Daikin Applied Magnitude WME

Oil-free magnetic-bearing centrifugal chiller with Danfoss Turbocor compressors, 400-1,600 tons

Daikin Applied Magnitude WME is one of 5 chillers tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.

Chilled water is only the upstream half of a high-density cooling loop: once heat is picked up at the die rather than in the room, the plant feeds coolant distribution units and immersion tanks tracked under liquid cooling, which run off the same chilled-water supply as the units on this page. The catalogue entries closest to that decision are Vertiv Liebert XDU Coolant Distribution Unit and CoolIT Systems DCLC Direct Liquid Cooling.

Daikin Applied Magnitude WME oil-free magnetic-bearing chiller: verified specs, refrigerant GWP position, inspection checklist, and pricing status.

Who buys it

Hyperscale data center operators specify the WME-C Quad (2,000-3,000 tons, four Turbocor compressors) for new mission-critical plants. Hospitals, universities, and office towers buy mid-range WME and legacy WMC frames (86-1,600 tons) for continuous comfort-cooling loads. WME-D buyers need a single machine that delivers simultaneous heating and cooling for heat-recovery plants.

Role in the data center

In a hyperscale data center chiller plant, the WME-C Quad frame (2,000-3,000 tons, four parallel Turbocor compressors) serves as the primary large-capacity machine feeding chilled water to CRAH units or CDUs, marketed by Daikin explicitly for this role since its September 2025 launch. Smaller WME and legacy WMC frames (86-1,600 tons) fill mid-size or N+1 redundant plant positions at edge or colocation facilities. Because published efficiency figures are standard AHRI 550/590 IPLV numbers rather than project-specific NPLV, a buyer sizing against real data center load and water-temperature profiles needs a manufacturer-run NPLV rather than the brochure figure.

Key specifications

Technical summary

Capacity range, WMC legacy: 86-400 tons (300-1,400 kW) Capacity range, WME current: 400-1,600 tons (1,400-5,600 kW) Capacity range, WME-C Quad: 2,000-3,000 tons Refrigerant, current family: R-513A, R-515B, or R-1233zd(E) Refrigerant, legacy WMC: R-134a (GWP 1,430) Full-load efficiency, WME-C Quad: 0.52 kW/ton IPLV, WME-C Quad and WMT: 0.30 kW/ton Compressor: Danfoss Turbocor, oil-free, magnetic-bearing Compressor count by frame: 1 (S) / 2 (D) / 4 (Quad) Tube materials: copper, 90/10 CuNi, 70/30 CuNi, stainless, titanium Electrical supply: 380-480V and 575V, 50/60Hz AHRI: certified to AHRI Standard 550/590 (OEM catalog claim)

Configurations and options

Refrigerant is a build-time choice among R-513A, R-515B, and R-1233zd(E) on current Magnitude production, with R-134a limited to legacy WMC units. Compressor count is a frame-size configuration: single-compressor (S) at the smallest sizes, dual-compressor (D) through most of the WMC/WME range, and four Turbocor compressors on the WME-C Quad. Evaporator/condenser tube material is a build option among copper, 90/10 CuNi, 70/30 CuNi, stainless steel, or titanium, at 0.025-, 0.028-, or 0.035-inch wall thickness. Electrical supply spans 380-480V or 575V at 50/60Hz.

Compatibility and dependencies

A dual-compressor WMC/WME frame (D suffix) continues at roughly 60% of rated capacity if one Turbocor compressor fails, buying time before a repair; a single-compressor frame (S suffix) loses all cooling on that same failure. The WME-C Quad's four compressors in a dual-circuit series counter-flow arrangement give the deepest partial-failure margin in the line. MicroTech II or III control platform is required for compressor diagnostics, and a pre-2016 WMC unit's board and OITS software revision should be confirmed as still supported before purchase. The chiller depends on an external condenser-water loop and cooling tower; no factory-integrated free-cooling coil exists on this water-cooled family.

Pricing and availability

Trend: flat

Common failure points

• Turbocor compressor motor/bearing electronics — Repeated bearing-status fault or failure to levitate on start, compressor will not spin up
• Compressor VFD/inverter — Elevated Inverter Temperature or Cavity Temperature register readings, nuisance trips
• Evaporator/condenser tubes — Reduced approach temperature, rising head pressure
• MicroTech control board/software revision — An OITS or control-software version older than current-supported builds
• Refrigerant charge and seals, legacy R-134a units — Recurring low-charge alarms, frequent top-offs
• IGV (inlet guide vane) actuator — IGV percentage-open reading stuck or erratic on the MicroTech display
• Compressor starts/stops count — A high cumulative start count relative to run hours, frequent short-cycling

Inspection checklist

Nameplate model, serial number, and tonnage cross-check — verify a "250 Ton" dataplate against the model-number suffix itself, since WMC and WME frames span 75 to 3,000 tons across generations and a swapped or mismatched dataplate is easy to miss on a used unit Compressor count and configuration — confirm single (S), dual (D), or quad (Quad) Turbocor arrangement; a dual unit continues operating at roughly 60% of rated capacity on one compressor after the other fails, a single-compressor unit does not Compressor Run Hours register (MicroTech Modbus points 40175/40236/40239/40242, one set per compressor) — pull and compare against the seller's claimed in-service years; an implausibly low reading on an older-vintage unit is a red flag Compressor Starts register (Modbus points 40174/40235/40238/40241) — pull alongside run hours; a high starts-to-hours ratio signals short-cycling that stresses the compressor's touchdown bearings even though the machine runs oil-free Compressor Fault Log — request the last 90 days of alarm entries from the OEM's own alarm table (Table 13 in the WMC IOM) rather than accepting a single point-in-time "no faults" screenshot Bearing status export from Danfoss's own Turbocor Service Monitoring Tools software — obtain this per compressor, up to 4 on a Quad frame, since this is the primary diagnostic channel for magnetic-bearing health on this machine, not just the chiller OEM's summary alarm screen IGV (inlet guide vane) actuation test — cycle each compressor's IGV through its full 0-110% travel range on-site and confirm smooth, repeatable position feedback with no binding Inverter and cavity temperature trend (Modbus points 40086/40087/40106/40107) — review logged history rather than a single reading; repeated excursions above normal range point to a VFD cooling-airflow problem Evaporator and condenser eddy-current tube test — require results current within the last 12 months, with measured wall thickness compared against the as-built 0.025-, 0.028-, or 0.035-inch standard gauge stamped on the original submittal Tube material verification — confirm actual tube material (copper, 90/10 CuNi, 70/30 CuNi, stainless steel, or titanium) against the submittal, since re-tube cost differs sharply by material Refrigerant identification and charge verification — confirm nameplate refrigerant (R-134a, R-513A, R-515B, or R-1233zd(E)) against the actual current charge; GWP spans roughly 1 to 1,430 across these four options Refrigerant leak-rate history — request the most recent 12 months of makeup-charge records; category-wide data attributes 25-30% of all chiller service calls to refrigerant leaks Control software/board revision — record the exact OITS and control-software version strings on the HMI, e.g. a "2.01.01"-class OITS build with a "WMCU3UU02B"-style control string on a legacy WMC unit, and confirm current parts/firmware support with Daikin Applied Design pressure and hydrostatic test data — confirm evaporator/condenser design pressures (200 psi refrigerant-side / 150 psi water-side, per the legacy WMC platform) against the most recent pressure-test certificate on file Minimum entering condenser water temperature capability — OEM catalogs show figures as low as 40F on some generations and a 55F minimum on others; confirm which spec applies to the actual unit before accepting the receiving-site cooling tower as adequate