36
Table 32 – MCA/MOCP DETERMINATION NO C.O. OR UNPWRD 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*04
208/230---1--- 60
STD
--- --- 27.2 40 26 95 29.1 45 29 97
3.3/4.4 15.9/18.3 27.2/29.0 40/40 26/27 95/95 29.1/31.4 45/45 29/29 97/97
4.9/6.5 23.5/27.1 35.5/40.0 40/45 33/37 95/95 37.9/42.4 45/45 35/39 97/97
6.5/8.7 31.4/36.3 45.4/51.5 50/60 42/47 95/95 47.8/53.9 50/60 44/50 97/97
7.9/10.5 37.9/43.8 53.5/60.9 60/70 49/56 95/95 55.9/63.3 60/70 51/58 97/97
9.8/13.0 46.9/54.2 64.8/73.9 70/80 60/68 95/95 67.1/76.3 70/80 62/70 97/97
MED
--- --- 27.2 40 26 95 29.1 45 29 97
3.3/4.4 15.9/18.3 27.2/29.0 40/40 26/27 95/95 29.1/31.4 45/45 29/29 97/97
4.9/6.5 23.5/27.1 35.5/40.0 40/45 33/37 95/95 37.9/42.4 45/45 35/39 97/97
6.5/8.7 31.4/36.3 45.4/51.5 50/60 42/47 95/95 47.8/53.9 50/60 44/50 97/97
7.9/10.5 37.9/43.8 53.5/60.9 60/70 49/56 95/95 55.9/63.3 60/70 51/58 97/97
9.8/13.0 46.9/54.2 64.8/73.9 70/80 60/68 95/95 67.1/76.3 70/80 62/70 97/97
208/230---3--- 60
STD
--- --- 19.4 25 19 89 21.3 30 22 91
3.3/4.4 9.2/10.6 19.4/19.4 25/25 19/19 89/89 21.3/21.8 30/30 22/22 91/91
4.9/6.5 13.6/15.6 23.1/25.6 25/30 21/24 89/89 25.5/28.0 30/30 23/26 91/91
6.5/8.7 18.1/20.9 28.8/32.3 30/35 26/30 89/89 31.1/34.6 35/35 29/32 91/91
7.9/10.5 21.9/25.3 33.5/37.8 35/40 31/35 89/89 35.9/40.1 40/45 33/37 91/91
12.0/16.0 33.4/38.5 47.9/54.3 50/60 44/50 89/89 50.3/56.6 60/60 46/52 91/91
MED
--- --- 19.4 25 19 89 21.3 30 22 91
3.3/4.4 9.2/10.6 19.4/19.4 25/25 19/19 89/89 21.3/21.8 30/30 22/22 91/91
4.9/6.5 13.6/15.6 23.1/25.6 25/30 21/24 89/89 25.5/28.0 30/30 23/26 91/91
6.5/8.7 18.1/20.9 28.8/32.3 30/35 26/30 89/89 31.1/34.6 35/35 29/32 91/91
7.9/10.5 21.9/25.3 33.5/37.8 35/40 31/35 89/89 35.9/40.1 40/45 33/37 91/91
12.0/16.0 33.4/38.5 47.9/54.3 50/60 44/50 89/89 50.3/56.6 60/60 46/52 91/91
HIGH
--- --- 19.7 30 20 107 21.6 30 22 109
3.3/4.4 9.2/10.6 19.7/19.8 30/30 20/20 107/107 21.6/22.1 30/30 22/22 109/109
4.9/6.5 13.6/15.6 23.5/26.0 30/30 22/24 107/107 25.9/28.4 30/30 24/26 109/109
6.5/8.7 18.1/20.9 29.1/32.6 30/35 27/30 107/107 31.5/35.0 35/40 29/32 109/109
7.9/10.5 21.9/25.3 33.9/38.1 35/40 31/35 107/107 36.3/40.5 40/45 33/37 109/109
12.0/16.0 33.4/38.5 48.3/54.6 50/60 44/50 107/107 50.6/57.0 60/60 47/52 109/109
4 6 0 --- 3 --- 6 0
STD
--- --- 10.2 15 10 46 11.2 15 11 47
6.0 7.2 11.6 15 11 46 12.9 15 12 47
8.8 10.6 15.9 20 15 46 17.1 20 16 47
11.5 13.8 19.9 20 18 46 21.1 25 19 47
14.0 16.8 23.6 25 22 46 24.9 25 23 47
MED
--- --- 10.2 15 10 46 11.2 15 11 47
6.0 7.2 11.6 15 11 46 12.9 15 12 47
8.8 10.6 15.9 20 15 46 17.1 20 16 47
11.5 13.8 19.9 20 18 46 21.1 25 19 47
14.0 16.8 23.6 25 22 46 24.9 25 23 47
HIGH
--- --- 10.7 15 11 55 11.7 15 12 56
6.0 7.2 12.3 15 11 55 13.5 15 12 56
8.8 10.6 16.5 20 15 55 17.8 20 16 56
11.5 13.8 20.5 25 19 55 21.8 25 20 56
14.0 16.8 24.3 25 22 55 25.5 30 23 56
5 7 5 --- 3 --- 6 0
STD --- --- 7.3 15 7 44 9.2 15 9 46
MED --- --- 7.3 15 7 44 9.2 15 9 46
HIGH --- --- 7.4 15 7 50 9.3 15 10 52
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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