Carrier 50PG20 Installation Instructions Manual page 21

Table 5 — Electrical Data (Units With Optional Convenience Outlet) (cont)
COMPRESSOR
VOLTAGE
NOMINAL
UNIT
RANGE
VOLTAGE
No. 1
SIZE
(3 Ph,
50PG
60 Hz)
Min Max RLA LRA RLA LRA RLA LRA
24
575 518 633 12.8 88
VOLTAGE
NOMINAL
UNIT
RANGE
VOLTAGE
No. 1
SIZE
(3 Ph,
50PG
60 Hz) Min Max RLA LRA RLA LRA RLA LRA Qty
24
208/240 187 253 NA NA
COMPRESSOR
VOLTAGE
NOMINAL
UNIT
RANGE
VOLTAGE
No. 1
SIZE
(3 Ph,
50PG
60 Hz) Min Max RLA LRA RLA LRA RLA LRA Qty
24
208/240 187 253 32.1 240 32.1 240
LEGEND
FLA --- Full Load Amps
HACR --- Heating, Air Conditioning and Refrigeration
IFM --- Indoor (Evaporator) Fan Motor
LRA --- Locked Rotor Amps
MCA
--- Minimum Circuit Amps
MOCP --- Maximum Overcurrent Protection
NEC --- National Electrical Code
OFM --- Outdoor (Condenser) Fan Motor
RLA
--- Rated Load Amps
* Fuse or HACR circuit breaker.
{ 208/230 v 75 ---kW Electric Heat units must use dual---point wiring. The main table lists the
branch circuit values for the refrigeration part of the system. The following two tables list the
branch circuit values for the electric heat and values for a feeder circuit for both branch
circuits.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equip-
ment (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
OFM
No. 2 No. 3
FLA
Qty Hp
(ea)
12.8 88 — — 6 0.25 0.7
Electric Heat Branch Circuit For 208/240-V 75-kW Electric Heat{
COMPRESSOR
OFM
No. 2 No. 3
FLA
Hp
(ea)
NA NA NA NA NA NA NA 56/75 156/180 NA
Feeder Circuit For 208/230-V Unit With 75-kW Electric Heat{
OFM
No. 2 No. 3
FLA
Hp
(ea)
— — 6 0.25 1.5 56/75
max voltage deviation from average voltage
average voltage
ELECTRIC POWER
IFM
HEAT EXHAUST
kW FLA Hp FLA Qty Hp
— —
5 6.1
2 1
— —
— — 7.5 9
2 1
— —
10 11
2 1
— —
5 6.1
2 1
— —
24.8 24 7.5 9
2 1
— —
10 11
2 1
— —
5 6.1
2 1
— —
48.3 46 7.5 9
2 1
— —
10 11
2 1
— —
5 6.1
2 1
— —
78 75 7.5 9
2 1
— —
10 11
2 1
ELECTRIC POWER
IFM
HEAT EXHAUST
FLA
kW FLA Hp FLA Qty Hp
(ea)
NA NA NA NA 156/180 175/200 180/180 200/200
ELECTRIC POWER
IFM
HEAT EXHAUST
kW FLA Hp FLA Qty Hp
— —
3.7 10.6/ 9.6
2 1
— —
5 16.7/15.2
2 1
156/180
— —
7.5 24.2/22
2 1
— —
10 30.8/28
2 1
Example: Supply voltage is 460-3-60
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance
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.
3. The 75-kW 208/240-v electric heat can be factory installed but it must be wired
separately in the field.
4. The convenience outlet full load amps (FLA) are 5, 3 and 3 for 208/230, 460, 575-v
units, respectively.
5. The FLA load amps provided in the table for electric heaters are based on 208/240,
480 and 600 v.
6. MCA calculation for 50PG units with electric heaters over 50 kW is = 1.25 x (IFM +
Power Exhaust + Convenience Outlet FLA amps) + 1.00 x (Electric Heater FLA).
21
POWER SUPPLY
POWER SUPPLY WITH OPTIONAL
HACR BREAKER
FLA
MCA MOCP* MCA MOCP
(ea)
— 42 50 42 50
2.4 47 50 47 50
— 45 50 45 50
2.4 50 60 50 60
— 47 50 47 50
2.4 52 60 52 60
— 42 50 42 50
2.4 47 50 47 50
— 45 50 45 50
2.4 51 60 51 60
— 48 50 48 50
2.4 54 60 54 60
— 69 70 69 70
2.4 75 80 75 80
— 73 80 73 80
2.4 79 80 79 80
— 75 80 75 80
2.4 81 90 81 90
— 86 100 86 100
2.4 92 100 92 100
— 90 100 90 100
2.4 96 100 96 100
— 93 100 93 100
2.4 99 100 99 100
POWER SUPPLY
POWER SUPPLY WITH OPTIONAL
HACR BREAKER
MCA MOCP* MCA MOCP
POWER SUPPLY
POWER SUPPLY WITH OPTIONAL
HACR BREAKER
FLA
MCA MOCP* MCA MOCP
(ea)
— 176/198 200/225 198/198 200/225
5.9 190/213 200/225 213/213 225/225
— 183/205 200/225 205/205 225/225
5.9 198/220 200/225 220/220 225/225
— 193/214 200/225 214/214 225/225
5.9 207/229 225/250 229/229 250/250
— 201/221 225/225 221/221 225/225
216/236
5.9 225/250 236/236 250/250
452 + 464 + 455
3
1371
=
3
=
457
7
= 100 x
457
= 1.53%
DISCONNECT
SIZE
FLA
45
50
48
54
50
56
45
50
48
54
50
56
63
69
67
72
69
75
97
102
100
106
102
108
DISCONNECT
SIZE
FLA
179/207
DISCONNECT
SIZE
FLA
197/224
211/237
204/230
218/244
213/238
227/252
221/245
234/259