System Inputs ............................34 SECTION COMMISSIONING Preparation ............................41 Preparation – Power Off ........................41 First Time Start-up ..........................43 SECTION OPERATION General Description ..........................44 Start-up ............................44 Normal Running and Cycling ........................ 44 Shutdown ............................44 YORK INTERNATIONAL...
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Ancillary Circuit Boards ......................102 Circuit Breakers ........................103 Current Transformers (C.T.) ....................103 Transformers ......................... 103 Motor Protector Modules ....................... 103 1.10 EMS / BAS Connections ....................... 105 1.11 Microprocessor Board Layout ....................107 1.12 Logic Section Layout ......................108 YORK INTERNATIONAL...
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Set Schedule / Holiday Key ....................137 Manual Override Key ......................138 8. PROGRAM KEY ..........................139 General ..........................139 Program Key – User Programmable Values ................ 139 Programming “Default” Values ....................143 Condenser Fan Control ......................144 YORK INTERNATIONAL...
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TABLE 2 - Condenser Fan Control and Fan Contactor Data for DXST Units with 4 Fans System ..144 TABLE 3 - Condenser Fan Control and Fan Contactor Data for DXST Units with 5 Fans System ..144 YORK INTERNATIONAL...
NOT be installed inside the micro panel. NO external wiring is allowed to be run through the micro panel. All wiring must be in accordance with YORK’s published specifications and must be performed ONLY by qualified YORK personnel. YORK will not be responsible for damages/problems resulting from improper connections to the controls or application of improper control signals.
If there is any question in the mind While YORK makes no commitment to update or pro- of operating/service personnel as to the applicability vide current information automatically to the manual...
Center. See Commissioning, page 41. This manual and the Microprocessor Operating Instruc- tions contain all the information required for correct • Only genuine YORK-approved spare parts, oils and installation and commissioning of the unit, together refrigerants must be used. Recommendations on with operating and maintenance instructions.
This manual, and any other document supplied with the unit, are the property of YORK which reserves all Electrical rights. They may not be reproduced, in whole or in part, The unit must be grounded. No installation or mainte-...
When operated, each removes the electrical cial safety hazards. Use of gloves and safety glasses supply from the control system, thus shutting down the unit. are, however, recommended when working on the unit. YORK INTERNATIONAL...
Non-flammable at atmospheric conditions. data Containers Fire exposed containers should be kept cool with water sprays. Containers may burst if overheated. Fire fighting Self contained breathing apparatus and protective clothing must be worn in protective equipment fire conditions. YORK INTERNATIONAL...
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General Chiller Information & Safety MATERIAL SAFETY DATA REFRIGERANT OIL DATA: YORK “L” OIL SAFETY DATA Classification Non-hazardous In contact with skin Minimally irritating. No first aid necessary. Exercise reasonable personal cleanliness includ- ing cleansing exposed skin areas several times daily with soap and water. Launder soiled work clothes at least weekly.
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FORM 201.18-NM8 MATERIAL SAFETY DATA Section 1 – PRODUCT NAME AND INFORMATION Product (Trade Name and Synonyms): YORK “L” Oil Chemical Name: Ester Chemical Family: Polyol Ester Formula: Proprietary CAS#: Proprietary Section 2 – COMPONENTS AND HAZARD STATEMENT This product is non-hazardous. The product contains no known carcinogens. No special warning labels are required under OSHA 29 CFR 1910.1200.
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The information in this material safety data sheet should be provided to all who use, handle, store, transport, or are otherwise exposed to this product. CPI believes the information in this document to be reliable and up to date as of the date of publication, but makes no guarantee that it is. YORK INTERNATIONAL...
FIG. 1 – COMPONENT LOCATIONS INTRODUCTION All exposed power wiring is be routed through liquid- tight, non-metallic conduit. YORK YCAS eco chillers are designed for water or water-glycol cooling. All units are designed to be lo- General Description cated outside on the roof of a building or at ground The Air-Cooled Screw Chiller utilizes many compo- level.
They have a design working pressure of 31 bar 00485VIP (450 PSIG). FIG. 2 – SCREW COMPRESSOR YORK INTERNATIONAL...
