MODEL YVWA VARIABLE-SPEED, WATER-COOLED SCREW COMPRESSOR CHILLERS

Transcription

1 FORM EG1 (617) MODEL YVWA VARIABLE-SPEED, WATER-COOLED SCREW COMPRESSOR CHILLERS Tons kw 1 or 2 Compressors 50 and 60Hz HFC-134a

2 FORM EG1 (617) Nomenclature YVWA MB MB EVAP TUBES* BB BC BD CB CC CD DB DC DD MB MC MD ME NB NC ND NE M2 M3 M4 M5 N2 N3 N4 N5 COND TUBES* BB BC BD CB CC CD DB DC DD MB MC MD ME NB NC ND NE M2 M3 M4 M5 N2 N3 N4 N5 EE A CMPR FX=(1) 145mm GX=(1) 151 mm EE=(2) 136/136 mm FE=(2) 145/136 mm FF=(2) 145/145 mm B NOMINAL CAP PASS A=Evap: 1-pass; Cond: 1 pass B=Evap: 2-pass; Cond: 1 pass C=Evap: 3-pass; Cond: 1 pass D=Evap: 1-pass; Cond: 2 pass E=Evap: 2-pass; Cond: 2 pass F=Evap: 3-pass; Cond: 2 pass G=Evap: 1-pass; Cond: 3 pass H=Evap: 2-pass; Cond: 3 pass I =Evap: 3-pass; Cond: 3 pass STARTER A=2 CMPR Vyper Frame A B=2 CMPR Vyper Frame B C=2 CMPR Vyper Frame C D=2 CMPR Vyper Frame D J=1 CMPR Vyper Frame B L=1 CMPR Vyper Frame D R=1 CMPR Air Cooled Frame A S=1 CMPR Air Cooled Frame B T=1 CMPR Air Cooled Frame C U=1 CMPR Air Cooled Frame D *First letter represents tube size. The second letter designates the number of tubes S A MOD LEVEL X APPLICATION S=Std Water Chiller D=Dry Tower/Radiator P=Process Brine T=Ice Thermal Storage A=Heat Pump X=NO SELECTION Q=SPECIAL QUOTE UNIT TYPE YORK Variable Speed Screw Water-Cooled Chiller Design Series 2 JOHNSON CONTROLS

3 Table Of Contents FORM EG1 (617) INTRODUCTION... 5 EQUIPMENT OVERVIEW... 9 MICROCOMPUTER CONTROL CENTER ACCESSORIES AND OPTIONS UNIT COMPONENTS - FRONT VIEW UNIT COMPONENTS - BACK VIEW DIMENSIONS - UNIT DIMENSION FLOOR LAYOUT - NEOPRENE PAD DIMENSION FLOOR LAYOUT - SPRING ISOLATOR WEIGHTS ELECTRICAL DATA CONTROL WIRING POWER WIRING APPLICATION DATA GUIDE SPECIFICATIONS JOHNSON CONTROLS 3

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5 Introduction FORM EG1 (617) For over 135 years, Johnson Controls has raised the bar of chiller design and customer expectations. We are raising the bar again with a leap forward in water-cooled screw compressor chiller technology. Continuing the history of innovation in both compressor design and variable speed drive (VSD) technology, Johnson Controls proudly introduces the YORK YVWA. The YORK YVWA chillers provide superior performance. Higher efficiency heat exchangers coupled with variable speed operation and smart controls elevate the system efficiency to a whole new level. The resulting benefit from YVWA is much greater than the sum of its parts. Efficiency: Reduce your consumption YVWA chillers are Johnson Controls most efficient water-cooled screw chillers. The design includes the latest technology such as hybrid falling-film evaporators to give the customer maximum efficiency and reduced refrigerant charge compared to previous flooded evaporator designs. With up to a 30% improvement in real world efficiency versus current products, YVWA sets the new standards for lowering energy use. Flexibility: Designed for the customer The YVWA was designed with the customer in mind. YVWA chillers are capable of providing a variety of cooling and heating applications and are compatible with open- or closed-circuit cooling towers, dry air coolers, or adiabatic coolers. The YVWA s flexibility, including heat recovery and heat pump capability, makes it a perfect fit for all applications. Sustainability: Improve your environmental footprint YVWA lowers both direct and indirect impact on the environment. It uses HFC-134a refrigerant which has zero ozone depletion potential (ODP). The design minimizes the quantity of refrigerant used in the system. Every YVWA model helps LEED projects earn the Energy and Atmosphere Credit 4. HVAC systems are one of the largest consumers of electricity in commercial buildings and the largest portion of green house gasses is created by carbon dioxide generated from electric power plants. YVWA chillers reduce the electricity usage, thereby contributing to reducing greenhouse gases and helping keep the planet cool. Confidence: Proven performance provides peace of mind The YVWA design is proven by years of success with the previous generation of YORK VSD water-cooled screw chillers with thousands of machines operating in more than one hundred countries. JOHNSON CONTROLS 5

6 FORM EG1 (617) Introduction (Cont'd) YVWA is configurable to be the perfect fit for your unique needs. YVWA offers an array of options that can be tailored and tuned to match the capacity, efficiency sound and footprint for your specific application. Several variations of condenser and evaporator arrangements, alternative compressor head ratios, sound reduction kits, and controls schemes are available to meet specific requirements for your site. AHRI CERTIFICATION PROGRAM The performance of the YORK YVWA chiller has been certified to the Air Conditioning, Heating, and Refrigeration Institute (AHRI) as complying with the certification sections of the latest issue of AHRI Standards 550/590 and 551/591. Under this Certification Program, chillers are regularly tested in strict compliance with these Standards. This provides an independent, third-party verification of chiller performance. COMPUTERIZED PERFORMANCE RATINGS Each chiller is custom-matched to meet the individual building load and energy requirements. A variety of standard heat exchangers and pass arrangements are available to provide the best possible match. It is not practical to provide tabulated performance for each combination, as the energy requirements at both full and part load vary significantly with each unique component arrangement. Computerized ratings are available through each Johnson Controls sales office. Each rating can be tailored to specific job requirements, and is part of the AHRI Certification Program. OFF-DESIGN PERFORMANCE Since the vast majority of its operating hours are spent at off-design conditions, a chiller should be chosen not only to meet the full load design, but also for its ability to perform efficiently at lower loads. It is not uncommon for chillers with the same full load efficiency to have an operating cost difference of over 30% due to differences in off-design (partload) efficiencies. Part load information can be easily and accurately generated by use of the computer. And because it is so important to an owner s operating budget, this information has now been standardized within the AHRI Certification Program in the form of an Integrated Part Load Value (IPLV), and Non-Standard Part Load Value (NPLV). The current IPLV/NPLV rating from AHRI Standards 550/590 and 551/591 much more closely tracks actual chiller operation, and provides a more accurate indication of chiller performance than the previous IPLV/APLV rating. A more detailed analysis must take into account actual building load profiles, and local weather data. Part load performance data should be obtained for each job using its own design criteria. 6 JOHNSON CONTROLS

