York YZ Series Magnetic Bearing Chiller

The YORK® Model YZ Magnetic Bearing Centrifugal Chiller represents a monumental leap forward in green building technology and cooling efficiency. Specifically engineered from the ground up to optimize the use of next-generation R-1233zd refrigerant, the YZ chiller combines an ultra-low Global Warming Potential (GWP) of 1 with zero Ozone Depletion Potential (ODP). Moving beyond traditional designs that simply retrofit old systems, the YZ chiller features fully optimized components including a falling-film evaporator that reduces refrigerant charge by up to 60% compared to flooded designs. Backed by variable-speed drive technology and an advanced electronic expansion valve, the YZ chiller achieves extraordinary energy savings—slashing annual energy consumption by up to 35% compared to conventional fixed-speed, oil-lubricated chillers. At the heart of the YORK® YZ chiller's remarkable lifespan is its advanced magnetic bearing system. By replacing traditional mechanical bearings with high-tech electromagnetic levitation, the compressor's rotor shaft is completely suspended in a frictionless, non-contact state during operation. This eliminates the need for physical oil lubrication, bypassing the complex oil pumps, oil heaters, filtration loops, and separator systems that drive up traditional maintenance costs. Without oil circulating through the system, the heat exchanger tubes remain perfectly clean and free from performance-degrading oil coatings. This ensures that the chiller retains its factory-level heat transfer efficiency year after year while completely removing the recurring costs of oil changes and filter replacements.

The YZ chiller utilizes a single-stage, high-speed centrifugal compressor powered by a hermetic, permanent-magnet synchronous motor. This direct-drive configuration eliminates transmission losses and mechanical failure risks by mounting the impeller directly onto the motor shaft, removing speed-increasing gears entirely. To ensure continuous operation during grid instability, the unit features built-in power failure protection. During a sudden power outage, the permanent-magnet motor immediately acts as a generator, converting rotational inertia into electricity to keep the magnetic bearings fully powered. This keeps the shaft safely levitated until the compressor slows to a complete, controlled stop. This clean, gearless architecture dramatically lowers the count of consumable moving parts, maximizing system reliability for mission-critical facilities.