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The oil (YORK “L” oil – a POE oil used for all refrig- erant applications), which drains back into the com- pressor through a replaceable 0.5 - 3.0 micron oil filter, The automatic spring return of the capacity control valve and oil supply solenoid, is at high pressure.
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The 7-segment dis- lems that could cause excessive motor current. This play will display either a stationary or a flashing alpha- is accomplished by sending 3-phase current signals numeric value which can be decoded by the operator. YORK INTERNATIONAL...
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Motor off or unloaded < 5A AC current level.(Running) High current fault. Loaded phase to phase current imbalance > 17%. It is recommended that an YORK Ser- Unloaded phase to phase current vice Technician or the YORK factory imbalance > 25%. be consulted before changing these Improper incoming phase rotation.
The standard display language is English, with 4 other deenergizes 1S/2S and closes the normally closed 1S (SYS languages available. 1) or 2S (SYS 2) contacts, energizing motor contactor 2M (SYS 1) or 4M (SYS 2), completing the “DELTA” con- nection of the motor. YORK INTERNATIONAL...
YORK ISN or building automation system. mounted control circuit transformer. The supply with appropriate branch circuit protection in accordance with...
1.0 g accelerated force in all directions to 51 mm (2"). Level adjustable, Wire enclosure – Heavy gauge welded wire mesh deflection may vary slightly by application. (Field- guards mounted on the exterior of the unit (Factory- or mounted). field-mounted). YORK INTERNATIONAL...
Sales Order. Major damage must be reported immediately to your If the unit is to be put into storage, prior to installation, local YORK representative. the following precautions should be observed: MOVING THE CHILLER • Ensure that all openings, such as water connections, Prior to moving the unit, ensure that the installation site are securely capped.
If the enclosure is of louvered construc- least 120 mm (4-3/4") wide at the contact points. This tion the same requirement of static pressure loss ap- will allow vibration isolators to be fitted if required. plies as for ducts and attenuators stated above. YORK INTERNATIONAL...
1" N.P.T. connection can be obtained Technical Data Section, identify each mount and its cor- from YORK as an accessory for the unit. Alternatively, rect location on the unit. a differential pressure switch sited across an orifice plate may be used, preferably of the high / low limit type.
Aerated, brackish or salt water is not recommended for all low and high points in the pipework to permit drain- use in the water system(s). YORK recommends that a age of the system and to vent any air in the pipes.
Where cross winds may occur, any ductwork must be It is recommended that a piece of pipe is fitted to each supported to prevent side loading on the unit. valve and directed so that when the valve is activated the YORK INTERNATIONAL...
This will prevent recir- tion (not supplied by YORK). culation of air when only one of the fans is running. Units are supplied with outlet guards for safety and to prevent damage to the fan blades.
RS-232 port. override the customer master start / stop so that the YORK contact can start the pump in the event of a low Remote Set Point Offset – Temperature temperature liquid condition.
System No. 1 Alarm Contacts System No. 2 Run Current Chilled Liquid Circulating Pump Start Temperature System No. 2 Print Alarm Contacts Chiller Run CONNECTION Isolator POINTS FOR Auxiliary EMERGENCY Interlock STOPS LD03502 FIG. 12 – CUSTOMER CONNECTIONS YORK INTERNATIONAL...
Compressor Oil Verify that the site voltage supply corresponds to the To add oil to a circuit – connect a YORK hand oil pump unit requirement and is within the limits given in the (Part No. 470-10654-000) to the 6 mm (1/4") oil charg- Technical Data Section.
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Technical Data Section. Operation grammed by pressing the ‘Remote Reset Temp’ key. outside of these limits is undesirable and could cause (See Section 6.) damage. YORK INTERNATIONAL...
‘ON’ po- erant is in the system, the bubbles will disappear and sition and restart the unit. be replaced by a solid column of liquid. YORK INTERNATIONAL...
The units are designed to work independently, or in con- automatic. After an initial period at minimum capacity junction with other equipment via a YORK ISN build- on the lead compressor, the control system will adjust ing management system or other automated control sys- the unit load depending on the chilled liquid tempera- tem.