7 Introduction (Cont'd) FORM EG1 (617) Chillers conform to the following Standards and Codes: 1. AHRI 550/590 and 551/591 - Water Chilling Packages using the Vapor Compression Cycle. 2. GB/T Water Chilling (Heat Pump) Packages Using The Vapor Compression Cycle - Part 1: Water Chilling (Heat Pump) Packages For Industrial & Commercial And Similar Applications. 3. GB Safety Requirements For Water Chillers (Heat Pump) Using The Vapor Compression Cycle. 4. GB150/151 - Steel Pressure Vessels/Tubular Heat Exchangers. 5. ANSI/ASHRAE 34 - Number Designation And Safety Classification Of Refrigerants. 6. ASHRAE Energy Standard For Buildings Except Low-Rise Residential Buildings. 7. Machinery Directive (2006/42/EC) 8. EMC Directive (2004/108/EC) 9. Pressure Equipment Directive (97/23/EC) 10. Safety Code for Mechanical Refrigeration (EN 378-2) 11. Safety of machinery - Electrical Equipment of Machine (EN ) 12. Manufactured in an EN ISO 9001 accredited organization. 13. ISO 9614 Determination of sound power levels of noise sources using sound intensity. 14. Conform to CE Testing Services for construction of chillers and provide CE Listed Mark. JOHNSON CONTROLS 7

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9 Equipment Overview FORM EG1 (617) SEMI-HERMETIC YORK SCREW COMPRESSORS The direct-drive, semi-hermetic rotary screw compressor incorporates advanced technology in a rugged design. The continuous function, microprocessor controlled VSD provides smooth capacity control from 100% down to 12.5% of chiller capacity (the selection program can advise minimum turndown for the specific selection at specific conditions). State-of-the-art screw compressor design and manufacturing ensures optimal efficiencies at all chiller load points. With no unloading steps or slide valves in the compressor, the YVWA variable speed driven compressor has 50% fewer moving parts than fixed speed compressors with slide valves. The YVWA compressor is one of the most efficient and reliable screw compressors in the industry. EVAPORATOR The evaporator is a shell and tube, hybrid falling film type heat exchanger. It contains a balance of flooded and falling film technology to optimize efficiency, minimize refrigerant charge, and maintain reliable control. A specifically designed distribution system provides uniform refrigerant flow for optimum performance. CONDENSER The condenser is a shell and tube type, with a discharge gas baffle to prevent direct high velocity impingement on the tubes. The baffle is also used to distribute the refrigerant gas flow properly for the most efficient heat transfer. An integral sub-cooler is located at the bottom of the condenser shell providing highly effective liquid refrigerant subcooling to provide the highest cycle efficiency. REFRIGERANT CIRCUIT The YVWA has one independent refrigerant circuit per compressor. An electronic expansion valve (EEV), controlled by the unit panel, accommodates varying head and load conditions. The condenser shell is capable of storing the entire system refrigerant charge during servicing. Optional service valves are available to facilitate the removal of refrigerant. The sub-cooling economizer (plate heat exchanger type), controlled by the unit panel, meters some refrigerant gas to the compressor to reduce energy consumption. COMPLETE FACTORY PACKAGE Each unit is shipped as a complete factory package, completely assembled with all interconnecting refrigerant piping and internal wiring and ready for field installation. Prior to shipment, each individual chiller undergoes an extensive testing procedure, ensuring workmanship is the highest quality and that the initial start-up is trouble-free. Before leaving the factory, each refrigerant circuit is factory pressure tested, evacuated and then fully charged with HFC-134a refrigerant and oil. An operational test is performed with water flowing through the evaporator and condenser to ensure each circuit functions correctly. JOHNSON CONTROLS 9

10 FORM EG1 (617) Equipment Overview (Cont'd) ELECTRICAL All controls and motor starting equipment necessary for unit operation are factory wired and function tested. There are no surprises at start-up; the unit will start up right the first time and every time. The standard unit is equipped with circuit breaker for electrical connections. The chillers come with a single point power connection and are supplied with a factory mounted and wired control transformer that powers all unit controls from the main unit power supply. The transformer utilizes scheduled line voltage on the primary side and provides 115V/1Ø on secondary. All exposed power wiring is routed through liquid-tight, UV-stabilized, non-metallic conduit. VSD Power/Control Panel includes main power connection(s), VSD contactors, current overloads, and factory wiring. All display and control features can be accessed through the keypad and control display access door, eliminating the need to open the main cabinet doors. BUILDING AUTOMATION SYSTEM CAPABILITIES The E-Link Gateway provides an economical and versatile connection between Johnson Controls equipment and open/standard protocols. It efficiently manages the communication protocols currently used by Johnson Controls equipment, exposing the data in a consistent, organized, and defined fashion. A simple switch selection allows configuration of the required equipment profile and output protocol, which reduces equipment connectivity startup time. 10 JOHNSON CONTROLS

11 MicroComputer Control Center FORM EG1 (617) Figure 1 - VIEW OF CONTROL CENTER KEYPAD AND DISPLAY The microcomputer control center provides automatic control of chiller operation including compressor start/stop and load/unload anti-recycle timers, chilled liquid pump, unit alarm contacts and run signal contacts. The microcomputer control center comes online as soon as the main power switch on the unit is switched on; immediately, the microcomputer control center will begin to continuously monitor all variables. The microprocessor controls the unit s capacity by matching the actual leaving chilled liquid temperature (LCHLT) to the user-defined setpoint. Factors that may cause the system s actual LCHLT to fluctuate are changes in load, and chilled liquid loop flow rate and volume. The controls system logic monitors the rate at which the LCHLT is approaching the setpoint to ramp up or down compressor capacity as required. The variable frequency drive allows the compressor capacity to match the load. Display Data Leaving Chilled Liquid Temperature Returning Liquid Temperature Lead System (if applicable) Compressor Capacity (% of Full Load Amps) VSD Output Frequency / Compressor Speed Compressor Run Hours Compressor Number of Starts Oil Pressure History Data for Last Twenty Normal Shutdowns History Data for Last Ten Shutdown Faults JOHNSON CONTROLS 11

