Electric heater selection table — S-VAV-SE / S-VAV-SP
Single-duct VAV boxes with electric (S-VAV-SE) or PTC (S-VAV-SP) reheat: capacity, current and leaving-air temperature (LAT) by heating airflow for each size. Same table as in the S-VAV-SW / SE / SP catalogue.
Electric / PTC heater selection
Calculated – not testedThree standard options per size. LAT at EAT 13 °C for heating airflow = 30 / 50 / 80 % of rated airflow. Q min: 0.5 m/s across the A × B section (airflow-switch setting); below it the heater is disabled. Current: 1-phase 230 V / 3-phase 400 V.
| Size Rated Q m³/h | Q min m³/h | Option | kW | A (1-ph / 3-ph) | LAT °C at 30 / 50 / 80 % of rated Q | ΔP E / P, Pa | ||
|---|---|---|---|---|---|---|---|---|
| 30 % | 50 % | 80 % | ||||||
| 4″ 255 m³/h | 93 | 1x1.5 | 1.5 | 6.5 / 2.2 | 71.5 | 48.1 | 34.9 | 1.1 / 2.8 |
| 2x1.5 | 3.0 | 13.0 / 4.3 | 130.0 | 83.2 | 56.9 | |||
| 2x3 | 6.0 | 26.1 / 8.7 | 247.0 | 153.4 | 100.8 | |||
| 5″ 425 m³/h | 93 | 1x1.5 | 1.5 | 6.5 / 2.2 | 48.1 | 34.1 | 26.2 | 3.1 / 7.9 |
| 2x1.5 | 3.0 | 13.0 / 4.3 | 83.2 | 55.1 | 39.3 | |||
| 2x3 | 6.0 | 26.1 / 8.7 | 153.4 | 97.2 | 65.7 | |||
| 6″ 680 m³/h | 93 | 1x1.5 | 1.5 | 6.5 / 2.2 | 34.9 | 26.2 | 21.2 | 8.0 / 20 |
| 2x1.5 | 3.0 | 13.0 / 4.3 | 56.9 | 39.3 | 29.5 | |||
| 2x3 | 6.0 | 26.1 / 8.7 | 100.8 | 65.7 | 45.9 | |||
| 7″ * 934 m³/h | 128 | 1x2.5 | 2.5 | 10.9 / 3.6 | 39.6 | 29.0 | 23.0 | 8.0 / 20 |
| 2x2.5 | 5.0 | 21.7 / 7.2 | 66.2 | 44.9 | 32.9 | |||
| 2x5 | 10.0 | 43.5 / 14.4 | 119.4 | 76.8 | 52.9 | |||
| 8″ 1189 m³/h | 128 | 1x2.5 | 2.5 | 10.9 / 3.6 | 33.9 | 25.5 | 20.8 | 13 / 33 |
| 2x2.5 | 5.0 | 21.7 / 7.2 | 54.8 | 38.1 | 28.7 | |||
| 2x5 | 10.0 | 43.5 / 14.4 | 96.6 | 63.1 | 44.3 | |||
| 9″ * 1529 m³/h | 195 | 1x2.5 | 2.5 | 10.9 / 3.6 | 29.3 | 22.8 | 19.1 | 9.2 / 23 |
| 2x2.5 | 5.0 | 21.7 / 7.2 | 45.5 | 32.5 | 25.2 | |||
| 2x5 | 10.0 | 43.5 / 14.4 | 78.0 | 52.0 | 37.4 | |||
| 10″ 1869 m³/h | 195 | 1x3 | 3.0 | 13.0 / 4.3 | 29.0 | 22.6 | 19.0 | 14 / 34 |
| 2x3 | 6.0 | 26.1 / 8.7 | 44.9 | 32.1 | 25.0 | |||
| 2x6 | 12.0 | 52.2 / 17.3 | 76.8 | 51.3 | 36.9 | |||
| 12″ 2718 m³/h | 277 | 1x3 | 3.0 | 13.0 / 4.3 | 24.0 | 19.6 | 17.1 | 14 / 36 |
| 2x3 | 6.0 | 26.1 / 8.7 | 34.9 | 26.2 | 21.2 | |||
| 2x6 | 12.0 | 52.2 / 17.3 | 56.9 | 39.3 | 29.5 | |||
| 14″ 3568 m³/h | 397 | 1x5 | 5.0 | 21.7 / 7.2 | 26.9 | 21.4 | 18.2 | 12 / 30 |
| 2x5 | 10.0 | 43.5 / 14.4 | 40.9 | 29.7 | 23.4 | |||
| 2x10 | 20.0 | 87.0 / 28.9 | 68.7 | 46.4 | 33.9 | |||
| 16″ * 4757 m³/h | 480 | 1x5 | 5.0 | 21.7 / 7.2 | 23.4 | 19.3 | 16.9 | 15 / 37 |
| 2x5 | 10.0 | 43.5 / 14.4 | 33.9 | 25.5 | 20.8 | |||
| 2x10 | 20.0 | 87.0 / 28.9 | 54.8 | 38.1 | 28.7 | |||
LAT > 32 °C Not allowed (LAT > 50 °C or below Q min)
* sizes 7″, 9″ interpolated, 16″ extrapolated in the S-VAV-S data
Orange: LAT > 32 °C (above the ASHRAE 62.1 recommendation for ceiling supply); red: LAT > 50 °C or airflow below Q min — not allowed, choose a smaller option or raise the heating airflow. High-limit cut-out at 60 °C. Supply: ≤ 4.5 kW single-phase, above three-phase.
Calculated with engine vav-rh@1 (S-VAV-S box data measured by Intertek; the reheat section is not tested). Rated Q = the anchor airflow of each size in the S-VAV-S catalogue.
Fan-powered boxes with electric heat (S-VAV-PFE): the entering air is mixed air — select them in the VAV quick selector.
