76
Table 54 – (cont.) MCA/MOCP DETERMINATION W/ PWRD C.O.
UNIT
N O M . V --- P H --- H Z
IFM
TYPE
ELECTRIC HEATER W/PWRD C.O.
Nom*
(kW)
FLA
NO P.E. w/ P.E. (pwrd fr/unit)
MCA MOCP
DISC. SIZE
MCA MOCP
DISC. SIZE
FLA LRA FLA LRA
50TC*A07
208/230---3--- 60
STD
None None 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
None None 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
None None 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
4 6 0 --- 3 --- 6 0
STD
None None 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
None None 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
None None 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
7 5 --- 3 --- 6 0
STD None None 13.6 20 13 65 15.5 20 16 67
MED None None 14.4 20 14 76 16.3 20 17 78
HIGH None None 14.4 20 14 76 16.3 20 17 78
* Nominal valves, listed as 208/240V, 480V or 600V as appropriate.
LEGEND:
C.O. --- 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 . --- P o w e r e x h a u s t
UNPWRD C.O. --- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for multimotor and
combination load 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 cir-
cuit 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 de-
termine the percentage of voltage imbalance.
% Voltage Imbalance = 100 x
max voltage deviation from average voltage
average voltage
Example: Supply 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 imbal-
ance.
% 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 voltage phase imbalance is more than
2%, contact your local electric utility company immediately.
50TC
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