{"product_id":"castair-rd59-11k-refrigerated-air-dryer-115-1-60v-59cfm-37-f-3-4npt-in-out-connections-rd59-11k","title":"Castair RD59-11K Refrigerated Air Dryer 115\/1\/60V 59CFM@37°F 3\/4\"NPT In\/Out Connections RD59-11K","description":"\u003cp\u003eThe Castair RD59-11K is a refrigerated compressed air dryer rated at 59 CFM at a 37°F pressure dew point. This is the dryer for shops running a 10–15 HP compressor — a busy automotive shop, a body shop with multiple spray guns, a small production floor, or any application where the compressor is producing 40–60 CFM and moisture in the air is a real problem. At 73 lbs with 3\/4\" NPT connections, it installs into existing air systems without requiring larger plumbing.\u003c\/p\u003e\n\n\u003cp\u003eThe RD59-11K uses R134a or R407c refrigerant — the same environmentally compliant refrigerant used across the Castair dryer line — to chill compressed air to a 37°F dew point. Water vapor condenses out and gets ejected by the automatic demand drain. The result is dry, consistent air at every tool, booth, and pneumatic device in your shop.\u003c\/p\u003e\n\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefrigeration cycle:\u003c\/strong\u003e Compressed air enters the stainless steel heat exchanger where Freon refrigerant removes heat and condenses moisture. Air exits cold and dry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-function single-body heat exchanger:\u003c\/strong\u003e Pre-cools hot incoming air with cold outgoing air, reducing refrigerant load and improving energy efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic demand drain:\u003c\/strong\u003e Cycles only when condensate is present, conserving compressed air. No timer-based drain losses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew point indicator:\u003c\/strong\u003e Simple visual confirmation — no computer logic, no programming required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated capacity:\u003c\/strong\u003e 59 CFM at 37°F dew point (65 CFM at 50°F dew point)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e 3\/4\" NPT inlet and outlet — same size as the smaller RD25-6K, direct retrofit upgrade\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 115V \/ 1-phase \/ 60Hz with 9-foot three-prong power cord\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent draw:\u003c\/strong\u003e 6.5 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefrigerant:\u003c\/strong\u003e R134a \/ R407c\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum inlet pressure:\u003c\/strong\u003e 232 PSIG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat exchanger:\u003c\/strong\u003e Stainless steel for corrosion resistance and long service life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick connect:\u003c\/strong\u003e Refrigerant recharge port for field service\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e UL listed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 73 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W×D×H):\u003c\/strong\u003e 10.6\" × 19.1\" × 22.4\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCastair RD59-11K refrigerated air dryer unit\u003c\/li\u003e\n\u003cli\u003e9-foot three-prong 115V power cord (pre-installed)\u003c\/li\u003e\n\u003cli\u003eRefrigerant pre-charged at the factory (R134a\/R407c)\u003c\/li\u003e\n\u003cli\u003e3\/4\" NPT inlet\/outlet connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: A properly sized pre-filter is required for warranty. A Castair 3\/4\" particulate filter (C-FS34) upstream of the dryer is recommended. The Castair #DM75 mount kit is compatible with the RD59-11K and includes a 3\/4\" NPT 3-ball valve bypass, metal flex hose, and vibration pads for direct compressor mounting.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eAvailable Configurations \/ Upgrade Path\u003c\/h2\u003e\n\u003cp\u003eThe RD59-11K sits in the middle of the Castair refrigerated dryer lineup. All models run on 115V\/1-phase\/60Hz:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRD25-6K — 25 CFM @ 37°F:\u003c\/strong\u003e For 5–7.5 HP compressors. 57 lbs, 10.6\" × 17.9\" × 19.6\". Step down if your compressor produces 25 CFM or less.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRD59-11K — 59 CFM @ 37°F:\u003c\/strong\u003e This unit. For 10–15 HP compressors. 73 lbs, 10.6\" × 19.1\" × 22.4\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRD71-15K — 71 CFM @ 37°F:\u003c\/strong\u003e Next step up. For 15–20 HP compressors. Upgrades to 1\" NPT connections, 110 lbs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRD113-60K — 107 CFM @ 37°F:\u003c\/strong\u003e For larger systems. 1\" NPT, 119 lbs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRD161-37K — 161 CFM @ 37°F:\u003c\/strong\u003e For high-demand shops. 1-1\/2\" NPT, 137 lbs.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eLarger sizes available — call for pricing.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This vs. Stepping Up or Down\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe RD59-11K is right for your shop if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour compressor is in the 10–15 HP range producing 40–59 CFM\u003c\/li\u003e\n\u003cli\u003eYou are running multiple air tools simultaneously or a paint booth with a secondary tool\u003c\/li\u003e\n\u003cli\u003eYour existing air lines are plumbed 3\/4\" and you want a direct-swap upgrade from a smaller dryer\u003c\/li\u003e\n\u003cli\u003eYou have standard 115V single-phase power only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStep up to the RD71-15K if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour compressor is 15 HP or larger and produces more than 60 CFM peak demand\u003c\/li\u003e\n\u003cli\u003eYou are expanding your shop with additional bays or a second spray booth\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCapacity note:\u003c\/strong\u003e Ratings are based on 100°F inlet air, 100°F ambient, 100 PSI. At 150°F inlet air temperature, effective capacity drops to 55% of rated — approximately 32 CFM for this unit. If your compressor does not have an aftercooler, install one before the dryer inlet to protect dryer performance and capacity.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e RD59-11K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 37°F dew point:\u003c\/strong\u003e 59\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 50°F dew point:\u003c\/strong\u003e 65\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet\/Outlet Connection:\u003c\/strong\u003e 3\/4\" NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage \/ Phase \/ Hz:\u003c\/strong\u003e 115V \/ 1-phase \/ 60Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 6.5 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefrigerant:\u003c\/strong\u003e R134a \/ R407c\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Inlet Pressure:\u003c\/strong\u003e 232 PSIG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Dew Point:\u003c\/strong\u003e 37°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger:\u003c\/strong\u003e Stainless steel, dual-function single body\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrain Type:\u003c\/strong\u003e Automatic, demand-based\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Cord:\u003c\/strong\u003e 9 ft, three-prong 115V plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 73 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W×D×H):\u003c\/strong\u003e 10.6\" × 19.1\" × 22.4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e UL Listed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe specialize in compressed air equipment and have since 2016. When you call, we can help you confirm the right dryer size for your compressor output, advise on pre-filter requirements, and walk through installation options. Free shipping on qualifying orders, free pre-sale technical support, and full Castair manufacturer warranty on every unit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342589878485,"sku":"RD59-11K","price":3136.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/REFRIGERATED-COMPRESSED-AIR-DRYERS_d52k5k.jpg?v=1772652867","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-rd59-11k-refrigerated-air-dryer-115-1-60v-59cfm-37-f-3-4npt-in-out-connections-rd59-11k","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}