Carrier 50CR installation instructions Electrical Data Legend

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

NO TES:
1.	In compliance with NEC (National Electrical Code) requirements
	for multimotor and combination load equipment (refer to NE C
	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 break er.
2.	Minimum wire size is based on 60 C copper wire. I f other than
	60 C wire	is used, or	if length exceeds wire length in table,

determine siz e 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

Heater capacity (kW) based on heater voltage of 208v & 240v.

*If power distibution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

EXAMPLE: Supply voltage is 230-3-60.

AB = 228 v BC = 231 v AC = 227 v

Average Voltage = 228 + 231 + 227 3

= 686 3

= 229

Determine maximum deviation from average voltage. (AB) 229 - 228 = 1 v

(BC) 231 - 229 = 2 v

(AC) 229 - 227 = 2 v Maximum deviation is 2 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x		2
	229
= 0.8%

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.

C03014

50CR

Fig. 13 - Electrical Data Legend

User Interface

D

C

B

A

Humidifier (Optional)

24vac C

Infinity Control Board

D

C

B

A

Outdoor Air Thermistor

(if used)

OAT

HUM C W O Y R

LEGEND

Field Control-Voltage Wiring

A05302

Fig. 14 - Control Voltage Wiring Connections

13