Multistack
Multistack’s ACF air-cooled MagLev platform scales to 850 tons with two-stage variable-speed oil-free centrifugal compression and optional integrated water-side or refrigerant free cooling.
Facts
Source per value- Smallest unit kW Lowest published cooling capacity across the chiller lines named in the 'Lines' field, converted from refrigeration tons at 3.517 kW per ton where the vendor publishes tons. Rating conditions differ by vendor and line, so compare ranges, not decimals. Blank when no line states a lower bound.
- Not published
- Largest unit kW Highest published cooling capacity of a single chiller across the lines named in 'Lines', converted from tons at 3.517 kW per ton where needed. Project totals, multi-unit plants and announced-only products are excluded. Blank when not published.
- 2,989 1
- Heat rejection How the named lines reject heat: air-cooled (condenser fans), water-cooled (cooling tower or dry cooler loop) or both. Absorption chillers run on a heat source instead of an electric compressor.
- Air-cooled 1
- Compressors Compressor technologies in the named lines, as the vendor words them: scroll, screw, centrifugal, magnetic-bearing (oil-free) centrifugal.
- Two-stage variable-speed centrifugal MagLev 2
- Oil-free At least one named line uses an oil-free compressor (magnetic-bearing or Turbocor-type). Blank means the vendor's pages do not say.
- Yes 2
- Refrigerants Refrigerants the vendor lists for the named lines. A refrigerant may be offered only on some sizes or markets; the record's sources say which.
- Not published
- HFO or natural refrigerant At least one named line is offered on an HFO, HFO blend or hydrocarbon refrigerant (R-1234ze, R-1233zd, R-515B, R-513A, R-454B, R-452B or R-290). Decided from the refrigerant names the vendor publishes.
- Not published
- Vendor-published GWP Global warming potential exactly as the vendor prints it. Vendors cite different IPCC assessment reports (AR4, AR5, AR6) and rounding, so values are not normalised. Blank when the vendor prints none.
- Not published
- Free cooling The vendor offers integrated or optional free cooling (outside air or a water-side economiser) on at least one named line. It does not mean the compressors stay off all year.
- Yes 2
- Max supply water °C Highest chilled-water supply (leaving) temperature the vendor states for a named line. A rating point is not an operating limit and is not used here. Blank when not stated.
- Not published
- Full-load recovery s Seconds from a power interruption to full cooling output, as the vendor states it for a named line.
- Not published
- Efficiency (as published) Efficiency figures with the metric and conditions the vendor gives (EER, SEER, IPLV, COP). The metrics are not interchangeable: SEER and IPLV are weighted part-load figures, EER and COP are single points.
- Not published
- AI or high-density claim The vendor names AI, high-density or liquid-cooled data centers as a target of a named line, on a page cited in the record's sources. Blank means no such claim was found on the pages read.
- Not published
- Data center focus Dedicated: the vendor names a chiller line for data centers. General: a standard chiller range that the vendor documents in data center use.
- Dedicated data center line 1
- Lines The chiller families this record covers. Capacity, refrigerant and temperature figures refer to these lines, not to the vendor's whole portfolio.
- ACF and ACF_M air-cooled MagLev 2
Sources
- multistack.com accessed 2026-11-11
- multistack.com accessed 2026-11-11
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