12 FORM EG1 (617) MicroComputer Control Center (Cont'd) Programmable Setpoints Display Language Chilled Liquid Cooling Mode Local or Remote Control Display Unit Remote Temperature Reset Remote Current Limit Leaving Chilled Liquid Setpoint and Range Maximum Remote Temperature Reset Leaving Condenser Liquid Setpoint and Range (Heat Pump Mode Only) Johnson Controls systems or another vendor s systems can incorporate these setpoints and data outputs to give the customer a complete understanding of how the system is running through a Building Automation System. Extreme Conditions - During extreme or unusual conditions the chiller control system will avoid shut-down by varying capacity. By monitoring motor current and suction and discharge pressures, the chiller can maintain maximum available cooling output without shutting down. Unit Safeties are provided for the chiller to perform auto-reset shut down for the following conditions: Out of range leaving chilled liquid temperature Under voltage Flow switch operation 12 JOHNSON CONTROLS

13 Accessories and Options FORM EG1 (617) All options factory mounted unless otherwise noted. SOUND ATTENUATION The standard chiller configuration is equipped with acoustic treatments on the refrigerant lines, compressors, and oil separators. There are several sound attenuation options available to further reduce sound at its source thereby meeting local sound level regulations. HEAT EXCHANGER OPTIONS FACTORY INSULATION OF EVAPORATOR Factory-applied thermal insulation of the flexible, closed-cell plastic type, 3/4 (19mm) thick is attached with vapor-proof cement to the evaporator shell, flow chamber, evaporator tube sheets, suction connection, water boxes and nozzles, and (as necessary) to the auxiliary tubing. Insulation can also be provided on the condenser if desired to meet specific application needs, such as heat recovery or heat pump duty. This insulation will normally prevent condensation in environments with relative humidity up to 75% and dry bulb temperatures ranging from 50 to 90 F (10 to 32 C). 1-1/2 (38mm) thick insulation is also available for relative humidity up to 90% and dry bulb temperatures ranging from 50 to 90 F (10 to 32 C). DOUBLE THICK INSULATION Double Thick (1-1/2 ) insulation provided on the evaporator if desired, for specific applications, such as glycol chilling. FLANGE KIT Provides contractor with the couplings best suited to tie into the chilled liquid piping; option can be selected separately for the evaporator and condenser. Options include: HG 150 psig (10.3 barg) raised-face weldable flanges, for applications where field coupling has existing flanges. Flanges are field-welded by contractor. Also available in 300 psig (20.6 barg) HG 150 psig (10.3 barg) raised-face flanges with couplings, for applications where field coupling has existing flanges. Flanges are field-mounted by contractor. Also available in 300 psig (20.6 barg). NOZZLE OPTIONS/LIQUID OPTIONS Two- and three-pass nozzle arrangements available only in pairs shown and for all shell codes. Any pair of condenser nozzles may be used in combination with any pair of evaporator nozzles. THREE-PASS EVAPORATOR The standard evaporator is constructed with two chilled liquid passes through the evaporator. The three-pass option is recommended for use in brine applications or where a greater liquid temperature difference is required without sacrificing efficiency. ONE- OR THREE-PASS CONDENSER The standard condenser is constructed with two liquid passes through the condenser. The one-pass option is recommended for use in series counter-flow applications; the three-pass option is recommended for use in heat pump applications where high temperature differences are required. The one- or threepass options allow for customized cooling applications without the sacrifice of efficiency. JOHNSON CONTROLS 13

14 FORM EG1 (617) Accessories and Options (Cont'd) NOZZLE OPTIONS/LIQUID OPTIONS Two- and three-pass nozzle arrangements available only in pairs shown and for all shell codes. Any pair of condenser nozzles may be used in combination with any pair of evaporator nozzles. CONTROLS OPTIONS BUILDING AUTOMATION SYSTEM INTERFACE (TEMPERATURE) Factory installed option to accept a 4 to 20 ma or a 0 to 10 VDC input to allow remote reset of the Leaving Chilled Liquid Temperature Setpoint. The setpoint can be positively offset upwards up to 40 F (22.2 C). This option is useful for ice storage or process applications or for periods where higher chilled liquid temperatures are adequate for low loads. Available alone or in combination with BAS Load Limit. BUILDING AUTOMATION SYSTEM INTERFACE (LOAD LIMIT) Factory installed option to accept a 4 to 20 ma or a 0 to 10 VDC input to allow remote reset of the Load Limit Setpoint. The setpoint can limit system demand from %. Available alone or in combination with BAS Temperature Reset. E-Link The E-Link Gateway provides full communication to Building Automation Systems, including BACnet (MS/ TP), Modbus, LON and N2. THERMAL STORAGE Provides special control logic and modifications to produce leaving chilled brine temperatures below 40 F (4.4 C) primarily at times of low cooling load (night time). Option can be used to produce ice to supplement cooling and significantly decrease energy costs. The capability of the chiller is enhanced by using both ice and chilled liquid simultaneously during times of peak cooling needs. GENERAL OPTIONS FLOW SWITCH ACCESSORY Vapor proof SPDT, NEMA 3R switch, 150 psig (10.3 barg) DWP, -20 F to 250 F (-29 C to 121 C) with 1 NPT (IPS) connection for upright mounting in horizontal pipe (This flow switch or equivalent must be furnished with each unit for chilled liquid loop.). A condenser liquid flow switch is optional. (Field mounted) DIFFERENTIAL PRESSURE SWITCH This 3-45 psig (0.2-3 barg) range switch, with 1/4 NPTE pressure connections, is an alternative to the paddle-type flow switch. (Field mounted) THERMAL TYPE FLOW SWITCH Solid state flow sensor with internal heating element, is an alternative to the paddle-type flow switch. This switch uses the thermal effect of the flowing fluid to sense when an adequate flow rate has been established. The sealed sensor probe is 316 stainless steel, which is suited to very high working pressures. (Factory installed). REFRIGERANT ISOLATION VALVES For standard water chiller applications, optional factory-installed isolation valves in the compressor discharge line and refrigerant liquid line per circuit are available. This allows isolation and storage of the refrigerant charge in the chiller condenser during servicing, eliminating time-consuming transfers to remote storage vessels. Both valves in each of the independent refrigerant circuits are positive shut-off, assuring integrity of the storage system. DUAL PRESSURE RELIEF VALVE For ASME shells, two safety relief valves are mounted in parallel; one is always operational to assist in valve replacement during maintenance. PRESSURE VESSEL OPTIONS The evaporator and condenser can be provided with either ASME or PED pressure vessel codes certification. 14 JOHNSON CONTROLS

