ABAC COOL 75 Refrigerated Air Dryer - 115V Single-Phase, 232 PSI Max, R-134a

The ABAC COOL 75 is a refrigerated air dryer that pulls moisture out of compressed air before it reaches your tools, air lines, and finishing work. It runs on standard 115V 60 Hz shop power, so it sets up next to a single-phase compressor without new wiring. Maximum working pressure is 232 PSI, which covers every reciprocating and rotary screw compressor in the ABAC range. COOL 75 is carried as code C5 in the COOL 15-100 UL manual, one step up from the COOL 65, and it is the first size in that range to move from 1/2 in NPT to 3/4 in NPT connections.

Key specifications

• Model: COOL 75 (code C5)
• Part number: 4102006317
• Type: refrigerated compressed air dryer, hot gas bypass design
• Power supply: 115V, 60 Hz, single phase
• Nominal power: 366 W at 60 Hz (320 W refrigeration compressor plus 46 W fan)
• Maximum working pressure: 232 PSI (16 bar)
• Inlet and outlet connections: 3/4 in NPT
• Refrigerant: R-134a, 0.77 lb (0.350 kg) charge
• Rated pressure dew point: 45 F (7 C), the figure ABAC quotes across the COOL range
• Reference conditions: 100 PSI operating pressure, 95 F inlet air, 77 F room
• Incoming air temperature: 50 F to 122 F (10 C to 50 C)
• Operating room temperature: 41 F to 104 F (5 C to 40 C)
• Condensate removal: automatic timer drain
• Monitoring: front panel pressure dew point indicator with green target zone and main on and off switch
• Weight: 59 lb (27 kg)
• Dimensions (L x W x H): 9.2 x 21.6 x 22 in (233 x 550 x 560 mm)
• Brand: ABAC, part of the Atlas Copco group

Typical applications

ABAC lists the COOL range for pneumatic tools and equipment, pneumatic control systems, painting applications, packaging, injection molding, car shops and tire inflation. In practice that means paint and body shops, cabinet and woodworking shops, small production cells, laser and plasma tables: anywhere water in the air line is blowing out finishes, rusting tools and fittings, or freezing an outdoor drop in winter. A refrigerated dryer chills the compressed air so the water condenses, drains it away, and sends dry air down the line, which is the most straightforward way to stop moisture damage downstream of a compressor. ABAC notes that a 45 F pressure dew point covers more than 95 percent of industrial compressed air applications, which is why refrigeration is the default dryer technology rather than desiccant.

How the COOL range works

The COOL 75 is a direct expansion chiller built around a combined air to air and air to refrigerant heat exchanger with an integrated water separator, so the water that comes out of the air is separated and dumped rather than carried down the pipe. On the refrigerant side a capillary tube drops the pressure and temperature of the refrigerant to do the cooling, and a refrigerant filter ahead of it keeps debris out of that capillary. The refrigerant compressor is driven by an electric motor, cooled by the refrigerant itself and protected against thermal overload, and the condenser is air cooled with a large exchange surface.

The part that matters day to day is the hot gas bypass valve. It injects hot gas from the compressor discharge into the suction side, which holds refrigeration capacity steady across load conditions and keeps evaporator pressure constant so the evaporator cannot freeze when the shop goes quiet. A timer drain clears the condensate on its own, and the front panel dew point indicator with its green target zone lets you read air quality at a glance instead of guessing.

Service and running cost

The COOL 75 carries a small sealed R-134a circuit of 0.77 lb and draws 366 W at 60 Hz, which is 320 W for the refrigeration compressor and 46 W for the condenser fan. At that draw it costs very little to leave running alongside the compressor, and there is no desiccant to replace and no purge air lost to regeneration, which is the running cost that separates a refrigerated dryer from a desiccant one. Routine upkeep is keeping the air cooled condenser clear of dust so it can reject heat, checking that the timer drain is actually discharging, and leaving clearance around the cabinet for airflow. The hot gas bypass valve is factory set and is not a field adjustment, so a dew point reading outside its normal band usually points to a dirty condenser, a hot room, or incoming air above the 122 F limit rather than to the valve.

Sizing and installation

Size the dryer to the compressor it follows, not to the pipe it bolts into. Step up to the COOL 75 when a COOL 65 is running at its limit, and move to the 230V COOL 100 if the compressor behind it is larger again. The 3/4 in NPT ports are the practical reason to choose the COOL 75 over a COOL 65, because a 1/2 in tie-in starts to throttle flow on a shop main. Undersizing is the usual reason a dryer disappoints, so leave headroom rather than matching a rating exactly.

ABAC rates the COOL range at reference conditions and publishes correction factors because real conditions move the number, as K = A x B x C. Room temperature sets A: 1.00 at 77 F, 0.92 at 86 F, 0.84 at 95 F and 0.80 at 104 F. Inlet air temperature sets B and moves hardest: 1.24 at 86 F, 1.00 at 95 F, 0.82 at 104 F, 0.69 at 113 F and 0.54 at 122 F. Line pressure sets C and works the other way: 0.90 at 72 PSI, 1.00 at 101 PSI, 1.08 at 145 PSI and 1.17 at 232 PSI. The short version is that hot incoming air costs you far more capacity than a hot room does, so if the dryer has to live near the compressor, fit an aftercooler ahead of it rather than oversizing the dryer to cover the heat.

At 59 lb the COOL 75 still fits a bench or a wall shelf rather than claiming floor space, and it shares the 9.2 x 21.6 x 22 in cabinet used across the 115V COOL sizes. The 232 PSI rating means the dryer will not be the weak link behind a 175 PSI two stage reciprocating machine. Give it a dry, well ventilated spot between 41 F and 104 F and keep incoming air between 50 F and 122 F.

Pair it with a coalescing filter upstream for oil carryover and a particulate filter downstream when your work calls for cleaner air, and give the condensate somewhere to go. See the rest of the refrigerated air dryer range and our full air dryers lineup, or the rotary screw air compressors and piston air compressors this dryer is most often paired with. Call us for the COOL 75 flow rating against your own compressor output and duty cycle before you pipe it in.