1. For leaving brine temperature below 4.4°C, contact your nearest YORK office for application requirements. 2. For leaving water temperature higher than 13°C, contact the nearest YORK office for application guidelines. 3. The evaporator is protected against freeze-up to -28.8°C with an electrical heater as standard.
1.15 1.10 1.05 A = Correction Factor ˚C B = Mean Temperature through Cooler C = Concentration W/W PROPYLENE GLYCOL Excessive flow, above the max GPM, will damage the evaporator. ˚C LD03504 FIG. 15 – GLYCOL CORRECTION FACTORS YORK INTERNATIONAL...
HIGH PRESS. FANS OPTION 1 PRESSURE (Pa) HIGH PRESS. FANS OPTION 2 SLOW SPEED FANS ELECTRICAL THREE PHASE 50 Hz (V) * Maximum Ambient w/ High Ambient Kit is 52°C. SOUND POWER DATA (PRELIMINARY) MODEL YCAS 0425EB 0475EB 0515EB 0555EB 0575EB 0605EB YORK INTERNATIONAL...
Maximum Refrigerant Side Pressure, bar Minimum Chilled Water Flow Rate, l/s 9.53 10.60 11.67 12.37 13.06 13.63 Maximum Chilled Water Flow Rate, l/s 37.85 42.27 46.87 48.45 48.45 48.45 Water Connections, inches NOTE: 1. Optional 21 bar Waterside available. YORK INTERNATIONAL...
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FORM 201.18-NM8 This page intentionally left blank. YORK INTERNATIONAL...
(3) 2/0-400 188.0 857.0 23.0 857.0 23.0 0575EB (3) 2/0-400 188.0 857.0 23.0 857.0 23.0 0605EB (3) 2/0-400 173.0 857.0 23.0 857.0 23.0 Option NOT available for units with CE mark. See page 55 for Electrical Data footnotes. YORK INTERNATIONAL...
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SYSTEM #1 SYSTEM #2 CHILLER 11, 12 11,12 COMPRESSOR DATA FAN DATA COMPRESSOR DATA FAN DATA MODEL X-LRA X-LRA YCAS 0425EB 23.0 23.0 0475EB 23.0 23.0 0515EB 23.0 23.0 0555EB 23.0 23.0 0575EB 23.0 23.0 0605EB 23.0 23.0 YORK INTERNATIONAL...
“Optional Field Provided 115-1Ø MicroPanel Supply Suitable for: Y-∆ ∆ ∆ ∆ ∆ Start and Across-The-Line Start SEE NOTE 2 See page 57 for notes. LD05555 FIG. 17 – OPTIONAL SINGLE-POINT POWER SUPPLY CONNECTION WITH INDIVIDUAL SYSTEM CIRCUIT BREAKERS YORK INTERNATIONAL...
1. – – – – – – – Dashed Line indicates Field Provided Wiring. 2. The above recommendations are based on the National Electrical Code and using copper conductors only. Field wiring must also comply with local codes. YORK INTERNATIONAL...
Transient Voltage Suppression Terminal Block for Customer Connections Terminal Block for Customer Low Voltage (Class 2) Connections. See Note 2 Terminal Block for YORK Connections Only Wiring and Components by YORK Optional Equipment Wiring and/or Components by Others FIG. 20 – ELEMENTARY DIAGRAM – ACROSS-THE-LINE START...
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FORM 201.18-NM8 WIRING DIAGRAM ACROSS-THE-LINE START FIG. 20 – CONTINUED LD06967 YORK INTERNATIONAL...
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Technical Data ELEMENTARY DIAGRAM FIG. 20 – CONTINUED YORK INTERNATIONAL...
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Alarm cir- cuitry, or pilot relays for pump starters wired through motor contactor auxiliary contacts must be suppressed with YORK P/N 031-00808-000 suppressor across the relay/contactor coil. Any contacts connected to flow switch inputs or BAS inputs on ter-...
Transient Voltage Suppression Terminal Block for Customer Connections Terminal Block for Customer Low Voltage (Class 2) Connections. See Note 2 Terminal Block for YORK Connections Only Wiring and Components by YORK Optional Equipment Wiring and/or Components by Others FIG. 23 – ELEMENTARY DIAGRAM – WYE-DELTA START...
