NKV 400х200-4

How to use water heater diagrams:

Air Speed. Starting from 950 m³/h on the air flow scale draw a vertical line ¹ till the air speed axis which makes about  3.35 m/s.

• Supply air temperature. Prolong the line ¹ up to the point where it crosses the outside air temperature (blue curve), e.g. -15°C; then draw a horizontal line ² from this point to the left till  crossing  water in/out temperature curve (70/50 °C). From this point draw a vertical line ³ to the supply air temperature axis on top of the graphic (+29°С).
• Heating coil capacity. Prolong the line ¹ up to the point where it crosses the outside air temperature indicated as red curve (e.g., -15°С) and draw a horizontal line ⁴ from this point to the right to the intersection of water in/out temperature curve (e.g., 70/50 °С). From this point draw a vertical line ⁵ up to the scale of heating coil capacity (16.0 kW).
• Water discharge. Prolong the line ⁵ down to water discharge axis at the bottom of the graphic ⁶ (0.2 l/s).
• Water pressure drop. Draw the line ⁷ from the point where line ⁶ crosses the black curve to the pressure drop axis (2.1 kPa).