Bryant 548J A Series Installation Instructions Manual page 16

Fig. 25 - - 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. 26. 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
TRACK
FLANGE
C08135
DEFROST
BOARD
E-HEAT ORN
P3-3
BRN
ORN
1
TB4
VIO
Field
Connections
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
Fig. 27 - - Accessory Electric Heater Control Connections
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 26 - - Typical Single Point Installation
All fuses on 548J***A 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 — Refer to accessory
heater and Single Point Box installation instructions for
details on tap connections.
Low- - Voltage Control
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 leads from Heater #1 and Heater #2
to terminal TB4- - 1. Connect the BRN leads to terminal
TB4- - 3. See Fig. 27.
BRN
3
VIO BRN BRN
Elec Htr
VIO HR2 BRN
VIO HR1 BRN
16
C08136
Connections — Run
C09013
the