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FORM 201.18-NM8 WIRING DIAGRAM WYE-DELTA START FIG. 23 – CONT’D LD03229 YORK INTERNATIONAL...
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Technical Data ELEMENTARY DIAGRAM FIG. 23 – CONTINUED YORK INTERNATIONAL...
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Alarm cir- cuitry, or pilot relays for pump starters wired through motor contactor auxiliary contacts must be suppressed with YORK P/N 031- 00808-000 suppressor across the relay/contactor coil. Any contacts connected to flow switch inputs or BAS inputs on ter-...
Technical Data LEGEND – FIGS. 20 THROUGH 25 CONNECTION DIAGRAM ELECTRIC BOX DXST DIRECT DRIVE FIG. 26 – CONNECTION DIAGRAM LD03281 YORK INTERNATIONAL...
Site restrictions may compromise minimum clearances indicated below, resulting in unpre- dictable air flow patterns and possible diminished performance. YORK’s unit controls will optimize operation without nuisance high pres- sure safety cutout; however, the system designer must consider potential performance degradation. Access to the unit control center assumes the unit is no higher than on spring isolators.
Site restrictions may compromise minimum clearances indicated below, resulting in unpre- dictable air flow patterns and possible diminished performance. YORK’s unit controls will optimize operation without nuisance high pres- sure safety cutout; however, the system designer must consider potential performance degradation. Access to the unit control center assumes the unit is no higher than on spring isolators.
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CENTER OF GRAVITY (Copper) YCAS YCAS 0605 3137 1102 0605 3191 1104 2438 1981 SYS.#1 SYS.#2 POWER OPENING 8" 8" (3) 57 DIA. RIGGING (BOTH SIDES) WATER INLET WATER OUTLET HOLES (EACH SIDE) 1624 3419 2184 1900 6937 LD04704 YORK INTERNATIONAL...
1/4" shim be- ance of 1/8" between resilient washer and under- tween the upper load plate and vertical uprights. side of channel cap plate. Lower the equipment on the blocking or shimmed 10. Installation is now complete. isolators. YORK INTERNATIONAL...
Technical Data CLEARANCES 1.3 m (48") (72") LD03484 NOTES: No obstructions allowed above the unit. Only one adjacent wall may be higher than the unit. Adjacent units should be 3 meters (10 feet) apart. FIG. 37 – CLEARANCES YORK INTERNATIONAL...
The high pressure oil-free vapor is fed to the Air- cooled condenser coil and fans where the heat is removed. FIG. 38 – REFRIGERANT FLOW DIAGRAM YORK INTERNATIONAL...
DIFFERENTIAL PRESSURE CUTOUT DISCHARGE PRESSURE FAN CONTROL COOLER OCLR OIL COOLER COIL DISPLAY VALUE OIL SEPARATOR HIGH PRESSURE LOAD LIMITING HIGH TEMPERATURE CUTOUT LOW PRESSURE CUTOUT LOW TEMPERATURE CUTOUT SUPERHEAT VALVE LD06897 FIG. 39 – PROCESS AND INSTRUMENTATION DIAGRAM YORK INTERNATIONAL...
STATOR LOCKING OIL FILTER BOLT COVER PLATE OIL FILTER BLEED & EVACUATION POINT LIFTING LUG THREADED HOLE HEATER ECONOMIZER GAS IN DISCHARGE CASE DISCHARGE GAS OUT OIL INLET FROM CONDENSER LD03668 CODING COIL FIG. 41 – COMPRESSOR COMPONENTS YORK INTERNATIONAL...
SOLD BY: ________________________________ bottom or top sight glass with the com- INSTALLING pressor off. CONTRACTOR: ___________________________ If it is necessary to add oil, connect a YORK oil START-UP TECHNICIAN/ pump to the charging valve on the oil separator, COMPANY: _______________________________ but do not tighten the flare nut on the delivery tub- ing.
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After sev- eral minutes of operation, the bubbles in the sight glass will disappear and there will be a solid col- umn of liquid when the TXV stabilizes. After YORK INTERNATIONAL...
