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FORM
REFRIGERANT CIRCUIT
•Independent refrigerant circuits per compressor, each using copper refrigerant pipe formed on com- puter controlled bending machines. This eliminates over 60% of system piping brazed joints as com- pared to designs that use fittings, resulting in a highly reliable and leak resistant system.
•Liquid line components include: manual
•Economizer is a refrigerant to refrigerant, compact
•Suction and discharge lines provided with manual compressor shutoff service valves. Suction line equipped with
•Oil separators with Design Working Pressure of 450 PSIG (31 bar) and U.L. listing are high efficiency, augmented aerosol impingement type to maximize oil extraction without fragile media to break down.An oil charging valve is included with each refrigerant circuit.
•Oil cooling provided by dedicated air cooled finned tube type heat exchanger located in the condenser section of the machine.
MICROPROCESSOR CONTROLS
•Controls housed in a powder painted steel cabinet enclosure, equivalent to NEMA 3R/12 (IP55), with hinged, latched, and gasket sealed, door.
•Liquid crystal 40 character display with text provided on two lines and light emitting diode backlighting for outdoor viewing.
•Color coded, 32 button, sealed keypad with sections for Display, Entry, Setpoints, Clock, Print, Program and Unit On/Off.
•Standard controls include: brine chilling or thermal storage, automatic pump down, run signal contacts, demand load limit from external building automa- tion system input, remote liquid temperature reset input, unit alarm contacts, evaporator pump control, automatic reset after power failure, automatic sys- tem optimization to match operating conditions, soft- ware stored in
backed RTC memory for a minimum 5 years.
•Display – In English (°F and PSIG) or Metric (°C and Bars) units, and for each circuit:
♦Return and leaving chilled liquid, and ambient tem- perature.
♦Day, date and time. Daily start/stop times. Holi- day and Manual Override status.
♦Compressor operating hours and starts. Auto- matic or manual lead/lag. Lead compressor iden- tification.
♦Run permissive status. No cooling load condi- tion. Compressor run status.
♦
♦Suction (and suction superheat), discharge, and oil pressures and temperatures per System.
♦Percent full load compressor motor current per phase and average per phase. Compressor ca- pacity control valve input steps.
♦Cutout status and
♦Unloading limit
♦Liquid
♦Status of: evaporator heater, condenser fans, load and unload timers, chilled water pump.
♦“Out of range” message.
♦Up to 6 fault shut down conditions.
♦Standard Display Language is English, with Op- tions for: French, German, Italian, and Spanish.
•Entry – Enter set point changes, cancel inputs, ad- vance day, change AM/PM.
•Setpoints – Chilled liquid temperature, chilled liq- uid range, remote reset temperature range.
•Clock – Time, daily or holiday start/stop schedule, manual override for servicing.
•Print – Operating data or system fault shutdown his- tory for last six faults, and software version. Print- outs through an
•Program –
♦Low leaving liquid temperature cutout, 300 to 600 second
YORK INTERNATIONAL | 5 |