AC Automatic Voltage Regulator

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eng.moh.4u

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Egypt
I need to determine KVA needed by Automatic Voltage Regulator for A/C and details as below:

  • Cooling Capacity= 13500 BTU
  • Voltage = 115 V , 60 HZ
  • COMP RLA = 63 (compressor rated load amps)
  • COMP LRA = 12 (compressor locked rotor amps

I need
Automatic Voltage Regulator cause I have input 220V 60Hz
 
I need to determine KVA needed by Automatic Voltage Regulator for A/C and details as below:

  • Cooling Capacity= 13500 BTU
  • Voltage = 115 V , 60 HZ
  • COMP RLA = 63 (compressor rated load amps)
  • COMP LRA = 12 (compressor locked rotor amps

I need
Automatic Voltage Regulator cause I have input 220V 60Hz

Do you have your amperage ratings reversed?

LRA are usually always higher than RLA
 
A simple step-down transformer is the usual way to go for something like this.
Not a very big one at that if the normal running load is 6A.
A a lot simpler than an AVR.
Unless there's something we haven't been told.............
 
Multiply current rla and voltage. It is about 1.2 KVA. Go for 2KVA transformer to account for voltage drop during LRA
It's 1.4kVA at RLA. The minimum circuit amperage is 20A with a heater. MCA is not a term I would use but I assume it is the minimum design rating for the conductors etc. If so (others feel free to correct me) I think would base the transformer rating on that. So the next standard up from 2300kVA.
A better idea might be to back to the supplier of the aircon equipment if that's possible and ask for their recommendation.
 
It's 1.4kVA at RLA. The minimum circuit amperage is 20A with a heater. MCA is not a term I would use but I assume it is the minimum design rating for the conductors etc. If so (others feel free to correct me) I think would base the transformer rating on that. So the next standard up from 2300kVA.
A better idea might be to back to the supplier of the aircon equipment if that's possible and ask for their recommendation.

Agree. The equipment MCA is 18.6A and you will need more than 2.139kVA for this feed. IMO the next standard up is 3 kVA.
 
Looks like only comp or htg can run, not both
htg is larger
13.2 + 3.4 = 16.6 (mca 1.25 x 13.2 + 3.4 ~20)
115 x 16.6 = 1.9 kva, 2.5 should be fine
 
Looks like only comp or htg can run, not both
htg is larger
13.2 + 3.4 = 16.6 (mca 1.25 x 13.2 + 3.4 ~20)
115 x 16.6 = 1.9 kva, 2.5 should be fine
Then why would there be a higher MCA for the one with the heater?
Wouldn't you rate it to the MCA?
 
Then why would there be a higher MCA for the one with the heater?
Wouldn't you rate it to the MCA?

the actual load is ~ 16.6 A
the conductor ampacity is ~1.25 times that (1.25 x largest load plus the fan)
I'd size for the actual load of 16.6
1.9 kva
a 2.5 gives 30% headroom or an operating point of 76%
 
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