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Suction Press = ____ ____ ____ ____ °C (0°F) SUBCOOLING = 8°C (15°F) Temp = ____ ____ ____ ____ °C (0°F) The subcooling should be adjusted to 7-8°C (12 - 15°F). Superheat = ____ ____ ____ ____ °C (0°F) YORK INTERNATIONAL...
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Assure that superheat is set between 6 - 7°C (10 -12°F). YORK INTERNATIONAL...
This switch shuts down the entire chiller when placed This key is used for display and programming of the in the OFF position. The switch must be ON for the chiller operational settings and limits. chiller to operate. YORK INTERNATIONAL...
External interface is available for control of the chiller Status message indication will be displayed. See Page via a YORK ISN System or YORK Remote Control 93 for the location of this switch. Center. In addition, EMS/BAS System connections are...
The relay boards are located in the logic section of the mally. Failure to turn the Clock ON could result in the control panel(s). The boards convert 0 - 12VDC logic YORK INTERNATIONAL...
Power Supply Board which rectifies and The module also provides phase rotation protection to filters the signals to variable DC Voltage (analog). These assure the screw compressor does not rotate backwards. analog levels are then fed to the Microprocessor Board YORK INTERNATIONAL...
Micro Panel Contents 29119A SIDE VIEW 29121A 29121A TOP VIEW TOP VIEW DISPLAY SWITCH PUSHED TO LEFT INDICATES “ON” 29120A SIDE VIEW FIG. 47 – MOTOR PROTECTION MODULE YORK INTERNATIONAL...
Remote Reset Curr = 105% FLA - {(4sec - 1 sec) X (75%FLA)} shown in Section 1.12. 10 sec = 105% - 225%FLA sec Never bypass a flow switch. This will 10 sec cause damage to the chiller and void any warranties. = 82.5% FLA YORK INTERNATIONAL...
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Reset Temp = 66°C sec (relay, contactor) is supplying these 10 sec contacts, the coil of the device must be = 6°C (12°F) suppressed with a standard RC sup- pressor (50 Hz models) across the in- ductive coil. YORK INTERNATIONAL...
NOTE : Dimple is positioned at top edge Dip Switch Set (8 switches) S2 to S5 System Switches S2 = System 1 S3 = System 2 S4 = System 3 S5 = System 4 FIG. 48 – COMPONENT LAYOUT YORK INTERNATIONAL...
(150°F) and will turn on when the discharge tempera- tem or if power is lost to the control panel. The internal ture is equal to or less than 66°C (150°F). contacts are normally open (N.O.) and will close when YORK INTERNATIONAL...
YCAS 4-system models) compressor cal equipment) and the alarm circuit is swapped to the lead. This is true regardless of should fail to function, YORK will not whether the lag compressor is ON or OFF. be liable for damages.
S Y S C O M P R U N N I N G sages apply to individual systems. This message indicates that the respective compressor is running due to demand. YORK INTERNATIONAL...
MANUAL OVERRIDE restart, if a power fail- in the Logic Section(s) of the control panel(s) is/are ure occurs. open. Whenever the contact(s) is /are open, the No Run Permissive message will be displayed and the indicated system will not run. YORK INTERNATIONAL...
L I M I T I N G the Unit Switch must be cycled OFF and ON to start the unit. The Suction Temperature Limiting message applies only when the chiller is set for Water Cooling Mode (see YORK INTERNATIONAL...
2 minute start-up timer has elapsed from The Low Ambient Temperature Safety protects the the time when power is re-applied, if the AUTO RE- chiller from running in very low temperatures which START ON POWER FAILURE is enabled. Otherwise YORK INTERNATIONAL...
OFF position, then back when the maximum limit is reached the compressor will to the ON position (see Section 1.11, Fig.48 for switch be shut down. locations). YORK INTERNATIONAL...
54 - 66°C (130 - 150°F). Suction Pressure Cutout With 44 PSIG Programmed Cutout The High Oil Temperature Safety is activated after 2 minutes of compressor operation, after which if oil tem- FIG. 50 – SUCTION PRESSURE CUTOUT YORK INTERNATIONAL...
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3 Current Transformers (CTs) down the compressor. Auto restart will not occur since per motor, one on each phase. manual reset is required. A fault lockout will automati- YORK INTERNATIONAL...
