Choosing the right refrigerated air dryer helps protect tools, extend compressor life, and reduce moisture-related issues in compressed air lines. This guide highlights five top Schulz refrigerated air dryers, each suited for different CFM ranges and compressor sizes. Read on for solid, testable criteria and practical buying considerations to help you select an option that matches your system.
Overview of chosen products:
| Product | Brand | CFM Range | Inlet / Outlet | Dew Point |
|---|---|---|---|---|
| Schulz Refrigerated Air Dryer, 35 CFM | EDGE INDUSTRIAL | 35 CFM | 1/2″ Female NPT | 41°F |
| Schulz Refrigerated Air Dryer, 50 CFM | EDGE INDUSTRIAL | 50 CFM | Not specified (verify kit) | 41°F |
| Schulz Refrigerated Air Dryer, 20 CFM | EDGE INDUSTRIAL | 20 CFM | Not specified (verify kit) | 41°F |
| Schulz Refrigerated Air Dryer, 75 CFM | EDGE INDUSTRIAL | 75 CFM | 1″ Inlet & Outlet | 41°F |
| Schulz Refrigerated Air Dryer, 100 CFM | EDGE INDUSTRIAL | 100 CFM | 1.25″ Inlet & Outlet | 41°F |
Notes: Each entry includes a complete moisture and oil reduction kit option, with pre-filters and stage filters available. Dew point and inlet requirements vary by model; ensure your compressor output does not exceed recommended limits to protect the dryer’s filters.
Schulz 35 CFM Refrigerated Air Dryer (Pre-Filter Kit)
Overview: A non-cycling refrigerated air dryer designed for 35 CFM at 100 psi, paired with an industrial water separator and oil-removing coalescing filter. This kit is suitable for mid-range compressors (7.5–10 hp class). Key notes include a dew point around 41 degrees, max inlet pressure of 200 psi, and a caution to keep the compressor output under 175 psi to protect filters.
- Includes water separator and coalescing filter for moisture and oil removal.
- Inlet/outlet: 1/2″ NPT.
- Review kit options for regulator pre-filter compatibility.
Schulz 50 CFM Refrigerated Air Dryer
Overview: A larger, non-cycling refrigerated air dryer rated at 50 CFM, designed for 10–15 hp class systems. This model stresses the importance of pre-filtering prior to drying to remove water and oil from the piping, with a recommended inclusion of a stage 1 water separator and stage 2 coalescing filter for optimal performance. It’s important to verify the exact inlet/outlet connections for your setup.
- 115V, single-phase operation; compatible with common shop air systems.
- System requires至少 1 micron pre-filter before entering the dryer (kit option available).
- 41°F dew point for effective moisture removal.
Schulz 20 CFM Stand-Alone Refrigerated Dryer
Overview: A compact, stand-alone 20 CFM refrigerated dryer designed for smaller compressors (5 hp class). The model emphasizes that a 1-micron filter is essential before the dryer, with optional pre-filter kit to capture oil and moisture ahead of the dryer. Inlet/outlet configuration and exact wiring should be matched with the system specs.
- 115V, single phase operation; compact footprint for tighter installations.
- Recommended pre-filter and water separator before the dryer.
- 41°F dew point with proper piping protection.
Schulz 75 CFM Refrigerated Air Dryer
Overview: A higher-capacity dryer designed for 15 hp and 20 hp class compressors. This unit includes a regulator, water separator, and oil removal coalescing filter to deliver ultra-dry air. It uses a 1″ NPT inlet/outlet and maintains a 41°F dew point. Ensure your system can handle the 200 psi max inlet and stay within the recommended 175 psi to protect filters.
- High-flow performance suitable for larger shop or light industrial setups.
- Integrated filtration kit options help streamline installation.
- Careful attention to the maximum inlet pressure to protect internal filters.
Schulz 100 CFM Refrigerated Dryer for 20–25 HP
Overview: A high-capacity refrigerated air dryer intended for 100 CFM, designed for heavy-duty industrial applications. Features a 1.25″ inlet/outlet and a robust dew point around 41°F. This model is designed to work with pre-filtered air to maximize dryness and protect downstream equipment. Verification of intake pressure limits (up to 200 psi) and compatibility with system piping is recommended.
- Ideal for large shops or production environments needing ultra-dry air at higher CFM.
- Comprehensive kit options for filtration and moisture removal.
- Important to verify pressure limitations and piping compatibility.
Buying Guide
Key purchase considerations when selecting a refrigerated air dryer for an air compressor:
- CFM compatibility: Match the dryer’s rated CFM to your compressor’s output at typical operating pressure. Oversizing can waste energy; undersizing reduces dryness and may cause downstream moisture issues.
- Dew point requirements: Typical dew points of 41°F are sufficient for most general applications. If your tools are moisture-sensitive, consider a unit with a lower dew point or an integrated filtration kit with staged moisture removal.
- Pre-filter integration: Many dryers perform best when paired with a pre-filter or water separator to remove bulk moisture and oil before reaching the dryer. Ensure your kit includes or can accommodate these components.
- Inlet/outlet sizing: Confirm compatible connections (1/2″, 1″, or larger) and ensure piping can support the flow without excessive pressure drop. Larger models may require additional piping modifications.
- Electrical requirements: Most Schulz units run on 115V single-phase power. Check amperage and panel wiring to ensure safe installation and compliance with electrical codes.
- System pressure: Verify the dryer’s maximum inlet pressure and ensure your compressor output does not exceed this limit, which can damage filters and reduce performance.
- Kit options: Consider whether you need a complete moisture/oil removal kit (stage 1 water separator plus stage 2 coalescing filter) or if you already have compatible components in place.
- Maintenance and replacement parts: Check the availability of replacement filters and demisters, and confirm service intervals recommended by the manufacturer to maintain optimal performance.
- Physical footprint and installation: Larger units demand more space and potentially additional mounting hardware. Plan for clearance for service access and drainage connections.
- Cost of ownership: While upstream costs for filters and kits vary, long-term energy efficiency and reduced moisture-related damage often justify higher upfront investments.