YCAS 310 380 SYSTEM 3 CONNECTION DIAGRAM SYSTEM WIRING ACROSS THE LINE START LD03103 LD03104 LD03105...

Page 56: ...ta as well as fault history data from recent safety shutdowns PROGRAM SETUP KEYS Entry Keys see Section 5 The numeric and associated keys are used for enter ing data as required for programming of the...

Page 57: ...ther 2 or 3 independent refrigerant systems YCAS 2 system chillers are configuried as a single self contained section with a single control panel con trolling the 2 refrigerant systems YCAS 3 system c...

Page 58: ...down or power failure is expected for extended periods it may be desirable to disable the clock to save battery life The clock can then be reactivated and reprogrammed when the chiller is returned to...

Page 59: ...me the contacts open the chiller will shut down and the NO RUN PERM message will be displayed The location of the flow switch Start Stop connections is shown in Section 1 9 NOTE Never bypass a flow sw...

Page 60: ...et point programmed into memory In the example above if the programmed setpoint 44 F the new setpoint after the 9 second contact closure would be 44 F 12 F 56 F This new setpoint can be viewed on the...

Page 61: ...d with a RC suppressor YORK Part Number 031 00808 000 across the inductive coil Typically several are supplied loose with the panel Failure to install suppressors will result in nui sance faults and p...

Page 62: ...MICROCOMPUTER CONTROL CENTER COMPONENT LOCATION 27962A I O EXPANSION BOARD POWER SUPPLY BOARD RELAY OUTPUT BOARD 1 RELAY OUTPUT BOARD 2 TB4 TERMINAL BLOCK TERMINALS 13 19 FLOW SWITCH TEMP PWM LEAD LAG...

Page 63: ...S 2 WYE DELTA START RESISTORS TB1 115VAC ALARM EVAP PUMP USER CONNECTION TERMINALS 2A SYS 2 TRANSITION CONTACTOR 27963A SYS 1 1 2 3 C T S POWER SUPPLY BOARD 1 CR 2 TR SYS 2 4 5 6 C T S POWER SUPPLY BO...

Page 64: ...the resulting lead lag determination are dis cussed below 1 The micro automatically defaults the lead to SYS 1 and the lag to SYS 2 if both compressors are ready to start Anti recycle Timers timed out...

Page 65: ...ttempts to balance run time between the two compressors in either the Master or Subordinate modules A number of con ditions can occur which will prevent this from happen ing Factors determining lead l...

Page 66: ...ividual system operational status The messages displayed include running status cooling demand fault status external cycling device status load limiting and anti recycle timer status The display will...

Page 67: ...R U N S Y S N O C O O L L O A D S Y S N O C O O L L O A D until this situation is corrected See Section 3 7 and 8 2 for more details NOTE It is extremely important that the programmed settings corresp...

Page 68: ...as failed the micro processor will not allow the chiller to run and the W A R N I N G L O W B A T T E R Y WARNING LOW BATTERY message will appear Under low battery conditions the only way to run the c...

Page 69: ...t does not become excessively high causing a fault see Section 8 2 High Average Current Unload Point Suction Temperature Limiting The Suction Temperature Limiting message applies only when the chiller...

Page 70: ...s sure from exceeding safe working limits This safety is a backup for the mechanical High Pressure Cutout in the system The Discharge Pressure Safety is program mable for a range of values below the s...

Page 71: ...C T I O N This cutout value increases with time until after 270 seconds it equals the programmed cutout value If suction pressure falls below the calculated cutout value before 270 seconds the system...

Page 72: ...or twenty seconds Wye Delta Starters of compressor operation From this time the system will be shut down if average motor current is less than 5 of FLA for ambient temperatures 25 F 10 of FLA for ambi...

Page 73: ...cropro cessor and the system is shut down Auto restart will be permitted after shutdown when dis charge pressure drops below 330 PSIG and the HP contacts close A fault lock out will result if safety t...

Page 74: ...hese characters indicate the actual values are greater than or less than the values which are being displayed but are outside the ability of the micro to give an actual reading This is unlikely to occ...

Page 75: ...ing the discharge separator and oil pres sure reaching the compressor It is computed by sub tracting oil pressure measured after the oil line filter from discharge pressure oil in the oil separator is...

Page 76: ...m ISN EMS current limits and ISN lag compressor start percentage Example displays and detailed explanations are as follows This display shows the average compressor motor cur rent and each individual...

Page 77: ...ecting this mode also auto programs the Low Chilled Liquid Cut Out at 36 F and the Suction Pressure Cut Out at 44 PSIG and are not adjustable Closed Brine Cooling Mode is for brine glycol applications...

Page 78: ...lected for models using refrigerant R22 Incorrect selection of this switch may cause serious damage to the chiller Closed Wye Delta Mode MUST be used for chillers with multi contactor and resistor Wye...

Page 79: ...r Cooling Brine Cooling 2 Standard Low Ambient Ambient Control Control 3 Local Control Remote Control Mode Mode 4 Thermal Expansion Thermal Expansion Valves Valves 5 English Units SI Units Readouts Re...

