Carrier 50JS ÐElectrical Data Legend, ÐControl Connections, ÐLine Power Connections

		LEGEND
FLA	—	Full Load Amps
LRA	—	Locked Rotor Amps	®
MCA	—	Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
RLA	—	Rated Load Amps

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 . The CGA (Canadian Gas Association) 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 in 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.

AB = 452 v BC = 464 v AC = 455 v

Average Voltage = 452 + 464 + 455 3

= 1371

3 = 457

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 = 100 x		7
	457

= 1.53%

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.

C99024

Fig. 15ÐElectrical Data Legend

be in a conduit until they enter the duct panel; conduit termination at the duct panel must be watertight. Run the high-voltage leads through the power entry knockout on the power entry side panel (See Fig. 2 and 3 for location and size). When the leads are inside the unit, run leads up the high-voltage raceway to the line wiring splice box (See Fig. 12 through 14). For single-phase units, connect leads to the black and yellow wires; for 3-phase units, connect the leads to the black, yellow, and blue wires (See Fig. 17).

C

BRN

O

ORN

R

RED

G

	GRN
Y
E	YEL
W2	WHT
THERMOSTAT	UNIT CONTROL POWER
AND SUBBASE	SPLICE BOX

C99056

Fig. 16ÐControl Connections

		GROUND LUG
		(IN SLPICE BOX)
		GROUND
		LEAD
SINGLE-PHASE	L1	BLK
CONNECTIONS
TO DISCONNECT	L2	YEL
PER NEC
3-PHASE	L3	BLU

CONNECTING GROUND LEAD TO GROUND LUG Ð Refer to Fig. 17. Connect the ground lead to the chassis using the ground lug in the wiring splice box.

ROUTING CONTROL POWER WIRES Ð (24 V) Ð Form a drip-loop with the thermostat leads before routing them into the unit. Route the thermostat leads through grommeted, low-voltage hole provided in unit into unit control power splice box (See Fig. 2 and 3). Connect thermostat leads to unit control power leads as shown in Fig. 16.

The unit transformer supplies 24-v power for complete system including accessory electrical heater. An automatic-reset circuit breaker (See Fig. 18) is provided in the 24-v circuit; see the caution label on the transformer or Fig. 19. Transformer is factory wired for 230-v operation. If supply voltage is 208 v, rewire transformer primary as described in Special Procedures for 208-V Operation section.

CONNECTIONS

LEGEND

NOTE: Use copper wire only.

24 V Circuit Breaker

NEC – National Electrical Code

Field Wiring

Splice Connections

Fig. 17ÐLine Power Connections

C99057

24 Volt Compartment

C99070

Fig. 18ÐControl Wiring Plate

14