Bryant 548J*14D Single Point Boxes, Typical Component Location, Heater and Supplementary Fuses

SINGLE		HEATER	MANUAL RESET
POINT BOX		COVERS	LIMIT SWITCH
DISCONNECT
MOUNTING
LOCATION
SINGLE POINT	HEATER		HEATER	HEATER
BOX	MODULE		MODULE	MOUNTING
MOUNTING	(LOCATION 1)		(LOCATION 2)	BRACKET
SCREW

C10029

Fig. 29 - Typical Component Location

548J*14D

Single Point Boxes

When heaters are installed, power wiring to both heaters and the rest of the unit is connected via the single point box accessory, which 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. 29. The single point box also includes 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.

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

Heater 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.

All fuses on 548J 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.)

Heater Low-Voltage Control Connections —

One or two heaters can be installed in the unit. Use the wiring procedure listed below for each heater as determined by the number of stages in the heater.

Single Stage Heaters: Single-stage heaters will have an orange and a brown control wire. Connect these to the orange and brown wires located on TB4.

Two Stage Heaters: Two-stage heaters will have orange, purple, red and brown wires. The orange and the purple are the control wires and the red and brown wires feed the safety circuit. Connect both the orange and the purple wires to the orange wire locations of TB4. Connect the red and brown wires to red and brown wires on TB4. If more than one heater is installed, repeat the wiring procedure for the second heater. The 3 locations across the top of TB4 do allow a switch to be installed in series with some of the heaters in order to add additional heater control.

Fig. 30 - Typical Single Point Installation

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