York YCUL0130 Guide Specifications, 2.03REFRIGERANT CIRCUIT, 2.04HEAT EXCHANGERS, 2.05CONTROLS

Guide Specifications

2.03REFRIGERANT CIRCUIT

One (YCUL0016-0040) or two (YCUL0046-0130) inde- pendent refrigerant circuits will be furnished on each unit. All unit piping will be copper, with brazed joints. The liquid line will include a field connection shutoff valve with charging port located on each condenser circuit. Suc- tion line connections are provided on each refrigeration circuit. Filter drier and sight glass are shipped loose for field installation on each refrigerant circuit.

All expansion valves and liquid line solenoid valves and refrigerant field piping are supplied by others.

2.04HEAT EXCHANGERS

A.Air Cooled Condenser:

1.Coils: Internally enhanced, seamless copper tubes, mechanically expanded into aluminum alloy fins with full height collars. Subcooling coil an integral part of condenser. Design working pressure shall be 450 psig (31 bar).

2.Fans: Shall be dynamically and statically balanced, direct drive, corrosion resistant glass fiber 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.

2.05CONTROLS

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

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

C.Microprocessor Control Center:

1.Condensing Unit control can be set for Dis- charge Air Temperature Control or for Suction Pressure Control. (Note: Suction Pressure Control requires optional Suction Pressure Transducers on Models YCUL0016-0066.)

2.Automatic control of compressor start/stop, anti-coincidence and anti-recycle timers,

automatic pump-down shut-down, condenser fans, unit alarm contacts, and condensing unit operation from 0°F to 125°F (-18°C to 52°C) ambient. Automatic reset to normal chiller operation after power failure.

3.Discharge air temperature reset via a Pulse Width Modulated (PWM) input signal or up to two steps of demand (load) limiting.

4.Software stored in non-volatile memory, with programmed set-points retained in lithium battery backed real time clock (RTC) memory for minimum 5 years.

5.Forty character liquid crystal display, descrip- tions in English (or Spanish, French, Italian, or German), numeric data in English (or Metric) units. Sealed keypad with sections for Set- points, Display/Print, Entry, Unit Options & clock, and On/Off Switch.

6.Programmable Set-points (within Manufacturer limits): display language; suction pressure setting and control range, remote reset tem- perature range, set daily schedule/holiday for start/stop, manual override for servicing, low and high ambient cutouts, number of compressors, low suction pressure cutout, high discharge pressure cutout, anti-recycle timer (compressor start cycle time), and anti- coincident timer (delay compressor starts).

7.Display Data: Suction temperatures (optional), low ambient temperature cutout setting, outdoor air temperature, English or metric data, suction pressure cutout setting, each system suction pressure (optional on YCUL0016-0066 models), discharge pressure (optional), dis- charge air reset via a YORK ISN DDC or Building Automation System (by others) via PWM input as standard or a 4-20milliamp or 0-10 VDC input or contact closure with optional BAS interface, anti-recycle timer status for each compressor, anti-coincident system start timer condition, compressor run status, no cooling load condition, day, date and time, daily start/stop times, holiday status, automatic or manual system lead/lag control (when controlling based on Discharge Air Temperature only), automatic lead/lag of compressors within a system, compressor starts/operating hours (each), status of hot gas valves, and fan operation, run permissive status, number of compressors running, liquid solenoid valve status, load & unload timer status.

8.System Safeties: Shall cause individual com- pressor systems to perform auto shut down; manual reset required after the third trip in 90 minutes. Includes: high discharge pressure,

118 YORK INTERNATIONAL