Air Handler Engineering
Comprehensive technical specifications for air handler system design and selection.
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Capacity Parameters
- Airflow Rate: 350-450 CFM/ton
- Cooling Capacity: 12000 BTU/ton
- Heating Output: 25-35 BTU/ft²
- Latent Capacity: 20-30% total
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Fan Performance
- Static Pressure: 0.5-1.5 iwc
- Fan Efficiency: 60-75%
- Motor FLA: 1.25 × running
- Tip Speed: 2200-2800 ft/min
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Coil Design
- Face Velocity: 400-500 FPM
- Rows: 3-4 cooling, 2-3 heating
- Fin Density: 10-14 FPI
- ΔT: 20-25°F nominal
System Specifications
Critical operational parameters and requirements:
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Electrical Requirements
- Voltage Range: ±10% nominal
- Phase Balance: ≤2% maximum
- Power Factor: 0.85-0.95
- Overcurrent: 175% FLA
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Cabinet Construction
- Insulation: R-4.2 minimum
- Leakage: Class 2 (≤1%)
- Panel Deflection: L/200
- Access: 24" clearance
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Control Integration
- DDC Points: 12-16 typical
- BACnet: MS/TP or IP
- Response Time: ≤10 seconds
- Trend Storage: 30 days min
Performance Standards
Key metrics for system evaluation and certification:
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Testing Requirements
- Sound Power: NC-35 max
- Vibration: 0.15 in/s peak
- Pressure Test: 2.5× WP
- Leakage: 1% maximum
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Energy Efficiency
- AHRI 430/431 Certified
- Motor: NEMA Premium
- Fan Grade: AMCA Class 1
- COP Range: 3.2-4.0
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Maintenance Metrics
- Filter ΔP: 0.5" initial
- Bearing L10: 200,000 hrs
- Belt Life: 24,000 hrs
- Coil Cleaning: 6-12 months