Recirculating Chiller

Recirculating Chiller Full-Series Specification Comparison

Every DLSB recirculating chiller in this category sits in one comparison table below: sealed and non-sealed builds, -30℃ and -40℃ low-temperature limits, published power draw, coolant tank or reservoir volume and pump circulation data, each model linked to its full product page.

Values are aggregated from the specification tables and parameter sheets published on each UnionClay product page. A dash means the page does not publish that value. Complete parameters, safety protection data and connector details are on each linked product page.

How to Choose Within the DLSB Series

• Sealed against non-sealed

  Sealed builds circulate through a closed expansion tank — 2L to 35L across the table — and keep the coolant away from open air. Non-sealed builds use an open 5L to 100L reservoir that is simpler to top up and inspect. If coolant exposure or condensation matters in your lab, start from the sealed half of the table.

• -30℃ against -40℃

  Both limits exist for every frame, and the -30 variant consistently draws less power at the same size: 4KW against 4.6KW at DLSB-50, 0.9KW against 1KW at DLSB-5 in the sealed line. If the condenser or jacket load is comfortable at -30℃, buying -40℃ as insurance mostly buys a higher power draw.

• Pump flow and head

  Sealed frames publish 20 to 45 L/min flow with 20 to 25 m head; non-sealed frames publish 10 to 60 L/min with 6 to 11 m head. Long coolant lines, narrow condenser coils and height differences consume head quickly — when the chiller sits far from the equipment it serves, read the pump column before the temperature column.

• Voltage and utilities

  220V,50Hz covers the small frames. Every sealed -40 build from DLSB-20-40 upward and all 100L-class units run 380V,50Hz. Confirm the supply at the installation point first — a 380V machine facing a 220V-only lab is the most avoidable mismatch in this table.

Frame-by-Frame Notes from the Published Tables

• 5 and 10-class frames

  The entry frames stay on 220V,50Hz across both builds and both temperature limits. Sealed tanks run 2L on the 5-class and 7L on the 10-class; non-sealed reservoirs run 5L and 10L. Published power spans 0.58KW on the DLSB-5-30 non-sealed up to 1.4KW — bench condensers and small jacketed vessels are the natural duty here.

• 20 and 30-class frames

  This is where the voltage split starts: the -40 builds move to 380V,50Hz while the -30 builds stay on 220V in both lines. Sealed tanks hold 7L to 10L, non-sealed reservoirs 20L to 30L, and power runs 1.3KW to 3.3KW. If the site has no 380V supply, the -30 variants are the practical ceiling of this pair.

• 50-class frames

  All four 50-class pages publish 380V,50Hz at 4KW to 4.6KW. The pump contrast is the sharpest in the whole table: the sealed build lists 20 L/min at 20 m head, the non-sealed lists 60 L/min at 6 m head — one favors lift over distance, the other favors volume through short fat lines. Pick by the loop, not by habit.

• 100-class frames

  The largest published frames pair a 35L expansion tank (sealed) or a 100L open reservoir (non-sealed) with 4.8KW to 5.7KW draw, all on 380V. Pump data flips against the 50-class: 45 L/min at 25 m head sealed, 35 L/min at 11 m head non-sealed — worth a second read if the install spans floors.

Where These Chillers Sit in a Process Line

In a working line these chillers hold the cold side of four jobs this catalog already maps: reactor jacket cooling, rotary evaporator condenser cooling, molecular distillation condenser support and general laboratory process cooling. The frame class follows the heat load of that connected equipment — which is why the quote checklist below asks about the equipment served before anything else.

What these pages do not publish, by design: cooling capacity at specific temperature points and a recommended coolant medium. Both depend on the working condition, so ask for them in the quotation instead of estimating from the power column — total power is electrical draw, not cooling duty.

Mistakes This Table Is Built to Prevent

• Sizing by tank volume

  The tank and reservoir column describes coolant holding, not cooling duty. Two machines with the same 10L figure can sit in different frames with different power draw — size from the equipment served and the temperature limit, then confirm duty at quotation.

• Assuming the lab supply fits

  Half this table runs 380V,50Hz. Ordering a 380V frame into a 220V-only room is the classic avoidable rework — the voltage column exists so that conversation happens before the purchase order, not after delivery.

• Ignoring pump head until installation

  Head spans 6 m to 25 m across the table. A chiller that holds temperature perfectly but cannot push coolant up to a mezzanine condenser is still the wrong chiller — read flow and head against the real line routing.

• Defaulting to -40℃ for safety

  The -30 variant of every frame draws less published power for the same circulation. If the process never goes below -25℃, the -40 column is paying for margin the table already shows is unnecessary.

Quote Checklist for This Category

Selection FAQ

Related Equipment and Quotation Support

A chiller is rarely bought alone. These hubs cover the equipment that usually shares the same purchase order, and the UnionClay team matches models across categories from one inquiry.

• Heating and Cooling Integrated Machine — when the same loop must also heat
• Rotary Evaporator — the most common condenser load for these chillers
• Glass Reactor — jacketed vessels these chillers circulate through