15 Accessories and Options (Cont'd) FORM EG1 (617) CIRCUIT BREAKER A unit-mounted circuit breaker with external lockable handle will be supplied to isolate the single point power voltage for servicing. The circuit breaker is sized to provide motor branch circuit protection, short circuit protection and ground fault protection for the motor branch-circuit conductors, the motor control apparatus and the motors. SPECIAL REQUIREMENT DOCUMENTS There are two options to select from: Special Requirement Document Package (SRDP) includes Pressure Vessel Report, Unit Run Test Report, Production System Check Sheet and Final Unit Inspection Check Sheet. Factory Witness Run Test includes customer witness of chiller end-of-line run test in addition to the SRDP. Package includes steel mill material reports for vessels in addition to the SRDP. VIBRATION ISOLATION ELASTOMERIC ISOLATION This option is recommended for normal installations. It provides very good performance in most applications for the least cost. Field mounted. 1 SPRING ISOLATORS Spring and cage type isolators for mounting under the unit base rails are available to support unit. They are level adjustable. 1 nominal deflection may vary slightly by application. (Field mounted) JOHNSON CONTROLS 15

16 FORM EG1 (617) Unit Components - Front View SINGLE COMPRESSOR 2 DUAL COMPRESSOR ITEM NUMBER DESCRIPTION 1 Control Center 2 Oil Separator 3 Evaporator 4 Compact Waterbox 5 Sight Glass 6 Condenser 7 Circuit Breaker 8 Liquid Nozzles 9 Variable Speed Drive 16 JOHNSON CONTROLS

17 Unit Components - Back View FORM EG1 (617) SINGLE COMPRESSOR 8 DUAL COMPRESSOR ITEM NUMBER DESCRIPTION 1 Compressor 2 Compact Waterbox 3 Evaporator 4 Liquid Level Sensor 5 Condenser 6 Liquid Line 7 Sight Glass 8 Muffler JOHNSON CONTROLS 17

18 FORM EG1 (617) Dimensions - Unit TOP VIEW - SINGLE COMPRESSOR SIDE VIEW - BOTH N B TOP VIEW - DUAL COMPRESSOR M P F D C E G M N FRONT VIEW - SINGLE COMPRESSOR I K H FRONT VIEW - DUAL COMPRESSOR A J I K H A J 18 JOHNSON CONTROLS

19 Dimensions - Unit (Cont'd) FORM EG1 (617) DIMENSIONS A B C D E F G M N EVAPORATOR AND CONDENSER SHELL CODES IN (MM) SINGLE 145/151 DUAL 136/145 B-B C-C D-D M-M N-N 8ˊ 10ˊ 12ˊ 12' 14' (2438) (3048) (3658) (3658) (4268) 6ˊ-11/16 6ˊ-11/16 6ˊ-11/16 6'-3/4" 6'-3/4" (1846) (1846) (1846) (1844) (1844) 4ˊ-7 5/8 4ˊ-7 5/8 4ˊ-7 5/8 4'-7-5/16" 4'-7-5/16" (1413) (1413) (1413) (1405) (1405) 2ˊ-2 15/16 2ˊ-2 15/16 2ˊ-2 15/16 2'-2-7/8" 2'-2-7/8" (684) (684) (684) (683) (683) 2ˊ-4 11/16 2ˊ-4 11/16 2ˊ-4 11/16 2'-4-3/8" 2'-4-3/8" (729) (729) (729) (722) (722) 1ˊ-1 15/32 1ˊ-1 15/32 1ˊ-1 15/32 1'-1-3/8" 1'-1-3/8" (342) (342) (342) (342) (342) 1ˊ-2 11/32 1ˊ-2 11/32 1ˊ-2 11/32 1'-2-3/16" 1'-2-3/16" (365) (365) (365) (361) (361) 6 21/32 1ˊ-6 21/32 2ˊ-6 21/32 4-3/4" 10-3/4" (169) (474) (779) (123) (275) 1ˊ-2 17/32 (369) 2ˊ-2 17/32 (674) 3ˊ-2 17/32 (979) 5'-6" (1678) 6' (1830) WATER BOX DIMENSIONS IN (MM) DIM. EVAPORATORS B & C & D EVAPORATORS M, N CONDENSER B & C & D CONDENSERS M, N 1 PASS 2 PASS 3 PASS 2-PASS 3-PASS 1 PASS 2 PASS 3 PASS 1-PASS 2-PASS 3-PASS H 1ˊ 1 17/32 1ˊ 1 17/32 1ˊ 1 17/ /2 14-1/2 14-1/2 (344) (344) (344) (369) (369) (369) I DIM. 1ˊ 2 3/8 (369) 1ˊ 2 3/8 (369) 1ˊ 2 3/8 (369) REAR HEAD 2 PASS J K 7 21/32 (195) 16-3/32 (409) 16-3/32 (409) REAR HEAD 2-PASS 6-5/32 (156) REAR HEAD 2 PASS 6 29/32 (176) REAR HEAD 2-PASS 5-3/4 (146) ADDITIONAL OPERATING HEIGHT IN (MM) CLEARANCE TO FLOOR P TYPE OF CHILLER MOUNTING NEOPRENE PAD ISOLATORS 1-3/4 (44.5) SPRING ISOLATORS 1 DEFLECTION 1 (25.4) DIRECT MOUNT 3/4 (19.1) NOTES: 1. All dimensions are approximate. Certified dimensions are available on request 2. Evaporator and condenser water nozzles can be located on either end of unit. 3. Standard 150 PSI (10.3 barg) design pressure boxes shown. 4. To determine overall height, add dimension P for the appropriate isolator type. 5. Front of unit is defined as side of chiller where control center is mounted. 6. In order to achieve rated performance, condenser liquid must enter the water box through the bottom connection for proper operation of the sub-cooler. 7. Connected piping should allow for the removal of the compact water boxes for tube access and cleaning. JOHNSON CONTROLS 19

