York 28971AR manual Refrigerant Circuit Components, Heat Exchangers, Controls

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Guide Specifications (Continued)

valve to command compressor capacity independent of control valve input pressure and balance compres- sor capacity with cooling load.

2.03REFRIGERANT CIRCUIT COMPONENTS

Each independent refrigerant circuit shall include: liq- uid line shutoff valve with charging port, low side pres- sure relief device, removable core filter-drier, solenoid valve, sight glass with moisture indicator, thermostatic expansion valves, and flexible, closed-cell foam insu- lated suction line.

2.04HEAT EXCHANGERS

A.Evaporator:

1.Direct expansion type with refrigerant inside high efficiency copper tubes, chilled liquid forced over the tubes by galvanized steel baffles. Indepen- dent refrigerant circuits per compressor.

2.Constructed, tested, and stamped in accordance with applicable sections of ASME pressure ves- sel code for minimum 350 PSIG (24 bar) refriger- ant side design working pressure and 150 PSIG (10 bar) water side design working pressure.

3.Shell covered with ¾ " (19mm), flexible, closed- cell insulation, thermal conductivity of 0.26k ([BTU/HR-Ft2-°F]/in.) maximum. Water nozzles with grooves for mechanical couplings, and insu- lated by Contractor after pipe installation.

4.Provide vent and drain fittings, and thermostati- cally controlled heaters to protect to -20°F (-29°C) ambient in off-cycle.

B.Air Cooled Condenser:

1.Coils: Internally enhanced, seamless copper tubes, mechanically expanded into aluminum al- loy fins with full height collars. Subcooling coil an integral part of condenser. Design working pres- sure shall be 450 PSIG (31 bar).

2.Fans: Shall be dynamically and statically bal- anced, direct drive, corrosion resistant glass fi- ber reinforced composite blades molded into low noise, full airfoil cross section, providing vertical air discharge from extended orifices for efficiency and low sound. Each fan in its own compartment to prevent cross flow during fan cycling. Guards of heavy gauge, PVC (polyvinyl chloride) coated or galvanized steel.

3.Fan Motors: High efficiency, direct drive, 6-pole, 3-phase, insulation class “F”, current protected, Totally Enclosed Air-Over (TEAO), rigid mounted, with double sealed, permanently lubricated, ball bearings.

C. Refrigerant Economizer (when provided): Stainless steel plate type, oven brazed with copper, U.L./cU.L. Listed, 450 PSIG (31 bar) design working pressure.

2.05CONTROLS

A. General: Automatic start, stop, operating, and pro- tection sequences across the range of scheduled conditions and transients.

B. Control Circuit Transformer: Factory mounted with primary breaker having lockable, external handle, and 115V/1Ø secondary.

C. Microprocessor Enclosure: Rain and dust tight NEMA 3R/12 (IP55) powder painted steel cabinet with hinged, latched, and gasket sealed door.

D. Microprocessor Control Center:

1.Automatic control of compressor start/stop and load/unload, anti-coincidence and anti-recycle tim- ers, automatic pump-down at start-up and shut- down, condenser fans, evaporator pump, evapo- rator heater, unit alarm contacts, run signal con- tacts, and chiller operation from 0°F to 125°F (-18°C to 52°) ambient. Automatic reset to nor- mal chiller operation after power failure.

2.Setpoint Reset:

a.Pulse Width Modulated (PWM) input to reset current unload setpoint downward via signal from external Energy Management System (EMS), maximum allowable reset program- mable from microprocessor keypad.

b.PWM input to reset the chilled liquid setpoint upward via signal from remote EMS, maxi- mum allowable reset programmable from mi- croprocessor keypad.

3.Software stored in non-volatile memory, with pro- grammed setpoints retained in lithium battery backed real time clock (RTC) memory for mini- mum 5 years.

4.Forty character liquid crystal display, descriptions in English (or Spanish, French, Italian, or Ger- man), numeric data in English (or Metric) units. Sealed keypad with sections for Setpoints, Dis- play, Entry, Print, Program, Clock, and Unit On/ Off Switch.

5.Programmable Setpoints (within Manufacturer limits): display language; discharge pressure un- load and cutout; low suction pressure cutout; low and high ambient cutouts; leaving chilled liquid temperature: setpoint, control range, and cutout; high motor current unload; anti-recycle time; lag compressor start; local or remote control; units of measure; compressor lead/lag; power failure restart (auto or manual), and maximum EMS- PWM reset temperature range.

