Advantage BG Series Glycol Chillers

Standard duty is 25°F to 30°F leaving fluid temperature with glycol in the loop, adjustable from 20°F up to 70°F depending on the model. Without glycol, treat 48°F as the practical floor — run colder than that on plain water and you risk a frozen evaporator.

Both share the same compressor and refrigerant platform. The "-N4" suffix marks a NEMA 4 weatherproof cabinet built to sit outside year-round in place of the standard indoor enclosure — the core chiller inside is the same design.

They share the same underlying weatherproof platform, but the OACS-BC units are configured, charged and controlled specifically for glycol duty at 25-30°F on a water-and-glycol mixture — different fluid, different setpoints and controls than the plain-water OACS chiller sold elsewhere on this site. Don't plan service or fluid changes off the standalone OACS documentation.

If your process needs a leaving fluid temperature at or below roughly 48°F, or the unit itself will see freezing ambient temperatures, you need glycol. Above that, a plain-water MG (portable) or Titan/OACS (central) chiller from elsewhere on this site is usually the simpler, lower-maintenance choice. Tell us your target temperature and we'll confirm which line fits.

For the standard 25°F leaving fluid temperature, Advantage specifies a 30-35% inhibited propylene glycol mix. The rule behind that number is a freeze point about 25°F below the lowest setpoint; on outdoor N4 units, protect to the lowest expected ambient instead if that is colder. Check the loop regularly with a refractometer. Water evaporates, so topping off with premix slowly raises the concentration, while making up spills with plain water dilutes it toward freezing the evaporator. Never use automotive antifreeze; its silicate inhibitors gel on heat transfer surfaces.

An indoor Advantage BG rejects 25-35% more heat into the room than it removes from the process, about 15,000 BTU/hr for every 12,000 BTU/hr of cooling, and moves roughly 1,000 cfm per horsepower. Give it at least 4 ft at the air intake and 6 ft at the exhaust, in a ventilated space where entering air stays between 60°F and 95°F. Fan-condenser models cannot be ducted. Blower models can duct their exhaust outdoors, sized at rated cfm and 0.90 in. of water static pressure, and need a damper assembly where intake air will fall below 60°F.

Advantage's N4 units are rated for entering air from -20°F to 95°F. Allow 4 ft at the air intake and 10 ft at the exhaust. With vertical discharge, keep all sides 4 ft from walls; inside three walls, the top of the unit must be level with or above the walls and clearance grows to 8 ft. Space multiple units 8 ft apart side by side or 3 ft end to end, and never let one unit's discharge feed another's intake. Fences or louvers need 80% free area and 4 ft clearance, and must not be taller than the unit. A low-restriction MERV 2-3 filter keeps debris off the coil.