20 FORM EG1 (617) Dimensions - Evaporators (Cont'd) EVAPORATORS COMPACT WATER BOXES (STANDARD) 1-PASS LD22631 NOTES: 1. All dimensions are approximate. Certified dimensions are available on request. 2. Standard water nozzles are furnished with HG welded flanges. Factory-installed class 150 (HG/T20615, round slip-on forged carbon steel with 2mm raised face) water flanged nozzles are optional. Companion flanges, nuts, bolts, and gaskets are not furnished. 3. Evaporator and condenser water nozzles can be located on either end of the unit. 4. Standard 150 PSI (10.3 barg) design pressure boxes shown. 5. In order to achieve the rated performance, condenser liquid must enter the water box through the bottom connection for proper operation of the sub-cooler. 6. Connected piping should allow for the removal of the compact water boxes for tube access and cleaning. 20 JOHNSON CONTROLS

21 Dimensions - Evaporators (Cont'd) FORM EG1 (617) NUMBER OF PASSES 1 1-PASS NOZZLE ARRANGEMENTS IN A H EVAPORATOR OUT NOTE: Liquid must enter through lower connection to achieve rated performance. NUMBER OF PASSES 2 2-PASS NOZZLE ARRANGEMENTS IN C K EVAPORATOR H A OUT NOTE: Liquid must enter through lower connection to achieve rated performance. NUMBER OF PASSES 3 3-PASS NOZZLE ARRANGEMENTS IN G P EVAPORATOR B J OUT NOTE: Liquid must enter through lower connection to achieve rated performance. ADDITIONAL OPERATING HEIGHT IN (MM) CLEARANCE TO FLOOR TYPE OF CHILLER MOUNTING Neoprene Pad Isolators 1-3/4 (44.5) Spring Isolators 1 Deflection 1 (25.4) Direct Mount 3/4 (19.1) N F P NOZZLE EVAPORATOR PIPE SIZE NOZZLE DIMENSIONS FT - IN (MM) EVAPORATOR NO. OF SHELL CODE 1-PASS 2-PASS 3-PASS PASSES CC GG BB DD GG BB DD GG B,C,D '-10-19/32" 1'-2-11/32" 2'-4-27/32" 3'-4-9/32" 1'-2-11/32" 2'-4-27/32" 3'-4-9/32" 1'-2-11/32" (878) (365) (733) (1023) (365) (-733) (1023) (365) 2-6" 3-7" 1-2-7/32" 2-6" 3-7" 1-2-7/32" M, N (763) (1093) (361) (763) (1093) (361) JOHNSON CONTROLS 21

22 FORM EG1 (617) Dimensions - Condensers (Cont'd) CONDENSERS COMPACT WATER BOXES (STANDARD) NOTES: 1. All dimensions are approximate. Certified dimensions are available on request. 2. Standard water nozzles are furnished with HG welded flanges. Factory-installed class 150 (HG/T20615, round slip-on forged carbon steel with 2mm raised face) water flanged nozzles are optional. Companion flanges, nuts, bolts, and gaskets are not furnished. 3. Evaporator and condenser water nozzles can be located on either end of the unit. 4. Standard 150 PSI (10.3 barg) design pressure boxes shown. 5. In order to achieve the rated performance, condenser liquid must enter the water box through the bottom connection for proper operation of the sub-cooler. 6. Connected piping should allow for the removal of the compact water boxes for tube access and cleaning. 22 JOHNSON CONTROLS

23 Dimensions - Condensers (Cont'd) FORM EG1 (617) NUMBER OF PASSES 1 1-PASS NOZZLE ARRANGEMENTS IN A H CONDENSER OUT H A NUMBER OF PASSES 2 2-PASS NOZZLE ARRANGEMENTS IN C K CONDENSER OUT NOTE: Liquid must enter through lower connection to achieve rated performance. B J NUMBER OF PASSES 3 3-PASS NOZZLE ARRANGEMENTS IN G P CONDENSER OUT NOTE: Liquid must enter through lower connection to achieve rated performance. N F ADDITIONAL OPERATING HEIGHT IN (MM) CLEARANCE TO FLOOR P TYPE OF CHILLER MOUNTING Neoprene Pad Isolators 1-3/4 (44.5) Spring Isolators 1 Deflection 1 (25.4) Direct Mount 3/4 (19.1) CONDENSER SHELL CODE NOZZLE PIPE SIZE CONDENSER NOZZLE DIMENSIONS FT - IN (MM) NO.OF PASSES 1-PASS 2-PASS 3-PASS B,C,D CC GG BB DD GG BB DD GG M, N '-2-13/32" (366) 1-2-3/4 (375) 1'-1-15/32" (366) 1-1-7/16 (342) 8-11/16" (366) 8-3/32 (210) 1'-8-1/8" (366) 1-9-1/4 (540) 1'-1-11/32" (366) 1-1-7/16 (342) 8-11/16" (366) 8-3/32 (210) 1'-8-1/8" (366) 1-9-1/4 (540) 1'-1-11/32" (366) 1-1-7/16 (342) JOHNSON CONTROLS 23

24 FORM EG1 (617) Dimension Floor Layout - Neoprene Pad SINGLE COMPRESSOR UNIT 3 (76) 8 (203) 1 (26) 1 (26) END SHEET 1 (25.4) CONDENSER CENTERLINE EVAPORATOR CENTERLINE SUPPORT FOOT 28-7/16 (729) 55-5/8 (1413) END SHEET 6 (152) 1-1/4 (32) A 1-1/4 (32) ISOLATOR DETAIL (N.T.S.) 5-1/2 (140) 4-1/2 (114) NOTES: 1. Dimensions are typical for all four pads. 2. Dimensions are in inches (MM). 3. Isolator to be centered under support foot. 4-1/2 (114) 5-1/2 (140) STEEL PLATE 3/8 (10) RUBBER PAD 3/4 (25) DIMENSIONS HEAT EXCHANGER SHELL CODES FT (MM) SINGLE 145/ A 8 (2438) 10 (3048) 12 (3658) 24 JOHNSON CONTROLS