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YORK INTERNATIONAL

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Contents Millennium Table of Contents Introduction York Millennium Air Cooled Screw Liquid ChillersSEMI-HERMETIC York Screw Compressors SpecificationsComplete Factory Package Condenser SectionRefrigerant Circuit Microprocessor ControlsPower Panel Accessories and Options DX Cooler Options Vibration IsolationHigh Static Fans Sound Reduction OptionsTemperatures and Flows Temperature and FlowsSI Units Water Pressure Drop English UnitsSI Units Pressure Drop kPaRatings English Units Model YCAS0110EC Iplv =Model YCAS0110EC Model YCAS0090ECModel YCAS0100EC 100 105 110 115 120 125Model YCAS0120EC Iplv = Model YCAS0140EC Model YCAS0120ECModel YCAS0130EC Model YCAS0150EC Iplv = Model YCAS0170EC Model YCAS0150ECModel YCAS0160EC Model YCAS0180EC Iplv = Model YCAS0210EC Model YCAS0180ECModel YCAS0200EC Model YCAS0230EC Iplv = Model YCAS0270EC Model YCAS0230ECModel YCAS0250EC Model YCAS0300EC Iplv = Model YCAS0360EC Model YCAS0300ECModel YCAS0330EC Model YCAS0400EC Iplv = Model YCAS0400EC Model YCAS0440ECRatings SI Units Model YCAS0120EC YCAS0160EC YCAS0170ECYCAS0180EC Model YCAS0200ECModel YCAS0230EC Model YCAS0300EC Model YCAS0400EC Model YCAS0440EC Physical Data English UnitsCondenser Fans SI Units Refrig. Charge, R-22,Ckt.-1 / Ckt.-2, kg Dimensions YCAS0090 0100EC English View A-ACenter of Gravity Alum 0090 73.7 41.9 38.4 0100 73.8 41.7 30.01Dimensions YCAS0090 0100EC SI 0090 1872.9 1063.3 0100 1875.4 1059.8Dimensions YCAS0110 0120EC English 0120 82.8 43.2 38.9Dimensions YCAS0110 0120EC SI 1834.7 1095.7 0120 1837.0 1093.8Dimensions YCAS0130 0180 English 130 1500150 01300140 0160Dimensions YCAS0130 0180 SI 130 150 438 4572573.0 1127.8 960.1 Dimensions YCAS0200 0230 English 0230 02000210 Dimensions YCAS0200 0230 SI 0210 3032.8 0200 3032.8965.2 0230 3032.8Dimensions YCAS0250 0270 English 16 Egde of Unit to Cooler Connection0250 141.6 33.8 0270 140.6 41.7 33.7 144.5 42.0 40.3Dimensions YCAS0250 0270 SI All dimensions are Mm unless otherwise noted1066 1023 02501063 1030 0270 Dimensions YCAS0300 0330 English 16 Edge of Unit to Cooler Connection0300 0330Dimensions YCAS0300 0330 SI 3911 1057 883 0300 3842 1058 876 0330Dimensions YCAS0360 English View A-A View C-C0360 197.3 44.0 33.2 0360 200.7 44.0 39.6Dimensions YCAS0360 SI 0360 5011 1117 844 5097 1005 Dimensions YCAS0400 0440 English 218.7 44.0 34.1 Dimensions YCAS0400 0440 SI 0400 0440Operating Weights Aluminum Fin Coils LbsIsolator Selection Aluminum Fin Coils Operating Weights Copper Fin Coils Copper FIN Coil Weight Distribution by Model LBS Ycas TotalIsolator Selection Copper Fin Coils Or RD-4 Isolator DetailsOr RD-3 AWMR-2-XXX CP-2-XXAWMR-1-XXX System #1 FIELD-SUPPLIED Wiring Electrical DataOPT. NF FLA See page 89 for Electrical Data footnotes MIN NF OVER-CURRENT Wire Range Data Ycas Chiller FIELD-SUPPLIED Wiring System #1 System #2 Model Volts Compressor Data Field Supplied Wiring LRA RLA Standard Optional NF FLA LRA RLA Electrical Notes RLA LRA QTY20A 30A Power Connection Options Style F 2 Compressor Power Wiring ConnectionsLD05550 See Note Control Power Wiring As Shown OnTwo Compressor Diagrams CB1 CB3 CB2 CB4 Typical Control Wiring 2-Compressor Units For Legend Refer to Bottom Foundation Application DataUnit Location Chilled Liquid PipingGuide Specifications Controls Refrigerant Circuit ComponentsHeat Exchangers Power Connection and Distribution 100 Part 3 Execution Installation 102 103 Proud Sponsor