EE_Intern_2
Member
I have two questions.
Question 1. I have seen two different sets of formulas for calculating MCA and MOCP for HVAC equipment (compressor motor 16Amps RLA, condenser fan motor 3.0 A RLA, and supply & exhaust fan motor 2.8A RLA). Which set of equations below is the correct set?
MCA = 1.25 * largest motor load + all other motor loads
MCA = 1.75 * largest motor load + all other motor loads
MOCP = 1.75 * largest motor load + all other motor loads
MOCP = 2.25 * largest motor load + all other motor loads
Question 2.
I can have a 26KW electric heater that draws 76A added as an option to the above HVAC unit.
How can my heater Overcurrent protection device for the heater be larger than the Maximum over current protection for the HVAC motors when they are the same unit?
are the heater and compressor motors on separate breakers?
Thanks
Question 1. I have seen two different sets of formulas for calculating MCA and MOCP for HVAC equipment (compressor motor 16Amps RLA, condenser fan motor 3.0 A RLA, and supply & exhaust fan motor 2.8A RLA). Which set of equations below is the correct set?
MCA = 1.25 * largest motor load + all other motor loads
MCA = 1.75 * largest motor load + all other motor loads
MOCP = 1.75 * largest motor load + all other motor loads
MOCP = 2.25 * largest motor load + all other motor loads
Question 2.
I can have a 26KW electric heater that draws 76A added as an option to the above HVAC unit.
How can my heater Overcurrent protection device for the heater be larger than the Maximum over current protection for the HVAC motors when they are the same unit?
are the heater and compressor motors on separate breakers?
Thanks