Carrier 50TCQD Specifications download pdf (Page 52)

APPENDIX IV. ELECTRICAL INFORMATION (cont.)

Legend and Notes for Tables 48 through 52

LEGEND:

CO --- 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

UNPWR CO --- Unpowered convenient outlet

NOTES:

1. Over Current Protection

In compliance with NEC requirements for multimotor and

combination load equipment (refer to NEC Articles 430 and

440), the over current protective device for the unit shall use

a fuse or a HACR breaker. Canadian units shall use a fuse or

a 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 de-

termine the p ercentage 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

= 227

Determine maximum deviation from average voltage.

(AB) 227 – 224 = 3 v

(BC) 231 – 227 = 4 v

(AC) 227 – 226 = 1 v

Maximum deviation is 4 v.

Determine p ercent of voltage imbalance.

% Voltage Imbalance = 100 x

227

= 1.76%

This amount of phase imbalance is satisfactory as it is b elow the

maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than

2%, contact your local electric utility company immediately.

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Carrier 50TCQD Specifications Page 52

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