Description
The Caleffi 551007A Discal Air Separator is a high-performance inline air elimination device engineered for closed-loop hydronic heating and cooling systems. Featuring a 1-1/4″ NPT connection, this compact separator uses Caleffi’s proven disc-stack technology to capture and remove both free and dissolved air from circulating system water — protecting pumps, boilers, and heat emitters from the damaging effects of air entrainment.
How It Works
The Discal’s internal disc stack creates a low-velocity zone within the separator body. As system water passes through, air bubbles — even micro-bubbles — are drawn to the disc surfaces, coalesce into larger bubbles, and rise to the top of the unit where they are automatically vented through the integrated automatic air vent. This continuous, passive process keeps the system air-free without requiring manual intervention.
Key Features
- 1-1/4″ NPT inline connections for straightforward installation in new or retrofit hydronic piping
- Internal disc-stack technology for efficient capture of both macro-bubbles and micro-bubbles
- Integrated automatic air vent for continuous, hands-free air discharge
- Compact, space-saving body suitable for tight mechanical room installations
- High-quality brass and stainless steel internal construction for long service life
- Compatible with hydronic heating, radiant floor, chilled water, and closed-loop cooling systems
- Caleffi DISCAL series — a trusted standard in hydronic air elimination
Benefits
- Eliminates noisy, air-bound piping and heat emitters
- Protects circulator pumps from cavitation and premature wear
- Improves system efficiency by maintaining full water flow through all circuits
- Reduces corrosion caused by oxygen-laden water
- Minimizes maintenance callbacks related to air-related system problems
Typical Applications
- Residential and light commercial hydronic heating systems
- Radiant floor heating and cooling installations
- Chilled water fan coil systems
- Boiler primary/secondary loop piping
- Closed-loop geothermal systems
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