Electrical Wiring
48 Outdoor Unit
Notes:
1. Voltage range
Voltage supplied to the unit terminals should be within the min-
imum and maximum range
2. Maximum allowable voltage unbalance between phase is 2 %
3. MCA / MOP
MCA = (1.25 x Load1) + Load2
MOP = (2.25 x Load1) + Load2
- Load1 : Rated running current of largest motor
(Compressor or other motor)
- Load2 : any other load rated 1.0A or more
4. Select wire spec. based on the MCA
5. Select proper circuit breaker as given below
MCA < Selected circuit breaker ≤ MOP
6. Recommended circuit breaker is ELCB (Earth Leakage Circuit
Breaker)
7.
MSC & RLA are measured as the compressor only test
condition.
8. MSC values
16.5/75 : MSC of (INV. Comp) / (Const. Comp.1)
9. RLA is measured during each individual compressor test con-
dition.
14.5/12.0 : RLA of (INV. Comp) / (Const. Comp.1)
10. OFM is measured as the outdoor unit test condition
(Example)
Selection of proper circuit breaker
➀
10HP- Rated running current : 18.0 A
➁
MCA = (1.25 x Load1) + Load2
= (1.25 x 18.0) + 3.97 = 26.5 A
➂
MOP = (2.25 x Load1) + Load2
= (2.25 x 18.0) + 3.97 = 44.5 A
➔
Finally select circuit breaker 40A
MCA : Minimum Circuit Amperes (A)
MOP : Maximum rating Over current Protective device
MSC : Maximum Starting Current
RLA : Rated Load Amperes (A)
OFM : Outdoor Fan Motor
kW : Fan Motor rated output (kW)
FLA : Full Load Amperes (A)
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