Page 80: ...e Operating Data key is de scribed in the following sections In example displays is used to indicate system number where appropriate 4 3 OPERATING DATA LOCAL DISPLAY MESSAGES YCAS 2 SYSTEM MODELS When...

Page 81: ...P L A Y M A S T E R D A T A This message advises the number of reverse running pairs of condenser fans on this system Once the System Data sequence has been repeated for the second system pressing the...

Page 82: ...System 1 followed by the data for Sys tem 2 Pressing the Operating Data key twice jumps directly to this point The data for each system is given by the five displays as described under YCAS 2 System M...

Page 83: ...aster Section and System 3 for the Subordinate Section This message gives the rate of change of the chilled liquid leaving temperature in degrees per minute leav ing the Master and Subordinate section...

Page 84: ...ERMISSIVE ON SYSTEM 2 DATA COMPRESSOR STATUS ON RUN TIME 0 0 26 11 D H M S AVERAGE MTR 65 FLA PHASE L1 MTR 65 FLA PHASE L2 MTR 65 FLA PHASE L3 MTR 65 FLA DIFF OIL PRESSURE 4 PSID SUCTION PRESSURE 70 P...

Page 85: ...Water Temperature at the time of the fault This message indicates the Leaving Water Tempera ture at the time of fault This display shows the Low Water leaving Cutout pro grammed at the time of the fa...

Page 86: ...wo sections One section contains numbers 1 and 2 refrigerant sys tems plus the common 3 circuit evaporator This section is called the Master section The second section contains number 3 refrigerant sy...

Page 87: ...he system history data for the master section of the chiller i e the data for System 1 followed by the data for System 2 The data for each system is given by twenty informa tion displays as described...

Page 88: ...ault This message shows the Cooling Range Control Range programmed at the time of the fault This display shows the Target temperature programmed at the time of the fault This message indicates the out...

Page 89: ...F OIL PRESSURE 2 9 PSID SUCTION PRESSURE 60 8 PSIG SATURATED SUCTION 34 0 DEGF SUCTION TEMP 43 3 DEGF SUPERHEAT 8 7 DEGF DISCHARGE PRESSURE 230 5 PSIG SATURATED DISCHARGE 109 9 DEGF DISCHARGE TEMP 138...

Page 90: ...RETURN WATER TEMP 49 6 DEGF LEAVING WATER TEMP 44 7 DEGF LOW WATER CUTOUT 36 0 DEGF COOLING RANGE 41 0 TO 44 6 DEGF TARGET TEMP 42 8 DEGF AMBIENT AIR TEMP 70 0 DEGF LOW AMBIENT CUTOUT 25 0 DEGF LOW P...

Page 91: ...d The Enter key is also used to scroll through available data when using the Program Operating Data His tory or Set Schedule Holiday keys 5 4 CANCEL KEY When the Cancel key is pressed the cursor will...

Page 92: ...e by program ming the acceptable deviation or range of leaving tem peratures around the desired Target temperature This range is called the Control Range and has the Target temperature at its midpoint...

Page 93: ...load up the lead ocmpressor to match cooling demand If the lead compressor reaches a programmed percent age of full load Lag Compressor Start Point and de mand continues to rise the first lag compres...

Page 94: ...compressor are maintained at constant load and only the second lag compressor continues to unload If the second lag compressor shuts down ac cording to decreasing load and demand continues to fall th...

Page 95: ...nals the two compressors in each group are started load unloaded and shutdown by the Individual Panel Algorithms control as described in Section 6 2 for 2 system YCAS chillers During very low cooling...

Page 96: ...he Low Limit Water Tem perature Key in the upper limit High Limit Water Tem perature of the CR and press the Enter key The display automatically shows the Target tempera ture which is the midpoint of...

Page 97: ...he new value in memory R E M S E T P O I N T 4 0 0 R E M R A N G E 2 0 F These values can now be programmed The recom mended CR and TARGET for the individual panels should be programmed 2 0 4 0 F belo...

Page 98: ...AM PM key to change to the op posite time period NOTE The AM PM key can only be used once If an error is made press the Cancel key and begin again Next key in the required date of the month the cursor...

Page 99: ...necessary When the MANUAL OVERRIDE key is pressed the low battery message will disappear If a power failure should again occur the above process will again need to be repeated to bring the chiller bac...

Page 100: ...nter will cause the new value to be lost To reprogram password protected values an access code must be entered as follows When the Program key is first pressed and the above message is displayed key i...

Page 101: ...e below which the chiller may not operate If the ambient temperature falls 1 F below this point the chiller will shut down Restart will occur automati cally when temperature rises more than 1 F above...

Page 102: ...xces sive current which would cause compressor shutdown due to extremely high ambient high chilled liquid tem perature and condenser malfunction caused by dirt or fan problems If the programmable limi...

Page 103: ...below the cutout point a 90 second transient timer begins during which the suction pressure must be greater than Programmed x 100 transient time left Cutout 100 Example If Programmed Cutout 44 PSIG an...

