Bryant 551J Adjust Factory-Installed Options, EconoMi$er IV Occupancy Switch

Legend and Notes for Table 5

LEGEND:
BRKR	---	Circuit breaker
CO	---	Convenient outlet
DD	---	Direct drive
		indoor fan motor
DISC	---	Disconnect
FLA	---	Full load amps
IFM	---	Indoor fan motor
LRA	---	Locked rotor amps
MCA	---	Minimum circuit amps
PE	---	Power exhaust
PWRD CO	---	Powered convenient outlet
UNPWR CO	---	Unpowered convenient outlet
NOTES:

1.In compliance with NEC requirements for multimotor and combination load equipment (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 de- termine the percentage 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
	3		3

=227

Determine maximum deviation from average voltage.

(AB) 227 – 224 = 3 v . . . . . . . . . . Maximum deviation is 4 v.

(BC) 231 – 227 = 4 v . . . . . . . . . . Determine percent of voltage imbalance.

% Voltage Imbalance	= 100 x	4
		227
	= 1.76%

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%, con- tact your local electric utility company immediately.

551J

j

C09302

Fig. 54 - EconoMi$er IV Wiring

Step 11 — Adjust Factory-Installed Options

Smoke Detectors —

Smoke detector(s) will be connected at the Controls Connections Board, at terminals marked “Smoke Shutdown”. Cut jumper JMP 3 when ready to energize unit.

EconoMi$er IV Occupancy Switch —

Refer to Fig. 56 for general EconoMi$er IV wiring. External occupancy control is managed through a connection on the Controls Connections Board.

If external occupancy control is desired, connect a time clock or remotely controlled switch (closed for Occupied, open for Unoccupied sequence) at terminals marked OCCUPANCY. Cut jumper JMP 2 to complete the installation.

35