Bryant 551J installation instructions Typical Component Location

DISCONNECT	EMT OR RIGID CONDUIT	SINGLE	CENTER	MANUAL RESET
MOUNTING	(FIELD-SUPPLIED)	POINT BOX	POST	LIMIT SWITCH
LOCATION				HEATER
				COVERS

		SINGLE POINT
MAIN	BRACKET AND	BOX	HEATER	HEATER	HEATER
CONTROL CONDUIT		MOUNTING	MODULE	MODULE	MOUNTING
BOX	DRIP BOOT	SCREW	(LOCATION 1) (LOCATION 2) BRACKET

CONTROL WIRE TERMINAL BLOCK

C08134

Fig. 25 - Typical Component Location

551J j

TRACK

FLANGE

C08135

Fig. 26 - Typical Module Installation

Single Point Boxes and Supplementary Fuses — When the unit MOCP device value exceeds 60-A,unit-mounted supplementary fuses are required for each heater circuit. These fuses are included in accessory Single Point Boxes, with power distribution and fuse blocks. The single point box will be installed directly under the unit control box, just to the left of the partition separating the indoor section (with electric heaters) from the outdoor section. The Single Point Box has a hinged access cover. See Fig. 27. The Single Point Box also includes a set of power taps and pigtails to complete the wiring between the Single Point Box and the unit’s main control box terminals. Refer to the accessory heater and Single Point Box installation instructions for details on tap connections.

All fuses on 551J units are 60-A. (Note that all heaters are qualified for use with a 60-A fuse, regardless of actual heater ampacity, so only 60-A fuses are necessary.)

Single Point Boxes without Fuses — Unit heater applications not requiring supplemental fuses require a special Single Point Box without any fuses. The accessory Single Point Boxes contain a set of power taps and pigtails to complete the wiring between the Single Point Box and the unit’s main control box terminals. Refer to accessory heater and Single Point Box installation instructions for details on tap connections.

CONTROL

BOX

BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
	22.2
23	1
	3

HEATER

RELAYS

HEATER

MOUNTING

SCREWS

C08136

Fig. 27 - Typical Single Point Installation

Low-Voltage Control Connections — Pull the low-voltage control leads from the heater module(s) - VIO and BRN (two of each if two modules are installed; identify for Module #1) - to the 4-pole terminal board TB4 located on the heater bulkhead to the left of Heater #1. Connect the VIO lead from Heater #1 to terminal TB4-1. For 2 stage heating, connect the VIO lead from Heater #2 to terminal TB4-2. For 1 stage heating with 2 heater modules connect the VIO lead from both Heater #1 and #2 to terminal TB4-1. Connect both BRN leads to terminal TB4-3. See Fig. 28.

CTB

CONTL

BOARD

2VIO

3ORN

12 BRN

	ORN	VIO	BRN
TB4	1	2	3
	VIO	VIO	BRN BRN

Field

Connections

Elec Htr

VIO HR2 BRN

VIO HR1 BRN

HR1: On Heater 1 in Position #1

HR2: On Heater 2 in Position #2 (if installed)

C08331

Fig. 28 - Accessory Electric Heater Control

Connections

16