25 Dimension Floor Layout - Neoprene Pad (Cont'd) DUAL COMPRESSOR UNIT FORM EG1 (617) 3 (76) 8 (203) (32) 1-1/4 (32) 1-1/4 (32) END SHEET CONDENSER CENTERLINE SHELLS CENTERLINE END SHEET 55-5/16 (1406) 1 (25) EVAPORATOR CENTERLINE SUPPORT FOOT 28-7/16 (722) 6 (152) 1-1/4 (32) A 1-1/4 (32) ISOLATOR DETAIL 5-1/2 (140) 4-1/2 (114) NOTES: 1. Dimensions are typical for all eight pads. 2. Dimensions are in inches (MM). 3. Isolator to be centered under support foot. (114) (140) 4-1/2 5-1/2 STEEL PLATE 3/8 (10) RUBBER PAD 3/4 (19) DIMENSIONS HEAT EXCHANGER SHELL CODES FT (MM) DUAL 136/ A 8 (2438) 10 (3048) 12 (3658) JOHNSON CONTROLS 25

26 FORM EG1 (617) Dimension Floor Layout - Spring Isolator SINGLE COMPRESSOR UNIT 1/2 (13) 1/2 (13) 7-3/4 (197) END SHEET 4 (103) 1 (26) 2 (51) 2 (51) 4 (102) 7-11/16 (196) 3-7/8 (98) 3-1/8 (79) 1-1/4 (32) CONDENSER CENTERLINE EVAPORATOR CENTERLINE A 2-4-7/16 (729) 1-1/4 (32) 4-7-5/16 (1413) END SHEET NOTES: 1. Dimensions are typical for all four pads. 2. Dimensions are in inches (MM). 3. Isolator to be centered under support foot. END SHEET 1/2 (13) 1 (25) SHELL 3/8 (9) 7 (178) 7 (178) CAP SCREW ADJUSTING BOLT DIMENSIONS HEAT EXCHANGER SHELL CODES(MM) SINGLE 145/ A 8 (2438) 10 (3048) 12 (3658) 26 JOHNSON CONTROLS

27 Dimension Floor Layout - Spring Isolator (Cont'd) DUAL COMPRESSOR UNIT FORM EG1 (617) 4 (102) 1/2 (13) 1/2 (13) 7-3/4 (197) 1-1/4 (32) 1 (26) 1-1/4 (32) 4 (102) END SHEET 7-11/16 (196) CONDENSER CENTERLINE SHELLS CENTERLINE END SHEET 4-7-5/16 (1413) 2 (51) 3-7/8 (98) EVAPORATOR CENTERLINE 2-4-7/16 (729) 2 (51) 1-1/4 (32) 3-1/8 (79) A 1-1/4 (32) NOTES: 1. Dimensions are typical for all eight pads. 2. Dimensions are in inches (MM). 3. Isolator to be centered under support foot. END SHEET SHELL 1 (25) 1/2 (13) 3/8 (9) 7 (178) 7 (178) CAP SCREW ADJUSTING BOLT HEAT EXCHANGER SHELL CODES(MM) DIMENSIONS DUAL 136/ A 8 (2438) 10 (3048) 12 (3658) JOHNSON CONTROLS 27

28 FORM EG1 (617) Weights COMPR. SHELLS SINGLE DUAL FX GX EE FE FF SHIPPING WEIGHT RANGE MIN - MAX APPROXIMATE UNIT WEIGHT OPERATING WEIGHT RANGE MIN - MAX REFRIGERANT CHARGE RANGE MIN - MAX LOADING PER ISOLATOR MIN - MAX LBS KG LBS KG LBS KG LBS KG B-B C-C D-D B-B C-C D-D M-M 10,541-11,693 4,782-5,304 11,497-12,950 5,215-5, ,875-3,279 1,304-1,469 N-N 12,180-12,450 5,525-5,647 13,251-13,880 6,011-6, ,314-3,370 1,503-1,574 M-M 10,610-11,762 4,813-5,335 11,566-13,019 5,246-5, ,892-3,254 1,312-1,476 N-N 12,248-12,519 5,556-5,678 13,319-13,948 6,042-6, ,329-3,428 1,510-1,582 M-M 10,678-11,830 4,844-5,366 11,634-13,087 5,277-5, ,908-3,272 1,319-1,484 N-N 12,317-12,587 5,587-5,709 13,388-14,017 6,073-6, ,347-3,503 1,518-1,589 NOTE: Weights shown for base unit; selected options and tube count variations may add weights and/or refrigerant charge quantity to unit. Contact your nearest Johnson Controls Sales Office for weight data. 28 JOHNSON CONTROLS

29 Electrical Data FORM EG1 (617) WATER COOLED VSD FRAME A B C D FIELD WIRING LUGS INPUT VOLTS INPUT FREQ LUG/ PHASE LUG SIZES WIRES PER LUG SINGLE CIRCUIT CIRCUIT BREAKER LUG WIRE RANGE UL & CE LUG WIRE RANGE GB #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #2/0 AWG-500KCMIL #3/0 AWG-500KCMIL #2/0 AWG-500KCMIL #3/0 AWG-500KCMIL #2/0 AWG-500KCMIL #3/0 AWG-500KCMIL #2/0 AWG-500KCMIL NOTES: 1. The 50Hz and 60Hz drives will use the same circuit breaker. 2. The D frame size uses the Eaton L series circuit breaker which comes with the 400kcmil~500kcmil lugs. We put another set of 3/0 AWG -350kcmil lugs in the VSD. FIELD WIRING LUGS AIR COOLED VSD FRAME INPUT VOLTS INPUT FREQ LUG/ PHASE LUG SIZES CIRCUIT BREAKER WIRES PER LUG LUG WIRE RANGE UL & CE SINGLE CIRCUIT LUG/ PHASE DISCONNECT SWITCH WIRES PER LUG LUG WIRE RANGE UL & CE A 400/460 50/ #2/0AWG-500KCMIL 1 1 #2AWG-600KCMIL B 400/460 50/ #2/0AWG-500KCMIL 1 1 #2AWG-600KCMIL C 400/460 50/ #2/0AWG-500KCMIL 1 2 #2AWG-600KCMIL D 400/460 50/ #2/0AWG-500KCMIL 1 2 #2AWG-600KCMIL NOTES: 1. The 50Hz and 60Hz control panel will use the same circuit breaker or disconnect switch. 2. Control circuit has different control transformer for 400V and 460V main power. 3. Customer shall select suitable wire size according to maximum current capacity of the unit and lug type. JOHNSON CONTROLS 29

