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Table 38 – MCA/MOCP DETERMINATION W/ PWRD C.O.
UNIT
V --- PH --- HZ
IFM
TYPE
ELECTRIC HEATER w/ PWRD C.O.
kW FLA
NO P.E. w/ P.E. (pwrd fr/unit)
MCA MOCP
DISC. SIZE
MCA MOCP
DISC. SIZE
FLA LRA FLA LRA
558J*06
208/230---3---60
STD
--- --- 35.3 50 35 162 37.2 50 37 164
4.9/6.5 13.6/15.6 35.3/35.3 50/50 35/35 162/162 37.2/37.2 50/50 37/37 164/164
7.9/10.5 21.9/25.3 39.9/44.1 50/50 37/41 162/162 42.3/46.5 50/ 50 39/43 164/164
12.0/16.0 33.4/38.5 54.3/60.6 60/70 50/56 162/162 56.6/63.0 60/70 52/58 164/164
15.8/21.0 43.8/50.5 67.3/75.6 70/80 62/70 162/162 69.6/78.0 70/80 64/72 164/164
19.9/26.5 55.2/63.8 81.5/92.3 90/100 75/85 162/162 83.9/94.6 90/100 77/87 164/164
MED
--- --- 37.6 50 38 188 39.5 50 40 190
4.9/6.5 13.6/15.6 37.6/37.6 50/50 38/38 188/188 39.5/39.5 50/50 40/40 190/190
7.9/10.5 21.9/25.3 42.8/47.0 50/50 39/43 188/188 45.1/49.4 50/ 50 42/45 190/190
12.0/16.0 33.4/38.5 57.1/63.5 60/70 53/58 188/188 59.5/65.9 60/70 55/61 190/190
15.8/21.0 43.8/50.5 70.1/78.5 80/80 65/72 188/188 72.5/80.9 80/90 67/74 190/190
19.9/26.5 55.2/63.8 84.4/95.1 90/100 78/88 188/188 86.8/97.5 90/100 80/90 190/190
HIGH
--- --- 37.6 50 38 188 39.5 50 40 190
4.9/6.5 13.6/15.6 37.6/37.6 50/50 38/38 188/188 39.5/39.5 50/50 40/40 190/190
7.9/10.5 21.9/25.3 42.8/47.0 50/50 39/43 188/188 45.1/49.4 50/ 50 42/45 190/190
12.0/16.0 33.4/38.5 57.1/63.5 60/70 53/58 188/188 59.5/65.9 60/70 55/61 190/190
15.8/21.0 43.8/50.5 70.1/78.5 80/80 65/72 188/188 72.5/80.9 80/90 67/74 190/190
19.9/26.5 55.2/63.8 84.4/95.1 90/100 78/88 188/188 86.8/97.5 90/100 80/90 190/190
460--- 3 --- 60
STD
--- --- 17.7 25 18 81 18.7 25 19 82
6.0 7.2 17.7 25 18 81 18.7 25 19 82
11.5 13.8 23.3 25 21 81 24.5 25 23 82
14.0 16.8 27.0 30 25 81 28.3 30 26 82
23.0 27.7 40.6 45 37 81 41.9 45 39 82
25.5 30.7 44.4 45 41 81 45.6 50 42 82
MED
--- --- 18.5 25 19 94 19.5 25 20 95
6.0 7.2 18.5 25 19 94 19.5 25 20 95
11.5 13.8 24.3 25 22 94 25.5 30 23 95
14.0 16.8 28.0 30 26 94 29.3 30 27 95
23.0 27.7 41.6 45 38 94 42.9 45 39 95
25.5 30.7 45.4 50 42 94 46.6 50 43 95
HIGH
--- --- 19.5 25 20 103 20.5 30 21 104
6.0 7.2 19.5 25 20 103 20.5 30 21 104
11.5 13.8 25.5 30 23 103 26.8 30 25 104
14.0 16.8 29.3 30 27 103 30.5 35 28 104
23.0 27.7 42.9 45 39 103 44.1 45 41 104
25.5 30.7 46.6 50 43 103 47.9 50 44 104
575--- 3 --- 60
STD --- --- 13.6 20 13 65 15.5 20 16 67
MED --- --- 14.4 20 14 76 16.3 20 17 78
HIGH --- --- 14.4 20 14 76 16.3 20 17 78
LEGEND:
CO --- Convenient outlet
DISC --- Disconnect
FLA --- Full load amps
IFM --- Indoor fan motor
LRA --- Locked rotor amps
MCA --- Mi nimum circuitamps
MOCP --- Maximum over current protection
PE --- Power exhaust
UNPWRD CO --- Unpowered convenientoutlet
NOTES:
1. In compliance with NEC requirements for multimotor and combina-
tion l oa d equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage
is greater than 2%. Use the following formula to determine the
percentage of voltage imbalance.
%VoltageImbalance =100x
max voltage de viationfromaveragevoltage
averagevoltage
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
AverageVoltage =
(224+231 +226)
=
681
3
3
= 227
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v Maximum deviation is 4 v.
(BC) 231 – 227 = 4v Determine percent of voltage imbalance.
%VoltageImbalance =100 x
4
227
=1.76%
This amount of phase imbalance issatisfactory as it is below the maximum
allowable2%.
IMPORTANT: If the supply voltage phaseimbalance is more than 2%, con-
tact your local electric utility company immediately.
558J