Specifications

Armstrong International
IOM-706
Flo-Direct Water Heater
Page 4 of 45
Specifications — Heater
Operational Specifications
Technical Specifications
Specifications
• Flo-Direct water heaters are built to UL standard 795
• May be manufactured to comply with various other electrical or water quality standards
• Three-phase power is required; most available voltages may be accommodated
Materials of Construction
Heater
Component Material
Canister 304 SS (10 ga. ≤ AFD-8000; 3/16 > AFD-8000)
Canister gasket WARCO white (food grade buna rubber)
Flame tube 304 SS
Gas piping Malleable iron with standard yellow finish
Water piping Copper with brass or bronze fittings OR welded SS
Spray ring 304/316 SS
Pall ring 304 SS
Spec English Units SI Units
Gas supply pressure 2–6 psig (optimum 4–5.5 psig) 0.14–0.41 bar (optimum 0.28–0.38 bar)
Water supply pressure 30–100 psig with ± 5 psig variation 2.07–6.84 bar with ± 0.34 bar variation
Inlet water temperature 32 °F to 120 °F 0 °C to 49 °C
Outlet water temperature 185 °F 85 °C
Water temperature differential 10 °F to 140 °F 5.6 °C to 77.8 °C
NOx emission 30–50 ppm
Thermal efficiency 99.7%