The Castair RDD50 is a refrigerated compressed air dryer from Castair's RDD series. The RDD50 designation places this unit above the RDD40 series — it is a higher-capacity or upgraded-specification dryer for compressed air systems that exceed what the RDD40 line is rated for. Castair's RDD series refrigerated dryers maintain a 37°F pressure dew point, using R134a or R407c refrigerant and a stainless steel heat exchanger to condense and remove water vapor from compressed air before it reaches tools, equipment, and piping.
If you are sourcing the RDD50 as a replacement for an existing unit or as an addition to a growing shop air system, call us at 866-217-0063. We can confirm the exact CFM capacity, electrical specifications, connection sizes, and physical dimensions for the RDD50 before you order. The RDD50 is not published in Castair's standard product table; full specifications require direct confirmation.
Key Features — Castair RDD50
- Pressure dew point: 37°F — standard for shop and industrial compressed air drying
- Refrigerant: R134a or R407c (environmentally compliant)
- Heat exchanger: Stainless steel, dual-function single-body — pre-cools incoming hot air with outgoing cold dry air
- Automatic demand drain: Ejects condensate only when liquid is present — no fixed-timer air waste
- Dew point indicator: Simple visual confirmation — no computer logic, no programming
- Quick-connect refrigerant port: Field recharge capability without full disassembly
- Maximum inlet pressure: 232 PSIG
- Certifications: UL listed
What's in the Box
- Castair RDD50 refrigerated compressed air dryer unit
- Power cord
- Refrigerant pre-charged at factory (R134a/R407c)
A properly sized pre-filter upstream of the dryer inlet is required for warranty coverage. Contact us for filter specification recommendations for your installation.
Castair RDD Series Lineup Context
The Castair RDD series dryers are separate from the RD series (RD25-6K through RD161-37K). For reference:
- RDD40 series: RDD40.016, RDD40.030, RDD40.060 — lower-capacity RDD dryers
- RDD50: This unit — mid-range RDD series dryer
- RDD80 series: RDD80.060 — higher-capacity RDD dryer
Call 866-217-0063 to confirm which RDD model is appropriate for your compressor output and air demand.
When You Need a Refrigerated Dryer
Moisture in compressed air is a maintenance cost that compounds over time. Without a refrigerated dryer:
- Air tools rust internally and fail early — bearings, vanes, and O-rings corrode
- Spray guns spit water into paint finishes, causing fish-eyes and adhesion failures
- Pneumatic cylinders and solenoid valves corrode and stick
- Air distribution piping rusts from the inside — particulates end up at your tools
- Air dryer systems (desiccant towers, coalescing filters) saturate faster and cost more to maintain
Castair's data indicates a properly installed refrigerated dryer reduces air system maintenance costs and downtime by 15–25%.
Technical Specifications
- Part Number: RDD50
- Series: Castair RDD50 refrigerated dryer
- Pressure Dew Point: 37°F
- Maximum Inlet Pressure: 232 PSIG
- Refrigerant: R134a / R407c
- Drain: Automatic, demand-based
- CFM capacity, voltage, amperage, connection size, weight, dimensions: Contact us for full specifications — 866-217-0063
- Certifications: UL Listed
Why Buy From Air Compressor Factory Direct?
We specialize in Castair compressed air equipment and have since 2016. For RDD series dryers with specifications not fully published online, we can confirm the exact capacity and requirements before you order. Free shipping on qualifying orders, free pre-sale technical support, full Castair manufacturer warranty.
Call 866-217-0063 for quick answers and help!
