Three Phase Heater Calculator
Horizontal or Vertical Discharge Fan Forced Unit Heaters
Heater Specifications
Electric heaters differ from steam or hot water coils in that the heat output is constant as long as the heater is energized. Therefore, sufficient airflow must be provided to prevent overheating and nuisance tripping of the thermal cutouts. The minimum required velocity is determined from Figure 4A or 4B on the basis of entering air temperature and KW per square foot of cross sectional duct area. The maximum air inlet temperature for open coil heaters is 100°F (38°C) and for finned tubular heaters is 80°F (27°C).
Note: The hashtag (#) symbol on a cell title indicates additional information is available, access it by clicking on the hashtag.
Heater Table
| Input Type | Input Unit | Output |
|---|---|---|
| Heater Voltage (#) | ||
| Heater kW (#) | ||
| Heater Mounting |
Heater Calculation Tables
| Input Unit | Output |
|---|---|
| Heater kVA | |
| Control Voltage | |
| Fan Motor Voltage | |
| Heater Amps | |
| Fan Motor HP | |
| Fan Motor RPM |
Nema Starter
| Input Type | NEMA Size |
|---|---|
| Full Volt |
Circuit Protection
| Fuse Size | Circuit Breaker | Fuse 125% of Total Circuit Amps | Breaker 125% of Total Circuit Amps |
|---|---|---|