A fault lockout will result if safety thresh- occur with the corresponding auto- olds are exceeded three times in a 90 minute period. matic printout. This is not a cause for concern. YORK INTERNATIONAL...
T E M P up to 3 bar (40 PSID). 2 2 . 2 ° C Saturated discharge and suction temperatures are com- Display Limits: Minimum = -20.3°C (-4.6°F) puted by converting measured pressure to temperature. Maximum = 58.8°C (137.9°F) YORK INTERNATIONAL...
R-22. Incorrect selection of this switch may cause serious damage to the chiller. “OPEN” Position: Left side of switch pushed in “CLOSED” Position: LD03511B Right side of switch pushed in LD03511A FIG. 51 – ENLARGED PHOTOGRAPH OF DIP SWITCHES ON MICROPROCESSOR BOARD YORK INTERNATIONAL...
Control Control Refrigerant R407C Refrigerant R-22 The following keys can be scrolled using the Function Spare Spare Key: Chilled Liquid Temps, System # Data, Motor Spare Spare Current and Options. Spare Spare Spare Spare Spare Spare YORK INTERNATIONAL...
“rate control” transmitted from the microprocessor to the remote and “temperature deviation from setpoint” to determine printer. As the data is transmitted it is erased from the when loading should occur. memory. YORK INTERNATIONAL...
In this case an example is shown PWM CURR –EMS PWM Current Limiting Enabled for a YCAS 2-system Chiller. PWM TEMP – EMS PWM Temp. Reset Enabled CUR/TEMP – EMS PWM Current Limiting & Temperature Reset Enabled YORK INTERNATIONAL...
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Micro Panel Contents YORK INTERNATIONAL CORPORATION SCREW CHILLER SYSTEM 2 DATA UNIT STATUS COMPRESSORS STATUS 2:04PM 10 OCT 99 RUN TIME 0- 0-15-26 D-H-M-S MOTOR CURRENT 104 AMPS 87 %FLA SYS 1 NO COOLING LOAD SUCTION PRESSURE 57 PSIG DISCHARGE PRESSURE...
This message displays the suction pressure cutout pro- grammed at the time of the fault. S H U T D O W N O C C U R R E D 5 : 5 9 A M N O V YORK INTERNATIONAL...
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ON or OFF at the time of the fault. the time of the fault. A mixed water sensor may be present when multi-unit sequencing is utilized. If no mixed water temperature sensor is installed, the dis- play will not appear. YORK INTERNATIONAL...
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5 3 . 9 ° C D S C H S H E A T < – 2 2 . 4 ° C This message indicate compressor discharge gas satu- ration temperature and superheat at the time of the fault. YORK INTERNATIONAL...
COMPRESSOR HEATER WYE-DELTA RELAY An example of the HISTORY Printout is shown. SYSTEM 2 DATA COMPRESSORS STATUS RUN TIME 0- 0-15-26 D-H-M-S YORK INTERNATIONAL CORPORATION MOTOR CURRENT 104 AMPS 87 %FLA SCREW CHILLER SUCTION PRESSURE 57 PSIG DISCHARGE PRESSURE 233 PSIG...
“AM” or “PM” on the display. For â this is not done, the new values entered will be lost and example, pressing the key when the cursor is on “PM” the original values will be returned. changes it to “AM”. YORK INTERNATIONAL...
This to control the leaving temperature to the actual Setpoint is accomplished by programming the “Setpoint” and temperature. This is accomplished by analyzing the tem- the acceptable deviation (+ or - Range) This deviation is YORK INTERNATIONAL...
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Whenever chilled liquid leaving temperature is above Fixed timers are set to minimize undershoot and over- the Setpoint, loading current will increase to allow oil shoot as a result of slide valve control. pressure to move the slide valve to increase capacity. YORK INTERNATIONAL...
As load continues to decrease, the lead compressor will processor Board must be properly programmed for be pumped down and cycled off if the chilled liquid tem- Brine Cooling (see Section 3.7). If unacceptable val- perature drops below “Setpoint – Control Range/2”. YORK INTERNATIONAL...
