York R134A manual Evaporator, Condenser Section, Microprocessor Controls

FORM 201.23-EG1 (1007)

•Discharge line provided with manual compressor shutoff service valve (See Options and Accessories for suction line valve). Suction line equipped with closed- cell insulation.

•Insulated external oil separators with no moving parts, 450 PSIG (31 bar) design working pressure, and UL listing. Refrigerant system differential pressure pro- vides oil flow through service replaceable, 0.5 micron, full flow, cartridge type oil filter internal to compres- sor.

•Oil cooling provided by dedicated air cooled finned tube type heat exchanger located in the condenser section of the machine.

•A flash tank is located in each refrigerant circuit to increase the system efficiency. The design working pressure is 450 PSIG (31 bar).

•Suction lines, oil separators and flash tanks are cov- ered with closed-cell insulation.

EVAPORATOR

•High efficiency, direct-expansion type cooler with re- frigerant in tubes and chilled liquid through the baffled shell. Independent circuits provided for each compres- sor.

•Design working pressure of the shell waterside is 150 PSIG (10.3 bar), and 235 PSIG (16 bar) for the refrig- erant side. Constructed and tested IAW applicable sections of ASME Pressure Vessel Code, Section VIII, Division (1). Water side exempt per paragraph U-1, ©,

(6).

•Removable heads allow access to internally-en- hanced, seamless, copper tubes. Water vent and drain connections included.

•The evaporator is equipped with a thermostatically controlled heater for protection to -20°F (-29°C) am- bient, and shell is covered with 3/4” (19mm), flexible, closed-cell insulation, thermal conductivity of 0.26k

(BTU/HR-Ft2-°F/in.) maximum.

•Water nozzles have grooves for mechanical (ANSI/ AWWA C-606) couplings, and shall be insulated by

Contractor after pipe installation. (See the Accessories and Options section for flange options.

CONDENSER SECTION

•Condenser fans are dynamically and statically bal- anced, direct drive, corrosion resistant glass fiber reinforced composite blades molded into low noise, full airfoil cross section, providing vertical air discharge from extended orifices. Guards of heavy gauge, PVC

(polyvinyl chloride) coated.

•Standard and reduced sound level models have

JOHNSON CONTROLS

condensers fitted with single speed fans. Low sound models have two speed fans fitted.

•The fan motors are the high efficiency, direct drive, 6 pole on standard sound models and 8 pole on reduced and low sound models, 3 phase, Class-“F”, current overload protected, totally enclosed (TEAO) type with double sealed, permanently lubricated, ball bearings

•Fin and tube condenser coils of seamless, internally enhanced, high condensing coefficient, corrosion re- sistant copper tubes arranged in staggered rows and mechanically bonded to corrosion resistant aluminum alloy fins with full height fin collars. Design working pressure is 450 PSIG (31 bar).

MICROPROCESSOR CONTROLS

•Microprocessor control system provides automatic control of chiller operation including compressor start/ stop and load/unload, anti-recycle timers, condenser fans, evaporator pump, evaporator heater, unit alarm contacts and run signal contacts.

•Chiller automatically resets to normal chiller operation after power failure.

•Unit operating software is stored in non-volatile memory. Field programmed set points are retained in lithium battery backed regulated time clock (RTC) memory for minimum 5 years.

•Alarm contacts are provided to remote alert contacts for any unit or system safety fault.

•Display and Keypad:

♦80 character liquid crystal display that is both view- able in direct sunlight and has LED backlighting for nighttime viewing. One keypad and display panel is provided with every chiller.

♦Display and keypad is accessible through display access door without opening main control/electrical cabinet doors.

♦Display provides unit setpoints, status, electrical data, temperature data, pressures, safety lock- outs and diagnostics without the use of a coded display.

♦Descriptions in English (or available language op- tions), numeric data in English (or Metric) units.

♦Sealed keypad shall include unit On/Off switch.

•Programmable Setpoints (within Manufacturer limits): display language; leaving chilled liquid temperature: setpoint, control range; local or remote control; units of measure; compressor lead/lag; and maximum chilled water setpoint reset temperature range.

•Display Data: Chiller liquid return and leaving tempera- tures, ambient, lead compressor identification, clock