Carrier 50JS Specifications download pdf (Page 16)

LEGEND C@

FLA -- Full Load Amps

LRA -- Locked Rotor Amps II_il_

MCA -- Minimum Circuit Amps

MOCP -- Maximum Overcurrent Protection

RLA -- Rated Load Amps

CKT BKR -- Circuit Breaker

NOTES:

1. In compliance with NEC (National Electrical Code) requirements

for multimotor and combination load equipment (refer to NEC

Articles 430 and 440), the overcurrent protective device for the

unit shall be Power Supply fuse. Canadian units may be

fuse or circuit breaker.

2. Minimum wire size is based on 60 C copper wire. If other than

60 C wire is used, or if length exceeds wire length in table,

determine size from NEC.

3. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance yn supply volt-

age is greater than 2%. Use the following formula to determine

the percentage of voltage imbalance.

% Voltage imbalance

= 100 x max voltage deviation from average voltage

average voltage

EXAMPLE: Supply voltage is 460-3-60.

A B c AB = 452 v

BC = 464 v

AC = 455 v

Average Voltage = 452 + 464 + 455

= 1371

= 457

Determine maximum deviation from average voltage.

(AB) 457 452=5v

(BC) 464 457=7v

(AC) 457 455=2v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x 7

457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the

maximum allowable 2%.

supply voltage phase imbalance is]

IMPORTANT: If the

more than 2%, contact your local electric utility company/

immediately.

C99024

Fig. 16_Electrical Data Legend

THERMOSTAT

AND SUBBASE

"_BRN--

"J_ORN--

J_--_RED--

"J_GRN--

UNIT CONTROL POWER

SPLICE BOX

C99056

Fig. 17--Control Connections

SINGLE-PHASE

CONNECTIONS

TO DISCONNECT

PER NEC

3-PHASE

CONNECTIONS

LEGEND

NEC - National Electrical Code

- - - Field Wiring

_ Splice Connections

GROUND LUG

N SLPICE BOX

GROUND

LEAD

L1 - /L_BLK--

L2 - _-'_ YEL-

L3 - _L-_BLU--

NOTE: Use copper wire onl

C99057

Fig. 18---Line Power Connections

2. Connect the yellow primary lead to the transformer terminal

labeled 200 v.

24 V Circuit Breaker

C99070

Fig. 19_Control Wiring Plate

TRANSFORMER CONTAINS A MANUAL

RESET OVERCURRENT PROTECTOR

IT WILL NOT AUTOMATICALLY RESET

DISCONNECT POWER AND INSTALL

LOCKOUT TAG PRIOR TO SERVICING

THIS COMPARTMENT MUST BE CLOSED

EXCEPT WHEN SERVICING

C99058

Fig. 20_Transformer Label

Indoor blower-motor speeds may need to be changed for 208-v

operation. Refer to indoor airflow and airflow adjustments section.

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Carrier 50JS Specifications Page 16

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