Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
12/2021 Rev.16
49
C. Check Rated Voltage at Terminal Block for Imbalance before starting of Unit.
❒208/230V 1 Phase ❒208/230V 3 Phase ❒460V 3 Phase
❒380V 3 Phase 50Hz. ❒575 3 Phase 60 Hz.
Measured Line to Line Volts L1&L2_______V. L1&L3 ________V. L2&L3______V.
(L1&L2 + L1&L3 + L2&L3)/3 = Avg. Voltage = _______________
Max. Deviation from avg. voltage = ______________volts
Voltage imbalance = (100 x Max. Deviation)/avg. Voltage = ___________%
A voltage deviation greater than 2% with the unit running should be addressed and corrected. Excess
voltage deviation can cause the compressor to overheat and to operate inefciently.
Example: Maximum Deviation from Average Voltage X 100 (for Percent)
Average voltage
Measured Voltages:
L1 & L2 = 241 Volts
L1 & L3 = 243 Volts = 717 / 3 = 239 Average Voltage
L2 & L3 = 233 Volts
239 - 233 = 6
100 x 6/239 =2.5% Voltage Unbalance
Three phase units only check fan & compressor rotation.
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