“0” for val- from a remote device. This feature is typically used for ues less than 10°C (or 10°F). Press the ENTER Key to demand limiting or ice storage applications. Reset is store the new value in memory. YORK INTERNATIONAL...
Press ENTER to move on to the hour part of the dis- ing the Set Time key a second time play. Next, key in the time (hours/minutes) using a lead- enters “display” mode in which the cursor will disappear and the “live” clock will be displayed. YORK INTERNATIONAL...
ON position, all 00.00s should be programmed into most special Holiday Schedule the daily schedule. This can be done manually for indi- requirements occur only vidual days or for all days by pressing Cancel and En- ter for the Monday Start / Stop schedule. occasionally. YORK INTERNATIONAL...
Daily Schedule. Once activated, Manual Override is on line. See also Section 2.5. only active for a period of 30 minutes and the follow- ing status message will be observed: M A N U A L O V E R R I D E YORK INTERNATIONAL...
Enter key is the first 5 seconds of operation after which if the cutout pressed and the display will scroll on to the next pro- point is exceeded for 3 seconds, the system will shut grammable value. down. YORK INTERNATIONAL...
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0.3 bar (5 - 70 PSIG) for tion at low refrigerant suction pressure. R-22 and R407C models. In this mode, the cutout should YORK INTERNATIONAL...
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Values below -4°C (25°F) can be motor current safety shutdown by unloading a compres- used for applications requiring chiller operation at lower sor, if current draw approaches the maximum limit cut- temperatures. If operation is occasionally needed be- YORK INTERNATIONAL...
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A fast compressor start response is needed in some applications and not in others. Al- Manual lead/lag. The ENTER key must be pressed to though the minimum setting allowed on this timer will save the selection in memory. YORK INTERNATIONAL...
To program the default values into memory, first press Leaving Chilled Liquid Temp Cutout 2°C 36°F the PROGRAM key followed by the ENTER key, to Suction Pressure Cutout R-22 3 bar 44 PSIG program the “refrigerant type.” Press the Program key YORK INTERNATIONAL...
15M, 16M, 17M, 18M, 19M 230, 231, 232 10, 14, 15 TABLE 3 – CONDENSER FAN CONTROL & FAN CONTACTOR DATA FOR DXST UNITS WITH 5 FANS/SYSTEM LD06969 FIG. 52 – CONDENSER FAN LAYOUT FOR DXST 2-COMPRESSOR UNITS YORK INTERNATIONAL...
Compressor Oil Level improper maintenance during the warranty period, Check the compressor oil level after the compressor YORK shall not be liable for costs incurred to return has been operating on ‘FULL LOAD’ for approximately the unit to satisfactory condition.
Full unit model number, serial number, application and de- tails of the parts required. All requests for parts should be made to your local YORK Sales and Service Center. RECOMMENDED COMPRESSOR OILS The correct type of oil must be used in the unit as shown on the unit data plate and labels.
Check that the compressor unloads correctly. Measured temperature is incorrect. Check sensor calibration, location and wiring. Chiller FAULT: VAC Check mains supply is stable and within allowable UNDERVOLTAGE Poor mains supply voltage. limits. displayed. Check for voltage dip on compressor start. YORK INTERNATIONAL...
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Check operation of economizer and motor cooling TEVs and liquid solenoid valve. SYS # CURR LIMITING High compressor motor current has Check if liquid temperature is within operating limits. displayed activated unloading. Check if ambient air temperature is above operating (Compressor current limits. unloading.) YORK INTERNATIONAL...
Test Point ............Microboard J11-9/3 System 1: ............Microboard J13-7/1 System 2: ............Microboard J14-7/1 Oil Pressure: System 1: ............Microboard J13-8/3 System 2: ............Microboard J14-8/3 Discharge Pressure: System 1: ............Microboard J15-8/3 System 2: ............Microboard J15-7/1 YORK INTERNATIONAL...
(18) months from date of shipment, whichever has been received by YORK. occurs first. Subject to the exclusions listed below, YORK, at its option, will repair or replace, FOB point ALL WARRANTIES AND GUARANTEES ARE VOID of shipment, such YORK products or components as it finds defective.