30 FORM EG1 (617) Electrical Data (Cont'd) FIELD WIRING LUGS VSD INPUT INPUT LUG/ FRAME VOLTS FREQ PHASE A B C D TERMINAL BLOCK WIRES PER LUG LUG WIRE RANGE WIRES LUG/ PER PHASE LUG CIRCUIT BREAKER LUG WIRE RANGE NON-FUSED DISCONNECT SWITCH WIRES LUG/ LUG WIRE PER PHASE RANGE LUG #2 AWG-600kcmil 1 2 #2/0AWG-400KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #2/0AWG-400KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #2/0AWG-400KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #2/0AWG-400KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #2/0AWG-500KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #1/0AWG-500KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #1/0AWG-500KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #1/0AWG-500KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #1/0AWG-500KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 2 #1/0AWG-500KCMIL 1 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 3 #3/0AWG-400KCMIL 2 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 3 #3/0AWG-400KCMIL 2 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 3 #3/0AWG-400KCMIL 2 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 3 #3/0AWG-400KCMIL 2 2 #2 AWG-600kcmil N/A N/A N/A N/A N/A N/A N/A N/A N/A #2 AWG-600kcmil 1 4 #4/0AWG-500KCMIL 2 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 4 #4/0AWG-500KCMIL 2 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 4 #4/0AWG-500KCMIL 2 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 4 #4/0AWG-500KCMIL 2 2 #2 AWG-600kcmil #2 AWG-600kcmil 1 3 #3/0AWG-400KCMIL 2 2 #2 AWG-600kcmil VOLTAGE CODE -40 = = = = = JOHNSON CONTROLS

31 Control Wiring FORM EG1 (617) SINGLE COMPRESSOR UNITS LD21951 JOHNSON CONTROLS 31

32 FORM EG1 (617) Control Wiring (Cont'd) DUAL COMPRESSOR UNITS LD JOHNSON CONTROLS

33 Power Wiring FORM EG1 (617) POWER WIRING SINGLE CIRCUIT LD21953 JOHNSON CONTROLS 33

34 FORM EG1 (617) Power Wiring (Cont'd) POWER WIRING DUAL CIRCUIT LD JOHNSON CONTROLS

35 Application Data FORM EG1 (617) The following discussion is a user s guide in the application and installation of YVWA chillers to ensure the reliable, trouble-free life for which this equipment was designed. While this guide is directed towards normal, liquid-chilling applications, a Johnson Controls sales engineer can provide complete recommendations on other types of applications. LOCATION YVWA chillers are virtually vibration free and may generally be located at any level in a building where the construction will support the total system operating weight. The unit site must be a floor, mounting pad or foundation which is level within 1/4 (6.4 mm) and capable of sup-porting the operating weight of the unit. Sufficient clearance to permit normal service and maintenance work should be provided all around and above the unit. Additional space should be provided at one end of the unit to permit cleaning of evaporator and condenser tubes as required. A doorway or other properly located opening may be used. The chiller should be installed in an indoor location where temperatures range from 40 F to 110 F (4.4 C to 43.3 C). The dew point temperature in the equipment room must be below the entering condenser liquid temperature to prevent condensing liquid vapor inside of the low voltage VSD. Applications using cooling sources other than evaporative or closed loop air exchange methods need to request a factory-supplied temperature control valve to prevent condensation inside the VSD. Other areas susceptible to liquid vapor condensate are outside of the condenser shell and condenser water boxes. Example applications include cooling condenser liquid using chilled liquid, wells, river or other low temperature fluids. For outdoor applications, please contact your nearest Johnson Controls Sales Office. LIQUID CIRCUITS Flow Rate Variable flow in the condenser is not recommended, as it generally raises the energy consumption of the system by keeping the condenser pressure high in the chiller. Additionally, the rate of fouling in the condenser will increase at lower liquid velocities associated with variable flow, raising system maintenance costs. Refer to Table 1 & 2 (pgs. 28 and 29) for flow limits at design conditions. There is increasing interest to use variable primary flow (VPF) systems in large chilled liquid plants. VPF systems can offer lower installation and operating costs in many cases, but do require more sophisticated control and flow monitoring. YVWA chillers will operate successfully in VPF systems. With a minimum allowable evaporator tube velocity of 1.5 ft/sec. (0.5 m/s) for standard tubes at part-load rating conditions, YVWA chillers will accommodate the wide variation in flow required by many chilled liquid VPF applications. The chillers can tolerate a 50% flow rate change in one minute that is typically associated with the staging on or off of an additional chiller; however a lower flow rate change is normally used for better system stability and set point control. Proper sequencing via the building automation system will make this a very smooth transition. JOHNSON CONTROLS 35

36 FORM EG1 (617) Application Data (Cont'd) Temperature Ranges For normal liquid chilling duty, leaving chilled liquid temperatures may be selected between 38 F and 60 F (3.3 C and 15.6 C). Condenser Water Units are equipped with a unit mounted and factory wired flow detection sensors. The chiller is engineered for maximum efficiency at both design and partload operation by taking advantage of the colder cooling tower water temperatures which naturally occur during the winter months. Appreciable power savings are realized from these reduced heads. The minimum entering condenser water temperature for other full and part-load conditions is provided by the following equation: Standard Head Compressor Min ECWT = 0.75*LCHWT + 33 full load condenser water ΔT*0.95*% Load (temperatures in F) Min ECWT = 0.75*LCHWT full load condenser water ΔT*0.95*% Load (temperatures in C) High Head Compressor Min ECWT = 0.72*LCHWT + 39 full load condenser water ΔT*0.98*% Load (temperatures in F) Min ECWT = 0.72*LCHWT full load condenser water ΔT*0.98*% Load (temperatures in C) NOTE: The min ECWT limitation is 18 C (64.4 F), if the results of the equations above are lower than 18 C, pls use 18 C as the minimum value. Liquid Quality The practical and economical application of liquid chillers requires that the quality of the liquid supply for the condenser and evaporator be analyzed by a liquid treatment specialist. Liquid quality may affect the performance of any chiller through corrosion, deposition of heat-resistant scale, sedimentation or organic growth. These will degrade chiller performance and increase operating and maintenance costs. Normally, performance may be maintained by corrective liquid treatment and periodic cleaning of tubes. If liquid conditions exist which cannot be corrected by proper liquid treatment, it may be necessary to provide a larger allowance for fouling, and/ or to specify special materials of construction. General Piping All chilled liquid and condenser liquid piping should be designed and installed in accordance with accepted piping practice. Chilled liquid and condenser liquid pumps should be located to discharge through the chiller to assure positive pressure and flow through the unit. Piping should include offsets to provide flexibility and should be arranged to prevent drainage of liquid from the evaporator and condenser when the pumps are shut off. Piping should be adequately supported and braced independently of the chiller to avoid the imposition of strain on chiller components. Hangers must allow for alignment of the pipe. Isolators in the piping and in the hangers are highly desirable in achieving sound and vibration control. Convenience Considerations To facilitate the performance of routine maintenance work, some or all of the following steps may be taken by the purchaser. Evaporator and condenser water boxes are equipped with plugged vent and drain connections. If desired, vent and drain valves may be installed with or without piping to an open drain. Pressure gauges with stop-cocks and stop-valves may be installed in the inlets and outlets of the condenser and chilled liquid line as close as possible to the chiller. An overhead monorail or beam may be used to facilitate servicing. 36 JOHNSON CONTROLS

