Hubbell TX - Page 8

8
Tankless High Flow Pressure Drop Chart (HX):
Wattage De-rating Formula:
Applied Voltage
2
× Rated Wattage = Actual Wattage
Rated Voltage
2
For example: If installing a 27 kW unit when actual voltage is 212 V,
212
2
=
44,944
= 0.78 × 27,000 W = 21,060 W @ 212 V
240
2
57,600
Amperage Formula:
Watts
= Amps (Single Phase)
Watts
÷1.73 = Amps (3-Phase)
Volts Volts
Flow Rate Formulas:
To determine power (kW) requirement
____GPM × ____ °F ΔT × 0.1465 = ____ kW
To determine temperature rise
____ kW × 6.824 ÷ ____ GPM = ____°F ΔT
To determine flow rate
____ kW × 6.824 ÷ ____ °FΔT = ____ GPM