ALTERNATIVE REFRIGERANTS - Contact your nearest YORK of- fice for information and availability on alternative HFC refrigerants.
ELECTRICAL OPTIONS:
MULTIPLE POINT POWER SUPPLY CONNECTION -
Standard field power wiring connection on all models is Multiple Point Power Connection to factory provided Terminal Blocks. Two field supplied electrical power circuits with appropriate branch cir- cuit protection provide power to each of two motor control center cabinets, located on either side of the Control panel on the front of the chiller. Each cabinet contains starter elements for one com- pressor.
Optional to the Terminal Blocks for field power connection are Non-Fused Disconnects or Circuit Breaker Switches with external, lockable handles.
SINGLE POINT POWER CONNECTION - (Factory Mounted) An optional configuration for field connection of a single electrical cir- cuit to: either Terminal Block or Non-Fused Disconnect Switch with lockable external handle (in compliance with Article 440 of N.E.C., to isolate unit power supply for service). Factory wiring is pro- vided from the Terminal Block or Disconnect Switch to Factory supplied individual system Circuit Breakers, Non-Fused Disconnect switch with external, lockable handle or J Class Fuses/Fuse Block in each of the two compressor motor control centers. (Note: Single Point Non-Fused Disconnect Switch will not be supplied with indi- vidual system Non Fused Disconnect Switches with external, lock- able handles in each of the two compressor motor control cen- ters).
65Ka HIGH VOLTAGE PROTECTION - Non-Fused Disconnect Switch with fuses (200 & 575V) or Circuit Breakers (230, 380, & 460V) are used for applications where customers have a require- ment for single point wiring with high “fault current” withstanding capability. This option provides between 50Ka and 65Ka withstand protection to the equipment.
BUILDING AUTOMATION SYSTEM INTERFACE (Factory Mounted) – Provides means to reset the leaving chilled liquid temperature or percent full load amps (current limiting) from the BAS (Factory Mounted):
•Printed circuit board to accept 4 to 20 milliamp, 0 to 10 VDC, or dry contact closure input from the BAS.
•A YORK ISN Building Automation System can provide a Pulse Width Modulated (PWM) signal direct to the standard control panel via the standard onboard RS485 port.
FLOW SWITCH – The flow switch or its equivalent must be fur- nished with each unit. 150 PSIG (10.5 bar) DWP – For standard units. Johnson Controls model F61MG-1C Vapor-proof SPDT, NEMA 4X switch (150 PSIG [10.5 bar] DWP), -20°F to 250°F- (29°C to 121°C), with 1" NPT connection for upright mounting in horizontal pipe. (Field mounted)
DIFFERENTIAL PRESSURE SWITCH - Alternative to the above men- tioned Flow Switch. Pretemco Model DPS 300A-P4OPF-82582-S (20.7bar max working pressure). SPDT 5 amp 125/250 VAC switch. Range: 0 - 2.8bar, deadband: 0.003 - 0.005bar, with 1/4 NPTE pres- sure connections.
LANGUAGE LCD AND KEYPAD - Standard display language and
keypad is in English. Spanish is available as an option.
PRINTER KIT - Printer for obtaining printout of unit operating and history data. (Field Mounted)
MULTIPLE UNIT SEQUENCE CONTROL (Field Mounted) - Se-
quencing Control with automatic unit sequencing. Necessary items for operation and control of up to eight units with parallel water circuits. Includes software and mixed liquid temperature sensor (interconnecting wiring by others).
PRESSURE VESSEL CODES - Coolers and condensers can be supplied in conformance with the following pressure codes: A.S.M.E. (Standard)
CHICAGO CODE RELIEF VALVES (Factory Mounted) - Unit will be provided with relief valves to meet Chicago Code requirements.
ACCESSORIES:
FLANGES (Weld Type) – Consists of 150 PSI (10.5 bar ) standard cooler (150 lb) R.F. flanges to convert to flanged cooler-connec- tions and includes companion flanges. (Field mounted)
FLANGES (Victaulic Type) – Consists of (2) Flange adapter for grooved end pipe (standard 150 PSI [10.5 bar] cooler). Includes companion flanges. (Field mounted)
VIBRATION ISOLATION:
•Neoprene Isolators – Recommended for normal installations. Provides very good performance in most applications for the least cost. (Field mounted)
•1" Spring Isolators – Level adjustable, spring and cage type isolators for mounting under the unit base rails. 1" nominal de- flection may vary slightly by application. (Field mounted)
•2" Seismic Spring Isolators – Restrained Spring-Flex Mountings incorporate a rugged welded steel housing with vertical and horizontal limit stops. Housings designed to withstand a mini- mum 1.0g accelerated force in all directions to 2". Level adjust- able, deflection may vary slightly by application. (Field-mounted)
ALTERNATIVE CHILLED FLUID APPLICATIONS:
Standard water chilling application range is 40°F to 50°F (4.4°C to 10°C) Leaving Chilled Water Temperature. To protect against nui- sance safety trips below 40°F (4.4°C) and reduce the possibility of cooler damage due to freezing during chiller operation, the unit microprocessor automatically unloads the compressors at abnor- mally low suction temperature (pressure) conditions , prior to safety shutdown.
•Process Brine Option – Process or other applications requir- ing chilled fluid below 40°F (4.4°C) risk water freezing in the evaporator, typically overcome by using antifreeze. For these applications, the chiller system incorporates brine (ethylene or propylene glycol solution), and the system design Leaving Chilled Fluid Temperature must be provided on the order form to ensure proper factory configuration.
•Thermal Storage Option – Thermal Storage equires special capabilities from a chiller, including the ability to ‘charge’ an ice storage tank, then possibly automatically reset for operation at elevated Leaving Chilled Fluid Temperatures as required by au- tomatic building controls. The Thermal Storage Option provides Ice Storage duty Leaving Chilled Fluid setpoints from 25°F to 15°F( -4°C to -10°C) minimum during charge cycle, with a Reset range of 36°F (20°C) supply fluid temperature.