37 Application Data (Cont'd) FORM EG1 (617) Connections The standard chiller is designed for 150 psig (10.3 barg) design working pressure in both the chilled liquid and condenser liquid circuits. The connections (liquid nozzles) to these circuits are furnished with HG raised-face welded flanges grooves for grooved and shouldered joints. Piping should be arranged for ease of disassembly at the unit for tube cleaning. All liquid piping should be thoroughly cleaned of all dirt and debris before final connections are made to the chiller. Chilled Liquid A liquid strainer of maximum 1/8 (3.2 mm) perforated holes must be field-installed in the chilled liquid inlet line as close as possible to the chiller. If located close enough to the chiller, the chilled liquid pump may be protected by the same strainer. The strainer is important to protect the chiller from debris or objects which could block flow through individual heat exchanger tubes. A reduction in flow through tubes could seriously impair the chiller performance or even result in tube freeze-up. A paddle -type flow switch is field installed in the evaporator nozzle and connected to the panel, which assures adequate chilled liquid flow during operation. Condenser Liquid The chiller is engineered for maxi-mum efficiency at both design and part-load operation by taking advantage of the colder cooling tower liquid temperatures which naturally occur during the winter months. Appreciable power savings are realized from these reduced heads. At initial startup, entering condensing liquid temperature may be as much as 25 F (13.9 C) colder than the standby chilled liquid temperature. MULTIPLE UNITS Selection Many applications require multiple units to meet the total capacity requirements as well as to provide flexibility and some degree of protection against equipment shutdown. There are several common unit arrangements for this type of application. The YVWA chiller has been designed to be readily adapted to the requirements of these various arrangements. Parallel Arrangement (Refer to Figure 2 on page 41) Chillers may be applied in multiples with chilled and condenser liquid circuits connected in parallel between the units. Figure 1 on page 11 represents a parallel arrangement with two chillers. Parallel chiller arrangements may consist of equally or unequally sized units. When multiple units are in operation, they will load and unload at equal percentages of design full load for the chiller. Depending on the number of units and operating characteristics of the units, loading and unloading schemes should be designed to optimize the overall efficiency of the chiller plant. It is recommended to use an evaporator bypass piping arrangement to bypass fluid around evaporator of any unit which has cycled off at reduced load conditions. It is also recommended to alternate the chiller cycling order to equalize chiller starts and run hours. Series Arrangement (Refer to Figure 3 on page 41) Chillers may be applied in pairs with chilled liquid circuits connected in series and condenser liquid circuits connected in parallel. All of the chilled liquid flows through both evaporators with each unit handling approximately one-half of the total load. When the load decreases to a customer selected load value, one of the units will be shut down by a sequence control. Since all liquid is flowing through the operating unit, that unit will cool the liquid to the desired temperature. Series Counter Flow Arrangement (Refer to Figure 4 on page 41) - Chillers may be applied in pairs with chilled liquid circuits connected in series and with the condenser liquid in series counter flow. All of the chilled liquid flows through both evaporators. All of the condenser liquid flows through both condensers. The liquid ranges are split, which allows a lower temperature difference or head on each chiller, than multiple units in parallel. For JOHNSON CONTROLS 37

38 FORM EG1 (617) Application Data (Cont'd) equal chillers, the machine at higher temperature level will typically provide slightly more than half the capacity. Series counter flow application can provide a significant building energy savings for large capacity plants which have chilled and condenser liquid temperature ranges greater than typical AHRI requirements. GLYCOL APPLICATIONS The YVWA chiller is a good match for the high head requirements of low temperature glycol applications. This is particularly true of thermal ice storage systems, typically requiring 14 F (-10 C) to 40 F (4.4 C) leaving brine temperatures. This performance is enhanced with the standard thermal storage control mode described in the Accessories and Options section (see page 8). Particular attention must be paid to the application of two or more chillers with evaporators in parallel or series when the brine temperature is below 32 F (0 C). The glycol MUST NOT flow through the evaporator of the idle chiller because it can cause the condenser liquid to freeze. A bypass or other type of arrangement I required that shuts off flow to the idle evaporator. When units are applied in series with lead/leg capability, the units should be identical. HEAT PUMP The YVWA can act as a heat pump, extracting heat from the chilled water loop. The heat pump must have sufficient load on the condenser (heating) side to carry away the heat of compression of the system. The design working pressure (DWP) of the condenser vessel is one of the limiting factors for hot water production. If the load is less than the heat of compression load plus the refrigeration effect on the condenser side of the heat pump, the system will not be able to stay online. Heat pump mode and chiller/heat recovery capacity controls operation are mutually exclusive operational modes. The chiller mode produces cold water at setpoint, and any hot water recovered is simply a benefit. The heat pump mode produces hot water at setpoint and any cold water recovered is simply a benefit. Whichever limitation is reached first becomes the limiting factor and the heat pump will unload based on low water temperature or high discharge pressure. HEAT RECOVERY Heat recovery allows the utilization of heat that would otherwise be wasted (to the cooling tower), to serve a useful purpose. This heat of rejection can be used to: Pre-heat domestic hot water needs like in hotels or hospitals for use in laundry, showers, swimming pools, cooking/dishwashing, or hot tubs. Comfort heating (perimeter heating). Reheating of air. Preheating of boiler makeup water or process hot water. Heat recovery may be used in buildings where there is a need for concurrent heating and cooling loads. Overall operating energy savings result from utilizing some or all of the heat rejection of a normal vapor-compression cycle cooling system. Heat recovery uses available heat as a by-product from the cooling function, which differs from heat pumps where the heating can be considered the primary process. Also, the heat recovery usage is often a winter seasonal duty, where the chiller may be expected to operate in summer 38 JOHNSON CONTROLS