39
Table 35 – MCA/MOCP DETERMINATION W/ PWRD C.O.
UNIT
V --- P H --- H Z
IFM
TYPE
ELECTRIC HEATER NO C.O. or UNPWRD 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*07
208/230---3--- 60
STD
--- --- 30.5 45 30 157 32.4 50 32 159
4.9/6.5 13.6/15.6 30.5/30.5 45/45 30/30 157/157 32.4/32.4 50/50 32/32 159/159
7.9/10.5 21.9/25.3 33.9/38.1 45/45 31/35 157/157 36.3/40.5 50/50 33/37 159/159
12.0/16.0 33.4/38.5 48.3/54.6 50/60 44/50 157/157 50.6/57.0 60/60 47/52 159/159
15.8/21.0 43.8/50.5 61.3/69.6 70/70 56/64 157/157 63.6/72.0 70/80 59/66 159/159
19.9/26.5 55.2/63.8 75.5/86.3 80/90 69/79 157/157 77.9/88.6 80/90 72/82 159/159
MED
--- --- 32.8 50 32 183 34.7 50 34 185
4.9/6.5 13.6/15.6 32.8/32.8 50/50 32/32 183/183 34.7/34.7 50/50 34/34 185/185
7.9/10.5 21.9/25.3 36.8/41.0 50/50 34/38 183/183 39.1/43.4 50/50 36/40 185/185
12.0/16.0 33.4/38.5 51.1/57.5 60/60 47/53 183/183 53.5/59.9 60/60 49/55 185/185
15.8/21.0 43.8/50.5 64.1/72.5 70/80 59/67 183/183 66.5/74.9 70/80 61/69 185/185
19.9/26.5 55.2/63.8 78.4/89.1 80/90 72/82 183/183 80.8/91.5 90/100 74/84 185/185
HIGH
--- --- 32.8 50 32 183 34.7 50 34 185
4.9/6.5 13.6/15.6 32.8/32.8 50/50 32/32 183/183 34.7/34.7 50/50 34/34 185/185
7.9/10.5 21.9/25.3 36.8/41.0 50/50 34/38 183/183 39.1/43.4 50/50 36/40 185/185
12.0/16.0 33.4/38.5 51.1/57.5 60/60 47/53 183/183 53.5/59.9 60/60 49/55 185/185
15.8/21.0 43.8/50.5 64.1/72.5 70/80 59/67 183/183 66.5/74.9 70/80 61/69 185/185
19.9/26.5 55.2/63.8 78.4/89.1 80/90 72/82 183/183 80.8/91.5 90/100 74/84 185/185
4 6 0 --- 3 --- 6 0
STD
--- --- 15.5 25 15 79 16.5 25 16 80
6.0 7.2 15.5 25 15 79 16.5 25 16 80
11.5 13.8 20.5 25 19 79 21.8 25 20 80
14.0 16.8 24.3 25 22 79 25.5 30 23 80
23.0 27.7 37.9 40 35 79 39.1 40 36 80
25.5 30.7 41.6 45 38 79 42.9 45 39 80
MED
--- --- 16.3 25 16 92 17.3 25 17 93
6.0 7.2 16.3 25 16 92 17.3 25 17 93
11.5 13.8 21.5 25 20 92 22.8 25 21 93
14.0 16.8 25.3 30 23 92 26.5 30 24 93
23.0 27.7 38.9 40 36 92 40.1 45 37 93
25.5 30.7 42.6 45 39 92 43.9 45 40 93
HIGH
--- --- 17.3 25 17 101 18.3 25 18 102
6.0 7.2 17.3 25 17 101 18.3 25 18 102
11.5 13.8 22.8 25 21 101 24.0 25 22 102
14.0 16.8 26.5 30 24 101 27.8 30 26 102
23.0 27.7 40.1 45 37 101 41.4 45 38 102
25.5 30.7 43.9 45 40 101 45.1 50 42 102
5 7 5 --- 3 --- 6 0
STD --- --- 11.9 15 12 63 13.8 20 14 65
MED --- --- 12.7 20 12 74 14.6 20 15 76
HIGH --- --- 12.7 20 12 74 14.6 20 15 76
LEGEND:
CO --- Convenient outlet
DISC --- Disconnect
FLA --- Full load amps
IFM --- Indoor fan motor
LRA --- Locked rotor amps
MCA --- Minimum circuit amps
MOCP --- Maximum over current protection
P E --- Po w e r e x h a u st
UNPWRD CO --- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for mu ltimotor 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.
% Voltage Imbalance = 100 x
max voltage de viation from average voltage
average voltage
Example: Su pply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
(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 = 4 v Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
4
227
= 1.76%
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
IMPORTANT: If the supply vol tage phase imbalance is more than 2%, con-
tact your local electric utility company immediately.
558J
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