Page 104: ...rential Off is not less than 20 A setting of 20 30 is recom mended for the Lag Panel Differential Off for most applications To program the Lag Panel Differential key in the required setting and press...

Page 105: ...equired setting and press the Enter key to store the value into memory and scroll to the next display L A G C O M P R E S S O R D I F F E R E N T I A L O F F 3 0 Fan Control Discharge Pressure Setpoin...

Page 106: ...pressure converted to tempera ture or CTP at 100 load at design conditions for each system on the chiller This also allows the micro to cal culate approximate compressor slide valve position which is...

Page 107: ...advance to the next programmable limit E C O N O M I Z E R V A L V E O N P O I N T 5 0 E C O N O M I Z E R V A L V E O F F 4 0 NOTE After selecting the lead compressor the micro will determine the sta...

Page 108: ...Current Unload 105 Anti Recycle Timer 600 sec Leaving Chilled Liquid Cutout 36 F Suction Pressure Cutout R22 44 PSIG R134a 19 PSIG Lag Panel Start Pt YDAS Only 50 Lag Panel Diff Off YDAS Only 20 Lag C...

Page 109: ...ompressor Motor FLA 60 Hz Models MODEL 200 VOLTS 17 230 VOLTS 28 460 VOLTS 46 575 VOLTS 58 YCAS ENG DATA SYS 1 FLA SYS 2 FLA SYS 1 FLA SYS 2 FLA SYS 1 FLA SYS 2 FLA SYS 1 FLA SYS 2 FLA 140 6A2A2KN6A 3...

Page 110: ...128 8 F 246 6S7S7NN6A 130 1 F 130 1 F 216x 10H5H5NN6A 115 4 F 115 4 F 236x 10P6H6NN6A 118 6 F 115 3 F 266x 10S7S7NN6A 119 6 F 119 6 F Design Condensing Temperature 60 Hz Models MODEL ENG DATA ALL VOL...

Page 111: ...ginally ran in the reverse direction The first pair of forward fans will also continue to run The point at which each pair of fans cycles off is also programmable This is accomplished in the PROGRAM M...

Page 112: ...hut the system down and as sure there is an oil level showing in the bottom or top sight glass with the com pressor off If it is necessary to add oil connect a YORK oil pump to the charging valve on t...

Page 113: ...e values in the chart below PROGRAMMED VALUES Refrigerant Type __________________________ Dischg Press Cut out ____________ PSIG kPa Low Amb Cut out ___________________ F C High Amb Cut out __________...

Page 114: ...e chart The subcooling temperature of each system should be calculated by recording the temperature of the liquid line at the outlet of the condenser and subtracting it from the recorded liquid line p...

Page 115: ...nts for the system and the thermal expansion valve to respond and settle out Assure that superheat is set between 10 15 F q 1 Record the motor gas temperature economizer pressure economizer pressure c...

Page 116: ...load on the board NOTE Contact YORK Service before Replacing circuit Boards NO RUN PERMISSIVE 1 No chilled liquid flow 1 Check chilled liquid flow 2 Flow switch improperly 2 Check that the flow switch...

Page 117: ...tor protector wiring and motor problems Assure the motor protector is not tripped due to a tripped mechanical high pressure switch 3 Defective Relay Output 3 Relay Output Board Board defective CONTACT...

Page 118: ...ctive suction pressure 6 Replace transducer or transducer or faulty wiring repair wiring HIGH DISCHARGE 1 Condenser fans not 1 Check fan motor fuses PRESSURE FAULT operating or operating and contactor...

Page 119: ...arator 5 Add oil to separator HIGH OIL TEMP 1 Dirty oil cooling coil 1 Clean oil cooling coil 2 Faulty oil temp 2 Check replace valve diverting valve 3 Fault oil temp sensor 3 Check replace oil temp s...

Page 120: ...d ambient a drop in temperature incorrectly by thermistor temp is within or 15 F of a thermometer placed next to the OAT sensor 3 Fans rotating backwards 3 Air flow from forward fans must be up Correc...

Page 121: ...r 3 Compare the display with temperature sensor a thermometer Should be within or 2 degrees Lack of Cooling Effect 1 Fouled evaporator surface 1 Contact the local YORK Low suction pressure service rep...

Page 122: ...7 350 6 81 1 178 352 4 81 7 179 354 2 82 2 180 356 0 82 8 181 357 8 83 3 182 359 6 83 9 183 361 4 84 4 184 363 2 85 0 185 365 0 85 6 186 366 8 86 1 187 368 6 86 7 188 370 4 87 2 189 372 2 87 8 190 374...

Page 123: ...FORM 201 10 NM3 123 YORK INTERNATIONAL...

Page 124: ...S Olympic Team 36USC380 P O Box 1592 York Pennsylvania USA 17405 1592 Subject to change without notice Printed in USA Copyright by York International Corporation 1997 ALL RIGHTS RESERVED Form 201 10...

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